src/freetype/smooth/ftsmooth.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ftsmooth.c                                                             */
   4 /*                                                                         */
   5 /*    Anti-aliasing renderer interface (body).                             */
   6 /*                                                                         */
   7 /*  Copyright 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 "ftsmooth.h"
  26 #include "ftgrays.h"
  27
  28 #else
  29
  30 #include <smooth/ftsmooth.h>
  31 #include <smooth/ftgrays.h>
  32
  33 #endif
  34
  35
  36   /* initialize renderer -- init its raster */
  37   static
  38   FT_Error  ft_smooth_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 0;
  48   }
  49
  50
  51   /* sets render-specific mode */
  52   static
  53   FT_Error  ft_smooth_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   /* transform a given glyph image */
  64   static
  65   FT_Error  ft_smooth_transform( FT_Renderer   render,
  66                                  FT_GlyphSlot  slot,
  67                                  FT_Matrix*    matrix,
  68                                  FT_Vector*    delta )
  69   {
  70     FT_Error  error = FT_Err_Ok;
  71
  72
  73     if ( slot->format != render->glyph_format )
  74     {
  75       error = FT_Err_Invalid_Argument;
  76       goto Exit;
  77     }
  78
  79     if ( matrix )
  80       FT_Outline_Transform( &slot->outline, matrix );
  81
  82     if ( delta )
  83       FT_Outline_Translate( &slot->outline, delta->x, delta->y );
  84
  85   Exit:
  86     return error;
  87   }
  88
  89
  90   /* return the glyph's control box */
  91   static
  92   void  ft_smooth_get_cbox( FT_Renderer   render,
  93                             FT_GlyphSlot  slot,
  94                             FT_BBox*      cbox )
  95   {
  96     MEM_Set( cbox, 0, sizeof ( *cbox ) );
  97
  98     if ( slot->format == render->glyph_format )
  99       FT_Outline_Get_CBox( &slot->outline, cbox );
 100   }
 101
 102
 103   /* convert a slot's glyph image into a bitmap */
 104   static
 105   FT_Error  ft_smooth_render( FT_Renderer   render,
 106                               FT_GlyphSlot  slot,
 107                               FT_UInt       mode,
 108                               FT_Vector*    origin )
 109   {
 110     FT_Error     error;
 111     FT_Outline*  outline;
 112     FT_BBox      cbox;
 113     FT_UInt      width, height, pitch;
 114     FT_Bitmap*   bitmap;
 115     FT_Memory    memory;
 116
 117     FT_Raster_Params  params;
 118
 119
 120     /* check glyph image format */
 121     if ( slot->format != render->glyph_format )
 122     {
 123       error = FT_Err_Invalid_Argument;
 124       goto Exit;
 125     }
 126
 127     /* check mode */
 128     if ( mode != ft_render_mode_normal )
 129       return FT_Err_Cannot_Render_Glyph;
 130
 131     outline = &slot->outline;
 132
 133     /* translate the outline to the new origin if needed */
 134     if ( origin )
 135       FT_Outline_Translate( outline, origin->x, origin->y );
 136
 137     /* compute the control box, and grid fit it */
 138     FT_Outline_Get_CBox( outline, &cbox );
 139
 140     cbox.xMin &= -64;
 141     cbox.yMin &= -64;
 142     cbox.xMax  = ( cbox.xMax + 63 ) & -64;
 143     cbox.yMax  = ( cbox.yMax + 63 ) & -64;
 144
 145     width  = ( cbox.xMax - cbox.xMin ) >> 6;
 146     height = ( cbox.yMax - cbox.yMin ) >> 6;
 147     bitmap = &slot->bitmap;
 148     memory = render->root.memory;
 149
 150     /* release old bitmap buffer */
 151     if ( slot->flags & ft_glyph_own_bitmap )
 152     {
 153       FREE( bitmap->buffer );
 154       slot->flags &= ~ft_glyph_own_bitmap;
 155     }
 156
 157     /* allocate new one, depends on pixel format */
 158     pitch = width;
 159     bitmap->pixel_mode = ft_pixel_mode_grays;
 160     bitmap->num_grays  = 256;
 161     bitmap->width      = width;
 162     bitmap->rows       = height;
 163     bitmap->pitch      = pitch;
 164
 165     if ( ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) )
 166       goto Exit;
 167
 168     slot->flags |= ft_glyph_own_bitmap;
 169
 170     /* translate outline to render it into the bitmap */
 171     FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin );
 172
 173     /* set up parameters */
 174     params.target = bitmap;
 175     params.source = outline;
 176     params.flags  = ft_raster_flag_aa;
 177
 178     /* render outline into the bitmap */
 179     error = render->raster_render( render->raster, &params );
 180     if ( error )
 181       goto Exit;
 182
 183     slot->format      = ft_glyph_format_bitmap;
 184     slot->bitmap_left = cbox.xMin >> 6;
 185     slot->bitmap_top  = cbox.yMax >> 6;
 186
 187   Exit:
 188     return error;
 189   }
 190
 191
 192   const FT_Renderer_Class  ft_smooth_renderer_class =
 193   {
 194     {
 195       ft_module_renderer,
 196       sizeof( FT_RendererRec ),
 197
 198       "smooth",
 199       0x10000L,
 200       0x20000L,
 201
 202       0,    /* module specific interface */
 203
 204       (FT_Module_Constructor)ft_smooth_init,
 205       (FT_Module_Destructor) 0,
 206       (FT_Module_Requester)  0
 207     },
 208
 209     ft_glyph_format_outline,
 210
 211     (FTRenderer_render)   ft_smooth_render,
 212     (FTRenderer_transform)ft_smooth_transform,
 213     (FTRenderer_getCBox)  ft_smooth_get_cbox,
 214     (FTRenderer_setMode)  ft_smooth_set_mode,
 215
 216     (FT_Raster_Funcs*)    &ft_grays_raster
 217   };
 218
 219
 220 /* END */