text: /***************************************************************************/
  /*                                                                         */
  /*  freetype.h                                                             */
  /*                                                                         */
  /*    FreeType high-level API and common types (specification only).       */
  /*                                                                         */
  /*  Copyright 1996-2018 by                                                 */
  /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  /*                                                                         */
  /*  This file is part of the FreeType project, and may only be used,       */
  /*  modified, and distributed under the terms of the FreeType project      */
  /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  /*  this file you indicate that you have read the license and              */
  /*  understand and accept it fully.                                        */
  /*                                                                         */
  /***************************************************************************/
  
  
  #ifndef FREETYPE_H_
  #define FREETYPE_H_
  
  
  #ifndef FT_FREETYPE_H
  #error "`ft2build.h' hasn't been included yet!"
  #error "Please always use macros to include FreeType header files."
  #error "Example:"
  #error "  #include <ft2build.h>"
  #error "  #include FT_FREETYPE_H"
  #endif
  
  
  #include <ft2build.h>
  #include FT_CONFIG_CONFIG_H
  #include FT_TYPES_H
  #include FT_ERRORS_H
  
  
  FT_BEGIN_HEADER
  
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Section>                                                             */
    /*    header_inclusion                                                   */
    /*                                                                       */
    /* <Title>                                                               */
    /*    FreeType's header inclusion scheme                                 */
    /*                                                                       */
    /* <Abstract>                                                            */
    /*    How client applications should include FreeType header files.      */
    /*                                                                       */
    /* <Description>                                                         */
    /*    To be as flexible as possible (and for historical reasons),        */
    /*    FreeType uses a very special inclusion scheme to load header       */
    /*    files, for example                                                 */
    /*                                                                       */
    /*    {                                                                  */
    /*      #include <ft2build.h>                                            */
    /*                                                                       */
    /*      #include FT_FREETYPE_H                                           */
    /*      #include FT_OUTLINE_H                                            */
    /*    }                                                                  */
    /*                                                                       */
    /*    A compiler and its preprocessor only needs an include path to find */
    /*    the file `ft2build.h'; the exact locations and names of the other  */
    /*    FreeType header files are hidden by preprocessor macro names,      */
    /*    loaded by `ft2build.h'.  The API documentation always gives the    */
    /*    header macro name needed for a particular function.                */
    /*                                                                       */
    /*************************************************************************/
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Section>                                                             */
    /*    user_allocation                                                    */
    /*                                                                       */
    /* <Title>                                                               */
    /*    User allocation                                                    */
    /*                                                                       */
    /* <Abstract>                                                            */
    /*    How client applications should allocate FreeType data structures.  */
    /*                                                                       */
    /* <Description>                                                         */
    /*    FreeType assumes that structures allocated by the user and passed  */
    /*    as arguments are zeroed out except for the actual data.  In other  */
    /*    words, it is recommended to use `calloc' (or variants of it)       */
    /*    instead of `malloc' for allocation.                                */
    /*                                                                       */
    /*************************************************************************/
  
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*                                                                       */
    /*                        B A S I C   T Y P E S                          */
    /*                                                                       */
    /*************************************************************************/
    /*************************************************************************/
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Section>                                                             */
    /*    base_interface                                                     */
    /*                                                                       */
    /* <Title>                                                               */
    /*    Base Interface                                                     */
    /*                                                                       */
    /* <Abstract>                                                            */
    /*    The FreeType~2 base font interface.                                */
    /*                                                                       */
    /* <Description>                                                         */
    /*    This section describes the most important public high-level API    */
    /*    functions of FreeType~2.                                           */
    /*                                                                       */
    /* <Order>                                                               */
    /*    FT_Library                                                         */
    /*    FT_Face                                                            */
    /*    FT_Size                                                            */
    /*    FT_GlyphSlot                                                       */
    /*    FT_CharMap                                                         */
    /*    FT_Encoding                                                        */
    /*    FT_ENC_TAG                                                         */
    /*                                                                       */
    /*    FT_FaceRec                                                         */
    /*                                                                       */
    /*    FT_FACE_FLAG_SCALABLE                                              */
    /*    FT_FACE_FLAG_FIXED_SIZES                                           */
    /*    FT_FACE_FLAG_FIXED_WIDTH                                           */
    /*    FT_FACE_FLAG_HORIZONTAL                                            */
    /*    FT_FACE_FLAG_VERTICAL                                              */
    /*    FT_FACE_FLAG_COLOR                                                 */
    /*    FT_FACE_FLAG_SFNT                                                  */
    /*    FT_FACE_FLAG_CID_KEYED                                             */
    /*    FT_FACE_FLAG_TRICKY                                                */
    /*    FT_FACE_FLAG_KERNING                                               */
    /*    FT_FACE_FLAG_MULTIPLE_MASTERS                                      */
    /*    FT_FACE_FLAG_VARIATION                                             */
    /*    FT_FACE_FLAG_GLYPH_NAMES                                           */
    /*    FT_FACE_FLAG_EXTERNAL_STREAM                                       */
    /*    FT_FACE_FLAG_HINTER                                                */
    /*                                                                       */
    /*    FT_HAS_HORIZONTAL                                                  */
    /*    FT_HAS_VERTICAL                                                    */
    /*    FT_HAS_KERNING                                                     */
    /*    FT_HAS_FIXED_SIZES                                                 */
    /*    FT_HAS_GLYPH_NAMES                                                 */
    /*    FT_HAS_COLOR                                                       */
    /*    FT_HAS_MULTIPLE_MASTERS                                            */
    /*                                                                       */
    /*    FT_IS_SFNT                                                         */
    /*    FT_IS_SCALABLE                                                     */
    /*    FT_IS_FIXED_WIDTH                                                  */
    /*    FT_IS_CID_KEYED                                                    */
    /*    FT_IS_TRICKY                                                       */
    /*    FT_IS_NAMED_INSTANCE                                               */
    /*    FT_IS_VARIATION                                                    */
    /*                                                                       */
    /*    FT_STYLE_FLAG_BOLD                                                 */
    /*    FT_STYLE_FLAG_ITALIC                                               */
    /*                                                                       */
    /*    FT_SizeRec                                                         */
    /*    FT_Size_Metrics                                                    */
    /*                                                                       */
    /*    FT_GlyphSlotRec                                                    */
    /*    FT_Glyph_Metrics                                                   */
    /*    FT_SubGlyph                                                        */
    /*                                                                       */
    /*    FT_Bitmap_Size                                                     */
    /*                                                                       */
    /*    FT_Init_FreeType                                                   */
    /*    FT_Done_FreeType                                                   */
    /*                                                                       */
    /*    FT_New_Face                                                        */
    /*    FT_Done_Face                                                       */
    /*    FT_Reference_Face                                                  */
    /*    FT_New_Memory_Face                                                 */
    /*    FT_Face_Properties                                                 */
    /*    FT_Open_Face                                                       */
    /*    FT_Open_Args                                                       */
    /*    FT_Parameter                                                       */
    /*    FT_Attach_File                                                     */
    /*    FT_Attach_Stream                                                   */
    /*                                                                       */
    /*    FT_Set_Char_Size                                                   */
    /*    FT_Set_Pixel_Sizes                                                 */
    /*    FT_Request_Size                                                    */
    /*    FT_Select_Size                                                     */
    /*    FT_Size_Request_Type                                               */
    /*    FT_Size_RequestRec                                                 */
    /*    FT_Size_Request                                                    */
    /*    FT_Set_Transform                                                   */
    /*    FT_Load_Glyph                                                      */
    /*    FT_Get_Char_Index                                                  */
    /*    FT_Get_First_Char                                                  */
    /*    FT_Get_Next_Char                                                   */
    /*    FT_Get_Name_Index                                                  */
    /*    FT_Load_Char                                                       */
    /*                                                                       */
    /*    FT_OPEN_MEMORY                                                     */
    /*    FT_OPEN_STREAM                                                     */
    /*    FT_OPEN_PATHNAME                                                   */
    /*    FT_OPEN_DRIVER                                                     */
    /*    FT_OPEN_PARAMS                                                     */
    /*                                                                       */
    /*    FT_LOAD_DEFAULT                                                    */
    /*    FT_LOAD_RENDER                                                     */
    /*    FT_LOAD_MONOCHROME                                                 */
    /*    FT_LOAD_LINEAR_DESIGN                                              */
    /*    FT_LOAD_NO_SCALE                                                   */
    /*    FT_LOAD_NO_HINTING                                                 */
    /*    FT_LOAD_NO_BITMAP                                                  */
    /*    FT_LOAD_NO_AUTOHINT                                                */
    /*    FT_LOAD_COLOR                                                      */
    /*                                                                       */
    /*    FT_LOAD_VERTICAL_LAYOUT                                            */
    /*    FT_LOAD_IGNORE_TRANSFORM                                           */
    /*    FT_LOAD_FORCE_AUTOHINT                                             */
    /*    FT_LOAD_NO_RECURSE                                                 */
    /*    FT_LOAD_PEDANTIC                                                   */
    /*                                                                       */
    /*    FT_LOAD_TARGET_NORMAL                                              */
    /*    FT_LOAD_TARGET_LIGHT                                               */
    /*    FT_LOAD_TARGET_MONO                                                */
    /*    FT_LOAD_TARGET_LCD                                                 */
    /*    FT_LOAD_TARGET_LCD_V                                               */
    /*                                                                       */
    /*    FT_LOAD_TARGET_MODE                                                */
    /*                                                                       */
    /*    FT_Render_Glyph                                                    */
    /*    FT_Render_Mode                                                     */
    /*    FT_Get_Kerning                                                     */
    /*    FT_Kerning_Mode                                                    */
    /*    FT_Get_Track_Kerning                                               */
    /*    FT_Get_Glyph_Name                                                  */
    /*    FT_Get_Postscript_Name                                             */
    /*                                                                       */
    /*    FT_CharMapRec                                                      */
    /*    FT_Select_Charmap                                                  */
    /*    FT_Set_Charmap                                                     */
    /*    FT_Get_Charmap_Index                                               */
    /*                                                                       */
    /*    FT_Get_FSType_Flags                                                */
    /*    FT_Get_SubGlyph_Info                                               */
    /*                                                                       */
    /*    FT_Face_Internal                                                   */
    /*    FT_Size_Internal                                                   */
    /*    FT_Slot_Internal                                                   */
    /*                                                                       */
    /*    FT_FACE_FLAG_XXX                                                   */
    /*    FT_STYLE_FLAG_XXX                                                  */
    /*    FT_OPEN_XXX                                                        */
    /*    FT_LOAD_XXX                                                        */
    /*    FT_LOAD_TARGET_XXX                                                 */
    /*    FT_SUBGLYPH_FLAG_XXX                                               */
    /*    FT_FSTYPE_XXX                                                      */
    /*                                                                       */
    /*    FT_HAS_FAST_GLYPHS                                                 */
    /*                                                                       */
    /*************************************************************************/
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Struct>                                                              */
    /*    FT_Glyph_Metrics                                                   */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A structure to model the metrics of a single glyph.  The values    */
    /*    are expressed in 26.6 fractional pixel format; if the flag         */
    /*    @FT_LOAD_NO_SCALE has been used while loading the glyph, values    */
    /*    are expressed in font units instead.                               */
    /*                                                                       */
    /* <Fields>                                                              */
    /*    width ::                                                           */
    /*      The glyph's width.                                               */
    /*                                                                       */
    /*    height ::                                                          */
    /*      The glyph's height.                                              */
    /*                                                                       */
    /*    horiBearingX ::                                                    */
    /*      Left side bearing for horizontal layout.                         */
    /*                                                                       */
    /*    horiBearingY ::                                                    */
    /*      Top side bearing for horizontal layout.                          */
    /*                                                                       */
    /*    horiAdvance ::                                                     */
    /*      Advance width for horizontal layout.                             */
    /*                                                                       */
    /*    vertBearingX ::                                                    */
    /*      Left side bearing for vertical layout.                           */
    /*                                                                       */
    /*    vertBearingY ::                                                    */
    /*      Top side bearing for vertical layout.  Larger positive values    */
    /*      mean further below the vertical glyph origin.                    */
    /*                                                                       */
    /*    vertAdvance ::                                                     */
    /*      Advance height for vertical layout.  Positive values mean the    */
    /*      glyph has a positive advance downward.                           */
    /*                                                                       */
    /* <Note>                                                                */
    /*    If not disabled with @FT_LOAD_NO_HINTING, the values represent     */
    /*    dimensions of the hinted glyph (in case hinting is applicable).    */
    /*                                                                       */
    /*    Stroking a glyph with an outside border does not increase          */
    /*    `horiAdvance' or `vertAdvance'; you have to manually adjust these  */
    /*    values to account for the added width and height.                  */
    /*                                                                       */
    /*    FreeType doesn't use the `VORG' table data for CFF fonts because   */
    /*    it doesn't have an interface to quickly retrieve the glyph height. */
    /*    The y~coordinate of the vertical origin can be simply computed as  */
    /*    `vertBearingY + height' after loading a glyph.                     */
    /*                                                                       */
    typedef struct  FT_Glyph_Metrics_
    {
      FT_Pos  width;
      FT_Pos  height;
  
      FT_Pos  horiBearingX;
      FT_Pos  horiBearingY;
      FT_Pos  horiAdvance;
  
      FT_Pos  vertBearingX;
      FT_Pos  vertBearingY;
      FT_Pos  vertAdvance;
  
    } FT_Glyph_Metrics;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Struct>                                                              */
    /*    FT_Bitmap_Size                                                     */
    /*                                                                       */
    /* <Description>                                                         */
    /*    This structure models the metrics of a bitmap strike (i.e., a set  */
    /*    of glyphs for a given point size and resolution) in a bitmap font. */
    /*    It is used for the `available_sizes' field of @FT_Face.            */
    /*                                                                       */
    /* <Fields>                                                              */
    /*    height :: The vertical distance, in pixels, between two            */
    /*              consecutive baselines.  It is always positive.           */
    /*                                                                       */
    /*    width  :: The average width, in pixels, of all glyphs in the       */
    /*              strike.                                                  */
    /*                                                                       */
    /*    size   :: The nominal size of the strike in 26.6 fractional        */
    /*              points.  This field is not very useful.                  */
    /*                                                                       */
    /*    x_ppem :: The horizontal ppem (nominal width) in 26.6 fractional   */
    /*              pixels.                                                  */
    /*                                                                       */
    /*    y_ppem :: The vertical ppem (nominal height) in 26.6 fractional    */
    /*              pixels.                                                  */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Windows FNT:                                                       */
    /*      The nominal size given in a FNT font is not reliable.  If the    */
    /*      driver finds it incorrect, it sets `size' to some calculated     */
    /*      values, and `x_ppem' and `y_ppem' to the pixel width and height  */
    /*      given in the font, respectively.                                 */
    /*                                                                       */
    /*    TrueType embedded bitmaps:                                         */
    /*      `size', `width', and `height' values are not contained in the    */
    /*      bitmap strike itself.  They are computed from the global font    */
    /*      parameters.                                                      */
    /*                                                                       */
    typedef struct  FT_Bitmap_Size_
    {
      FT_Short  height;
      FT_Short  width;
  
      FT_Pos    size;
  
      FT_Pos    x_ppem;
      FT_Pos    y_ppem;
  
    } FT_Bitmap_Size;
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*                                                                       */
    /*                     O B J E C T   C L A S S E S                       */
    /*                                                                       */
    /*************************************************************************/
    /*************************************************************************/
  
    /*************************************************************************/
    /*                                                                       */
    /* <Type>                                                                */
    /*    FT_Library                                                         */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A handle to a FreeType library instance.  Each `library' is        */
    /*    completely independent from the others; it is the `root' of a set  */
    /*    of objects like fonts, faces, sizes, etc.                          */
    /*                                                                       */
    /*    It also embeds a memory manager (see @FT_Memory), as well as a     */
    /*    scan-line converter object (see @FT_Raster).                       */
    /*                                                                       */
    /*    In multi-threaded applications it is easiest to use one            */
    /*    `FT_Library' object per thread.  In case this is too cumbersome,   */
    /*    a single `FT_Library' object across threads is possible also       */
    /*    (since FreeType version 2.5.6), as long as a mutex lock is used    */
    /*    around @FT_New_Face and @FT_Done_Face.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Library objects are normally created by @FT_Init_FreeType, and     */
    /*    destroyed with @FT_Done_FreeType.  If you need reference-counting  */
    /*    (cf. @FT_Reference_Library), use @FT_New_Library and               */
    /*    @FT_Done_Library.                                                  */
    /*                                                                       */
    typedef struct FT_LibraryRec_  *FT_Library;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Section>                                                             */
    /*    module_management                                                  */
    /*                                                                       */
    /*************************************************************************/
  
    /*************************************************************************/
    /*                                                                       */
    /* <Type>                                                                */
    /*    FT_Module                                                          */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A handle to a given FreeType module object.  A module can be a     */
    /*    font driver, a renderer, or anything else that provides services   */
    /*    to the former.                                                     */
    /*                                                                       */
    typedef struct FT_ModuleRec_*  FT_Module;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Type>                                                                */
    /*    FT_Driver                                                          */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A handle to a given FreeType font driver object.  A font driver    */
    /*    is a module capable of creating faces from font files.             */
    /*                                                                       */
    typedef struct FT_DriverRec_*  FT_Driver;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Type>                                                                */
    /*    FT_Renderer                                                        */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A handle to a given FreeType renderer.  A renderer is a module in  */
    /*    charge of converting a glyph's outline image to a bitmap.  It      */
    /*    supports a single glyph image format, and one or more target       */
    /*    surface depths.                                                    */
    /*                                                                       */
    typedef struct FT_RendererRec_*  FT_Renderer;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Section>                                                             */
    /*    base_interface                                                     */
    /*                                                                       */
    /*************************************************************************/
  
    /*************************************************************************/
    /*                                                                       */
    /* <Type>                                                                */
    /*    FT_Face                                                            */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A handle to a typographic face object.  A face object models a     */
    /*    given typeface, in a given style.                                  */
    /*                                                                       */
    /* <Note>                                                                */
    /*    A face object also owns a single @FT_GlyphSlot object, as well     */
    /*    as one or more @FT_Size objects.                                   */
    /*                                                                       */
    /*    Use @FT_New_Face or @FT_Open_Face to create a new face object from */
    /*    a given filepath or a custom input stream.                         */
    /*                                                                       */
    /*    Use @FT_Done_Face to destroy it (along with its slot and sizes).   */
    /*                                                                       */
    /*    An `FT_Face' object can only be safely used from one thread at a   */
    /*    time.  Similarly, creation and destruction of `FT_Face' with the   */
    /*    same @FT_Library object can only be done from one thread at a      */
    /*    time.  On the other hand, functions like @FT_Load_Glyph and its    */
    /*    siblings are thread-safe and do not need the lock to be held as    */
    /*    long as the same `FT_Face' object is not used from multiple        */
    /*    threads at the same time.                                          */
    /*                                                                       */
    /* <Also>                                                                */
    /*    See @FT_FaceRec for the publicly accessible fields of a given face */
    /*    object.                                                            */
    /*                                                                       */
    typedef struct FT_FaceRec_*  FT_Face;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Type>                                                                */
    /*    FT_Size                                                            */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A handle to an object that models a face scaled to a given         */
    /*    character size.                                                    */
    /*                                                                       */
    /* <Note>                                                                */
    /*    An @FT_Face has one _active_ @FT_Size object that is used by       */
    /*    functions like @FT_Load_Glyph to determine the scaling             */
    /*    transformation that in turn is used to load and hint glyphs and    */
    /*    metrics.                                                           */
    /*                                                                       */
    /*    You can use @FT_Set_Char_Size, @FT_Set_Pixel_Sizes,                */
    /*    @FT_Request_Size or even @FT_Select_Size to change the content     */
    /*    (i.e., the scaling values) of the active @FT_Size.                 */
    /*                                                                       */
    /*    You can use @FT_New_Size to create additional size objects for a   */
    /*    given @FT_Face, but they won't be used by other functions until    */
    /*    you activate it through @FT_Activate_Size.  Only one size can be   */
    /*    activated at any given time per face.                              */
    /*                                                                       */
    /* <Also>                                                                */
    /*    See @FT_SizeRec for the publicly accessible fields of a given size */
    /*    object.                                                            */
    /*                                                                       */
    typedef struct FT_SizeRec_*  FT_Size;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Type>                                                                */
    /*    FT_GlyphSlot                                                       */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A handle to a given `glyph slot'.  A slot is a container that can  */
    /*    hold any of the glyphs contained in its parent face.               */
    /*                                                                       */
    /*    In other words, each time you call @FT_Load_Glyph or               */
    /*    @FT_Load_Char, the slot's content is erased by the new glyph data, */
    /*    i.e., the glyph's metrics, its image (bitmap or outline), and      */
    /*    other control information.                                         */
    /*                                                                       */
    /* <Also>                                                                */
    /*    See @FT_GlyphSlotRec for the publicly accessible glyph fields.     */
    /*                                                                       */
    typedef struct FT_GlyphSlotRec_*  FT_GlyphSlot;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Type>                                                                */
    /*    FT_CharMap                                                         */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A handle to a character map (usually abbreviated to `charmap').  A */
    /*    charmap is used to translate character codes in a given encoding   */
    /*    into glyph indexes for its parent's face.  Some font formats may   */
    /*    provide several charmaps per font.                                 */
    /*                                                                       */
    /*    Each face object owns zero or more charmaps, but only one of them  */
    /*    can be `active', providing the data used by @FT_Get_Char_Index or  */
    /*    @FT_Load_Char.                                                     */
    /*                                                                       */
    /*    The list of available charmaps in a face is available through the  */
    /*    `face->num_charmaps' and `face->charmaps' fields of @FT_FaceRec.   */
    /*                                                                       */
    /*    The currently active charmap is available as `face->charmap'.      */
    /*    You should call @FT_Set_Charmap to change it.                      */
    /*                                                                       */
    /* <Note>                                                                */
    /*    When a new face is created (either through @FT_New_Face or         */
    /*    @FT_Open_Face), the library looks for a Unicode charmap within     */
    /*    the list and automatically activates it.  If there is no Unicode   */
    /*    charmap, FreeType doesn't set an `active' charmap.                 */
    /*                                                                       */
    /* <Also>                                                                */
    /*    See @FT_CharMapRec for the publicly accessible fields of a given   */
    /*    character map.                                                     */
    /*                                                                       */
    typedef struct FT_CharMapRec_*  FT_CharMap;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Macro>                                                               */
    /*    FT_ENC_TAG                                                         */
    /*                                                                       */
    /* <Description>                                                         */
    /*    This macro converts four-letter tags into an unsigned long.  It is */
    /*    used to define `encoding' identifiers (see @FT_Encoding).          */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Since many 16-bit compilers don't like 32-bit enumerations, you    */
    /*    should redefine this macro in case of problems to something like   */
    /*    this:                                                              */
    /*                                                                       */
    /*    {                                                                  */
    /*      #define FT_ENC_TAG( value, a, b, c, d )  value                   */
    /*    }                                                                  */
    /*                                                                       */
    /*    to get a simple enumeration without assigning special numbers.     */
    /*                                                                       */
  
  #ifndef FT_ENC_TAG
  #define FT_ENC_TAG( value, a, b, c, d )         \
            value = ( ( (FT_UInt32)(a) << 24 ) |  \
                      ( (FT_UInt32)(b) << 16 ) |  \
                      ( (FT_UInt32)(c) <<  8 ) |  \
                        (FT_UInt32)(d)         )
  
  #endif /* FT_ENC_TAG */
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Enum>                                                                */
    /*    FT_Encoding                                                        */
    /*                                                                       */
    /* <Description>                                                         */
    /*    An enumeration to specify character sets supported by charmaps.    */
    /*    Used in the @FT_Select_Charmap API function.                       */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Despite the name, this enumeration lists specific character        */
    /*    repertories (i.e., charsets), and not text encoding methods (e.g., */
    /*    UTF-8, UTF-16, etc.).                                              */
    /*                                                                       */
    /*    Other encodings might be defined in the future.                    */
    /*                                                                       */
    /* <Values>                                                              */
    /*    FT_ENCODING_NONE ::                                                */
    /*      The encoding value~0 is reserved.                                */
    /*                                                                       */
    /*    FT_ENCODING_UNICODE ::                                             */
    /*      The Unicode character set.  This value covers all versions of    */
    /*      the Unicode repertoire, including ASCII and Latin-1.  Most fonts */
    /*      include a Unicode charmap, but not all of them.                  */
    /*                                                                       */
    /*      For example, if you want to access Unicode value U+1F028 (and    */
    /*      the font contains it), use value 0x1F028 as the input value for  */
    /*      @FT_Get_Char_Index.                                              */
    /*                                                                       */
    /*    FT_ENCODING_MS_SYMBOL ::                                           */
    /*      Microsoft Symbol encoding, used to encode mathematical symbols   */
    /*      and wingdings.  For more information, see                        */
    /*      `https://www.microsoft.com/typography/otspec/recom.htm',         */
    /*      `http://www.kostis.net/charsets/symbol.htm', and                 */
    /*      `http://www.kostis.net/charsets/wingding.htm'.                   */
    /*                                                                       */
    /*      This encoding uses character codes from the PUA (Private Unicode */
    /*      Area) in the range U+F020-U+F0FF.                                */
    /*                                                                       */
    /*    FT_ENCODING_SJIS ::                                                */
    /*      Shift JIS encoding for Japanese.  More info at                   */
    /*      `https://en.wikipedia.org/wiki/Shift_JIS'.  See note on          */
    /*      multi-byte encodings below.                                      */
    /*                                                                       */
    /*    FT_ENCODING_PRC ::                                                 */
    /*      Corresponds to encoding systems mainly for Simplified Chinese as */
    /*      used in People's Republic of China (PRC).  The encoding layout   */
    /*      is based on GB~2312 and its supersets GBK and GB~18030.          */
    /*                                                                       */
    /*    FT_ENCODING_BIG5 ::                                                */
    /*      Corresponds to an encoding system for Traditional Chinese as     */
    /*      used in Taiwan and Hong Kong.                                    */
    /*                                                                       */
    /*    FT_ENCODING_WANSUNG ::                                             */
    /*      Corresponds to the Korean encoding system known as Extended      */
    /*      Wansung (MS Windows code page 949).                              */
    /*      For more information see                                         */
    /*      `https://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WindowsBestFit/bestfit949.txt'. */
    /*                                                                       */
    /*    FT_ENCODING_JOHAB ::                                               */
    /*      The Korean standard character set (KS~C 5601-1992), which        */
    /*      corresponds to MS Windows code page 1361.  This character set    */
    /*      includes all possible Hangul character combinations.             */
    /*                                                                       */
    /*    FT_ENCODING_ADOBE_LATIN_1 ::                                       */
    /*      Corresponds to a Latin-1 encoding as defined in a Type~1         */
    /*      PostScript font.  It is limited to 256 character codes.          */
    /*                                                                       */
    /*    FT_ENCODING_ADOBE_STANDARD ::                                      */
    /*      Adobe Standard encoding, as found in Type~1, CFF, and            */
    /*      OpenType/CFF fonts.  It is limited to 256 character codes.       */
    /*                                                                       */
    /*    FT_ENCODING_ADOBE_EXPERT ::                                        */
    /*      Adobe Expert encoding, as found in Type~1, CFF, and OpenType/CFF */
    /*      fonts.  It is limited to 256 character codes.                    */
    /*                                                                       */
    /*    FT_ENCODING_ADOBE_CUSTOM ::                                        */
    /*      Corresponds to a custom encoding, as found in Type~1, CFF, and   */
    /*      OpenType/CFF fonts.  It is limited to 256 character codes.       */
    /*                                                                       */
    /*    FT_ENCODING_APPLE_ROMAN ::                                         */
    /*      Apple roman encoding.  Many TrueType and OpenType fonts contain  */
    /*      a charmap for this 8-bit encoding, since older versions of Mac   */
    /*      OS are able to use it.                                           */
    /*                                                                       */
    /*    FT_ENCODING_OLD_LATIN_2 ::                                         */
    /*      This value is deprecated and was neither used nor reported by    */
    /*      FreeType.  Don't use or test for it.                             */
    /*                                                                       */
    /*    FT_ENCODING_MS_SJIS ::                                             */
    /*      Same as FT_ENCODING_SJIS.  Deprecated.                           */
    /*                                                                       */
    /*    FT_ENCODING_MS_GB2312 ::                                           */
    /*      Same as FT_ENCODING_PRC.  Deprecated.                            */
    /*                                                                       */
    /*    FT_ENCODING_MS_BIG5 ::                                             */
    /*      Same as FT_ENCODING_BIG5.  Deprecated.                           */
    /*                                                                       */
    /*    FT_ENCODING_MS_WANSUNG ::                                          */
    /*      Same as FT_ENCODING_WANSUNG.  Deprecated.                        */
    /*                                                                       */
    /*    FT_ENCODING_MS_JOHAB ::                                            */
    /*      Same as FT_ENCODING_JOHAB.  Deprecated.                          */
    /*                                                                       */
    /* <Note>                                                                */
    /*    By default, FreeType enables a Unicode charmap and tags it with    */
    /*    FT_ENCODING_UNICODE when it is either provided or can be generated */
    /*    from PostScript glyph name dictionaries in the font file.          */
    /*    All other encodings are considered legacy and tagged only if       */
    /*    explicitly defined in the font file.  Otherwise, FT_ENCODING_NONE  */
    /*    is used.                                                           */
    /*                                                                       */
    /*    FT_ENCODING_NONE is set by the BDF and PCF drivers if the charmap  */
    /*    is neither Unicode nor ISO-8859-1 (otherwise it is set to          */
    /*    FT_ENCODING_UNICODE).  Use @FT_Get_BDF_Charset_ID to find out      */
    /*    which encoding is really present.  If, for example, the            */
    /*    `cs_registry' field is `KOI8' and the `cs_encoding' field is `R',  */
    /*    the font is encoded in KOI8-R.                                     */
    /*                                                                       */
    /*    FT_ENCODING_NONE is always set (with a single exception) by the    */
    /*    winfonts driver.  Use @FT_Get_WinFNT_Header and examine the        */
    /*    `charset' field of the @FT_WinFNT_HeaderRec structure to find out  */
    /*    which encoding is really present.  For example,                    */
    /*    @FT_WinFNT_ID_CP1251 (204) means Windows code page 1251 (for       */
    /*    Russian).                                                          */
    /*                                                                       */
    /*    FT_ENCODING_NONE is set if `platform_id' is @TT_PLATFORM_MACINTOSH */
    /*    and `encoding_id' is not `TT_MAC_ID_ROMAN' (otherwise it is set to */
    /*    FT_ENCODING_APPLE_ROMAN).                                          */
    /*                                                                       */
    /*    If `platform_id' is @TT_PLATFORM_MACINTOSH, use the function       */
    /*    @FT_Get_CMap_Language_ID to query the Mac language ID that may     */
    /*    be needed to be able to distinguish Apple encoding variants.  See  */
    /*                                                                       */
    /*      https://www.unicode.org/Public/MAPPINGS/VENDORS/APPLE/Readme.txt */
    /*                                                                       */
    /*    to get an idea how to do that.  Basically, if the language ID      */
    /*    is~0, don't use it, otherwise subtract 1 from the language ID.     */
    /*    Then examine `encoding_id'.  If, for example, `encoding_id' is     */
    /*    `TT_MAC_ID_ROMAN' and the language ID (minus~1) is                 */
    /*    `TT_MAC_LANGID_GREEK', it is the Greek encoding, not Roman.        */
    /*    `TT_MAC_ID_ARABIC' with `TT_MAC_LANGID_FARSI' means the Farsi      */
    /*    variant the Arabic encoding.                                       */
    /*                                                                       */
    typedef enum  FT_Encoding_
    {
      FT_ENC_TAG( FT_ENCODING_NONE, 0, 0, 0, 0 ),
  
      FT_ENC_TAG( FT_ENCODING_MS_SYMBOL, 's', 'y', 'm', 'b' ),
      FT_ENC_TAG( FT_ENCODING_UNICODE,   'u', 'n', 'i', 'c' ),
  
      FT_ENC_TAG( FT_ENCODING_SJIS,    's', 'j', 'i', 's' ),
      FT_ENC_TAG( FT_ENCODING_PRC,     'g', 'b', ' ', ' ' ),
      FT_ENC_TAG( FT_ENCODING_BIG5,    'b', 'i', 'g', '5' ),
      FT_ENC_TAG( FT_ENCODING_WANSUNG, 'w', 'a', 'n', 's' ),
      FT_ENC_TAG( FT_ENCODING_JOHAB,   'j', 'o', 'h', 'a' ),
  
      /* for backward compatibility */
      FT_ENCODING_GB2312     = FT_ENCODING_PRC,
      FT_ENCODING_MS_SJIS    = FT_ENCODING_SJIS,
      FT_ENCODING_MS_GB2312  = FT_ENCODING_PRC,
      FT_ENCODING_MS_BIG5    = FT_ENCODING_BIG5,
      FT_ENCODING_MS_WANSUNG = FT_ENCODING_WANSUNG,
      FT_ENCODING_MS_JOHAB   = FT_ENCODING_JOHAB,
  
      FT_ENC_TAG( FT_ENCODING_ADOBE_STANDARD, 'A', 'D', 'O', 'B' ),
      FT_ENC_TAG( FT_ENCODING_ADOBE_EXPERT,   'A', 'D', 'B', 'E' ),
      FT_ENC_TAG( FT_ENCODING_ADOBE_CUSTOM,   'A', 'D', 'B', 'C' ),
      FT_ENC_TAG( FT_ENCODING_ADOBE_LATIN_1,  'l', 'a', 't', '1' ),
  
      FT_ENC_TAG( FT_ENCODING_OLD_LATIN_2, 'l', 'a', 't', '2' ),
  
      FT_ENC_TAG( FT_ENCODING_APPLE_ROMAN, 'a', 'r', 'm', 'n' )
  
    } FT_Encoding;
  
  
    /* these constants are deprecated; use the corresponding `FT_Encoding' */
    /* values instead                                                      */
  #define ft_encoding_none            FT_ENCODING_NONE
  #define ft_encoding_unicode         FT_ENCODING_UNICODE
  #define ft_encoding_symbol          FT_ENCODING_MS_SYMBOL
  #define ft_encoding_latin_1         FT_ENCODING_ADOBE_LATIN_1
  #define ft_encoding_latin_2         FT_ENCODING_OLD_LATIN_2
  #define ft_encoding_sjis            FT_ENCODING_SJIS
  #define ft_encoding_gb2312          FT_ENCODING_PRC
  #define ft_encoding_big5            FT_ENCODING_BIG5
  #define ft_encoding_wansung         FT_ENCODING_WANSUNG
  #define ft_encoding_johab           FT_ENCODING_JOHAB
  
  #define ft_encoding_adobe_standard  FT_ENCODING_ADOBE_STANDARD
  #define ft_encoding_adobe_expert    FT_ENCODING_ADOBE_EXPERT
  #define ft_encoding_adobe_custom    FT_ENCODING_ADOBE_CUSTOM
  #define ft_encoding_apple_roman     FT_ENCODING_APPLE_ROMAN
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Struct>                                                              */
    /*    FT_CharMapRec                                                      */
    /*                                                                       */
    /* <Description>                                                         */
    /*    The base charmap structure.                                        */
    /*                                                                       */
    /* <Fields>                                                              */
    /*    face        :: A handle to the parent face object.                 */
    /*                                                                       */
    /*    encoding    :: An @FT_Encoding tag identifying the charmap.  Use   */
    /*                   this with @FT_Select_Charmap.                       */
    /*                                                                       */
    /*    platform_id :: An ID number describing the platform for the        */
    /*                   following encoding ID.  This comes directly from    */
    /*                   the TrueType specification and gets emulated for    */
    /*                   other formats.                                      */
    /*                                                                       */
    /*    encoding_id :: A platform specific encoding number.  This also     */
    /*                   comes from the TrueType specification and gets      */
    /*                   emulated similarly.                                 */
    /*                                                                       */
    typedef struct  FT_CharMapRec_
    {
      FT_Face      face;
      FT_Encoding  encoding;
      FT_UShort    platform_id;
      FT_UShort    encoding_id;
  
    } FT_CharMapRec;
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*                                                                       */
    /*                 B A S E   O B J E C T   C L A S S E S                 */
    /*                                                                       */
    /*************************************************************************/
    /*************************************************************************/
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Type>                                                                */
    /*    FT_Face_Internal                                                   */
    /*                                                                       */
    /* <Description>                                                         */
    /*    An opaque handle to an `FT_Face_InternalRec' structure that models */
    /*    the private data of a given @FT_Face object.                       */
    /*                                                                       */
    /*    This structure might change between releases of FreeType~2 and is  */
    /*    not generally available to client applications.                    */
    /*                                                                       */
    typedef struct FT_Face_InternalRec_*  FT_Face_Internal;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Struct>                                                              */
    /*    FT_FaceRec                                                         */
    /*                                                                       */
    /* <Description>                                                         */
    /*    FreeType root face class structure.  A face object models a        */
    /*    typeface in a font file.                                           */
    /*                                                                       */
    /* <Fields>                                                              */
    /*    num_faces           :: The number of faces in the font file.  Some */
    /*                           font formats can have multiple faces in     */
    /*                           a single font file.                         */
    /*                                                                       */
    /*    face_index          :: This field holds two different values.      */
    /*                           Bits 0-15 are the index of the face in the  */
    /*                           font file (starting with value~0).  They    */
    /*                           are set to~0 if there is only one face in   */
    /*                           the font file.                              */
    /*                                                                       */
    /*                           [Since 2.6.1] Bits 16-30 are relevant to GX */
    /*                           and OpenType variation fonts only, holding  */
    /*                           the named instance index for the current    */
    /*                           face index (starting with value~1; value~0  */
    /*                           indicates font access without a named       */
    /*                           instance).  For non-variation fonts, bits   */
    /*                           16-30 are ignored.  If we have the third    */
    /*                           named instance of face~4, say, `face_index' */
    /*                           is set to 0x00030004.                       */
    /*                                                                       */
    /*                           Bit 31 is always zero (this is,             */
    /*                           `face_index' is always a positive value).   */
    /*                                                                       */
    /*                           [Since 2.9] Changing the design coordinates */
    /*                           with @FT_Set_Var_Design_Coordinates or      */
    /*                           @FT_Set_Var_Blend_Coordinates does not      */
    /*                           influence the named instance index value    */
    /*                           (only @FT_Set_Named_Instance does that).    */
    /*                                                                       */
    /*    face_flags          :: A set of bit flags that give important      */
    /*                           information about the face; see             */
    /*                           @FT_FACE_FLAG_XXX for the details.          */
    /*                                                                       */
    /*    style_flags         :: The lower 16~bits contain a set of bit      */
    /*                           flags indicating the style of the face; see */
    /*                           @FT_STYLE_FLAG_XXX for the details.         */
    /*                                                                       */
    /*                           [Since 2.6.1] Bits 16-30 hold the number    */
    /*                           of named instances available for the        */
    /*                           current face if we have a GX or OpenType    */
    /*                           variation (sub)font.  Bit 31 is always zero */
    /*                           (this is, `style_flags' is always a         */
    /*                           positive value).  Note that a variation     */
    /*                           font has always at least one named          */
    /*                           instance, namely the default instance.      */
    /*                                                                       */
    /*    num_glyphs          :: The number of glyphs in the face.  If the   */
    /*                           face is scalable and has sbits (see         */
    /*                           `num_fixed_sizes'), it is set to the number */
    /*                           of outline glyphs.                          */
    /*                                                                       */
    /*                           For CID-keyed fonts (not in an SFNT         */
    /*                           wrapper) this value gives the highest CID   */
    /*                           used in the font.                           */
    /*                                                                       */
    /*    family_name         :: The face's family name.  This is an ASCII   */
    /*                           string, usually in English, that describes  */
    /*                           the typeface's family (like `Times New      */
    /*                           Roman', `Bodoni', `Garamond', etc).  This   */
    /*                           is a least common denominator used to list  */
    /*                           fonts.  Some formats (TrueType & OpenType)  */
    /*                           provide localized and Unicode versions of   */
    /*                           this string.  Applications should use the   */
    /*                           format specific interface to access them.   */
    /*                           Can be NULL (e.g., in fonts embedded in a   */
    /*                           PDF file).                                  */
    /*                                                                       */
    /*                           In case the font doesn't provide a specific */
    /*                           family name entry, FreeType tries to        */
    /*                           synthesize one, deriving it from other name */
    /*                           entries.                                    */
    /*                                                                       */
    /*    style_name          :: The face's style name.  This is an ASCII    */
    /*                           string, usually in English, that describes  */
    /*                           the typeface's style (like `Italic',        */
    /*                           `Bold', `Condensed', etc).  Not all font    */
    /*                           formats provide a style name, so this field */
    /*                           is optional, and can be set to NULL.  As    */
    /*                           for `family_name', some formats provide     */
    /*                           localized and Unicode versions of this      */
    /*                           string.  Applications should use the format */
    /*                           specific interface to access them.          */
    /*                                                                       */
    /*    num_fixed_sizes     :: The number of bitmap strikes in the face.   */
    /*                           Even if the face is scalable, there might   */
    /*                           still be bitmap strikes, which are called   */
    /*                           `sbits' in that case.                       */
    /*                                                                       */
    /*    available_sizes     :: An array of @FT_Bitmap_Size for all bitmap  */
    /*                           strikes in the face.  It is set to NULL if  */
    /*                           there is no bitmap strike.                  */
    /*                                                                       */
    /*                           Note that FreeType tries to sanitize the    */
    /*                           strike data since they are sometimes sloppy */
    /*                           or incorrect, but this can easily fail.     */
    /*                                                                       */
    /*    num_charmaps        :: The number of charmaps in the face.         */
    /*                                                                       */
    /*    charmaps            :: An array of the charmaps of the face.       */
    /*                                                                       */
    /*    generic             :: A field reserved for client uses.  See the  */
    /*                           @FT_Generic type description.               */
    /*                                                                       */
    /*    bbox                :: The font bounding box.  Coordinates are     */
    /*                           expressed in font units (see                */
    /*                           `units_per_EM').  The box is large enough   */
    /*                           to contain any glyph from the font.  Thus,  */
    /*                           `bbox.yMax' can be seen as the `maximum     */
    /*                           ascender', and `bbox.yMin' as the `minimum  */
    /*                           descender'.  Only relevant for scalable     */
    /*                           formats.                                    */
    /*                                                                       */
    /*                           Note that the bounding box might be off by  */
    /*                           (at least) one pixel for hinted fonts.  See */
    /*                           @FT_Size_Metrics for further discussion.    */
    /*                                                                       */
    /*    units_per_EM        :: The number of font units per EM square for  */
    /*                           this face.  This is typically 2048 for      */
    /*                           TrueType fonts, and 1000 for Type~1 fonts.  */
    /*                           Only relevant for scalable formats.         */
    /*                                                                       */
    /*    ascender            :: The typographic ascender of the face,       */
    /*                           expressed in font units.  For font formats  */
    /*                           not having this information, it is set to   */
    /*                           `bbox.yMax'.  Only relevant for scalable    */
    /*                           formats.                                    */
    /*                                                                       */
    /*    descender           :: The typographic descender of the face,      */
    /*                           expressed in font units.  For font formats  */
    /*                           not having this information, it is set to   */
    /*                           `bbox.yMin'.  Note that this field is       */
    /*                           negative for values below the baseline.     */
    /*                           Only relevant for scalable formats.         */
    /*                                                                       */
    /*    height              :: This value is the vertical distance         */
    /*                           between two consecutive baselines,          */
    /*                           expressed in font units.  It is always      */
    /*                           positive.  Only relevant for scalable       */
    /*                           formats.                                    */
    /*                                                                       */
    /*                           If you want the global glyph height, use    */
    /*                           `ascender - descender'.                     */
    /*                                                                       */
    /*    max_advance_width   :: The maximum advance width, in font units,   */
    /*                           for all glyphs in this face.  This can be   */
    /*                           used to make word wrapping computations     */
    /*                           faster.  Only relevant for scalable         */
    /*                           formats.                                    */
    /*                                                                       */
    /*    max_advance_height  :: The maximum advance height, in font units,  */
    /*                           for all glyphs in this face.  This is only  */
    /*                           relevant for vertical layouts, and is set   */
    /*                           to `height' for fonts that do not provide   */
    /*                           vertical metrics.  Only relevant for        */
    /*                           scalable formats.                           */
    /*                                                                       */
    /*    underline_position  :: The position, in font units, of the         */
    /*                           underline line for this face.  It is the    */
    /*                           center of the underlining stem.  Only       */
    /*                           relevant for scalable formats.              */
    /*                                                                       */
    /*    underline_thickness :: The thickness, in font units, of the        */
    /*                           underline for this face.  Only relevant for */
    /*                           scalable formats.                           */
    /*                                                                       */
    /*    glyph               :: The face's associated glyph slot(s).        */
    /*                                                                       */
    /*    size                :: The current active size for this face.      */
    /*                                                                       */
    /*    charmap             :: The current active charmap for this face.   */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Fields may be changed after a call to @FT_Attach_File or           */
    /*    @FT_Attach_Stream.                                                 */
    /*                                                                       */
    /*    For an OpenType variation font, the values of the following fields */
    /*    can change after a call to @FT_Set_Var_Design_Coordinates (and     */
    /*    friends) if the font contains an `MVAR' table: `ascender',         */
    /*    `descender', `height', `underline_position', and                   */
    /*    `underline_thickness'.                                             */
    /*                                                                       */
    /*    Especially for TrueType fonts see also the documentation for       */
    /*    @FT_Size_Metrics.                                                  */
    /*                                                                       */
    typedef struct  FT_FaceRec_
    {
      FT_Long           num_faces;
      FT_Long           face_index;
  
      FT_Long           face_flags;
      FT_Long           style_flags;
  
      FT_Long           num_glyphs;
  
      FT_String*        family_name;
      FT_String*        style_name;
  
      FT_Int            num_fixed_sizes;
      FT_Bitmap_Size*   available_sizes;
  
      FT_Int            num_charmaps;
      FT_CharMap*       charmaps;
  
      FT_Generic        generic;
  
      /*# The following member variables (down to `underline_thickness') */
      /*# are only relevant to scalable outlines; cf. @FT_Bitmap_Size    */
      /*# for bitmap fonts.                                              */
      FT_BBox           bbox;
  
      FT_UShort         units_per_EM;
      FT_Short          ascender;
      FT_Short          descender;
      FT_Short          height;
  
      FT_Short          max_advance_width;
      FT_Short          max_advance_height;
  
      FT_Short          underline_position;
      FT_Short          underline_thickness;
  
      FT_GlyphSlot      glyph;
      FT_Size           size;
      FT_CharMap        charmap;
  
      /*@private begin */
  
      FT_Driver         driver;
      FT_Memory         memory;
      FT_Stream         stream;
  
      FT_ListRec        sizes_list;
  
      FT_Generic        autohint;   /* face-specific auto-hinter data */
      void*             extensions; /* unused                         */
  
      FT_Face_Internal  internal;
  
      /*@private end */
  
    } FT_FaceRec;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Enum>                                                                */
    /*    FT_FACE_FLAG_XXX                                                   */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A list of bit flags used in the `face_flags' field of the          */
    /*    @FT_FaceRec structure.  They inform client applications of         */
    /*    properties of the corresponding face.                              */
    /*                                                                       */
    /* <Values>                                                              */
    /*    FT_FACE_FLAG_SCALABLE ::                                           */
    /*      The face contains outline glyphs.  Note that a face can contain  */
    /*      bitmap strikes also, i.e., a face can have both this flag and    */
    /*      @FT_FACE_FLAG_FIXED_SIZES set.                                   */
    /*                                                                       */
    /*    FT_FACE_FLAG_FIXED_SIZES ::                                        */
    /*      The face contains bitmap strikes.  See also the                  */
    /*      `num_fixed_sizes' and `available_sizes' fields of @FT_FaceRec.   */
    /*                                                                       */
    /*    FT_FACE_FLAG_FIXED_WIDTH ::                                        */
    /*      The face contains fixed-width characters (like Courier, Lucida,  */
    /*      MonoType, etc.).                                                 */
    /*                                                                       */
    /*    FT_FACE_FLAG_SFNT ::                                               */
    /*      The face uses the SFNT storage scheme.  For now, this means      */
    /*      TrueType and OpenType.                                           */
    /*                                                                       */
    /*    FT_FACE_FLAG_HORIZONTAL ::                                         */
    /*      The face contains horizontal glyph metrics.  This should be set  */
    /*      for all common formats.                                          */
    /*                                                                       */
    /*    FT_FACE_FLAG_VERTICAL ::                                           */
    /*      The face contains vertical glyph metrics.  This is only          */
    /*      available in some formats, not all of them.                      */
    /*                                                                       */
    /*    FT_FACE_FLAG_KERNING ::                                            */
    /*      The face contains kerning information.  If set, the kerning      */
    /*      distance can be retrieved using the function @FT_Get_Kerning.    */
    /*      Otherwise the function always return the vector (0,0).  Note     */
    /*      that FreeType doesn't handle kerning data from the SFNT `GPOS'   */
    /*      table (as present in many OpenType fonts).                       */
    /*                                                                       */
    /*    FT_FACE_FLAG_FAST_GLYPHS ::                                        */
    /*      THIS FLAG IS DEPRECATED.  DO NOT USE OR TEST IT.                 */
    /*                                                                       */
    /*    FT_FACE_FLAG_MULTIPLE_MASTERS ::                                   */
    /*      The face contains multiple masters and is capable of             */
    /*      interpolating between them.  Supported formats are Adobe MM,     */
    /*      TrueType GX, and OpenType variation fonts.                       */
    /*                                                                       */
    /*      See section @multiple_masters for API details.                   */
    /*                                                                       */
    /*    FT_FACE_FLAG_GLYPH_NAMES ::                                        */
    /*      The face contains glyph names, which can be retrieved using      */
    /*      @FT_Get_Glyph_Name.  Note that some TrueType fonts contain       */
    /*      broken glyph name tables.  Use the function                      */
    /*      @FT_Has_PS_Glyph_Names when needed.                              */
    /*                                                                       */
    /*    FT_FACE_FLAG_EXTERNAL_STREAM ::                                    */
    /*      Used internally by FreeType to indicate that a face's stream was */
    /*      provided by the client application and should not be destroyed   */
    /*      when @FT_Done_Face is called.  Don't read or test this flag.     */
    /*                                                                       */
    /*    FT_FACE_FLAG_HINTER ::                                             */
    /*      The font driver has a hinting machine of its own.  For example,  */
    /*      with TrueType fonts, it makes sense to use data from the SFNT    */
    /*      `gasp' table only if the native TrueType hinting engine (with    */
    /*      the bytecode interpreter) is available and active.               */
    /*                                                                       */
    /*    FT_FACE_FLAG_CID_KEYED ::                                          */
    /*      The face is CID-keyed.  In that case, the face is not accessed   */
    /*      by glyph indices but by CID values.  For subsetted CID-keyed     */
    /*      fonts this has the consequence that not all index values are a   */
    /*      valid argument to @FT_Load_Glyph.  Only the CID values for which */
    /*      corresponding glyphs in the subsetted font exist make            */
    /*      `FT_Load_Glyph' return successfully; in all other cases you get  */
    /*      an `FT_Err_Invalid_Argument' error.                              */
    /*                                                                       */
    /*      Note that CID-keyed fonts that are in an SFNT wrapper (this is,  */
    /*      all OpenType/CFF fonts) don't have this flag set since the       */
    /*      glyphs are accessed in the normal way (using contiguous          */
    /*      indices); the `CID-ness' isn't visible to the application.       */
    /*                                                                       */
    /*    FT_FACE_FLAG_TRICKY ::                                             */
    /*      The face is `tricky', this is, it always needs the font format's */
    /*      native hinting engine to get a reasonable result.  A typical     */
    /*      example is the old Chinese font `mingli.ttf' (but not            */
    /*      `mingliu.ttc') that uses TrueType bytecode instructions to move  */
    /*      and scale all of its subglyphs.                                  */
    /*                                                                       */
    /*      It is not possible to auto-hint such fonts using                 */
    /*      @FT_LOAD_FORCE_AUTOHINT; it will also ignore                     */
    /*      @FT_LOAD_NO_HINTING.  You have to set both @FT_LOAD_NO_HINTING   */
    /*      and @FT_LOAD_NO_AUTOHINT to really disable hinting; however, you */
    /*      probably never want this except for demonstration purposes.      */
    /*                                                                       */
    /*      Currently, there are about a dozen TrueType fonts in the list of */
    /*      tricky fonts; they are hard-coded in file `ttobjs.c'.            */
    /*                                                                       */
    /*    FT_FACE_FLAG_COLOR ::                                              */
    /*      [Since 2.5.1] The face has color glyph tables.  To access color  */
    /*      glyphs use @FT_LOAD_COLOR.                                       */
    /*                                                                       */
    /*    FT_FACE_FLAG_VARIATION ::                                          */
    /*      [Since 2.9] Set if the current face (or named instance) has been */
    /*      altered with @FT_Set_MM_Design_Coordinates,                      */
    /*      @FT_Set_Var_Design_Coordinates, or                               */
    /*      @FT_Set_Var_Blend_Coordinates.  This flag is unset by a call to  */
    /*      @FT_Set_Named_Instance.                                          */
    /*                                                                       */
  #define FT_FACE_FLAG_SCALABLE          ( 1L <<  0 )
  #define FT_FACE_FLAG_FIXED_SIZES       ( 1L <<  1 )
  #define FT_FACE_FLAG_FIXED_WIDTH       ( 1L <<  2 )
  #define FT_FACE_FLAG_SFNT              ( 1L <<  3 )
  #define FT_FACE_FLAG_HORIZONTAL        ( 1L <<  4 )
  #define FT_FACE_FLAG_VERTICAL          ( 1L <<  5 )
  #define FT_FACE_FLAG_KERNING           ( 1L <<  6 )
  #define FT_FACE_FLAG_FAST_GLYPHS       ( 1L <<  7 )
  #define FT_FACE_FLAG_MULTIPLE_MASTERS  ( 1L <<  8 )
  #define FT_FACE_FLAG_GLYPH_NAMES       ( 1L <<  9 )
  #define FT_FACE_FLAG_EXTERNAL_STREAM   ( 1L << 10 )
  #define FT_FACE_FLAG_HINTER            ( 1L << 11 )
  #define FT_FACE_FLAG_CID_KEYED         ( 1L << 12 )
  #define FT_FACE_FLAG_TRICKY            ( 1L << 13 )
  #define FT_FACE_FLAG_COLOR             ( 1L << 14 )
  #define FT_FACE_FLAG_VARIATION         ( 1L << 15 )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_HAS_HORIZONTAL( face )
     *
     * @description:
     *   A macro that returns true whenever a face object contains
     *   horizontal metrics (this is true for all font formats though).
     *
     * @also:
     *   @FT_HAS_VERTICAL can be used to check for vertical metrics.
     *
     */
  #define FT_HAS_HORIZONTAL( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_HORIZONTAL )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_HAS_VERTICAL( face )
     *
     * @description:
     *   A macro that returns true whenever a face object contains real
     *   vertical metrics (and not only synthesized ones).
     *
     */
  #define FT_HAS_VERTICAL( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_VERTICAL )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_HAS_KERNING( face )
     *
     * @description:
     *   A macro that returns true whenever a face object contains kerning
     *   data that can be accessed with @FT_Get_Kerning.
     *
     */
  #define FT_HAS_KERNING( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_KERNING )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_IS_SCALABLE( face )
     *
     * @description:
     *   A macro that returns true whenever a face object contains a scalable
     *   font face (true for TrueType, Type~1, Type~42, CID, OpenType/CFF,
     *   and PFR font formats).
     *
     */
  #define FT_IS_SCALABLE( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_SCALABLE )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_IS_SFNT( face )
     *
     * @description:
     *   A macro that returns true whenever a face object contains a font
     *   whose format is based on the SFNT storage scheme.  This usually
     *   means: TrueType fonts, OpenType fonts, as well as SFNT-based embedded
     *   bitmap fonts.
     *
     *   If this macro is true, all functions defined in @FT_SFNT_NAMES_H and
     *   @FT_TRUETYPE_TABLES_H are available.
     *
     */
  #define FT_IS_SFNT( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_SFNT )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_IS_FIXED_WIDTH( face )
     *
     * @description:
     *   A macro that returns true whenever a face object contains a font face
     *   that contains fixed-width (or `monospace', `fixed-pitch', etc.)
     *   glyphs.
     *
     */
  #define FT_IS_FIXED_WIDTH( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_FIXED_WIDTH )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_HAS_FIXED_SIZES( face )
     *
     * @description:
     *   A macro that returns true whenever a face object contains some
     *   embedded bitmaps.  See the `available_sizes' field of the
     *   @FT_FaceRec structure.
     *
     */
  #define FT_HAS_FIXED_SIZES( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_FIXED_SIZES )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_HAS_FAST_GLYPHS( face )
     *
     * @description:
     *   Deprecated.
     *
     */
  #define FT_HAS_FAST_GLYPHS( face )  0
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_HAS_GLYPH_NAMES( face )
     *
     * @description:
     *   A macro that returns true whenever a face object contains some glyph
     *   names that can be accessed through @FT_Get_Glyph_Name.
     *
     */
  #define FT_HAS_GLYPH_NAMES( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_GLYPH_NAMES )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_HAS_MULTIPLE_MASTERS( face )
     *
     * @description:
     *   A macro that returns true whenever a face object contains some
     *   multiple masters.  The functions provided by @FT_MULTIPLE_MASTERS_H
     *   are then available to choose the exact design you want.
     *
     */
  #define FT_HAS_MULTIPLE_MASTERS( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_IS_NAMED_INSTANCE( face )
     *
     * @description:
     *   A macro that returns true whenever a face object is a named instance
     *   of a GX or OpenType variation font.
     *
     *   [Since 2.9] Changing the design coordinates with
     *   @FT_Set_Var_Design_Coordinates or @FT_Set_Var_Blend_Coordinates does
     *   not influence the return value of this macro (only
     *   @FT_Set_Named_Instance does that).
     *
     * @since:
     *   2.7
     *
     */
  #define FT_IS_NAMED_INSTANCE( face ) \
            ( (face)->face_index & 0x7FFF0000L )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_IS_VARIATION( face )
     *
     * @description:
     *   A macro that returns true whenever a face object has been altered
     *   by @FT_Set_MM_Design_Coordinates, @FT_Set_Var_Design_Coordinates, or
     *   @FT_Set_Var_Blend_Coordinates.
     *
     * @since:
     *   2.9
     *
     */
  #define FT_IS_VARIATION( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_VARIATION )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_IS_CID_KEYED( face )
     *
     * @description:
     *   A macro that returns true whenever a face object contains a CID-keyed
     *   font.  See the discussion of @FT_FACE_FLAG_CID_KEYED for more
     *   details.
     *
     *   If this macro is true, all functions defined in @FT_CID_H are
     *   available.
     *
     */
  #define FT_IS_CID_KEYED( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_CID_KEYED )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_IS_TRICKY( face )
     *
     * @description:
     *   A macro that returns true whenever a face represents a `tricky' font.
     *   See the discussion of @FT_FACE_FLAG_TRICKY for more details.
     *
     */
  #define FT_IS_TRICKY( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_TRICKY )
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_HAS_COLOR( face )
     *
     * @description:
     *   A macro that returns true whenever a face object contains
     *   tables for color glyphs.
     *
     * @since:
     *   2.5.1
     *
     */
  #define FT_HAS_COLOR( face ) \
            ( (face)->face_flags & FT_FACE_FLAG_COLOR )
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Const>                                                               */
    /*    FT_STYLE_FLAG_XXX                                                  */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A list of bit flags to indicate the style of a given face.  These  */
    /*    are used in the `style_flags' field of @FT_FaceRec.                */
    /*                                                                       */
    /* <Values>                                                              */
    /*    FT_STYLE_FLAG_ITALIC ::                                            */
    /*      The face style is italic or oblique.                             */
    /*                                                                       */
    /*    FT_STYLE_FLAG_BOLD ::                                              */
    /*      The face is bold.                                                */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The style information as provided by FreeType is very basic.  More */
    /*    details are beyond the scope and should be done on a higher level  */
    /*    (for example, by analyzing various fields of the `OS/2' table in   */
    /*    SFNT based fonts).                                                 */
    /*                                                                       */
  #define FT_STYLE_FLAG_ITALIC  ( 1 << 0 )
  #define FT_STYLE_FLAG_BOLD    ( 1 << 1 )
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Type>                                                                */
    /*    FT_Size_Internal                                                   */
    /*                                                                       */
    /* <Description>                                                         */
    /*    An opaque handle to an `FT_Size_InternalRec' structure, used to    */
    /*    model private data of a given @FT_Size object.                     */
    /*                                                                       */
    typedef struct FT_Size_InternalRec_*  FT_Size_Internal;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Struct>                                                              */
    /*    FT_Size_Metrics                                                    */
    /*                                                                       */
    /* <Description>                                                         */
    /*    The size metrics structure gives the metrics of a size object.     */
    /*                                                                       */
    /* <Fields>                                                              */
    /*    x_ppem       :: The width of the scaled EM square in pixels, hence */
    /*                    the term `ppem' (pixels per EM).  It is also       */
    /*                    referred to as `nominal width'.                    */
    /*                                                                       */
    /*    y_ppem       :: The height of the scaled EM square in pixels,      */
    /*                    hence the term `ppem' (pixels per EM).  It is also */
    /*                    referred to as `nominal height'.                   */
    /*                                                                       */
    /*    x_scale      :: A 16.16 fractional scaling value to convert        */
    /*                    horizontal metrics from font units to 26.6         */
    /*                    fractional pixels.  Only relevant for scalable     */
    /*                    font formats.                                      */
    /*                                                                       */
    /*    y_scale      :: A 16.16 fractional scaling value to convert        */
    /*                    vertical metrics from font units to 26.6           */
    /*                    fractional pixels.  Only relevant for scalable     */
    /*                    font formats.                                      */
    /*                                                                       */
    /*    ascender     :: The ascender in 26.6 fractional pixels, rounded up */
    /*                    to an integer value.  See @FT_FaceRec for the      */
    /*                    details.                                           */
    /*                                                                       */
    /*    descender    :: The descender in 26.6 fractional pixels, rounded   */
    /*                    down to an integer value.  See @FT_FaceRec for the */
    /*                    details.                                           */
    /*                                                                       */
    /*    height       :: The height in 26.6 fractional pixels, rounded to   */
    /*                    an integer value.  See @FT_FaceRec for the         */
    /*                    details.                                           */
    /*                                                                       */
    /*    max_advance  :: The maximum advance width in 26.6 fractional       */
    /*                    pixels, rounded to an integer value.  See          */
    /*                    @FT_FaceRec for the details.                       */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The scaling values, if relevant, are determined first during a     */
    /*    size changing operation.  The remaining fields are then set by the */
    /*    driver.  For scalable formats, they are usually set to scaled      */
    /*    values of the corresponding fields in @FT_FaceRec.  Some values    */
    /*    like ascender or descender are rounded for historical reasons;     */
    /*    more precise values (for outline fonts) can be derived by scaling  */
    /*    the corresponding @FT_FaceRec values manually, with code similar   */
    /*    to the following.                                                  */
    /*                                                                       */
    /*    {                                                                  */
    /*      scaled_ascender = FT_MulFix( face->ascender,                     */
    /*                                   size_metrics->y_scale );            */
    /*    }                                                                  */
    /*                                                                       */
    /*    Note that due to glyph hinting and the selected rendering mode     */
    /*    these values are usually not exact; consequently, they must be     */
    /*    treated as unreliable with an error margin of at least one pixel!  */
    /*                                                                       */
    /*    Indeed, the only way to get the exact metrics is to render _all_   */
    /*    glyphs.  As this would be a definite performance hit, it is up to  */
    /*    client applications to perform such computations.                  */
    /*                                                                       */
    /*    The `FT_Size_Metrics' structure is valid for bitmap fonts also.    */
    /*                                                                       */
    /*                                                                       */
    /*    *TrueType* *fonts* *with* *native* *bytecode* *hinting*            */
    /*                                                                       */
    /*    All applications that handle TrueType fonts with native hinting    */
    /*    must be aware that TTFs expect different rounding of vertical font */
    /*    dimensions.  The application has to cater for this, especially if  */
    /*    it wants to rely on a TTF's vertical data (for example, to         */
    /*    properly align box characters vertically).                         */
    /*                                                                       */
    /*    Only the application knows _in_ _advance_ that it is going to use  */
    /*    native hinting for TTFs!  FreeType, on the other hand, selects the */
    /*    hinting mode not at the time of creating an @FT_Size object but    */
    /*    much later, namely while calling @FT_Load_Glyph.                   */
    /*                                                                       */
    /*    Here is some pseudo code that illustrates a possible solution.     */
    /*                                                                       */
    /*    {                                                                  */
    /*      font_format = FT_Get_Font_Format( face );                        */
    /*                                                                       */
    /*      if ( !strcmp( font_format, "TrueType" ) &&                       */
    /*           do_native_bytecode_hinting         )                        */
    /*      {                                                                */
    /*        ascender  = ROUND( FT_MulFix( face->ascender,                  */
    /*                                      size_metrics->y_scale ) );       */
    /*        descender = ROUND( FT_MulFix( face->descender,                 */
    /*                                      size_metrics->y_scale ) );       */
    /*      }                                                                */
    /*      else                                                             */
    /*      {                                                                */
    /*        ascender  = size_metrics->ascender;                            */
    /*        descender = size_metrics->descender;                           */
    /*      }                                                                */
    /*                                                                       */
    /*      height      = size_metrics->height;                              */
    /*      max_advance = size_metrics->max_advance;                         */
    /*    }                                                                  */
    /*                                                                       */
    typedef struct  FT_Size_Metrics_
    {
      FT_UShort  x_ppem;      /* horizontal pixels per EM               */
      FT_UShort  y_ppem;      /* vertical pixels per EM                 */
  
      FT_Fixed   x_scale;     /* scaling values used to convert font    */
      FT_Fixed   y_scale;     /* units to 26.6 fractional pixels        */
  
      FT_Pos     ascender;    /* ascender in 26.6 frac. pixels          */
      FT_Pos     descender;   /* descender in 26.6 frac. pixels         */
      FT_Pos     height;      /* text height in 26.6 frac. pixels       */
      FT_Pos     max_advance; /* max horizontal advance, in 26.6 pixels */
  
    } FT_Size_Metrics;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Struct>                                                              */
    /*    FT_SizeRec                                                         */
    /*                                                                       */
    /* <Description>                                                         */
    /*    FreeType root size class structure.  A size object models a face   */
    /*    object at a given size.                                            */
    /*                                                                       */
    /* <Fields>                                                              */
    /*    face    :: Handle to the parent face object.                       */
    /*                                                                       */
    /*    generic :: A typeless pointer, unused by the FreeType library or   */
    /*               any of its drivers.  It can be used by client           */
    /*               applications to link their own data to each size        */
    /*               object.                                                 */
    /*                                                                       */
    /*    metrics :: Metrics for this size object.  This field is read-only. */
    /*                                                                       */
    typedef struct  FT_SizeRec_
    {
      FT_Face           face;      /* parent face object              */
      FT_Generic        generic;   /* generic pointer for client uses */
      FT_Size_Metrics   metrics;   /* size metrics                    */
      FT_Size_Internal  internal;
  
    } FT_SizeRec;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Struct>                                                              */
    /*    FT_SubGlyph                                                        */
    /*                                                                       */
    /* <Description>                                                         */
    /*    The subglyph structure is an internal object used to describe      */
    /*    subglyphs (for example, in the case of composites).                */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The subglyph implementation is not part of the high-level API,     */
    /*    hence the forward structure declaration.                           */
    /*                                                                       */
    /*    You can however retrieve subglyph information with                 */
    /*    @FT_Get_SubGlyph_Info.                                             */
    /*                                                                       */
    typedef struct FT_SubGlyphRec_*  FT_SubGlyph;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Type>                                                                */
    /*    FT_Slot_Internal                                                   */
    /*                                                                       */
    /* <Description>                                                         */
    /*    An opaque handle to an `FT_Slot_InternalRec' structure, used to    */
    /*    model private data of a given @FT_GlyphSlot object.                */
    /*                                                                       */
    typedef struct FT_Slot_InternalRec_*  FT_Slot_Internal;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Struct>                                                              */
    /*    FT_GlyphSlotRec                                                    */
    /*                                                                       */
    /* <Description>                                                         */
    /*    FreeType root glyph slot class structure.  A glyph slot is a       */
    /*    container where individual glyphs can be loaded, be they in        */
    /*    outline or bitmap format.                                          */
    /*                                                                       */
    /* <Fields>                                                              */
    /*    library           :: A handle to the FreeType library instance     */
    /*                         this slot belongs to.                         */
    /*                                                                       */
    /*    face              :: A handle to the parent face object.           */
    /*                                                                       */
    /*    next              :: In some cases (like some font tools), several */
    /*                         glyph slots per face object can be a good     */
    /*                         thing.  As this is rare, the glyph slots are  */
    /*                         listed through a direct, single-linked list   */
    /*                         using its `next' field.                       */
    /*                                                                       */
    /*    generic           :: A typeless pointer unused by the FreeType     */
    /*                         library or any of its drivers.  It can be     */
    /*                         used by client applications to link their own */
    /*                         data to each glyph slot object.               */
    /*                                                                       */
    /*    metrics           :: The metrics of the last loaded glyph in the   */
    /*                         slot.  The returned values depend on the last */
    /*                         load flags (see the @FT_Load_Glyph API        */
    /*                         function) and can be expressed either in 26.6 */
    /*                         fractional pixels or font units.              */
    /*                                                                       */
    /*                         Note that even when the glyph image is        */
    /*                         transformed, the metrics are not.             */
    /*                                                                       */
    /*    linearHoriAdvance :: The advance width of the unhinted glyph.      */
    /*                         Its value is expressed in 16.16 fractional    */
    /*                         pixels, unless @FT_LOAD_LINEAR_DESIGN is set  */
    /*                         when loading the glyph.  This field can be    */
    /*                         important to perform correct WYSIWYG layout.  */
    /*                         Only relevant for outline glyphs.             */
    /*                                                                       */
    /*    linearVertAdvance :: The advance height of the unhinted glyph.     */
    /*                         Its value is expressed in 16.16 fractional    */
    /*                         pixels, unless @FT_LOAD_LINEAR_DESIGN is set  */
    /*                         when loading the glyph.  This field can be    */
    /*                         important to perform correct WYSIWYG layout.  */
    /*                         Only relevant for outline glyphs.             */
    /*                                                                       */
    /*    advance           :: This shorthand is, depending on               */
    /*                         @FT_LOAD_IGNORE_TRANSFORM, the transformed    */
    /*                         (hinted) advance width for the glyph, in 26.6 */
    /*                         fractional pixel format.  As specified with   */
    /*                         @FT_LOAD_VERTICAL_LAYOUT, it uses either the  */
    /*                         `horiAdvance' or the `vertAdvance' value of   */
    /*                         `metrics' field.                              */
    /*                                                                       */
    /*    format            :: This field indicates the format of the image  */
    /*                         contained in the glyph slot.  Typically       */
    /*                         @FT_GLYPH_FORMAT_BITMAP,                      */
    /*                         @FT_GLYPH_FORMAT_OUTLINE, or                  */
    /*                         @FT_GLYPH_FORMAT_COMPOSITE, but other values  */
    /*                         are possible.                                 */
    /*                                                                       */
    /*    bitmap            :: This field is used as a bitmap descriptor.    */
    /*                         Note that the address and content of the      */
    /*                         bitmap buffer can change between calls of     */
    /*                         @FT_Load_Glyph and a few other functions.     */
    /*                                                                       */
    /*    bitmap_left       :: The bitmap's left bearing expressed in        */
    /*                         integer pixels.                               */
    /*                                                                       */
    /*    bitmap_top        :: The bitmap's top bearing expressed in integer */
    /*                         pixels.  This is the distance from the        */
    /*                         baseline to the top-most glyph scanline,      */
    /*                         upwards y~coordinates being *positive*.       */
    /*                                                                       */
    /*    outline           :: The outline descriptor for the current glyph  */
    /*                         image if its format is                        */
    /*                         @FT_GLYPH_FORMAT_OUTLINE.  Once a glyph is    */
    /*                         loaded, `outline' can be transformed,         */
    /*                         distorted, emboldened, etc.  However, it must */
    /*                         not be freed.                                 */
    /*                                                                       */
    /*    num_subglyphs     :: The number of subglyphs in a composite glyph. */
    /*                         This field is only valid for the composite    */
    /*                         glyph format that should normally only be     */
    /*                         loaded with the @FT_LOAD_NO_RECURSE flag.     */
    /*                                                                       */
    /*    subglyphs         :: An array of subglyph descriptors for          */
    /*                         composite glyphs.  There are `num_subglyphs'  */
    /*                         elements in there.  Currently internal to     */
    /*                         FreeType.                                     */
    /*                                                                       */
    /*    control_data      :: Certain font drivers can also return the      */
    /*                         control data for a given glyph image (e.g.    */
    /*                         TrueType bytecode, Type~1 charstrings, etc.). */
    /*                         This field is a pointer to such data; it is   */
    /*                         currently internal to FreeType.               */
    /*                                                                       */
    /*    control_len       :: This is the length in bytes of the control    */
    /*                         data.  Currently internal to FreeType.        */
    /*                                                                       */
    /*    other             :: Reserved.                                     */
    /*                                                                       */
    /*    lsb_delta         :: The difference between hinted and unhinted    */
    /*                         left side bearing while auto-hinting is       */
    /*                         active.  Zero otherwise.                      */
    /*                                                                       */
    /*    rsb_delta         :: The difference between hinted and unhinted    */
    /*                         right side bearing while auto-hinting is      */
    /*                         active.  Zero otherwise.                      */
    /*                                                                       */
    /* <Note>                                                                */
    /*    If @FT_Load_Glyph is called with default flags (see                */
    /*    @FT_LOAD_DEFAULT) the glyph image is loaded in the glyph slot in   */
    /*    its native format (e.g., an outline glyph for TrueType and Type~1  */
    /*    formats).  [Since 2.9] The prospective bitmap metrics are          */
    /*    calculated according to @FT_LOAD_TARGET_XXX and other flags even   */
    /*    for the outline glyph, even if @FT_LOAD_RENDER is not set.         */
    /*                                                                       */
    /*    This image can later be converted into a bitmap by calling         */
    /*    @FT_Render_Glyph.  This function searches the current renderer for */
    /*    the native image's format, then invokes it.                        */
    /*                                                                       */
    /*    The renderer is in charge of transforming the native image through */
    /*    the slot's face transformation fields, then converting it into a   */
    /*    bitmap that is returned in `slot->bitmap'.                         */
    /*                                                                       */
    /*    Note that `slot->bitmap_left' and `slot->bitmap_top' are also used */
    /*    to specify the position of the bitmap relative to the current pen  */
    /*    position (e.g., coordinates (0,0) on the baseline).  Of course,    */
    /*    `slot->format' is also changed to @FT_GLYPH_FORMAT_BITMAP.         */
    /*                                                                       */
    /*    Here is a small pseudo code fragment that shows how to use         */
    /*    `lsb_delta' and `rsb_delta' to do fractional positioning of        */
    /*    glyphs:                                                            */
    /*                                                                       */
    /*    {                                                                  */
    /*      FT_GlyphSlot  slot     = face->glyph;                            */
    /*      FT_Pos        origin_x = 0;                                      */
    /*                                                                       */
    /*                                                                       */
    /*      for all glyphs do                                                */
    /*        <load glyph with `FT_Load_Glyph'>                              */
    /*                                                                       */
    /*        FT_Outline_Translate( slot->outline, origin_x & 63, 0 );       */
    /*                                                                       */
    /*        <save glyph image, or render glyph, or ...>                    */
    /*                                                                       */
    /*        <compute kern between current and next glyph                   */
    /*         and add it to `origin_x'>                                     */
    /*                                                                       */
    /*        origin_x += slot->advance.x;                                   */
    /*        origin_x += slot->rsb_delta - slot->lsb_delta;                 */
    /*      endfor                                                           */
    /*    }                                                                  */
    /*                                                                       */
    /*    Here is another small pseudo code fragment that shows how to use   */
    /*    `lsb_delta' and `rsb_delta' to improve integer positioning of      */
    /*    glyphs:                                                            */
    /*                                                                       */
    /*    {                                                                  */
    /*      FT_GlyphSlot  slot           = face->glyph;                      */
    /*      FT_Pos        origin_x       = 0;                                */
    /*      FT_Pos        prev_rsb_delta = 0;                                */
    /*                                                                       */
    /*                                                                       */
    /*      for all glyphs do                                                */
    /*        <compute kern between current and previous glyph               */
    /*         and add it to `origin_x'>                                     */
    /*                                                                       */
    /*        <load glyph with `FT_Load_Glyph'>                              */
    /*                                                                       */
    /*        if ( prev_rsb_delta - slot->lsb_delta >  32 )                  */
    /*          origin_x -= 64;                                              */
    /*        else if ( prev_rsb_delta - slot->lsb_delta < -31 )             */
    /*          origin_x += 64;                                              */
    /*                                                                       */
    /*        prev_rsb_delta = slot->rsb_delta;                              */
    /*                                                                       */
    /*        <save glyph image, or render glyph, or ...>                    */
    /*                                                                       */
    /*        origin_x += slot->advance.x;                                   */
    /*      endfor                                                           */
    /*    }                                                                  */
    /*                                                                       */
    /*    If you use strong auto-hinting, you *must* apply these delta       */
    /*    values!  Otherwise you will experience far too large inter-glyph   */
    /*    spacing at small rendering sizes in most cases.  Note that it      */
    /*    doesn't harm to use the above code for other hinting modes also,   */
    /*    since the delta values are zero then.                              */
    /*                                                                       */
    typedef struct  FT_GlyphSlotRec_
    {
      FT_Library        library;
      FT_Face           face;
      FT_GlyphSlot      next;
      FT_UInt           reserved;       /* retained for binary compatibility */
      FT_Generic        generic;
  
      FT_Glyph_Metrics  metrics;
      FT_Fixed          linearHoriAdvance;
      FT_Fixed          linearVertAdvance;
      FT_Vector         advance;
  
      FT_Glyph_Format   format;
  
      FT_Bitmap         bitmap;
      FT_Int            bitmap_left;
      FT_Int            bitmap_top;
  
      FT_Outline        outline;
  
      FT_UInt           num_subglyphs;
      FT_SubGlyph       subglyphs;
  
      void*             control_data;
      long              control_len;
  
      FT_Pos            lsb_delta;
      FT_Pos            rsb_delta;
  
      void*             other;
  
      FT_Slot_Internal  internal;
  
    } FT_GlyphSlotRec;
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*                                                                       */
    /*                         F U N C T I O N S                             */
    /*                                                                       */
    /*************************************************************************/
    /*************************************************************************/
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Init_FreeType                                                   */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Initialize a new FreeType library object.  The set of modules      */
    /*    that are registered by this function is determined at build time.  */
    /*                                                                       */
    /* <Output>                                                              */
    /*    alibrary :: A handle to a new library object.                      */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    In case you want to provide your own memory allocating routines,   */
    /*    use @FT_New_Library instead, followed by a call to                 */
    /*    @FT_Add_Default_Modules (or a series of calls to @FT_Add_Module)   */
    /*    and @FT_Set_Default_Properties.                                    */
    /*                                                                       */
    /*    See the documentation of @FT_Library and @FT_Face for              */
    /*    multi-threading issues.                                            */
    /*                                                                       */
    /*    If you need reference-counting (cf. @FT_Reference_Library), use    */
    /*    @FT_New_Library and @FT_Done_Library.                              */
    /*                                                                       */
    /*    If compilation option FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES is   */
    /*    set, this function reads the `FREETYPE_PROPERTIES' environment     */
    /*    variable to control driver properties.  See section @properties    */
    /*    for more.                                                          */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Init_FreeType( FT_Library  *alibrary );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Done_FreeType                                                   */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Destroy a given FreeType library object and all of its children,   */
    /*    including resources, drivers, faces, sizes, etc.                   */
    /*                                                                       */
    /* <Input>                                                               */
    /*    library :: A handle to the target library object.                  */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Done_FreeType( FT_Library  library );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Enum>                                                                */
    /*    FT_OPEN_XXX                                                        */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A list of bit field constants used within the `flags' field of the */
    /*    @FT_Open_Args structure.                                           */
    /*                                                                       */
    /* <Values>                                                              */
    /*    FT_OPEN_MEMORY   :: This is a memory-based stream.                 */
    /*                                                                       */
    /*    FT_OPEN_STREAM   :: Copy the stream from the `stream' field.       */
    /*                                                                       */
    /*    FT_OPEN_PATHNAME :: Create a new input stream from a C~path        */
    /*                        name.                                          */
    /*                                                                       */
    /*    FT_OPEN_DRIVER   :: Use the `driver' field.                        */
    /*                                                                       */
    /*    FT_OPEN_PARAMS   :: Use the `num_params' and `params' fields.      */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The `FT_OPEN_MEMORY', `FT_OPEN_STREAM', and `FT_OPEN_PATHNAME'     */
    /*    flags are mutually exclusive.                                      */
    /*                                                                       */
  #define FT_OPEN_MEMORY    0x1
  #define FT_OPEN_STREAM    0x2
  #define FT_OPEN_PATHNAME  0x4
  #define FT_OPEN_DRIVER    0x8
  #define FT_OPEN_PARAMS    0x10
  
  
    /* these constants are deprecated; use the corresponding `FT_OPEN_XXX' */
    /* values instead                                                      */
  #define ft_open_memory    FT_OPEN_MEMORY
  #define ft_open_stream    FT_OPEN_STREAM
  #define ft_open_pathname  FT_OPEN_PATHNAME
  #define ft_open_driver    FT_OPEN_DRIVER
  #define ft_open_params    FT_OPEN_PARAMS
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Struct>                                                              */
    /*    FT_Parameter                                                       */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A simple structure to pass more or less generic parameters to      */
    /*    @FT_Open_Face and @FT_Face_Properties.                             */
    /*                                                                       */
    /* <Fields>                                                              */
    /*    tag  :: A four-byte identification tag.                            */
    /*                                                                       */
    /*    data :: A pointer to the parameter data.                           */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The ID and function of parameters are driver-specific.  See        */
    /*    section @parameter_tags for more information.                      */
    /*                                                                       */
    typedef struct  FT_Parameter_
    {
      FT_ULong    tag;
      FT_Pointer  data;
  
    } FT_Parameter;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Struct>                                                              */
    /*    FT_Open_Args                                                       */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A structure to indicate how to open a new font file or stream.  A  */
    /*    pointer to such a structure can be used as a parameter for the     */
    /*    functions @FT_Open_Face and @FT_Attach_Stream.                     */
    /*                                                                       */
    /* <Fields>                                                              */
    /*    flags       :: A set of bit flags indicating how to use the        */
    /*                   structure.                                          */
    /*                                                                       */
    /*    memory_base :: The first byte of the file in memory.               */
    /*                                                                       */
    /*    memory_size :: The size in bytes of the file in memory.            */
    /*                                                                       */
    /*    pathname    :: A pointer to an 8-bit file pathname.                */
    /*                                                                       */
    /*    stream      :: A handle to a source stream object.                 */
    /*                                                                       */
    /*    driver      :: This field is exclusively used by @FT_Open_Face;    */
    /*                   it simply specifies the font driver to use for      */
    /*                   opening the face.  If set to NULL, FreeType tries   */
    /*                   to load the face with each one of the drivers in    */
    /*                   its list.                                           */
    /*                                                                       */
    /*    num_params  :: The number of extra parameters.                     */
    /*                                                                       */
    /*    params      :: Extra parameters passed to the font driver when     */
    /*                   opening a new face.                                 */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The stream type is determined by the contents of `flags' that      */
    /*    are tested in the following order by @FT_Open_Face:                */
    /*                                                                       */
    /*    If the @FT_OPEN_MEMORY bit is set, assume that this is a           */
    /*    memory file of `memory_size' bytes, located at `memory_address'.   */
    /*    The data are not copied, and the client is responsible for         */
    /*    releasing and destroying them _after_ the corresponding call to    */
    /*    @FT_Done_Face.                                                     */
    /*                                                                       */
    /*    Otherwise, if the @FT_OPEN_STREAM bit is set, assume that a        */
    /*    custom input stream `stream' is used.                              */
    /*                                                                       */
    /*    Otherwise, if the @FT_OPEN_PATHNAME bit is set, assume that this   */
    /*    is a normal file and use `pathname' to open it.                    */
    /*                                                                       */
    /*    If the @FT_OPEN_DRIVER bit is set, @FT_Open_Face only tries to     */
    /*    open the file with the driver whose handler is in `driver'.        */
    /*                                                                       */
    /*    If the @FT_OPEN_PARAMS bit is set, the parameters given by         */
    /*    `num_params' and `params' is used.  They are ignored otherwise.    */
    /*                                                                       */
    /*    Ideally, both the `pathname' and `params' fields should be tagged  */
    /*    as `const'; this is missing for API backward compatibility.  In    */
    /*    other words, applications should treat them as read-only.          */
    /*                                                                       */
    typedef struct  FT_Open_Args_
    {
      FT_UInt         flags;
      const FT_Byte*  memory_base;
      FT_Long         memory_size;
      FT_String*      pathname;
      FT_Stream       stream;
      FT_Module       driver;
      FT_Int          num_params;
      FT_Parameter*   params;
  
    } FT_Open_Args;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_New_Face                                                        */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Call @FT_Open_Face to open a font by its pathname.                 */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    library    :: A handle to the library resource.                    */
    /*                                                                       */
    /* <Input>                                                               */
    /*    pathname   :: A path to the font file.                             */
    /*                                                                       */
    /*    face_index :: See @FT_Open_Face for a detailed description of this */
    /*                  parameter.                                           */
    /*                                                                       */
    /* <Output>                                                              */
    /*    aface      :: A handle to a new face object.  If `face_index' is   */
    /*                  greater than or equal to zero, it must be non-NULL.  */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Use @FT_Done_Face to destroy the created @FT_Face object (along    */
    /*    with its slot and sizes).                                          */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_New_Face( FT_Library   library,
                 const char*  filepathname,
                 FT_Long      face_index,
                 FT_Face     *aface );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_New_Memory_Face                                                 */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Call @FT_Open_Face to open a font that has been loaded into        */
    /*    memory.                                                            */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    library    :: A handle to the library resource.                    */
    /*                                                                       */
    /* <Input>                                                               */
    /*    file_base  :: A pointer to the beginning of the font data.         */
    /*                                                                       */
    /*    file_size  :: The size of the memory chunk used by the font data.  */
    /*                                                                       */
    /*    face_index :: See @FT_Open_Face for a detailed description of this */
    /*                  parameter.                                           */
    /*                                                                       */
    /* <Output>                                                              */
    /*    aface      :: A handle to a new face object.  If `face_index' is   */
    /*                  greater than or equal to zero, it must be non-NULL.  */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    You must not deallocate the memory before calling @FT_Done_Face.   */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_New_Memory_Face( FT_Library      library,
                        const FT_Byte*  file_base,
                        FT_Long         file_size,
                        FT_Long         face_index,
                        FT_Face        *aface );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Open_Face                                                       */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Create a face object from a given resource described by            */
    /*    @FT_Open_Args.                                                     */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    library    :: A handle to the library resource.                    */
    /*                                                                       */
    /* <Input>                                                               */
    /*    args       :: A pointer to an `FT_Open_Args' structure that must   */
    /*                  be filled by the caller.                             */
    /*                                                                       */
    /*    face_index :: This field holds two different values.  Bits 0-15    */
    /*                  are the index of the face in the font file (starting */
    /*                  with value~0).  Set it to~0 if there is only one     */
    /*                  face in the font file.                               */
    /*                                                                       */
    /*                  [Since 2.6.1] Bits 16-30 are relevant to GX and      */
    /*                  OpenType variation fonts only, specifying the named  */
    /*                  instance index for the current face index (starting  */
    /*                  with value~1; value~0 makes FreeType ignore named    */
    /*                  instances).  For non-variation fonts, bits 16-30 are */
    /*                  ignored.  Assuming that you want to access the third */
    /*                  named instance in face~4, `face_index' should be set */
    /*                  to 0x00030004.  If you want to access face~4 without */
    /*                  variation handling, simply set `face_index' to       */
    /*                  value~4.                                             */
    /*                                                                       */
    /*                  `FT_Open_Face' and its siblings can be used to       */
    /*                  quickly check whether the font format of a given     */
    /*                  font resource is supported by FreeType.  In general, */
    /*                  if the `face_index' argument is negative, the        */
    /*                  function's return value is~0 if the font format is   */
    /*                  recognized, or non-zero otherwise.  The function     */
    /*                  allocates a more or less empty face handle in        */
    /*                  `*aface' (if `aface' isn't NULL); the only two       */
    /*                  useful fields in this special case are               */
    /*                  `face->num_faces' and `face->style_flags'.  For any  */
    /*                  negative value of `face_index', `face->num_faces'    */
    /*                  gives the number of faces within the font file.  For */
    /*                  the negative value `-(N+1)' (with `N' a non-negative */
    /*                  16-bit value), bits 16-30 in `face->style_flags'     */
    /*                  give the number of named instances in face `N' if we */
    /*                  have a variation font (or zero otherwise).  After    */
    /*                  examination, the returned @FT_Face structure should  */
    /*                  be deallocated with a call to @FT_Done_Face.         */
    /*                                                                       */
    /* <Output>                                                              */
    /*    aface      :: A handle to a new face object.  If `face_index' is   */
    /*                  greater than or equal to zero, it must be non-NULL.  */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Unlike FreeType 1.x, this function automatically creates a glyph   */
    /*    slot for the face object that can be accessed directly through     */
    /*    `face->glyph'.                                                     */
    /*                                                                       */
    /*    Each new face object created with this function also owns a        */
    /*    default @FT_Size object, accessible as `face->size'.               */
    /*                                                                       */
    /*    One @FT_Library instance can have multiple face objects, this is,  */
    /*    @FT_Open_Face and its siblings can be called multiple times using  */
    /*    the same `library' argument.                                       */
    /*                                                                       */
    /*    See the discussion of reference counters in the description of     */
    /*    @FT_Reference_Face.                                                */
    /*                                                                       */
    /*    To loop over all faces, use code similar to the following snippet  */
    /*    (omitting the error handling).                                     */
    /*                                                                       */
    /*    {                                                                  */
    /*      ...                                                              */
    /*      FT_Face  face;                                                   */
    /*      FT_Long  i, num_faces;                                           */
    /*                                                                       */
    /*                                                                       */
    /*      error = FT_Open_Face( library, args, -1, &face );                */
    /*      if ( error ) { ... }                                             */
    /*                                                                       */
    /*      num_faces = face->num_faces;                                     */
    /*      FT_Done_Face( face );                                            */
    /*                                                                       */
    /*      for ( i = 0; i < num_faces; i++ )                                */
    /*      {                                                                */
    /*        ...                                                            */
    /*        error = FT_Open_Face( library, args, i, &face );               */
    /*        ...                                                            */
    /*        FT_Done_Face( face );                                          */
    /*        ...                                                            */
    /*      }                                                                */
    /*    }                                                                  */
    /*                                                                       */
    /*    To loop over all valid values for `face_index', use something      */
    /*    similar to the following snippet, again without error handling.    */
    /*    The code accesses all faces immediately (thus only a single call   */
    /*    of `FT_Open_Face' within the do-loop), with and without named      */
    /*    instances.                                                         */
    /*                                                                       */
    /*    {                                                                  */
    /*      ...                                                              */
    /*      FT_Face  face;                                                   */
    /*                                                                       */
    /*      FT_Long  num_faces     = 0;                                      */
    /*      FT_Long  num_instances = 0;                                      */
    /*                                                                       */
    /*      FT_Long  face_idx     = 0;                                       */
    /*      FT_Long  instance_idx = 0;                                       */
    /*                                                                       */
    /*                                                                       */
    /*      do                                                               */
    /*      {                                                                */
    /*        FT_Long  id = ( instance_idx << 16 ) + face_idx;               */
    /*                                                                       */
    /*                                                                       */
    /*        error = FT_Open_Face( library, args, id, &face );              */
    /*        if ( error ) { ... }                                           */
    /*                                                                       */
    /*        num_faces     = face->num_faces;                               */
    /*        num_instances = face->style_flags >> 16;                       */
    /*                                                                       */
    /*        ...                                                            */
    /*                                                                       */
    /*        FT_Done_Face( face );                                          */
    /*                                                                       */
    /*        if ( instance_idx < num_instances )                            */
    /*          instance_idx++;                                              */
    /*        else                                                           */
    /*        {                                                              */
    /*          face_idx++;                                                  */
    /*          instance_idx = 0;                                            */
    /*        }                                                              */
    /*                                                                       */
    /*      } while ( face_idx < num_faces )                                 */
    /*    }                                                                  */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Open_Face( FT_Library           library,
                  const FT_Open_Args*  args,
                  FT_Long              face_index,
                  FT_Face             *aface );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Attach_File                                                     */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Call @FT_Attach_Stream to attach a file.                           */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    face         :: The target face object.                            */
    /*                                                                       */
    /* <Input>                                                               */
    /*    filepathname :: The pathname.                                      */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Attach_File( FT_Face      face,
                    const char*  filepathname );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Attach_Stream                                                   */
    /*                                                                       */
    /* <Description>                                                         */
    /*    `Attach' data to a face object.  Normally, this is used to read    */
    /*    additional information for the face object.  For example, you can  */
    /*    attach an AFM file that comes with a Type~1 font to get the        */
    /*    kerning values and other metrics.                                  */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    face       :: The target face object.                              */
    /*                                                                       */
    /* <Input>                                                               */
    /*    parameters :: A pointer to @FT_Open_Args that must be filled by    */
    /*                  the caller.                                          */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The meaning of the `attach' (i.e., what really happens when the    */
    /*    new file is read) is not fixed by FreeType itself.  It really      */
    /*    depends on the font format (and thus the font driver).             */
    /*                                                                       */
    /*    Client applications are expected to know what they are doing       */
    /*    when invoking this function.  Most drivers simply do not implement */
    /*    file or stream attachments.                                        */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Attach_Stream( FT_Face        face,
                      FT_Open_Args*  parameters );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Reference_Face                                                  */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A counter gets initialized to~1 at the time an @FT_Face structure  */
    /*    is created.  This function increments the counter.  @FT_Done_Face  */
    /*    then only destroys a face if the counter is~1, otherwise it simply */
    /*    decrements the counter.                                            */
    /*                                                                       */
    /*    This function helps in managing life-cycles of structures that     */
    /*    reference @FT_Face objects.                                        */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face :: A handle to a target face object.                          */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Since>                                                               */
    /*    2.4.2                                                              */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Reference_Face( FT_Face  face );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Done_Face                                                       */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Discard a given face object, as well as all of its child slots and */
    /*    sizes.                                                             */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face :: A handle to a target face object.                          */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    See the discussion of reference counters in the description of     */
    /*    @FT_Reference_Face.                                                */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Done_Face( FT_Face  face );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Select_Size                                                     */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Select a bitmap strike.  To be more precise, this function sets    */
    /*    the scaling factors of the active @FT_Size object in a face so     */
    /*    that bitmaps from this particular strike are taken by              */
    /*    @FT_Load_Glyph and friends.                                        */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    face         :: A handle to a target face object.                  */
    /*                                                                       */
    /* <Input>                                                               */
    /*    strike_index :: The index of the bitmap strike in the              */
    /*                    `available_sizes' field of @FT_FaceRec structure.  */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    For bitmaps embedded in outline fonts it is common that only a     */
    /*    subset of the available glyphs at a given ppem value is available. */
    /*    FreeType silently uses outlines if there is no bitmap for a given  */
    /*    glyph index.                                                       */
    /*                                                                       */
    /*    For GX and OpenType variation fonts, a bitmap strike makes sense   */
    /*    only if the default instance is active (this is, no glyph          */
    /*    variation takes place); otherwise, FreeType simply ignores bitmap  */
    /*    strikes.  The same is true for all named instances that are        */
    /*    different from the default instance.                               */
    /*                                                                       */
    /*    Don't use this function if you are using the FreeType cache API.   */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Select_Size( FT_Face  face,
                    FT_Int   strike_index );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Enum>                                                                */
    /*    FT_Size_Request_Type                                               */
    /*                                                                       */
    /* <Description>                                                         */
    /*    An enumeration type that lists the supported size request types,   */
    /*    i.e., what input size (in font units) maps to the requested output */
    /*    size (in pixels, as computed from the arguments of                 */
    /*    @FT_Size_Request).                                                 */
    /*                                                                       */
    /* <Values>                                                              */
    /*    FT_SIZE_REQUEST_TYPE_NOMINAL ::                                    */
    /*      The nominal size.  The `units_per_EM' field of @FT_FaceRec is    */
    /*      used to determine both scaling values.                           */
    /*                                                                       */
    /*      This is the standard scaling found in most applications.  In     */
    /*      particular, use this size request type for TrueType fonts if     */
    /*      they provide optical scaling or something similar.  Note,        */
    /*      however, that `units_per_EM' is a rather abstract value which    */
    /*      bears no relation to the actual size of the glyphs in a font.    */
    /*                                                                       */
    /*    FT_SIZE_REQUEST_TYPE_REAL_DIM ::                                   */
    /*      The real dimension.  The sum of the `ascender' and (minus of)    */
    /*      the `descender' fields of @FT_FaceRec is used to determine both  */
    /*      scaling values.                                                  */
    /*                                                                       */
    /*    FT_SIZE_REQUEST_TYPE_BBOX ::                                       */
    /*      The font bounding box.  The width and height of the `bbox' field */
    /*      of @FT_FaceRec are used to determine the horizontal and vertical */
    /*      scaling value, respectively.                                     */
    /*                                                                       */
    /*    FT_SIZE_REQUEST_TYPE_CELL ::                                       */
    /*      The `max_advance_width' field of @FT_FaceRec is used to          */
    /*      determine the horizontal scaling value; the vertical scaling     */
    /*      value is determined the same way as                              */
    /*      @FT_SIZE_REQUEST_TYPE_REAL_DIM does.  Finally, both scaling      */
    /*      values are set to the smaller one.  This type is useful if you   */
    /*      want to specify the font size for, say, a window of a given      */
    /*      dimension and 80x24 cells.                                       */
    /*                                                                       */
    /*    FT_SIZE_REQUEST_TYPE_SCALES ::                                     */
    /*      Specify the scaling values directly.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The above descriptions only apply to scalable formats.  For bitmap */
    /*    formats, the behaviour is up to the driver.                        */
    /*                                                                       */
    /*    See the note section of @FT_Size_Metrics if you wonder how size    */
    /*    requesting relates to scaling values.                              */
    /*                                                                       */
    typedef enum  FT_Size_Request_Type_
    {
      FT_SIZE_REQUEST_TYPE_NOMINAL,
      FT_SIZE_REQUEST_TYPE_REAL_DIM,
      FT_SIZE_REQUEST_TYPE_BBOX,
      FT_SIZE_REQUEST_TYPE_CELL,
      FT_SIZE_REQUEST_TYPE_SCALES,
  
      FT_SIZE_REQUEST_TYPE_MAX
  
    } FT_Size_Request_Type;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Struct>                                                              */
    /*    FT_Size_RequestRec                                                 */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A structure to model a size request.                               */
    /*                                                                       */
    /* <Fields>                                                              */
    /*    type           :: See @FT_Size_Request_Type.                       */
    /*                                                                       */
    /*    width          :: The desired width, given as a 26.6 fractional    */
    /*                      point value (with 72pt = 1in).                   */
    /*                                                                       */
    /*    height         :: The desired height, given as a 26.6 fractional   */
    /*                      point value (with 72pt = 1in).                   */
    /*                                                                       */
    /*    horiResolution :: The horizontal resolution (dpi, i.e., pixels per */
    /*                      inch).  If set to zero, `width' is treated as a  */
    /*                      26.6 fractional *pixel* value, which gets        */
    /*                      internally rounded to an integer.                */
    /*                                                                       */
    /*    vertResolution :: The vertical resolution (dpi, i.e., pixels per   */
    /*                      inch).  If set to zero, `height' is treated as a */
    /*                      26.6 fractional *pixel* value, which gets        */
    /*                      internally rounded to an integer.                */
    /*                                                                       */
    /* <Note>                                                                */
    /*    If `width' is zero, the horizontal scaling value is set equal      */
    /*    to the vertical scaling value, and vice versa.                     */
    /*                                                                       */
    /*    If `type' is FT_SIZE_REQUEST_TYPE_SCALES, `width' and `height' are */
    /*    interpreted directly as 16.16 fractional scaling values, without   */
    /*    any further modification, and both `horiResolution' and            */
    /*    `vertResolution' are ignored.                                      */
    /*                                                                       */
    typedef struct  FT_Size_RequestRec_
    {
      FT_Size_Request_Type  type;
      FT_Long               width;
      FT_Long               height;
      FT_UInt               horiResolution;
      FT_UInt               vertResolution;
  
    } FT_Size_RequestRec;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Struct>                                                              */
    /*    FT_Size_Request                                                    */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A handle to a size request structure.                              */
    /*                                                                       */
    typedef struct FT_Size_RequestRec_  *FT_Size_Request;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Request_Size                                                    */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Resize the scale of the active @FT_Size object in a face.          */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    face :: A handle to a target face object.                          */
    /*                                                                       */
    /* <Input>                                                               */
    /*    req  :: A pointer to a @FT_Size_RequestRec.                        */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Although drivers may select the bitmap strike matching the         */
    /*    request, you should not rely on this if you intend to select a     */
    /*    particular bitmap strike.  Use @FT_Select_Size instead in that     */
    /*    case.                                                              */
    /*                                                                       */
    /*    The relation between the requested size and the resulting glyph    */
    /*    size is dependent entirely on how the size is defined in the       */
    /*    source face.  The font designer chooses the final size of each     */
    /*    glyph relative to this size.  For more information refer to        */
    /*    `https://www.freetype.org/freetype2/docs/glyphs/glyphs-2.html'.    */
    /*                                                                       */
    /*    Contrary to @FT_Set_Char_Size, this function doesn't have special  */
    /*    code to normalize zero-valued widths, heights, or resolutions      */
    /*    (which lead to errors in most cases).                              */
    /*                                                                       */
    /*    Don't use this function if you are using the FreeType cache API.   */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Request_Size( FT_Face          face,
                     FT_Size_Request  req );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Set_Char_Size                                                   */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Call @FT_Request_Size to request the nominal size (in points).     */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    face            :: A handle to a target face object.               */
    /*                                                                       */
    /* <Input>                                                               */
    /*    char_width      :: The nominal width, in 26.6 fractional points.   */
    /*                                                                       */
    /*    char_height     :: The nominal height, in 26.6 fractional points.  */
    /*                                                                       */
    /*    horz_resolution :: The horizontal resolution in dpi.               */
    /*                                                                       */
    /*    vert_resolution :: The vertical resolution in dpi.                 */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    While this function allows fractional points as input values, the  */
    /*    resulting ppem value for the given resolution is always rounded to */
    /*    the nearest integer.                                               */
    /*                                                                       */
    /*    If either the character width or height is zero, it is set equal   */
    /*    to the other value.                                                */
    /*                                                                       */
    /*    If either the horizontal or vertical resolution is zero, it is set */
    /*    equal to the other value.                                          */
    /*                                                                       */
    /*    A character width or height smaller than 1pt is set to 1pt; if     */
    /*    both resolution values are zero, they are set to 72dpi.            */
    /*                                                                       */
    /*    Don't use this function if you are using the FreeType cache API.   */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Set_Char_Size( FT_Face     face,
                      FT_F26Dot6  char_width,
                      FT_F26Dot6  char_height,
                      FT_UInt     horz_resolution,
                      FT_UInt     vert_resolution );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Set_Pixel_Sizes                                                 */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Call @FT_Request_Size to request the nominal size (in pixels).     */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    face         :: A handle to the target face object.                */
    /*                                                                       */
    /* <Input>                                                               */
    /*    pixel_width  :: The nominal width, in pixels.                      */
    /*                                                                       */
    /*    pixel_height :: The nominal height, in pixels.                     */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    You should not rely on the resulting glyphs matching or being      */
    /*    constrained to this pixel size.  Refer to @FT_Request_Size to      */
    /*    understand how requested sizes relate to actual sizes.             */
    /*                                                                       */
    /*    Don't use this function if you are using the FreeType cache API.   */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Set_Pixel_Sizes( FT_Face  face,
                        FT_UInt  pixel_width,
                        FT_UInt  pixel_height );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Load_Glyph                                                      */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Load a glyph into the glyph slot of a face object.                 */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    face        :: A handle to the target face object where the glyph  */
    /*                   is loaded.                                          */
    /*                                                                       */
    /* <Input>                                                               */
    /*    glyph_index :: The index of the glyph in the font file.  For       */
    /*                   CID-keyed fonts (either in PS or in CFF format)     */
    /*                   this argument specifies the CID value.              */
    /*                                                                       */
    /*    load_flags  :: A flag indicating what to load for this glyph.  The */
    /*                   @FT_LOAD_XXX constants can be used to control the   */
    /*                   glyph loading process (e.g., whether the outline    */
    /*                   should be scaled, whether to load bitmaps or not,   */
    /*                   whether to hint the outline, etc).                  */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The loaded glyph may be transformed.  See @FT_Set_Transform for    */
    /*    the details.                                                       */
    /*                                                                       */
    /*    For subsetted CID-keyed fonts, `FT_Err_Invalid_Argument' is        */
    /*    returned for invalid CID values (this is, for CID values that      */
    /*    don't have a corresponding glyph in the font).  See the discussion */
    /*    of the @FT_FACE_FLAG_CID_KEYED flag for more details.              */
    /*                                                                       */
    /*    If you receive `FT_Err_Glyph_Too_Big', try getting the glyph       */
    /*    outline at EM size, then scale it manually and fill it as a        */
    /*    graphics operation.                                                */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Load_Glyph( FT_Face   face,
                   FT_UInt   glyph_index,
                   FT_Int32  load_flags );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Load_Char                                                       */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Load a glyph into the glyph slot of a face object, accessed by its */
    /*    character code.                                                    */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    face        :: A handle to a target face object where the glyph    */
    /*                   is loaded.                                          */
    /*                                                                       */
    /* <Input>                                                               */
    /*    char_code   :: The glyph's character code, according to the        */
    /*                   current charmap used in the face.                   */
    /*                                                                       */
    /*    load_flags  :: A flag indicating what to load for this glyph.  The */
    /*                   @FT_LOAD_XXX constants can be used to control the   */
    /*                   glyph loading process (e.g., whether the outline    */
    /*                   should be scaled, whether to load bitmaps or not,   */
    /*                   whether to hint the outline, etc).                  */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    This function simply calls @FT_Get_Char_Index and @FT_Load_Glyph.  */
    /*                                                                       */
    /*    Many fonts contain glyphs that can't be loaded by this function    */
    /*    since its glyph indices are not listed in any of the font's        */
    /*    charmaps.                                                          */
    /*                                                                       */
    /*    If no active cmap is set up (i.e., `face->charmap' is zero), the   */
    /*    call to @FT_Get_Char_Index is omitted, and the function behaves    */
    /*    identically to @FT_Load_Glyph.                                     */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Load_Char( FT_Face   face,
                  FT_ULong  char_code,
                  FT_Int32  load_flags );
  
  
    /*************************************************************************
     *
     * @enum:
     *   FT_LOAD_XXX
     *
     * @description:
     *   A list of bit field constants for @FT_Load_Glyph to indicate what
     *   kind of operations to perform during glyph loading.
     *
     * @values:
     *   FT_LOAD_DEFAULT ::
     *     Corresponding to~0, this value is used as the default glyph load
     *     operation.  In this case, the following happens:
     *
     *     1. FreeType looks for a bitmap for the glyph corresponding to the
     *        face's current size.  If one is found, the function returns.
     *        The bitmap data can be accessed from the glyph slot (see note
     *        below).
     *
     *     2. If no embedded bitmap is searched for or found, FreeType looks
     *        for a scalable outline.  If one is found, it is loaded from
     *        the font file, scaled to device pixels, then `hinted' to the
     *        pixel grid in order to optimize it.  The outline data can be
     *        accessed from the glyph slot (see note below).
     *
     *     Note that by default the glyph loader doesn't render outlines into
     *     bitmaps.  The following flags are used to modify this default
     *     behaviour to more specific and useful cases.
     *
     *   FT_LOAD_NO_SCALE ::
     *     Don't scale the loaded outline glyph but keep it in font units.
     *
     *     This flag implies @FT_LOAD_NO_HINTING and @FT_LOAD_NO_BITMAP, and
     *     unsets @FT_LOAD_RENDER.
     *
     *     If the font is `tricky' (see @FT_FACE_FLAG_TRICKY for more), using
     *     FT_LOAD_NO_SCALE usually yields meaningless outlines because the
     *     subglyphs must be scaled and positioned with hinting instructions.
     *     This can be solved by loading the font without FT_LOAD_NO_SCALE and
     *     setting the character size to `font->units_per_EM'.
     *
     *   FT_LOAD_NO_HINTING ::
     *     Disable hinting.  This generally generates `blurrier' bitmap glyphs
     *     when the glyph are rendered in any of the anti-aliased modes.  See
     *     also the note below.
     *
     *     This flag is implied by @FT_LOAD_NO_SCALE.
     *
     *   FT_LOAD_RENDER ::
     *     Call @FT_Render_Glyph after the glyph is loaded.  By default, the
     *     glyph is rendered in @FT_RENDER_MODE_NORMAL mode.  This can be
     *     overridden by @FT_LOAD_TARGET_XXX or @FT_LOAD_MONOCHROME.
     *
     *     This flag is unset by @FT_LOAD_NO_SCALE.
     *
     *   FT_LOAD_NO_BITMAP ::
     *     Ignore bitmap strikes when loading.  Bitmap-only fonts ignore this
     *     flag.
     *
     *     @FT_LOAD_NO_SCALE always sets this flag.
     *
     *   FT_LOAD_VERTICAL_LAYOUT ::
     *     Load the glyph for vertical text layout.  In particular, the
     *     `advance' value in the @FT_GlyphSlotRec structure is set to the
     *     `vertAdvance' value of the `metrics' field.
     *
     *     In case @FT_HAS_VERTICAL doesn't return true, you shouldn't use
     *     this flag currently.  Reason is that in this case vertical metrics
     *     get synthesized, and those values are not always consistent across
     *     various font formats.
     *
     *   FT_LOAD_FORCE_AUTOHINT ::
     *     Prefer the auto-hinter over the font's native hinter.  See also
     *     the note below.
     *
     *   FT_LOAD_PEDANTIC ::
     *     Make the font driver perform pedantic verifications during glyph
     *     loading.  This is mostly used to detect broken glyphs in fonts.
     *     By default, FreeType tries to handle broken fonts also.
     *
     *     In particular, errors from the TrueType bytecode engine are not
     *     passed to the application if this flag is not set; this might
     *     result in partially hinted or distorted glyphs in case a glyph's
     *     bytecode is buggy.
     *
     *   FT_LOAD_NO_RECURSE ::
     *     Don't load composite glyphs recursively.  Instead, the font
     *     driver should set the `num_subglyph' and `subglyphs' values of
     *     the glyph slot accordingly, and set `glyph->format' to
     *     @FT_GLYPH_FORMAT_COMPOSITE.  The description of subglyphs can
     *     then be accessed with @FT_Get_SubGlyph_Info.
     *
     *     This flag implies @FT_LOAD_NO_SCALE and @FT_LOAD_IGNORE_TRANSFORM.
     *
     *   FT_LOAD_IGNORE_TRANSFORM ::
     *     Ignore the transform matrix set by @FT_Set_Transform.
     *
     *   FT_LOAD_MONOCHROME ::
     *     This flag is used with @FT_LOAD_RENDER to indicate that you want to
     *     render an outline glyph to a 1-bit monochrome bitmap glyph, with
     *     8~pixels packed into each byte of the bitmap data.
     *
     *     Note that this has no effect on the hinting algorithm used.  You
     *     should rather use @FT_LOAD_TARGET_MONO so that the
     *     monochrome-optimized hinting algorithm is used.
     *
     *   FT_LOAD_LINEAR_DESIGN ::
     *     Keep  `linearHoriAdvance' and `linearVertAdvance' fields of
     *     @FT_GlyphSlotRec in font units.  See @FT_GlyphSlotRec for
     *     details.
     *
     *   FT_LOAD_NO_AUTOHINT ::
     *     Disable the auto-hinter.  See also the note below.
     *
     *   FT_LOAD_COLOR ::
     *     [Since 2.5] Load embedded color bitmap images.  The resulting color
     *     bitmaps, if available, will have the @FT_PIXEL_MODE_BGRA format.
     *     If the flag is not set and color bitmaps are found, they are
     *     converted to 256-level gray bitmaps transparently, using the
     *     @FT_PIXEL_MODE_GRAY format.
     *
     *   FT_LOAD_COMPUTE_METRICS ::
     *     [Since 2.6.1] Compute glyph metrics from the glyph data, without
     *     the use of bundled metrics tables (for example, the `hdmx' table in
     *     TrueType fonts).  This flag is mainly used by font validating or
     *     font editing applications, which need to ignore, verify, or edit
     *     those tables.
     *
     *     Currently, this flag is only implemented for TrueType fonts.
     *
     *   FT_LOAD_BITMAP_METRICS_ONLY ::
     *     [Since 2.7.1] Request loading of the metrics and bitmap image
     *     information of a (possibly embedded) bitmap glyph without
     *     allocating or copying the bitmap image data itself.  No effect if
     *     the target glyph is not a bitmap image.
     *
     *     This flag unsets @FT_LOAD_RENDER.
     *
     *   FT_LOAD_CROP_BITMAP ::
     *     Ignored.  Deprecated.
     *
     *   FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ::
     *     Ignored.  Deprecated.
     *
     * @note:
     *   By default, hinting is enabled and the font's native hinter (see
     *   @FT_FACE_FLAG_HINTER) is preferred over the auto-hinter.  You can
     *   disable hinting by setting @FT_LOAD_NO_HINTING or change the
     *   precedence by setting @FT_LOAD_FORCE_AUTOHINT.  You can also set
     *   @FT_LOAD_NO_AUTOHINT in case you don't want the auto-hinter to be
     *   used at all.
     *
     *   See the description of @FT_FACE_FLAG_TRICKY for a special exception
     *   (affecting only a handful of Asian fonts).
     *
     *   Besides deciding which hinter to use, you can also decide which
     *   hinting algorithm to use.  See @FT_LOAD_TARGET_XXX for details.
     *
     *   Note that the auto-hinter needs a valid Unicode cmap (either a native
     *   one or synthesized by FreeType) for producing correct results.  If a
     *   font provides an incorrect mapping (for example, assigning the
     *   character code U+005A, LATIN CAPITAL LETTER Z, to a glyph depicting a
     *   mathematical integral sign), the auto-hinter might produce useless
     *   results.
     *
     */
  #define FT_LOAD_DEFAULT                      0x0
  #define FT_LOAD_NO_SCALE                     ( 1L << 0 )
  #define FT_LOAD_NO_HINTING                   ( 1L << 1 )
  #define FT_LOAD_RENDER                       ( 1L << 2 )
  #define FT_LOAD_NO_BITMAP                    ( 1L << 3 )
  #define FT_LOAD_VERTICAL_LAYOUT              ( 1L << 4 )
  #define FT_LOAD_FORCE_AUTOHINT               ( 1L << 5 )
  #define FT_LOAD_CROP_BITMAP                  ( 1L << 6 )
  #define FT_LOAD_PEDANTIC                     ( 1L << 7 )
  #define FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH  ( 1L << 9 )
  #define FT_LOAD_NO_RECURSE                   ( 1L << 10 )
  #define FT_LOAD_IGNORE_TRANSFORM             ( 1L << 11 )
  #define FT_LOAD_MONOCHROME                   ( 1L << 12 )
  #define FT_LOAD_LINEAR_DESIGN                ( 1L << 13 )
  #define FT_LOAD_NO_AUTOHINT                  ( 1L << 15 )
    /* Bits 16-19 are used by `FT_LOAD_TARGET_' */
  #define FT_LOAD_COLOR                        ( 1L << 20 )
  #define FT_LOAD_COMPUTE_METRICS              ( 1L << 21 )
  #define FT_LOAD_BITMAP_METRICS_ONLY          ( 1L << 22 )
  
    /* */
  
    /* used internally only by certain font drivers */
  #define FT_LOAD_ADVANCE_ONLY                 ( 1L << 8 )
  #define FT_LOAD_SBITS_ONLY                   ( 1L << 14 )
  
  
    /**************************************************************************
     *
     * @enum:
     *   FT_LOAD_TARGET_XXX
     *
     * @description:
     *   A list of values to select a specific hinting algorithm for the
     *   hinter.  You should OR one of these values to your `load_flags'
     *   when calling @FT_Load_Glyph.
     *
     *   Note that a font's native hinters may ignore the hinting algorithm
     *   you have specified (e.g., the TrueType bytecode interpreter).  You
     *   can set @FT_LOAD_FORCE_AUTOHINT to ensure that the auto-hinter is
     *   used.
     *
     * @values:
     *   FT_LOAD_TARGET_NORMAL ::
     *     The default hinting algorithm, optimized for standard gray-level
     *     rendering.  For monochrome output, use @FT_LOAD_TARGET_MONO
     *     instead.
     *
     *   FT_LOAD_TARGET_LIGHT ::
     *     A lighter hinting algorithm for gray-level modes.  Many generated
     *     glyphs are fuzzier but better resemble their original shape.  This
     *     is achieved by snapping glyphs to the pixel grid only vertically
     *     (Y-axis), as is done by FreeType's new CFF engine or Microsoft's
     *     ClearType font renderer.  This preserves inter-glyph spacing in
     *     horizontal text.  The snapping is done either by the native font
     *     driver, if the driver itself and the font support it, or by the
     *     auto-hinter.
     *
     *     Advance widths are rounded to integer values; however, using the
     *     `lsb_delta' and `rsb_delta' fields of @FT_GlyphSlotRec, it is
     *     possible to get fractional advance widths for subpixel positioning
     *     (which is recommended to use).
     *
     *     If configuration option AF_CONFIG_OPTION_TT_SIZE_METRICS is active,
     *     TrueType-like metrics are used to make this mode behave similarly
     *     as in unpatched FreeType versions between 2.4.6 and 2.7.1
     *     (inclusive).
     *
     *   FT_LOAD_TARGET_MONO ::
     *     Strong hinting algorithm that should only be used for monochrome
     *     output.  The result is probably unpleasant if the glyph is rendered
     *     in non-monochrome modes.
     *
     *   FT_LOAD_TARGET_LCD ::
     *     A variant of @FT_LOAD_TARGET_LIGHT optimized for horizontally
     *     decimated LCD displays.
     *
     *   FT_LOAD_TARGET_LCD_V ::
     *     A variant of @FT_LOAD_TARGET_NORMAL optimized for vertically
     *     decimated LCD displays.
     *
     * @note:
     *   You should use only _one_ of the FT_LOAD_TARGET_XXX values in your
     *   `load_flags'.  They can't be ORed.
     *
     *   If @FT_LOAD_RENDER is also set, the glyph is rendered in the
     *   corresponding mode (i.e., the mode that matches the used algorithm
     *   best).  An exception is FT_LOAD_TARGET_MONO since it implies
     *   @FT_LOAD_MONOCHROME.
     *
     *   You can use a hinting algorithm that doesn't correspond to the same
     *   rendering mode.  As an example, it is possible to use the `light'
     *   hinting algorithm and have the results rendered in horizontal LCD
     *   pixel mode, with code like
     *
     *     {
     *       FT_Load_Glyph( face, glyph_index,
     *                      load_flags | FT_LOAD_TARGET_LIGHT );
     *
     *       FT_Render_Glyph( face->glyph, FT_RENDER_MODE_LCD );
     *     }
     *
     *   In general, you should stick with one rendering mode.  For example,
     *   switching between @FT_LOAD_TARGET_NORMAL and @FT_LOAD_TARGET_MONO
     *   enforces a lot of recomputation for TrueType fonts, which is slow.
     *   Another reason is caching: Selecting a different mode usually causes
     *   changes in both the outlines and the rasterized bitmaps; it is thus
     *   necessary to empty the cache after a mode switch to avoid false hits.
     *
     */
  #define FT_LOAD_TARGET_( x )   ( (FT_Int32)( (x) & 15 ) << 16 )
  
  #define FT_LOAD_TARGET_NORMAL  FT_LOAD_TARGET_( FT_RENDER_MODE_NORMAL )
  #define FT_LOAD_TARGET_LIGHT   FT_LOAD_TARGET_( FT_RENDER_MODE_LIGHT  )
  #define FT_LOAD_TARGET_MONO    FT_LOAD_TARGET_( FT_RENDER_MODE_MONO   )
  #define FT_LOAD_TARGET_LCD     FT_LOAD_TARGET_( FT_RENDER_MODE_LCD    )
  #define FT_LOAD_TARGET_LCD_V   FT_LOAD_TARGET_( FT_RENDER_MODE_LCD_V  )
  
  
    /**************************************************************************
     *
     * @macro:
     *   FT_LOAD_TARGET_MODE
     *
     * @description:
     *   Return the @FT_Render_Mode corresponding to a given
     *   @FT_LOAD_TARGET_XXX value.
     *
     */
  #define FT_LOAD_TARGET_MODE( x )  ( (FT_Render_Mode)( ( (x) >> 16 ) & 15 ) )
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Set_Transform                                                   */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Set the transformation that is applied to glyph images when they   */
    /*    are loaded into a glyph slot through @FT_Load_Glyph.               */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    face   :: A handle to the source face object.                      */
    /*                                                                       */
    /* <Input>                                                               */
    /*    matrix :: A pointer to the transformation's 2x2 matrix.  Use NULL  */
    /*              for the identity matrix.                                 */
    /*    delta  :: A pointer to the translation vector.  Use NULL for the   */
    /*              null vector.                                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The transformation is only applied to scalable image formats after */
    /*    the glyph has been loaded.  It means that hinting is unaltered by  */
    /*    the transformation and is performed on the character size given in */
    /*    the last call to @FT_Set_Char_Size or @FT_Set_Pixel_Sizes.         */
    /*                                                                       */
    /*    Note that this also transforms the `face.glyph.advance' field, but */
    /*    *not* the values in `face.glyph.metrics'.                          */
    /*                                                                       */
    FT_EXPORT( void )
    FT_Set_Transform( FT_Face     face,
                      FT_Matrix*  matrix,
                      FT_Vector*  delta );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Enum>                                                                */
    /*    FT_Render_Mode                                                     */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Render modes supported by FreeType~2.  Each mode corresponds to a  */
    /*    specific type of scanline conversion performed on the outline.     */
    /*                                                                       */
    /*    For bitmap fonts and embedded bitmaps the `bitmap->pixel_mode'     */
    /*    field in the @FT_GlyphSlotRec structure gives the format of the    */
    /*    returned bitmap.                                                   */
    /*                                                                       */
    /*    All modes except @FT_RENDER_MODE_MONO use 256 levels of opacity,   */
    /*    indicating pixel coverage.  Use linear alpha blending and gamma    */
    /*    correction to correctly render non-monochrome glyph bitmaps onto a */
    /*    surface; see @FT_Render_Glyph.                                     */
    /*                                                                       */
    /* <Values>                                                              */
    /*    FT_RENDER_MODE_NORMAL ::                                           */
    /*      Default render mode; it corresponds to 8-bit anti-aliased        */
    /*      bitmaps.                                                         */
    /*                                                                       */
    /*    FT_RENDER_MODE_LIGHT ::                                            */
    /*      This is equivalent to @FT_RENDER_MODE_NORMAL.  It is only        */
    /*      defined as a separate value because render modes are also used   */
    /*      indirectly to define hinting algorithm selectors.  See           */
    /*      @FT_LOAD_TARGET_XXX for details.                                 */
    /*                                                                       */
    /*    FT_RENDER_MODE_MONO ::                                             */
    /*      This mode corresponds to 1-bit bitmaps (with 2~levels of         */
    /*      opacity).                                                        */
    /*                                                                       */
    /*    FT_RENDER_MODE_LCD ::                                              */
    /*      This mode corresponds to horizontal RGB and BGR subpixel         */
    /*      displays like LCD screens.  It produces 8-bit bitmaps that are   */
    /*      3~times the width of the original glyph outline in pixels, and   */
    /*      which use the @FT_PIXEL_MODE_LCD mode.                           */
    /*                                                                       */
    /*    FT_RENDER_MODE_LCD_V ::                                            */
    /*      This mode corresponds to vertical RGB and BGR subpixel displays  */
    /*      (like PDA screens, rotated LCD displays, etc.).  It produces     */
    /*      8-bit bitmaps that are 3~times the height of the original        */
    /*      glyph outline in pixels and use the @FT_PIXEL_MODE_LCD_V mode.   */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Should you define FT_CONFIG_OPTION_SUBPIXEL_RENDERING in your      */
    /*    `ftoption.h', which enables patented ClearType-style rendering,    */
    /*    the LCD-optimized glyph bitmaps should be filtered to reduce color */
    /*    fringes inherent to this technology.  You can either set up LCD    */
    /*    filtering with @FT_Library_SetLcdFilter or @FT_Face_Properties,    */
    /*    or do the filtering yourself.  The default FreeType LCD rendering  */
    /*    technology does not require filtering.                             */
    /*                                                                       */
    /*    The selected render mode only affects vector glyphs of a font.     */
    /*    Embedded bitmaps often have a different pixel mode like            */
    /*    @FT_PIXEL_MODE_MONO.  You can use @FT_Bitmap_Convert to transform  */
    /*    them into 8-bit pixmaps.                                           */
    /*                                                                       */
    typedef enum  FT_Render_Mode_
    {
      FT_RENDER_MODE_NORMAL = 0,
      FT_RENDER_MODE_LIGHT,
      FT_RENDER_MODE_MONO,
      FT_RENDER_MODE_LCD,
      FT_RENDER_MODE_LCD_V,
  
      FT_RENDER_MODE_MAX
  
    } FT_Render_Mode;
  
  
    /* these constants are deprecated; use the corresponding */
    /* `FT_Render_Mode' values instead                       */
  #define ft_render_mode_normal  FT_RENDER_MODE_NORMAL
  #define ft_render_mode_mono    FT_RENDER_MODE_MONO
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Render_Glyph                                                    */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Convert a given glyph image to a bitmap.  It does so by inspecting */
    /*    the glyph image format, finding the relevant renderer, and         */
    /*    invoking it.                                                       */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    slot        :: A handle to the glyph slot containing the image to  */
    /*                   convert.                                            */
    /*                                                                       */
    /* <Input>                                                               */
    /*    render_mode :: The render mode used to render the glyph image into */
    /*                   a bitmap.  See @FT_Render_Mode for a list of        */
    /*                   possible values.                                    */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    To get meaningful results, font scaling values must be set with    */
    /*    functions like @FT_Set_Char_Size before calling `FT_Render_Glyph'. */
    /*                                                                       */
    /*    When FreeType outputs a bitmap of a glyph, it really outputs an    */
    /*    alpha coverage map.  If a pixel is completely covered by a         */
    /*    filled-in outline, the bitmap contains 0xFF at that pixel, meaning */
    /*    that 0xFF/0xFF fraction of that pixel is covered, meaning the      */
    /*    pixel is 100% black (or 0% bright).  If a pixel is only 50%        */
    /*    covered (value 0x80), the pixel is made 50% black (50% bright or a */
    /*    middle shade of grey).  0% covered means 0% black (100% bright or  */
    /*    white).                                                            */
    /*                                                                       */
    /*    On high-DPI screens like on smartphones and tablets, the pixels    */
    /*    are so small that their chance of being completely covered and     */
    /*    therefore completely black are fairly good.  On the low-DPI        */
    /*    screens, however, the situation is different.  The pixels are too  */
    /*    large for most of the details of a glyph and shades of gray are    */
    /*    the norm rather than the exception.                                */
    /*                                                                       */
    /*    This is relevant because all our screens have a second problem:    */
    /*    they are not linear.  1~+~1 is not~2.  Twice the value does not    */
    /*    result in twice the brightness.  When a pixel is only 50% covered, */
    /*    the coverage map says 50% black, and this translates to a pixel    */
    /*    value of 128 when you use 8~bits per channel (0-255).  However,    */
    /*    this does not translate to 50% brightness for that pixel on our    */
    /*    sRGB and gamma~2.2 screens.  Due to their non-linearity, they      */
    /*    dwell longer in the darks and only a pixel value of about 186      */
    /*    results in 50% brightness -- 128 ends up too dark on both bright   */
    /*    and dark backgrounds.  The net result is that dark text looks      */
    /*    burnt-out, pixely and blotchy on bright background, bright text    */
    /*    too frail on dark backgrounds, and colored text on colored         */
    /*    background (for example, red on green) seems to have dark halos or */
    /*    `dirt' around it.  The situation is especially ugly for diagonal   */
    /*    stems like in `w' glyph shapes where the quality of FreeType's     */
    /*    anti-aliasing depends on the correct display of grays.  On         */
    /*    high-DPI screens where smaller, fully black pixels reign supreme,  */
    /*    this doesn't matter, but on our low-DPI screens with all the gray  */
    /*    shades, it does.  0% and 100% brightness are the same things in    */
    /*    linear and non-linear space, just all the shades in-between        */
    /*    aren't.                                                            */
    /*                                                                       */
    /*    The blending function for placing text over a background is        */
    /*                                                                       */
    /*    {                                                                  */
    /*      dst = alpha * src + (1 - alpha) * dst    ,                       */
    /*    }                                                                  */
    /*                                                                       */
    /*    which is known as the OVER operator.                               */
    /*                                                                       */
    /*    To correctly composite an antialiased pixel of a glyph onto a      */
    /*    surface,                                                           */
    /*                                                                       */
    /*    1. take the foreground and background colors (e.g., in sRGB space) */
    /*       and apply gamma to get them in a linear space,                  */
    /*                                                                       */
    /*    2. use OVER to blend the two linear colors using the glyph pixel   */
    /*       as the alpha value (remember, the glyph bitmap is an alpha      */
    /*       coverage bitmap), and                                           */
    /*                                                                       */
    /*    3. apply inverse gamma to the blended pixel and write it back to   */
    /*       the image.                                                      */
    /*                                                                       */
    /*    Internal testing at Adobe found that a target inverse gamma of~1.8 */
    /*    for step~3 gives good results across a wide range of displays with */
    /*    an sRGB gamma curve or a similar one.                              */
    /*                                                                       */
    /*    This process can cost performance.  There is an approximation that */
    /*    does not need to know about the background color; see              */
    /*    https://bel.fi/alankila/lcd/ and                                   */
    /*    https://bel.fi/alankila/lcd/alpcor.html for details.               */
    /*                                                                       */
    /*    *ATTENTION*: Linear blending is even more important when dealing   */
    /*    with subpixel-rendered glyphs to prevent color-fringing!  A        */
    /*    subpixel-rendered glyph must first be filtered with a filter that  */
    /*    gives equal weight to the three color primaries and does not       */
    /*    exceed a sum of 0x100, see section @lcd_filtering.  Then the       */
    /*    only difference to gray linear blending is that subpixel-rendered  */
    /*    linear blending is done 3~times per pixel: red foreground subpixel */
    /*    to red background subpixel and so on for green and blue.           */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Render_Glyph( FT_GlyphSlot    slot,
                     FT_Render_Mode  render_mode );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Enum>                                                                */
    /*    FT_Kerning_Mode                                                    */
    /*                                                                       */
    /* <Description>                                                         */
    /*    An enumeration to specify the format of kerning values returned by */
    /*    @FT_Get_Kerning.                                                   */
    /*                                                                       */
    /* <Values>                                                              */
    /*    FT_KERNING_DEFAULT  :: Return grid-fitted kerning distances in     */
    /*                           26.6 fractional pixels.                     */
    /*                                                                       */
    /*    FT_KERNING_UNFITTED :: Return un-grid-fitted kerning distances in  */
    /*                           26.6 fractional pixels.                     */
    /*                                                                       */
    /*    FT_KERNING_UNSCALED :: Return the kerning vector in original font  */
    /*                           units.                                      */
    /*                                                                       */
    /* <Note>                                                                */
    /*    FT_KERNING_DEFAULT returns full pixel values; it also makes        */
    /*    FreeType heuristically scale down kerning distances at small ppem  */
    /*    values so that they don't become too big.                          */
    /*                                                                       */
    /*    Both FT_KERNING_DEFAULT and FT_KERNING_UNFITTED use the current    */
    /*    horizontal scaling factor (as set e.g. with @FT_Set_Char_Size) to  */
    /*    convert font units to pixels.                                      */
    /*                                                                       */
    typedef enum  FT_Kerning_Mode_
    {
      FT_KERNING_DEFAULT = 0,
      FT_KERNING_UNFITTED,
      FT_KERNING_UNSCALED
  
    } FT_Kerning_Mode;
  
  
    /* these constants are deprecated; use the corresponding */
    /* `FT_Kerning_Mode' values instead                      */
  #define ft_kerning_default   FT_KERNING_DEFAULT
  #define ft_kerning_unfitted  FT_KERNING_UNFITTED
  #define ft_kerning_unscaled  FT_KERNING_UNSCALED
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Get_Kerning                                                     */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Return the kerning vector between two glyphs of the same face.     */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face        :: A handle to a source face object.                   */
    /*                                                                       */
    /*    left_glyph  :: The index of the left glyph in the kern pair.       */
    /*                                                                       */
    /*    right_glyph :: The index of the right glyph in the kern pair.      */
    /*                                                                       */
    /*    kern_mode   :: See @FT_Kerning_Mode for more information.          */
    /*                   Determines the scale and dimension of the returned  */
    /*                   kerning vector.                                     */
    /*                                                                       */
    /* <Output>                                                              */
    /*    akerning    :: The kerning vector.  This is either in font units,  */
    /*                   fractional pixels (26.6 format), or pixels for      */
    /*                   scalable formats, and in pixels for fixed-sizes     */
    /*                   formats.                                            */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Only horizontal layouts (left-to-right & right-to-left) are        */
    /*    supported by this method.  Other layouts, or more sophisticated    */
    /*    kernings, are out of the scope of this API function -- they can be */
    /*    implemented through format-specific interfaces.                    */
    /*                                                                       */
    /*    Kerning for OpenType fonts implemented in a `GPOS' table is not    */
    /*    supported; use @FT_HAS_KERNING to find out whether a font has data */
    /*    that can be extracted with `FT_Get_Kerning'.                       */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Get_Kerning( FT_Face     face,
                    FT_UInt     left_glyph,
                    FT_UInt     right_glyph,
                    FT_UInt     kern_mode,
                    FT_Vector  *akerning );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Get_Track_Kerning                                               */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Return the track kerning for a given face object at a given size.  */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face       :: A handle to a source face object.                    */
    /*                                                                       */
    /*    point_size :: The point size in 16.16 fractional points.           */
    /*                                                                       */
    /*    degree     :: The degree of tightness.  Increasingly negative      */
    /*                  values represent tighter track kerning, while        */
    /*                  increasingly positive values represent looser track  */
    /*                  kerning.  Value zero means no track kerning.         */
    /*                                                                       */
    /* <Output>                                                              */
    /*    akerning   :: The kerning in 16.16 fractional points, to be        */
    /*                  uniformly applied between all glyphs.                */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Currently, only the Type~1 font driver supports track kerning,     */
    /*    using data from AFM files (if attached with @FT_Attach_File or     */
    /*    @FT_Attach_Stream).                                                */
    /*                                                                       */
    /*    Only very few AFM files come with track kerning data; please refer */
    /*    to Adobe's AFM specification for more details.                     */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Get_Track_Kerning( FT_Face    face,
                          FT_Fixed   point_size,
                          FT_Int     degree,
                          FT_Fixed*  akerning );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Get_Glyph_Name                                                  */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Retrieve the ASCII name of a given glyph in a face.  This only     */
    /*    works for those faces where @FT_HAS_GLYPH_NAMES(face) returns~1.   */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face        :: A handle to a source face object.                   */
    /*                                                                       */
    /*    glyph_index :: The glyph index.                                    */
    /*                                                                       */
    /*    buffer_max  :: The maximum number of bytes available in the        */
    /*                   buffer.                                             */
    /*                                                                       */
    /* <Output>                                                              */
    /*    buffer      :: A pointer to a target buffer where the name is      */
    /*                   copied to.                                          */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    An error is returned if the face doesn't provide glyph names or if */
    /*    the glyph index is invalid.  In all cases of failure, the first    */
    /*    byte of `buffer' is set to~0 to indicate an empty name.            */
    /*                                                                       */
    /*    The glyph name is truncated to fit within the buffer if it is too  */
    /*    long.  The returned string is always zero-terminated.              */
    /*                                                                       */
    /*    Be aware that FreeType reorders glyph indices internally so that   */
    /*    glyph index~0 always corresponds to the `missing glyph' (called    */
    /*    `.notdef').                                                        */
    /*                                                                       */
    /*    This function always returns an error if the config macro          */
    /*    `FT_CONFIG_OPTION_NO_GLYPH_NAMES' is not defined in `ftoption.h'.  */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Get_Glyph_Name( FT_Face     face,
                       FT_UInt     glyph_index,
                       FT_Pointer  buffer,
                       FT_UInt     buffer_max );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Get_Postscript_Name                                             */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Retrieve the ASCII PostScript name of a given face, if available.  */
    /*    This only works with PostScript, TrueType, and OpenType fonts.     */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face :: A handle to the source face object.                        */
    /*                                                                       */
    /* <Return>                                                              */
    /*    A pointer to the face's PostScript name.  NULL if unavailable.     */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The returned pointer is owned by the face and is destroyed with    */
    /*    it.                                                                */
    /*                                                                       */
    /*    For variation fonts, this string changes if you select a different */
    /*    instance, and you have to call `FT_Get_PostScript_Name' again to   */
    /*    retrieve it.  FreeType follows Adobe TechNote #5902, `Generating   */
    /*    PostScript Names for Fonts Using OpenType Font Variations'.        */
    /*                                                                       */
    /*      https://download.macromedia.com/pub/developer/opentype/tech-notes/5902.AdobePSNameGeneration.html */
    /*                                                                       */
    /*    [Since 2.9] Special PostScript names for named instances are only  */
    /*    returned if the named instance is set with @FT_Set_Named_Instance  */
    /*    (and the font has corresponding entries in its `fvar' table).  If  */
    /*    @FT_IS_VARIATION returns true, the algorithmically derived         */
    /*    PostScript name is provided, not looking up special entries for    */
    /*    named instances.                                                   */
    /*                                                                       */
    FT_EXPORT( const char* )
    FT_Get_Postscript_Name( FT_Face  face );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Select_Charmap                                                  */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Select a given charmap by its encoding tag (as listed in           */
    /*    `freetype.h').                                                     */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    face     :: A handle to the source face object.                    */
    /*                                                                       */
    /* <Input>                                                               */
    /*    encoding :: A handle to the selected encoding.                     */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    This function returns an error if no charmap in the face           */
    /*    corresponds to the encoding queried here.                          */
    /*                                                                       */
    /*    Because many fonts contain more than a single cmap for Unicode     */
    /*    encoding, this function has some special code to select the one    */
    /*    that covers Unicode best (`best' in the sense that a UCS-4 cmap is */
    /*    preferred to a UCS-2 cmap).  It is thus preferable to              */
    /*    @FT_Set_Charmap in this case.                                      */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Select_Charmap( FT_Face      face,
                       FT_Encoding  encoding );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Set_Charmap                                                     */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Select a given charmap for character code to glyph index mapping.  */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    face    :: A handle to the source face object.                     */
    /*                                                                       */
    /* <Input>                                                               */
    /*    charmap :: A handle to the selected charmap.                       */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0~means success.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    This function returns an error if the charmap is not part of       */
    /*    the face (i.e., if it is not listed in the `face->charmaps'        */
    /*    table).                                                            */
    /*                                                                       */
    /*    It also fails if an OpenType type~14 charmap is selected (which    */
    /*    doesn't map character codes to glyph indices at all).              */
    /*                                                                       */
    FT_EXPORT( FT_Error )
    FT_Set_Charmap( FT_Face     face,
                    FT_CharMap  charmap );
  
  
    /*************************************************************************
     *
     * @function:
     *   FT_Get_Charmap_Index
     *
     * @description:
     *   Retrieve index of a given charmap.
     *
     * @input:
     *   charmap ::
     *     A handle to a charmap.
     *
     * @return:
     *   The index into the array of character maps within the face to which
     *   `charmap' belongs.  If an error occurs, -1 is returned.
     *
     */
    FT_EXPORT( FT_Int )
    FT_Get_Charmap_Index( FT_CharMap  charmap );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Get_Char_Index                                                  */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Return the glyph index of a given character code.  This function   */
    /*    uses the currently selected charmap to do the mapping.             */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face     :: A handle to the source face object.                    */
    /*                                                                       */
    /*    charcode :: The character code.                                    */
    /*                                                                       */
    /* <Return>                                                              */
    /*    The glyph index.  0~means `undefined character code'.              */
    /*                                                                       */
    /* <Note>                                                                */
    /*    If you use FreeType to manipulate the contents of font files       */
    /*    directly, be aware that the glyph index returned by this function  */
    /*    doesn't always correspond to the internal indices used within the  */
    /*    file.  This is done to ensure that value~0 always corresponds to   */
    /*    the `missing glyph'.  If the first glyph is not named `.notdef',   */
    /*    then for Type~1 and Type~42 fonts, `.notdef' will be moved into    */
    /*    the glyph ID~0 position, and whatever was there will be moved to   */
    /*    the position `.notdef' had.  For Type~1 fonts, if there is no      */
    /*    `.notdef' glyph at all, then one will be created at index~0 and    */
    /*    whatever was there will be moved to the last index -- Type~42      */
    /*    fonts are considered invalid under this condition.                 */
    /*                                                                       */
    FT_EXPORT( FT_UInt )
    FT_Get_Char_Index( FT_Face   face,
                       FT_ULong  charcode );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Get_First_Char                                                  */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Return the first character code in the current charmap of a given  */
    /*    face, together with its corresponding glyph index.                 */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face    :: A handle to the source face object.                     */
    /*                                                                       */
    /* <Output>                                                              */
    /*    agindex :: Glyph index of first character code.  0~if charmap is   */
    /*               empty.                                                  */
    /*                                                                       */
    /* <Return>                                                              */
    /*    The charmap's first character code.                                */
    /*                                                                       */
    /* <Note>                                                                */
    /*    You should use this function together with @FT_Get_Next_Char to    */
    /*    parse all character codes available in a given charmap.  The code  */
    /*    should look like this:                                             */
    /*                                                                       */
    /*    {                                                                  */
    /*      FT_ULong  charcode;                                              */
    /*      FT_UInt   gindex;                                                */
    /*                                                                       */
    /*                                                                       */
    /*      charcode = FT_Get_First_Char( face, &gindex );                   */
    /*      while ( gindex != 0 )                                            */
    /*      {                                                                */
    /*        ... do something with (charcode,gindex) pair ...               */
    /*                                                                       */
    /*        charcode = FT_Get_Next_Char( face, charcode, &gindex );        */
    /*      }                                                                */
    /*    }                                                                  */
    /*                                                                       */
    /*    Be aware that character codes can have values up to 0xFFFFFFFF;    */
    /*    this might happen for non-Unicode or malformed cmaps.  However,    */
    /*    even with regular Unicode encoding, so-called `last resort fonts'  */
    /*    (using SFNT cmap format 13, see function @FT_Get_CMap_Format)      */
    /*    normally have entries for all Unicode characters up to 0x1FFFFF,   */
    /*    which can cause *a lot* of iterations.                             */
    /*                                                                       */
    /*    Note that `*agindex' is set to~0 if the charmap is empty.  The     */
    /*    result itself can be~0 in two cases: if the charmap is empty or    */
    /*    if the value~0 is the first valid character code.                  */
    /*                                                                       */
    FT_EXPORT( FT_ULong )
    FT_Get_First_Char( FT_Face   face,
                       FT_UInt  *agindex );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Get_Next_Char                                                   */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Return the next character code in the current charmap of a given   */
    /*    face following the value `char_code', as well as the corresponding */
    /*    glyph index.                                                       */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face      :: A handle to the source face object.                   */
    /*                                                                       */
    /*    char_code :: The starting character code.                          */
    /*                                                                       */
    /* <Output>                                                              */
    /*    agindex   :: Glyph index of next character code.  0~if charmap     */
    /*                 is empty.                                             */
    /*                                                                       */
    /* <Return>                                                              */
    /*    The charmap's next character code.                                 */
    /*                                                                       */
    /* <Note>                                                                */
    /*    You should use this function with @FT_Get_First_Char to walk       */
    /*    over all character codes available in a given charmap.  See the    */
    /*    note for that function for a simple code example.                  */
    /*                                                                       */
    /*    Note that `*agindex' is set to~0 when there are no more codes in   */
    /*    the charmap.                                                       */
    /*                                                                       */
    FT_EXPORT( FT_ULong )
    FT_Get_Next_Char( FT_Face    face,
                      FT_ULong   char_code,
                      FT_UInt   *agindex );
  
  
    /*************************************************************************
     *
     * @function:
     *   FT_Face_Properties
     *
     * @description:
     *   Set or override certain (library or module-wide) properties on a
     *   face-by-face basis.  Useful for finer-grained control and avoiding
     *   locks on shared structures (threads can modify their own faces as
     *   they see fit).
     *
     *   Contrary to @FT_Property_Set, this function uses @FT_Parameter so
     *   that you can pass multiple properties to the target face in one call.
     *   Note that only a subset of the available properties can be
     *   controlled.
     *
     *   * @FT_PARAM_TAG_STEM_DARKENING (stem darkening, corresponding to the
     *     property `no-stem-darkening' provided by the `autofit', `cff',
     *     `type1', and `t1cid' modules; see @no-stem-darkening).
     *
     *   * @FT_PARAM_TAG_LCD_FILTER_WEIGHTS (LCD filter weights, corresponding
     *     to function @FT_Library_SetLcdFilterWeights).
     *
     *   * @FT_PARAM_TAG_RANDOM_SEED (seed value for the CFF, Type~1, and CID
     *     `random' operator, corresponding to the `random-seed' property
     *     provided by the `cff', `type1', and `t1cid' modules; see
     *     @random-seed).
     *
     *   Pass NULL as `data' in @FT_Parameter for a given tag to reset the
     *   option and use the library or module default again.
     *
     * @input:
     *   face ::
     *     A handle to the source face object.
     *
     *   num_properties ::
     *     The number of properties that follow.
     *
     *   properties ::
     *     A handle to an @FT_Parameter array with `num_properties' elements.
     *
     * @return:
     *   FreeType error code.  0~means success.
     *
     * @note:
     *   Here an example that sets three properties.  You must define
     *   FT_CONFIG_OPTION_SUBPIXEL_RENDERING to make the LCD filter examples
     *   work.
     *
     *   {
     *     FT_Parameter         property1;
     *     FT_Bool              darken_stems = 1;
     *
     *     FT_Parameter         property2;
     *     FT_LcdFiveTapFilter  custom_weight =
     *                            { 0x11, 0x44, 0x56, 0x44, 0x11 };
     *
     *     FT_Parameter         property3;
     *     FT_Int32             random_seed = 314159265;
     *
     *     FT_Parameter         properties[3] = { property1,
     *                                            property2,
     *                                            property3 };
     *
     *
     *     property1.tag  = FT_PARAM_TAG_STEM_DARKENING;
     *     property1.data = &darken_stems;
     *
     *     property2.tag  = FT_PARAM_TAG_LCD_FILTER_WEIGHTS;
     *     property2.data = custom_weight;
     *
     *     property3.tag  = FT_PARAM_TAG_RANDOM_SEED;
     *     property3.data = &random_seed;
     *
     *     FT_Face_Properties( face, 3, properties );
     *   }
     *
     *   The next example resets a single property to its default value.
     *
     *   {
     *     FT_Parameter  property;
     *
     *
     *     property.tag  = FT_PARAM_TAG_LCD_FILTER_WEIGHTS;
     *     property.data = NULL;
     *
     *     FT_Face_Properties( face, 1, &property );
     *   }
     *
     * @since:
     *   2.8
     *
     */
    FT_EXPORT( FT_Error )
    FT_Face_Properties( FT_Face        face,
                        FT_UInt        num_properties,
                        FT_Parameter*  properties );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Get_Name_Index                                                  */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Return the glyph index of a given glyph name.                      */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face       :: A handle to the source face object.                  */
    /*                                                                       */
    /*    glyph_name :: The glyph name.                                      */
    /*                                                                       */
    /* <Return>                                                              */
    /*    The glyph index.  0~means `undefined character code'.              */
    /*                                                                       */
    FT_EXPORT( FT_UInt )
    FT_Get_Name_Index( FT_Face     face,
                       FT_String*  glyph_name );
  
  
    /*************************************************************************
     *
     * @macro:
     *   FT_SUBGLYPH_FLAG_XXX
     *
     * @description:
     *   A list of constants describing subglyphs.  Please refer to the
     *   `glyf' table description in the OpenType specification for the
     *   meaning of the various flags (which get synthesized for
     *   non-OpenType subglyphs).
     *
     * @values:
     *   FT_SUBGLYPH_FLAG_ARGS_ARE_WORDS ::
     *   FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES ::
     *   FT_SUBGLYPH_FLAG_ROUND_XY_TO_GRID ::
     *   FT_SUBGLYPH_FLAG_SCALE ::
     *   FT_SUBGLYPH_FLAG_XY_SCALE ::
     *   FT_SUBGLYPH_FLAG_2X2 ::
     *   FT_SUBGLYPH_FLAG_USE_MY_METRICS ::
     *
     */
  #define FT_SUBGLYPH_FLAG_ARGS_ARE_WORDS          1
  #define FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES      2
  #define FT_SUBGLYPH_FLAG_ROUND_XY_TO_GRID        4
  #define FT_SUBGLYPH_FLAG_SCALE                   8
  #define FT_SUBGLYPH_FLAG_XY_SCALE             0x40
  #define FT_SUBGLYPH_FLAG_2X2                  0x80
  #define FT_SUBGLYPH_FLAG_USE_MY_METRICS      0x200
  
  
    /*************************************************************************
     *
     * @func:
     *   FT_Get_SubGlyph_Info
     *
     * @description:
     *   Retrieve a description of a given subglyph.  Only use it if
     *   `glyph->format' is @FT_GLYPH_FORMAT_COMPOSITE; an error is
     *   returned otherwise.
     *
     * @input:
     *   glyph ::
     *     The source glyph slot.
     *
     *   sub_index ::
     *     The index of the subglyph.  Must be less than
     *     `glyph->num_subglyphs'.
     *
     * @output:
     *   p_index ::
     *     The glyph index of the subglyph.
     *
     *   p_flags ::
     *     The subglyph flags, see @FT_SUBGLYPH_FLAG_XXX.
     *
     *   p_arg1 ::
     *     The subglyph's first argument (if any).
     *
     *   p_arg2 ::
     *     The subglyph's second argument (if any).
     *
     *   p_transform ::
     *     The subglyph transformation (if any).
     *
     * @return:
     *   FreeType error code.  0~means success.
     *
     * @note:
     *   The values of `*p_arg1', `*p_arg2', and `*p_transform' must be
     *   interpreted depending on the flags returned in `*p_flags'.  See the
     *   OpenType specification for details.
     *
     */
    FT_EXPORT( FT_Error )
    FT_Get_SubGlyph_Info( FT_GlyphSlot  glyph,
                          FT_UInt       sub_index,
                          FT_Int       *p_index,
                          FT_UInt      *p_flags,
                          FT_Int       *p_arg1,
                          FT_Int       *p_arg2,
                          FT_Matrix    *p_transform );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Enum>                                                                */
    /*    FT_FSTYPE_XXX                                                      */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A list of bit flags used in the `fsType' field of the OS/2 table   */
    /*    in a TrueType or OpenType font and the `FSType' entry in a         */
    /*    PostScript font.  These bit flags are returned by                  */
    /*    @FT_Get_FSType_Flags; they inform client applications of embedding */
    /*    and subsetting restrictions associated with a font.                */
    /*                                                                       */
    /*    See                                                                */
    /*    https://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/FontPolicies.pdf */
    /*    for more details.                                                  */
    /*                                                                       */
    /* <Values>                                                              */
    /*    FT_FSTYPE_INSTALLABLE_EMBEDDING ::                                 */
    /*      Fonts with no fsType bit set may be embedded and permanently     */
    /*      installed on the remote system by an application.                */
    /*                                                                       */
    /*    FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING ::                          */
    /*      Fonts that have only this bit set must not be modified, embedded */
    /*      or exchanged in any manner without first obtaining permission of */
    /*      the font software copyright owner.                               */
    /*                                                                       */
    /*    FT_FSTYPE_PREVIEW_AND_PRINT_EMBEDDING ::                           */
    /*      The font may be embedded and temporarily loaded on the remote    */
    /*      system.  Documents containing Preview & Print fonts must be      */
    /*      opened `read-only'; no edits can be applied to the document.     */
    /*                                                                       */
    /*    FT_FSTYPE_EDITABLE_EMBEDDING ::                                    */
    /*      The font may be embedded but must only be installed temporarily  */
    /*      on other systems.  In contrast to Preview & Print fonts,         */
    /*      documents containing editable fonts may be opened for reading,   */
    /*      editing is permitted, and changes may be saved.                  */
    /*                                                                       */
    /*    FT_FSTYPE_NO_SUBSETTING ::                                         */
    /*      The font may not be subsetted prior to embedding.                */
    /*                                                                       */
    /*    FT_FSTYPE_BITMAP_EMBEDDING_ONLY ::                                 */
    /*      Only bitmaps contained in the font may be embedded; no outline   */
    /*      data may be embedded.  If there are no bitmaps available in the  */
    /*      font, then the font is unembeddable.                             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The flags are ORed together, thus more than a single value can be  */
    /*    returned.                                                          */
    /*                                                                       */
    /*    While the `fsType' flags can indicate that a font may be embedded, */
    /*    a license with the font vendor may be separately required to use   */
    /*    the font in this way.                                              */
    /*                                                                       */
  #define FT_FSTYPE_INSTALLABLE_EMBEDDING         0x0000
  #define FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING  0x0002
  #define FT_FSTYPE_PREVIEW_AND_PRINT_EMBEDDING   0x0004
  #define FT_FSTYPE_EDITABLE_EMBEDDING            0x0008
  #define FT_FSTYPE_NO_SUBSETTING                 0x0100
  #define FT_FSTYPE_BITMAP_EMBEDDING_ONLY         0x0200
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Get_FSType_Flags                                                */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Return the `fsType' flags for a font.                              */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face :: A handle to the source face object.                        */
    /*                                                                       */
    /* <Return>                                                              */
    /*    The `fsType' flags, see @FT_FSTYPE_XXX.                            */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Use this function rather than directly reading the `fs_type' field */
    /*    in the @PS_FontInfoRec structure, which is only guaranteed to      */
    /*    return the correct results for Type~1 fonts.                       */
    /*                                                                       */
    /* <Since>                                                               */
    /*    2.3.8                                                              */
    /*                                                                       */
    FT_EXPORT( FT_UShort )
    FT_Get_FSType_Flags( FT_Face  face );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Section>                                                             */
    /*    glyph_variants                                                     */
    /*                                                                       */
    /* <Title>                                                               */
    /*    Unicode Variation Sequences                                        */
    /*                                                                       */
    /* <Abstract>                                                            */
    /*    The FreeType~2 interface to Unicode Variation Sequences (UVS),     */
    /*    using the SFNT cmap format~14.                                     */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Many characters, especially for CJK scripts, have variant forms.   */
    /*    They are a sort of grey area somewhere between being totally       */
    /*    irrelevant and semantically distinct; for this reason, the Unicode */
    /*    consortium decided to introduce Variation Sequences (VS),          */
    /*    consisting of a Unicode base character and a variation selector    */
    /*    instead of further extending the already huge number of            */
    /*    characters.                                                        */
    /*                                                                       */
    /*    Unicode maintains two different sets, namely `Standardized         */
    /*    Variation Sequences' and registered `Ideographic Variation         */
    /*    Sequences' (IVS), collected in the `Ideographic Variation          */
    /*    Database' (IVD).                                                   */
    /*                                                                       */
    /*      https://unicode.org/Public/UCD/latest/ucd/StandardizedVariants.txt */
    /*      https://unicode.org/reports/tr37/                                */
    /*      https://unicode.org/ivd/                                         */
    /*                                                                       */
    /*    To date (January 2017), the character with the most ideographic    */
    /*    variations is U+9089, having 32 such IVS.                          */
    /*                                                                       */
    /*    Three Mongolian Variation Selectors have the values U+180B-U+180D; */
    /*    256 generic Variation Selectors are encoded in the ranges          */
    /*    U+FE00-U+FE0F and U+E0100-U+E01EF.  IVS currently use Variation    */
    /*    Selectors from the range U+E0100-U+E01EF only.                     */
    /*                                                                       */
    /*    A VS consists of the base character value followed by a single     */
    /*    Variation Selector.  For example, to get the first variation of    */
    /*    U+9089, you have to write the character sequence `U+9089 U+E0100'. */
    /*                                                                       */
    /*    Adobe and MS decided to support both standardized and ideographic  */
    /*    VS with a new cmap subtable (format~14).  It is an odd subtable    */
    /*    because it is not a mapping of input code points to glyphs, but    */
    /*    contains lists of all variations supported by the font.            */
    /*                                                                       */
    /*    A variation may be either `default' or `non-default' for a given   */
    /*    font.  A default variation is the one you will get for that code   */
    /*    point if you look it up in the standard Unicode cmap.  A           */
    /*    non-default variation is a different glyph.                        */
    /*                                                                       */
    /*************************************************************************/
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Face_GetCharVariantIndex                                        */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Return the glyph index of a given character code as modified by    */
    /*    the variation selector.                                            */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face ::                                                            */
    /*      A handle to the source face object.                              */
    /*                                                                       */
    /*    charcode ::                                                        */
    /*      The character code point in Unicode.                             */
    /*                                                                       */
    /*    variantSelector ::                                                 */
    /*      The Unicode code point of the variation selector.                */
    /*                                                                       */
    /* <Return>                                                              */
    /*    The glyph index.  0~means either `undefined character code', or    */
    /*    `undefined selector code', or `no variation selector cmap          */
    /*    subtable', or `current CharMap is not Unicode'.                    */
    /*                                                                       */
    /* <Note>                                                                */
    /*    If you use FreeType to manipulate the contents of font files       */
    /*    directly, be aware that the glyph index returned by this function  */
    /*    doesn't always correspond to the internal indices used within      */
    /*    the file.  This is done to ensure that value~0 always corresponds  */
    /*    to the `missing glyph'.                                            */
    /*                                                                       */
    /*    This function is only meaningful if                                */
    /*      a) the font has a variation selector cmap sub table,             */
    /*    and                                                                */
    /*      b) the current charmap has a Unicode encoding.                   */
    /*                                                                       */
    /* <Since>                                                               */
    /*    2.3.6                                                              */
    /*                                                                       */
    FT_EXPORT( FT_UInt )
    FT_Face_GetCharVariantIndex( FT_Face   face,
                                 FT_ULong  charcode,
                                 FT_ULong  variantSelector );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Face_GetCharVariantIsDefault                                    */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Check whether this variation of this Unicode character is the one  */
    /*    to be found in the `cmap'.                                         */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face ::                                                            */
    /*      A handle to the source face object.                              */
    /*                                                                       */
    /*    charcode ::                                                        */
    /*      The character codepoint in Unicode.                              */
    /*                                                                       */
    /*    variantSelector ::                                                 */
    /*      The Unicode codepoint of the variation selector.                 */
    /*                                                                       */
    /* <Return>                                                              */
    /*    1~if found in the standard (Unicode) cmap, 0~if found in the       */
    /*    variation selector cmap, or -1 if it is not a variation.           */
    /*                                                                       */
    /* <Note>                                                                */
    /*    This function is only meaningful if the font has a variation       */
    /*    selector cmap subtable.                                            */
    /*                                                                       */
    /* <Since>                                                               */
    /*    2.3.6                                                              */
    /*                                                                       */
    FT_EXPORT( FT_Int )
    FT_Face_GetCharVariantIsDefault( FT_Face   face,
                                     FT_ULong  charcode,
                                     FT_ULong  variantSelector );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Face_GetVariantSelectors                                        */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Return a zero-terminated list of Unicode variation selectors found */
    /*    in the font.                                                       */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face ::                                                            */
    /*      A handle to the source face object.                              */
    /*                                                                       */
    /* <Return>                                                              */
    /*    A pointer to an array of selector code points, or NULL if there is */
    /*    no valid variation selector cmap subtable.                         */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The last item in the array is~0; the array is owned by the         */
    /*    @FT_Face object but can be overwritten or released on the next     */
    /*    call to a FreeType function.                                       */
    /*                                                                       */
    /* <Since>                                                               */
    /*    2.3.6                                                              */
    /*                                                                       */
    FT_EXPORT( FT_UInt32* )
    FT_Face_GetVariantSelectors( FT_Face  face );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Face_GetVariantsOfChar                                          */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Return a zero-terminated list of Unicode variation selectors found */
    /*    for the specified character code.                                  */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face ::                                                            */
    /*      A handle to the source face object.                              */
    /*                                                                       */
    /*    charcode ::                                                        */
    /*      The character codepoint in Unicode.                              */
    /*                                                                       */
    /* <Return>                                                              */
    /*    A pointer to an array of variation selector code points that are   */
    /*    active for the given character, or NULL if the corresponding list  */
    /*    is empty.                                                          */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The last item in the array is~0; the array is owned by the         */
    /*    @FT_Face object but can be overwritten or released on the next     */
    /*    call to a FreeType function.                                       */
    /*                                                                       */
    /* <Since>                                                               */
    /*    2.3.6                                                              */
    /*                                                                       */
    FT_EXPORT( FT_UInt32* )
    FT_Face_GetVariantsOfChar( FT_Face   face,
                               FT_ULong  charcode );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Face_GetCharsOfVariant                                          */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Return a zero-terminated list of Unicode character codes found for */
    /*    the specified variation selector.                                  */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face ::                                                            */
    /*      A handle to the source face object.                              */
    /*                                                                       */
    /*    variantSelector ::                                                 */
    /*      The variation selector code point in Unicode.                    */
    /*                                                                       */
    /* <Return>                                                              */
    /*    A list of all the code points that are specified by this selector  */
    /*    (both default and non-default codes are returned) or NULL if there */
    /*    is no valid cmap or the variation selector is invalid.             */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The last item in the array is~0; the array is owned by the         */
    /*    @FT_Face object but can be overwritten or released on the next     */
    /*    call to a FreeType function.                                       */
    /*                                                                       */
    /* <Since>                                                               */
    /*    2.3.6                                                              */
    /*                                                                       */
    FT_EXPORT( FT_UInt32* )
    FT_Face_GetCharsOfVariant( FT_Face   face,
                               FT_ULong  variantSelector );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Section>                                                             */
    /*    computations                                                       */
    /*                                                                       */
    /* <Title>                                                               */
    /*    Computations                                                       */
    /*                                                                       */
    /* <Abstract>                                                            */
    /*    Crunching fixed numbers and vectors.                               */
    /*                                                                       */
    /* <Description>                                                         */
    /*    This section contains various functions used to perform            */
    /*    computations on 16.16 fixed-float numbers or 2d vectors.           */
    /*                                                                       */
    /* <Order>                                                               */
    /*    FT_MulDiv                                                          */
    /*    FT_MulFix                                                          */
    /*    FT_DivFix                                                          */
    /*    FT_RoundFix                                                        */
    /*    FT_CeilFix                                                         */
    /*    FT_FloorFix                                                        */
    /*    FT_Vector_Transform                                                */
    /*    FT_Matrix_Multiply                                                 */
    /*    FT_Matrix_Invert                                                   */
    /*                                                                       */
    /*************************************************************************/
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_MulDiv                                                          */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Compute `(a*b)/c' with maximum accuracy, using a 64-bit            */
    /*    intermediate integer whenever necessary.                           */
    /*                                                                       */
    /*    This function isn't necessarily as fast as some processor specific */
    /*    operations, but is at least completely portable.                   */
    /*                                                                       */
    /* <Input>                                                               */
    /*    a :: The first multiplier.                                         */
    /*                                                                       */
    /*    b :: The second multiplier.                                        */
    /*                                                                       */
    /*    c :: The divisor.                                                  */
    /*                                                                       */
    /* <Return>                                                              */
    /*    The result of `(a*b)/c'.  This function never traps when trying to */
    /*    divide by zero; it simply returns `MaxInt' or `MinInt' depending   */
    /*    on the signs of `a' and `b'.                                       */
    /*                                                                       */
    FT_EXPORT( FT_Long )
    FT_MulDiv( FT_Long  a,
               FT_Long  b,
               FT_Long  c );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_MulFix                                                          */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Compute `(a*b)/0x10000' with maximum accuracy.  Its main use is to */
    /*    multiply a given value by a 16.16 fixed-point factor.              */
    /*                                                                       */
    /* <Input>                                                               */
    /*    a :: The first multiplier.                                         */
    /*                                                                       */
    /*    b :: The second multiplier.  Use a 16.16 factor here whenever      */
    /*         possible (see note below).                                    */
    /*                                                                       */
    /* <Return>                                                              */
    /*    The result of `(a*b)/0x10000'.                                     */
    /*                                                                       */
    /* <Note>                                                                */
    /*    This function has been optimized for the case where the absolute   */
    /*    value of `a' is less than 2048, and `b' is a 16.16 scaling factor. */
    /*    As this happens mainly when scaling from notional units to         */
    /*    fractional pixels in FreeType, it resulted in noticeable speed     */
    /*    improvements between versions 2.x and 1.x.                         */
    /*                                                                       */
    /*    As a conclusion, always try to place a 16.16 factor as the         */
    /*    _second_ argument of this function; this can make a great          */
    /*    difference.                                                        */
    /*                                                                       */
    FT_EXPORT( FT_Long )
    FT_MulFix( FT_Long  a,
               FT_Long  b );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_DivFix                                                          */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Compute `(a*0x10000)/b' with maximum accuracy.  Its main use is to */
    /*    divide a given value by a 16.16 fixed-point factor.                */
    /*                                                                       */
    /* <Input>                                                               */
    /*    a :: The numerator.                                                */
    /*                                                                       */
    /*    b :: The denominator.  Use a 16.16 factor here.                    */
    /*                                                                       */
    /* <Return>                                                              */
    /*    The result of `(a*0x10000)/b'.                                     */
    /*                                                                       */
    FT_EXPORT( FT_Long )
    FT_DivFix( FT_Long  a,
               FT_Long  b );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_RoundFix                                                        */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Round a 16.16 fixed number.                                        */
    /*                                                                       */
    /* <Input>                                                               */
    /*    a :: The number to be rounded.                                     */
    /*                                                                       */
    /* <Return>                                                              */
    /*    `a' rounded to the nearest 16.16 fixed integer, halfway cases away */
    /*    from zero.                                                         */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The function uses wrap-around arithmetic.                          */
    /*                                                                       */
    FT_EXPORT( FT_Fixed )
    FT_RoundFix( FT_Fixed  a );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_CeilFix                                                         */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Compute the smallest following integer of a 16.16 fixed number.    */
    /*                                                                       */
    /* <Input>                                                               */
    /*    a :: The number for which the ceiling function is to be computed.  */
    /*                                                                       */
    /* <Return>                                                              */
    /*    `a' rounded towards plus infinity.                                 */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The function uses wrap-around arithmetic.                          */
    /*                                                                       */
    FT_EXPORT( FT_Fixed )
    FT_CeilFix( FT_Fixed  a );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_FloorFix                                                        */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Compute the largest previous integer of a 16.16 fixed number.      */
    /*                                                                       */
    /* <Input>                                                               */
    /*    a :: The number for which the floor function is to be computed.    */
    /*                                                                       */
    /* <Return>                                                              */
    /*    `a' rounded towards minus infinity.                                */
    /*                                                                       */
    FT_EXPORT( FT_Fixed )
    FT_FloorFix( FT_Fixed  a );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Vector_Transform                                                */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Transform a single vector through a 2x2 matrix.                    */
    /*                                                                       */
    /* <InOut>                                                               */
    /*    vector :: The target vector to transform.                          */
    /*                                                                       */
    /* <Input>                                                               */
    /*    matrix :: A pointer to the source 2x2 matrix.                      */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The result is undefined if either `vector' or `matrix' is invalid. */
    /*                                                                       */
    FT_EXPORT( void )
    FT_Vector_Transform( FT_Vector*        vec,
                         const FT_Matrix*  matrix );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Section>                                                             */
    /*    version                                                            */
    /*                                                                       */
    /* <Title>                                                               */
    /*    FreeType Version                                                   */
    /*                                                                       */
    /* <Abstract>                                                            */
    /*    Functions and macros related to FreeType versions.                 */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Note that those functions and macros are of limited use because    */
    /*    even a new release of FreeType with only documentation changes     */
    /*    increases the version number.                                      */
    /*                                                                       */
    /* <Order>                                                               */
    /*    FT_Library_Version                                                 */
    /*                                                                       */
    /*    FREETYPE_MAJOR                                                     */
    /*    FREETYPE_MINOR                                                     */
    /*    FREETYPE_PATCH                                                     */
    /*                                                                       */
    /*    FT_Face_CheckTrueTypePatents                                       */
    /*    FT_Face_SetUnpatentedHinting                                       */
    /*                                                                       */
    /*    FREETYPE_XXX                                                       */
    /*                                                                       */
    /*************************************************************************/
  
  
    /*************************************************************************
     *
     * @enum:
     *   FREETYPE_XXX
     *
     * @description:
     *   These three macros identify the FreeType source code version.
     *   Use @FT_Library_Version to access them at runtime.
     *
     * @values:
     *   FREETYPE_MAJOR :: The major version number.
     *   FREETYPE_MINOR :: The minor version number.
     *   FREETYPE_PATCH :: The patch level.
     *
     * @note:
     *   The version number of FreeType if built as a dynamic link library
     *   with the `libtool' package is _not_ controlled by these three
     *   macros.
     *
     */
  #define FREETYPE_MAJOR  2
  #define FREETYPE_MINOR  9
  #define FREETYPE_PATCH  1
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Library_Version                                                 */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Return the version of the FreeType library being used.  This is    */
    /*    useful when dynamically linking to the library, since one cannot   */
    /*    use the macros @FREETYPE_MAJOR, @FREETYPE_MINOR, and               */
    /*    @FREETYPE_PATCH.                                                   */
    /*                                                                       */
    /* <Input>                                                               */
    /*    library :: A source library handle.                                */
    /*                                                                       */
    /* <Output>                                                              */
    /*    amajor  :: The major version number.                               */
    /*                                                                       */
    /*    aminor  :: The minor version number.                               */
    /*                                                                       */
    /*    apatch  :: The patch version number.                               */
    /*                                                                       */
    /* <Note>                                                                */
    /*    The reason why this function takes a `library' argument is because */
    /*    certain programs implement library initialization in a custom way  */
    /*    that doesn't use @FT_Init_FreeType.                                */
    /*                                                                       */
    /*    In such cases, the library version might not be available before   */
    /*    the library object has been created.                               */
    /*                                                                       */
    FT_EXPORT( void )
    FT_Library_Version( FT_Library   library,
                        FT_Int      *amajor,
                        FT_Int      *aminor,
                        FT_Int      *apatch );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Face_CheckTrueTypePatents                                       */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Deprecated, does nothing.                                          */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face :: A face handle.                                             */
    /*                                                                       */
    /* <Return>                                                              */
    /*    Always returns false.                                              */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Since May 2010, TrueType hinting is no longer patented.            */
    /*                                                                       */
    /* <Since>                                                               */
    /*    2.3.5                                                              */
    /*                                                                       */
    FT_EXPORT( FT_Bool )
    FT_Face_CheckTrueTypePatents( FT_Face  face );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_Face_SetUnpatentedHinting                                       */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Deprecated, does nothing.                                          */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face  :: A face handle.                                            */
    /*                                                                       */
    /*    value :: New boolean setting.                                      */
    /*                                                                       */
    /* <Return>                                                              */
    /*    Always returns false.                                              */
    /*                                                                       */
    /* <Note>                                                                */
    /*    Since May 2010, TrueType hinting is no longer patented.            */
    /*                                                                       */
    /* <Since>                                                               */
    /*    2.3.5                                                              */
    /*                                                                       */
    FT_EXPORT( FT_Bool )
    FT_Face_SetUnpatentedHinting( FT_Face  face,
                                  FT_Bool  value );
  
    /* */
  
  
  FT_END_HEADER
  
  #endif /* FREETYPE_H_ */
  
  
  /* END */
  