text: /***************************************************************************/
  /*                                                                         */
  /*  ftrend1.c                                                              */
  /*                                                                         */
  /*    The FreeType glyph rasterizer interface (body).                      */
  /*                                                                         */
  /*  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.                                        */
  /*                                                                         */
  /***************************************************************************/
  
  
  #include "ft2build.h"
  #include FT_INTERNAL_DEBUG_H
  #include FT_INTERNAL_OBJECTS_H
  #include FT_OUTLINE_H
  #include "ftrend1.h"
  #include "ftraster.h"
  
  #include "rasterrs.h"
  
  
    /* initialize renderer -- init its raster */
    static FT_Error
    ft_raster1_init( FT_Renderer  render )
    {
      render->clazz->raster_class->raster_reset( render->raster, NULL, 0 );
  
      return FT_Err_Ok;
    }
  
  
    /* set render-specific mode */
    static FT_Error
    ft_raster1_set_mode( FT_Renderer  render,
                         FT_ULong     mode_tag,
                         FT_Pointer   data )
    {
      /* we simply pass it to the raster */
      return render->clazz->raster_class->raster_set_mode( render->raster,
                                                           mode_tag,
                                                           data );
    }
  
  
    /* transform a given glyph image */
    static FT_Error
    ft_raster1_transform( FT_Renderer       render,
                          FT_GlyphSlot      slot,
                          const FT_Matrix*  matrix,
                          const FT_Vector*  delta )
    {
      FT_Error error = FT_Err_Ok;
  
  
      if ( slot->format != render->glyph_format )
      {
        error = FT_THROW( Invalid_Argument );
        goto Exit;
      }
  
      if ( matrix )
        FT_Outline_Transform( &slot->outline, matrix );
  
      if ( delta )
        FT_Outline_Translate( &slot->outline, delta->x, delta->y );
  
    Exit:
      return error;
    }
  
  
    /* return the glyph's control box */
    static void
    ft_raster1_get_cbox( FT_Renderer   render,
                         FT_GlyphSlot  slot,
                         FT_BBox*      cbox )
    {
      FT_ZERO( cbox );
  
      if ( slot->format == render->glyph_format )
        FT_Outline_Get_CBox( &slot->outline, cbox );
    }
  
  
    /* convert a slot's glyph image into a bitmap */
    static FT_Error
    ft_raster1_render( FT_Renderer       render,
                       FT_GlyphSlot      slot,
                       FT_Render_Mode    mode,
                       const FT_Vector*  origin )
    {
      FT_Error     error   = FT_Err_Ok;
      FT_Outline*  outline = &slot->outline;
      FT_Bitmap*   bitmap  = &slot->bitmap;
      FT_Memory    memory  = render->root.memory;
      FT_Pos       x_shift = 0;
      FT_Pos       y_shift = 0;
  
      FT_Raster_Params  params;
  
  
      /* check glyph image format */
      if ( slot->format != render->glyph_format )
      {
        error = FT_THROW( Invalid_Argument );
        goto Exit;
      }
  
      /* check rendering mode */
      if ( mode != FT_RENDER_MODE_MONO )
      {
        /* raster1 is only capable of producing monochrome bitmaps */
        return FT_THROW( Cannot_Render_Glyph );
      }
  
      /* release old bitmap buffer */
      if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
      {
        FT_FREE( bitmap->buffer );
        slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
      }
  
      ft_glyphslot_preset_bitmap( slot, mode, origin );
  
      /* allocate new one */
      if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) )
        goto Exit;
  
      slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
  
      x_shift = -slot->bitmap_left * 64;
      y_shift = ( (FT_Int)bitmap->rows - slot->bitmap_top ) * 64;
  
      if ( origin )
      {
        x_shift += origin->x;
        y_shift += origin->y;
      }
  
      /* translate outline to render it into the bitmap */
      if ( x_shift || y_shift )
        FT_Outline_Translate( outline, x_shift, y_shift );
  
      /* set up parameters */
      params.target = bitmap;
      params.source = outline;
      params.flags  = FT_RASTER_FLAG_DEFAULT;
  
      /* render outline into the bitmap */
      error = render->raster_render( render->raster, &params );
  
    Exit:
      if ( !error )
        /* everything is fine; the glyph is now officially a bitmap */
        slot->format = FT_GLYPH_FORMAT_BITMAP;
      else if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
      {
        FT_FREE( bitmap->buffer );
        slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
      }
  
      if ( x_shift || y_shift )
        FT_Outline_Translate( outline, -x_shift, -y_shift );
  
      return error;
    }
  
  
    FT_DEFINE_RENDERER(
      ft_raster1_renderer_class,
  
        FT_MODULE_RENDERER,
        sizeof ( FT_RendererRec ),
  
        "raster1",
        0x10000L,
        0x20000L,
  
        NULL,    /* module specific interface */
  
        (FT_Module_Constructor)ft_raster1_init,  /* module_init   */
        (FT_Module_Destructor) NULL,             /* module_done   */
        (FT_Module_Requester)  NULL,             /* get_interface */
  
      FT_GLYPH_FORMAT_OUTLINE,
  
      (FT_Renderer_RenderFunc)   ft_raster1_render,     /* render_glyph    */
      (FT_Renderer_TransformFunc)ft_raster1_transform,  /* transform_glyph */
      (FT_Renderer_GetCBoxFunc)  ft_raster1_get_cbox,   /* get_glyph_cbox  */
      (FT_Renderer_SetModeFunc)  ft_raster1_set_mode,   /* set_mode        */
  
      (FT_Raster_Funcs*)&ft_standard_raster         /* raster_class    */
    )
  
  
  /* END */
  