text: /*
   * jmorecfg.h
   *
   * Copyright (C) 1991-1997, Thomas G. Lane.
   * This file is part of the Independent JPEG Group's software.
   * For conditions of distribution and use, see the accompanying README file.
   *
   * This file contains additional configuration options that customize the
   * JPEG software for special applications or support machine-dependent
   * optimizations.  Most users will not need to touch this file.
   */
  
  /*
   * This file has been modified for the Mozilla/Netscape environment.
   * Modifications are distributed under the mozilla.org tri-license and are
   * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
   * Reserved. See http://www.mozilla.org/MPL/
   */
  
  
  /*
   * Define BITS_IN_JSAMPLE as either
   *   8   for 8-bit sample values (the usual setting)
   *   12  for 12-bit sample values
   * Only 8 and 12 are legal data precisions for lossy JPEG according to the
   * JPEG standard, and the IJG code does not support anything else!
   * We do not support run-time selection of data precision, sorry.
   */
  
  #define BITS_IN_JSAMPLE  8	/* use 8 or 12 */
  
  
  /*
   * Maximum number of components (color channels) allowed in JPEG image.
   * To meet the letter of the JPEG spec, set this to 255.  However, darn
   * few applications need more than 4 channels (maybe 5 for CMYK + alpha
   * mask).  We recommend 10 as a reasonable compromise; use 4 if you are
   * really short on memory.  (Each allowed component costs a hundred or so
   * bytes of storage, whether actually used in an image or not.)
   */
  
  #define MAX_COMPONENTS  10	/* maximum number of image components */
  
  
  /*
   * Basic data types.
   * You may need to change these if you have a machine with unusual data
   * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
   * or "long" not 32 bits.  We don't care whether "int" is 16 or 32 bits,
   * but it had better be at least 16.
   */
  
  /* Representation of a single sample (pixel element value).
   * We frequently allocate large arrays of these, so it's important to keep
   * them small.  But if you have memory to burn and access to char or short
   * arrays is very slow on your hardware, you might want to change these.
   */
  
  #if BITS_IN_JSAMPLE == 8
  /* JSAMPLE should be the smallest type that will hold the values 0..255.
   * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
   */
  
  #ifdef HAVE_UNSIGNED_CHAR
  
  typedef unsigned char JSAMPLE;
  #define GETJSAMPLE(value)  ((int) (value))
  
  #else /* not HAVE_UNSIGNED_CHAR */
  
  typedef char JSAMPLE;
  #ifdef CHAR_IS_UNSIGNED
  #define GETJSAMPLE(value)  ((int) (value))
  #else
  #define GETJSAMPLE(value)  ((int) (value) & 0xFF)
  #endif /* CHAR_IS_UNSIGNED */
  
  #endif /* HAVE_UNSIGNED_CHAR */
  
  #define MAXJSAMPLE	255
  #define CENTERJSAMPLE	128
  
  #endif /* BITS_IN_JSAMPLE == 8 */
  
  
  #if BITS_IN_JSAMPLE == 12
  /* JSAMPLE should be the smallest type that will hold the values 0..4095.
   * On nearly all machines "short" will do nicely.
   */
  
  typedef short JSAMPLE;
  #define GETJSAMPLE(value)  ((int) (value))
  
  #define MAXJSAMPLE	4095
  #define CENTERJSAMPLE	2048
  
  #endif /* BITS_IN_JSAMPLE == 12 */
  
  
  /* Representation of a DCT frequency coefficient.
   * This should be a signed value of at least 16 bits; "short" is usually OK.
   * Again, we allocate large arrays of these, but you can change to int
   * if you have memory to burn and "short" is really slow.
   */
  
  typedef short JCOEF;
  
  /* Defines for MMX/SSE2 support. */
  
  #if defined(XP_WIN32) && defined(_M_IX86) && !defined(__GNUC__)
  #define HAVE_MMX_INTEL_MNEMONICS 
  
  /* SSE2 code appears broken for some cpus (bug 247437) */
  #define HAVE_SSE2_INTEL_MNEMONICS
  #define HAVE_SSE2_INTRINSICS
  #endif
  
  #if defined(__GNUC__) && defined(__i386__)
  #if defined(XP_MACOSX)
  #define HAVE_SSE2_INTRINSICS
  #endif /* ! XP_MACOSX */
  #endif /* ! GNUC && i386 */
  
  /* Add support for other platforms here */
  
  
  /* Compressed datastreams are represented as arrays of JOCTET.
   * These must be EXACTLY 8 bits wide, at least once they are written to
   * external storage.  Note that when using the stdio data source/destination
   * managers, this is also the data type passed to fread/fwrite.
   */
  
  #ifdef HAVE_UNSIGNED_CHAR
  
  typedef unsigned char JOCTET;
  #define GETJOCTET(value)  (value)
  
  #else /* not HAVE_UNSIGNED_CHAR */
  
  typedef char JOCTET;
  #ifdef CHAR_IS_UNSIGNED
  #define GETJOCTET(value)  (value)
  #else
  #define GETJOCTET(value)  ((value) & 0xFF)
  #endif /* CHAR_IS_UNSIGNED */
  
  #endif /* HAVE_UNSIGNED_CHAR */
  
  
  /* These typedefs are used for various table entries and so forth.
   * They must be at least as wide as specified; but making them too big
   * won't cost a huge amount of memory, so we don't provide special
   * extraction code like we did for JSAMPLE.  (In other words, these
   * typedefs live at a different point on the speed/space tradeoff curve.)
   */
  
  /* UINT8 must hold at least the values 0..255. */
  
  #ifdef HAVE_UNSIGNED_CHAR
  typedef unsigned char UINT8;
  #else /* not HAVE_UNSIGNED_CHAR */
  #ifdef CHAR_IS_UNSIGNED
  typedef char UINT8;
  #else /* not CHAR_IS_UNSIGNED */
  typedef short UINT8;
  #endif /* CHAR_IS_UNSIGNED */
  #endif /* HAVE_UNSIGNED_CHAR */
  
  /* UINT16 must hold at least the values 0..65535. */
  
  #ifdef HAVE_UNSIGNED_SHORT
  typedef unsigned short UINT16;
  #else /* not HAVE_UNSIGNED_SHORT */
  typedef unsigned int UINT16;
  #endif /* HAVE_UNSIGNED_SHORT */
  
  /* INT16 must hold at least the values -32768..32767. */
  
  #ifndef XMD_H			/* X11/xmd.h correctly defines INT16 */
  typedef short INT16;
  #endif
  
  /* INT32 must hold at least signed 32-bit values. */
  
  #ifndef XMD_H			/* X11/xmd.h correctly defines INT32 */
  #ifndef _BASETSD_H_		/* basetsd.h correctly defines INT32 */
  #ifndef _BASETSD_H
  typedef long INT32;
  #endif
  #endif
  #endif
  
  /* Datatype used for image dimensions.  The JPEG standard only supports
   * images up to 64K*64K due to 16-bit fields in SOF markers.  Therefore
   * "unsigned int" is sufficient on all machines.  However, if you need to
   * handle larger images and you don't mind deviating from the spec, you
   * can change this datatype.
   */
  
  typedef unsigned int JDIMENSION;
  
  #define JPEG_MAX_DIMENSION  65500L  /* a tad under 64K to prevent overflows */
  
  
  /* These macros are used in all function definitions and extern declarations.
   * You could modify them if you need to change function linkage conventions;
   * in particular, you'll need to do that to make the library a Windows DLL.
   * Another application is to make all functions global for use with debuggers
   * or code profilers that require it.
   */
  
  /* Mozilla mod: make external functions be DLL-able via JRI_PUBLIC_API(),
   * and supply extern "C" for C++ users of the C-compiled IJG library.
   * (Well, not anymore, but there's still a modification here.)
   */
  #include "prtypes.h"
  
  /* a function called through method pointers: */
  #define METHODDEF(type)		static type
  /* a function used only in its module: */
  #define LOCAL(type)		static type
  
  PR_BEGIN_EXTERN_C
  #define GLOBAL(type) type
  #define EXTERN(type) extern type
  PR_END_EXTERN_C
  
  
  /* This macro is used to declare a "method", that is, a function pointer.
   * We want to supply prototype parameters if the compiler can cope.
   * Note that the arglist parameter must be parenthesized!
   * Again, you can customize this if you need special linkage keywords.
   */
  
  #ifdef HAVE_PROTOTYPES
  #define JMETHOD(type,methodname,arglist)  type (*methodname) arglist
  #else
  #define JMETHOD(type,methodname,arglist)  type (*methodname) ()
  #endif
  
  
  /* Here is the pseudo-keyword for declaring pointers that must be "far"
   * on 80x86 machines.  Most of the specialized coding for 80x86 is handled
   * by just saying "FAR *" where such a pointer is needed.  In a few places
   * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
   */
  
  #ifndef FAR
  #ifdef NEED_FAR_POINTERS
  #define FAR  far
  #else
  #define FAR
  #endif
  #endif
  
  
  /*
   * On a few systems, type boolean and/or its values FALSE, TRUE may appear
   * in standard header files.  Or you may have conflicts with application-
   * specific header files that you want to include together with these files.
   * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
   */
  
  /* Mozilla mod: IJG distribution makes boolean = int, but on Windows
   * it's far safer to define boolean = unsigned char.  Easier to switch
   * than fight.
   */
  
  /* For some reason, on SunOS 5.3 HAVE_BOOLEAN gets defined when using
   * gcc, but boolean doesn't.  Even if you use -UHAVE_BOOLEAN, it still
   * gets reset somewhere.
   */
  #if defined(MUST_UNDEF_HAVE_BOOLEAN_AFTER_INCLUDES) && defined(HAVE_BOOLEAN)
  #undef HAVE_BOOLEAN
  #endif
  #ifndef HAVE_BOOLEAN
  typedef unsigned char boolean;
  #endif
  #ifndef FALSE			/* in case these macros already exist */
  #define FALSE	0		/* values of boolean */
  #endif
  #ifndef TRUE
  #define TRUE	1
  #endif
  
  
  /*
   * The remaining options affect code selection within the JPEG library,
   * but they don't need to be visible to most applications using the library.
   * To minimize application namespace pollution, the symbols won't be
   * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
   */
  
  #ifdef JPEG_INTERNALS
  #define JPEG_INTERNAL_OPTIONS
  #endif
  
  #ifdef JPEG_INTERNAL_OPTIONS
  
  
  /*
   * These defines indicate whether to include various optional functions.
   * Undefining some of these symbols will produce a smaller but less capable
   * library.  Note that you can leave certain source files out of the
   * compilation/linking process if you've #undef'd the corresponding symbols.
   * (You may HAVE to do that if your compiler doesn't like null source files.)
   */
  
  /*
   * Mozilla mods here: undef some features not actually used by the browser.
   * This reduces object code size and more importantly allows us to compile
   * even with broken compilers that crash when fed certain modules of the
   * IJG sources.  Currently we undef:
   * DCT_FLOAT_SUPPORTED INPUT_SMOOTHING_SUPPORTED IDCT_SCALING_SUPPORTED
   * QUANT_1PASS_SUPPORTED QUANT_2PASS_SUPPORTED
   */
  
  /* Arithmetic coding is unsupported for legal reasons.  Complaints to IBM. */
  
  /* Capability options common to encoder and decoder: */
  
  #define DCT_ISLOW_SUPPORTED	/* slow but accurate integer algorithm */
  #undef  DCT_IFAST_SUPPORTED	/* faster, less accurate integer method */
  #undef  DCT_FLOAT_SUPPORTED	/* floating-point: accurate, fast on fast HW */
  
  /* Encoder capability options: */
  
  #undef  C_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
  #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
  #define C_PROGRESSIVE_SUPPORTED	    /* Progressive JPEG? (Requires MULTISCAN)*/
  #define ENTROPY_OPT_SUPPORTED	    /* Optimization of entropy coding parms? */
  /* Note: if you selected 12-bit data precision, it is dangerous to turn off
   * ENTROPY_OPT_SUPPORTED.  The standard Huffman tables are only good for 8-bit
   * precision, so jchuff.c normally uses entropy optimization to compute
   * usable tables for higher precision.  If you don't want to do optimization,
   * you'll have to supply different default Huffman tables.
   * The exact same statements apply for progressive JPEG: the default tables
   * don't work for progressive mode.  (This may get fixed, however.)
   */
  #undef  INPUT_SMOOTHING_SUPPORTED   /* Input image smoothing option? */
  
  /* Decoder capability options: */
  
  #undef  D_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
  #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
  #define D_PROGRESSIVE_SUPPORTED	    /* Progressive JPEG? (Requires MULTISCAN)*/
  #define SAVE_MARKERS_SUPPORTED	    /* jpeg_save_markers() needed? */
  #define BLOCK_SMOOTHING_SUPPORTED   /* Block smoothing? (Progressive only) */
  #undef  IDCT_SCALING_SUPPORTED	    /* Output rescaling via IDCT? */
  #undef  UPSAMPLE_SCALING_SUPPORTED  /* Output rescaling at upsample stage? */
  #define UPSAMPLE_MERGING_SUPPORTED  /* Fast path for sloppy upsampling? */
  #undef  QUANT_1PASS_SUPPORTED	    /* 1-pass color quantization? */
  #undef  QUANT_2PASS_SUPPORTED	    /* 2-pass color quantization? */
  
  /* more capability options later, no doubt */
  
  
  /*
   * Ordering of RGB data in scanlines passed to or from the application.
   * If your application wants to deal with data in the order B,G,R, just
   * change these macros.  You can also deal with formats such as R,G,B,X
   * (one extra byte per pixel) by changing RGB_PIXELSIZE.  Note that changing
   * the offsets will also change the order in which colormap data is organized.
   * RESTRICTIONS:
   * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
   * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
   *    useful if you are using JPEG color spaces other than YCbCr or grayscale.
   * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
   *    is not 3 (they don't understand about dummy color components!).  So you
   *    can't use color quantization if you change that value.
   */
  
  #define RGB_RED		0	/* Offset of Red in an RGB scanline element */
  #define RGB_GREEN	1	/* Offset of Green */
  #define RGB_BLUE	2	/* Offset of Blue */
  #define RGB_PIXELSIZE	3	/* JSAMPLEs per RGB scanline element */
  
  
  /* Definitions for speed-related optimizations. */
  
  
  /* If your compiler supports inline functions, define INLINE
   * as the inline keyword; otherwise define it as empty.
   */
  
  /* Mozilla mods here: add more ways of defining INLINE */
  
  #ifndef INLINE
  #ifdef __GNUC__			/* for instance, GNU C knows about inline */
  #define INLINE __inline__
  #endif
  #if defined( __IBMC__ ) || defined (__IBMCPP__)
  #define INLINE _Inline
  #endif
  #ifndef INLINE
  #ifdef __cplusplus
  #define INLINE inline		/* a C++ compiler should have it too */
  #else
  #define INLINE			/* default is to define it as empty */
  #endif
  #endif
  #endif
  
  
  /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
   * two 16-bit shorts is faster than multiplying two ints.  Define MULTIPLIER
   * as short on such a machine.  MULTIPLIER must be at least 16 bits wide.
   */
  
  #ifndef MULTIPLIER
  #define MULTIPLIER  int16		/* type for fastest integer multiply */
  #endif
  
  
  /* FAST_FLOAT should be either float or double, whichever is done faster
   * by your compiler.  (Note that this type is only used in the floating point
   * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
   * Typically, float is faster in ANSI C compilers, while double is faster in
   * pre-ANSI compilers (because they insist on converting to double anyway).
   * The code below therefore chooses float if we have ANSI-style prototypes.
   */
  
  #ifndef FAST_FLOAT
  #ifdef HAVE_PROTOTYPES
  #define FAST_FLOAT  float
  #else
  #define FAST_FLOAT  double
  #endif
  #endif
  
  #endif /* JPEG_INTERNAL_OPTIONS */
  