src/freetype/raster1/ftrend1.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ftrend1.c                                                              */
   4 /*                                                                         */
   5 /*    The FreeType glyph rasterizer interface (body).                      */
   6 /*                                                                         */
   7 /*  Copyright 1996-2000 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 <freetype/internal/ftobjs.h>
  20 #include <freetype/ftoutln.h>
  21
  22
  23 #ifdef FT_FLAT_COMPILE
  24
  25 #include "ftrend1.h"
  26 #include "ftraster.h"
  27
  28 #else
  29
  30 #include <raster1/ftrend1.h>
  31 #include <raster1/ftraster.h>
  32
  33 #endif
  34
  35
  36   /* initialize renderer -- init its raster */
  37   static
  38   FT_Error  ft_raster1_init( FT_Renderer  render )
  39   {
  40     FT_Library  library = FT_MODULE_LIBRARY( render );
  41
  42
  43     render->clazz->raster_class->raster_reset( render->raster,
  44                                                library->raster_pool,
  45                                                library->raster_pool_size );
  46
  47     return FT_Err_Ok;
  48   }
  49
  50
  51   /* set render-specific mode */
  52   static
  53   FT_Error  ft_raster1_set_mode( FT_Renderer  render,
  54                                  FT_ULong     mode_tag,
  55                                  FT_Pointer   data )
  56   {
  57     /* we simply pass it to the raster */
  58     return render->clazz->raster_class->raster_set_mode( render->raster,
  59                                                          mode_tag,
  60                                                          data );
  61   }
  62
  63
  64   /* transform a given glyph image */
  65   static
  66   FT_Error  ft_raster1_transform( FT_Renderer   render,
  67                                   FT_GlyphSlot  slot,
  68                                   FT_Matrix*    matrix,
  69                                   FT_Vector*    delta )
  70   {
  71     FT_Error error = FT_Err_Ok;
  72
  73
  74     if ( slot->format != render->glyph_format )
  75     {
  76       error = FT_Err_Invalid_Argument;
  77       goto Exit;
  78     }
  79
  80     if ( matrix )
  81       FT_Outline_Transform( &slot->outline, matrix );
  82
  83     if ( delta )
  84       FT_Outline_Translate( &slot->outline, delta->x, delta->y );
  85
  86   Exit:
  87     return error;
  88   }
  89
  90
  91   /* return the glyph's control box */
  92   static
  93   void  ft_raster1_get_cbox( FT_Renderer   render,
  94                              FT_GlyphSlot  slot,
  95                              FT_BBox*      cbox )
  96   {
  97     MEM_Set( cbox, 0, sizeof ( *cbox ) );
  98
  99     if ( slot->format == render->glyph_format )
 100       FT_Outline_Get_CBox( &slot->outline, cbox );
 101   }
 102
 103
 104   /* convert a slot's glyph image into a bitmap */
 105   static
 106   FT_Error  ft_raster1_render( FT_Renderer   render,
 107                                FT_GlyphSlot  slot,
 108                                FT_UInt       mode,
 109                                FT_Vector*    origin )
 110   {
 111     FT_Error     error;
 112     FT_Outline*  outline;
 113     FT_BBox      cbox;
 114     FT_UInt      width, height, pitch;
 115     FT_Bitmap*   bitmap;
 116     FT_Memory    memory;
 117
 118     FT_Raster_Params  params;
 119
 120
 121     /* check glyph image format */
 122     if ( slot->format != render->glyph_format )
 123     {
 124       error = FT_Err_Invalid_Argument;
 125       goto Exit;
 126     }
 127
 128     /* check rendering mode */
 129     if ( mode != ft_render_mode_mono )
 130     {
 131       /* raster1 is only capable of producing monochrome bitmaps */
 132       if ( render->clazz == &ft_raster1_renderer_class )
 133         return FT_Err_Cannot_Render_Glyph;
 134     }
 135     else
 136     {
 137       /* raster5 is only capable of producing 5-gray-levels bitmaps */
 138       if ( render->clazz == &ft_raster5_renderer_class )
 139         return FT_Err_Cannot_Render_Glyph;
 140     }
 141
 142     outline = &slot->outline;
 143
 144     /* translate the outline to the new origin if needed */
 145     if ( origin )
 146       FT_Outline_Translate( outline, origin->x, origin->y );
 147
 148     /* compute the control box, and grid fit it */
 149     FT_Outline_Get_CBox( outline, &cbox );
 150
 151     cbox.xMin &= -64;
 152     cbox.yMin &= -64;
 153     cbox.xMax  = ( cbox.xMax + 63 ) & -64;
 154     cbox.yMax  = ( cbox.yMax + 63 ) & -64;
 155
 156     width  = ( cbox.xMax - cbox.xMin ) >> 6;
 157     height = ( cbox.yMax - cbox.yMin ) >> 6;
 158     bitmap = &slot->bitmap;
 159     memory = render->root.memory;
 160
 161     /* release old bitmap buffer */
 162     if ( slot->flags & ft_glyph_own_bitmap )
 163     {
 164       FREE( bitmap->buffer );
 165       slot->flags &= ~ft_glyph_own_bitmap;
 166     }
 167
 168     /* allocate new one, depends on pixel format */
 169     if ( !( mode & ft_render_mode_mono ) )
 170     {
 171       /* we pad to 32 bits, only for backwards compatibility with FT 1.x */
 172       pitch = ( width + 3 ) & -4;
 173       bitmap->pixel_mode = ft_pixel_mode_grays;
 174       bitmap->num_grays  = 256;
 175     }
 176     else
 177     {
 178       pitch = ( width + 7 ) >> 3;
 179       bitmap->pixel_mode = ft_pixel_mode_mono;
 180     }
 181
 182     bitmap->width = width;
 183     bitmap->rows  = height;
 184     bitmap->pitch = pitch;
 185
 186     if ( ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) )
 187       goto Exit;
 188
 189     slot->flags |= ft_glyph_own_bitmap;
 190
 191     /* translate outline to render it into the bitmap */
 192     FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin );
 193
 194     /* set up parameters */
 195     params.target = bitmap;
 196     params.source = outline;
 197     params.flags  = 0;
 198
 199     if ( bitmap->pixel_mode == ft_pixel_mode_grays )
 200       params.flags |= ft_raster_flag_aa;
 201
 202     /* render outline into the bitmap */
 203     error = render->raster_render( render->raster, &params );
 204     if ( error )
 205       goto Exit;
 206
 207     slot->format      = ft_glyph_format_bitmap;
 208     slot->bitmap_left = cbox.xMin >> 6;
 209     slot->bitmap_top  = cbox.yMax >> 6;
 210
 211   Exit:
 212     return error;
 213   }
 214
 215
 216   const FT_Renderer_Class  ft_raster1_renderer_class =
 217   {
 218     {
 219       ft_module_renderer,
 220       sizeof( FT_RendererRec ),
 221
 222       "raster1",
 223       0x10000L,
 224       0x20000L,
 225
 226       0,    /* module specific interface */
 227
 228       (FT_Module_Constructor)ft_raster1_init,
 229       (FT_Module_Destructor) 0,
 230       (FT_Module_Requester)  0
 231     },
 232
 233     ft_glyph_format_outline,
 234
 235     (FTRenderer_render)   ft_raster1_render,
 236     (FTRenderer_transform)ft_raster1_transform,
 237     (FTRenderer_getCBox)  ft_raster1_get_cbox,
 238     (FTRenderer_setMode)  ft_raster1_set_mode,
 239
 240     (FT_Raster_Funcs*)    &ft_standard_raster
 241   };
 242
 243
 244   /* this renderer is _NOT_ part of the default modules, you'll need */
 245   /* to register it by hand in your application.  It should only be  */
 246   /* used for backwards-compatibility with FT 1.x anyway.            */
 247   const FT_Renderer_Class  ft_raster5_renderer_class =
 248   {
 249     {
 250       ft_module_renderer,
 251       sizeof( FT_RendererRec ),
 252
 253       "raster5",
 254       0x10000L,
 255       0x20000L,
 256
 257       0,    /* module specific interface */
 258
 259       (FT_Module_Constructor)ft_raster1_init,
 260       (FT_Module_Destructor) 0,
 261       (FT_Module_Requester)  0
 262     },
 263
 264     ft_glyph_format_outline,
 265
 266     (FTRenderer_render)   ft_raster1_render,
 267     (FTRenderer_transform)ft_raster1_transform,
 268     (FTRenderer_getCBox)  ft_raster1_get_cbox,
 269     (FTRenderer_setMode)  ft_raster1_set_mode,
 270
 271     (FT_Raster_Funcs*)    &ft_standard_raster
 272   };
 273
 274
 275 /* END */