thirdparty/freetype-2.3.12/src/raster/ftrend1.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ftrend1.c                                                              */
   4 /*                                                                         */
   5 /*    The FreeType glyph rasterizer interface (body).                      */
   6 /*                                                                         */
   7 /*  Copyright 1996-2001, 2002, 2003, 2005, 2006 by                         */
   8 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
   9 /*                                                                         */
  10 /*  This file is part of the FreeType project, and may only be used,       */
  11 /*  modified, and distributed under the terms of the FreeType project      */
  12 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  13 /*  this file you indicate that you have read the license and              */
  14 /*  understand and accept it fully.                                        */
  15 /*                                                                         */
  16 /***************************************************************************/
  17
  18
  19 #include <ft2build.h>
  20 #include FT_INTERNAL_OBJECTS_H
  21 #include FT_OUTLINE_H
  22 #include "ftrend1.h"
  23 #include "ftraster.h"
  24 #include "rastpic.h"
  25
  26 #include "rasterrs.h"
  27
  28
  29   /* initialize renderer -- init its raster */
  30   static FT_Error
  31   ft_raster1_init( FT_Renderer  render )
  32   {
  33     FT_Library  library = FT_MODULE_LIBRARY( render );
  34
  35
  36     render->clazz->raster_class->raster_reset( render->raster,
  37                                                library->raster_pool,
  38                                                library->raster_pool_size );
  39
  40     return Raster_Err_Ok;
  41   }
  42
  43
  44   /* set render-specific mode */
  45   static FT_Error
  46   ft_raster1_set_mode( FT_Renderer  render,
  47                        FT_ULong     mode_tag,
  48                        FT_Pointer   data )
  49   {
  50     /* we simply pass it to the raster */
  51     return render->clazz->raster_class->raster_set_mode( render->raster,
  52                                                          mode_tag,
  53                                                          data );
  54   }
  55
  56
  57   /* transform a given glyph image */
  58   static FT_Error
  59   ft_raster1_transform( FT_Renderer       render,
  60                         FT_GlyphSlot      slot,
  61                         const FT_Matrix*  matrix,
  62                         const FT_Vector*  delta )
  63   {
  64     FT_Error error = Raster_Err_Ok;
  65
  66
  67     if ( slot->format != render->glyph_format )
  68     {
  69       error = Raster_Err_Invalid_Argument;
  70       goto Exit;
  71     }
  72
  73     if ( matrix )
  74       FT_Outline_Transform( &slot->outline, matrix );
  75
  76     if ( delta )
  77       FT_Outline_Translate( &slot->outline, delta->x, delta->y );
  78
  79   Exit:
  80     return error;
  81   }
  82
  83
  84   /* return the glyph's control box */
  85   static void
  86   ft_raster1_get_cbox( FT_Renderer   render,
  87                        FT_GlyphSlot  slot,
  88                        FT_BBox*      cbox )
  89   {
  90     FT_MEM_ZERO( cbox, sizeof ( *cbox ) );
  91
  92     if ( slot->format == render->glyph_format )
  93       FT_Outline_Get_CBox( &slot->outline, cbox );
  94   }
  95
  96
  97   /* convert a slot's glyph image into a bitmap */
  98   static FT_Error
  99   ft_raster1_render( FT_Renderer       render,
 100                      FT_GlyphSlot      slot,
 101                      FT_Render_Mode    mode,
 102                      const FT_Vector*  origin )
 103   {
 104     FT_Error     error;
 105     FT_Outline*  outline;
 106     FT_BBox      cbox;
 107     FT_UInt      width, height, pitch;
 108     FT_Bitmap*   bitmap;
 109     FT_Memory    memory;
 110
 111     FT_Raster_Params  params;
 112
 113
 114     /* check glyph image format */
 115     if ( slot->format != render->glyph_format )
 116     {
 117       error = Raster_Err_Invalid_Argument;
 118       goto Exit;
 119     }
 120
 121     /* check rendering mode */
 122 #ifndef FT_CONFIG_OPTION_PIC
 123     if ( mode != FT_RENDER_MODE_MONO )
 124     {
 125       /* raster1 is only capable of producing monochrome bitmaps */
 126       if ( render->clazz == &ft_raster1_renderer_class )
 127         return Raster_Err_Cannot_Render_Glyph;
 128     }
 129     else
 130     {
 131       /* raster5 is only capable of producing 5-gray-levels bitmaps */
 132       if ( render->clazz == &ft_raster5_renderer_class )
 133         return Raster_Err_Cannot_Render_Glyph;
 134     }
 135 #else /* FT_CONFIG_OPTION_PIC */
 136     /* When PIC is enabled, we cannot get to the class object      */
 137     /* so instead we check the final character in the class name   */
 138     /* ("raster5" or "raster1"). Yes this is a hack.               */
 139     /* The "correct" thing to do is have different render function */
 140     /* for each of the classes.                                    */
 141     if ( mode != FT_RENDER_MODE_MONO )
 142     {
 143       /* raster1 is only capable of producing monochrome bitmaps */
 144       if ( render->clazz->root.module_name[6] == '1' )
 145         return Raster_Err_Cannot_Render_Glyph;
 146     }
 147     else
 148     {
 149       /* raster5 is only capable of producing 5-gray-levels bitmaps */
 150       if ( render->clazz->root.module_name[6] == '5' )
 151         return Raster_Err_Cannot_Render_Glyph;
 152     }
 153 #endif /* FT_CONFIG_OPTION_PIC */
 154
 155     outline = &slot->outline;
 156
 157     /* translate the outline to the new origin if needed */
 158     if ( origin )
 159       FT_Outline_Translate( outline, origin->x, origin->y );
 160
 161     /* compute the control box, and grid fit it */
 162     FT_Outline_Get_CBox( outline, &cbox );
 163
 164     cbox.xMin = FT_PIX_FLOOR( cbox.xMin );
 165     cbox.yMin = FT_PIX_FLOOR( cbox.yMin );
 166     cbox.xMax = FT_PIX_CEIL( cbox.xMax );
 167     cbox.yMax = FT_PIX_CEIL( cbox.yMax );
 168
 169     width  = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 );
 170     height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 );
 171     bitmap = &slot->bitmap;
 172     memory = render->root.memory;
 173
 174     /* release old bitmap buffer */
 175     if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
 176     {
 177       FT_FREE( bitmap->buffer );
 178       slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
 179     }
 180
 181     /* allocate new one, depends on pixel format */
 182     if ( !( mode & FT_RENDER_MODE_MONO ) )
 183     {
 184       /* we pad to 32 bits, only for backwards compatibility with FT 1.x */
 185       pitch              = FT_PAD_CEIL( width, 4 );
 186       bitmap->pixel_mode = FT_PIXEL_MODE_GRAY;
 187       bitmap->num_grays  = 256;
 188     }
 189     else
 190     {
 191       pitch              = ( ( width + 15 ) >> 4 ) << 1;
 192       bitmap->pixel_mode = FT_PIXEL_MODE_MONO;
 193     }
 194
 195     bitmap->width = width;
 196     bitmap->rows  = height;
 197     bitmap->pitch = pitch;
 198
 199     if ( FT_ALLOC_MULT( bitmap->buffer, pitch, height ) )
 200       goto Exit;
 201
 202     slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
 203
 204     /* translate outline to render it into the bitmap */
 205     FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin );
 206
 207     /* set up parameters */
 208     params.target = bitmap;
 209     params.source = outline;
 210     params.flags  = 0;
 211
 212     if ( bitmap->pixel_mode == FT_PIXEL_MODE_GRAY )
 213       params.flags |= FT_RASTER_FLAG_AA;
 214
 215     /* render outline into the bitmap */
 216     error = render->raster_render( render->raster, &params );
 217
 218     FT_Outline_Translate( outline, cbox.xMin, cbox.yMin );
 219
 220     if ( error )
 221       goto Exit;
 222
 223     slot->format      = FT_GLYPH_FORMAT_BITMAP;
 224     slot->bitmap_left = (FT_Int)( cbox.xMin >> 6 );
 225     slot->bitmap_top  = (FT_Int)( cbox.yMax >> 6 );
 226
 227   Exit:
 228     return error;
 229   }
 230
 231
 232   FT_DEFINE_RENDERER(ft_raster1_renderer_class,
 233
 234       FT_MODULE_RENDERER,
 235       sizeof( FT_RendererRec ),
 236
 237       "raster1",
 238       0x10000L,
 239       0x20000L,
 240
 241       0,    /* module specific interface */
 242
 243       (FT_Module_Constructor)ft_raster1_init,
 244       (FT_Module_Destructor) 0,
 245       (FT_Module_Requester)  0
 246     ,
 247
 248     FT_GLYPH_FORMAT_OUTLINE,
 249
 250     (FT_Renderer_RenderFunc)   ft_raster1_render,
 251     (FT_Renderer_TransformFunc)ft_raster1_transform,
 252     (FT_Renderer_GetCBoxFunc)  ft_raster1_get_cbox,
 253     (FT_Renderer_SetModeFunc)  ft_raster1_set_mode,
 254
 255     (FT_Raster_Funcs*)    &FT_STANDARD_RASTER_GET
 256   )
 257
 258
 259   /* This renderer is _NOT_ part of the default modules; you will need */
 260   /* to register it by hand in your application.  It should only be    */
 261   /* used for backwards-compatibility with FT 1.x anyway.              */
 262   /*                                                                   */
 263   FT_DEFINE_RENDERER(ft_raster5_renderer_class,
 264
 265
 266       FT_MODULE_RENDERER,
 267       sizeof( FT_RendererRec ),
 268
 269       "raster5",
 270       0x10000L,
 271       0x20000L,
 272
 273       0,    /* module specific interface */
 274
 275       (FT_Module_Constructor)ft_raster1_init,
 276       (FT_Module_Destructor) 0,
 277       (FT_Module_Requester)  0
 278     ,
 279
 280     FT_GLYPH_FORMAT_OUTLINE,
 281
 282     (FT_Renderer_RenderFunc)   ft_raster1_render,
 283     (FT_Renderer_TransformFunc)ft_raster1_transform,
 284     (FT_Renderer_GetCBoxFunc)  ft_raster1_get_cbox,
 285     (FT_Renderer_SetModeFunc)  ft_raster1_set_mode,
 286
 287     (FT_Raster_Funcs*)    &FT_STANDARD_RASTER_GET
 288   )
 289
 290
 291 /* END */