reactos/lib/3rdparty/freetype/src/raster/ftrend1.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ftrend1.c                                                              */
   4 /*                                                                         */
   5 /*    The FreeType glyph rasterizer interface (body).                      */
   6 /*                                                                         */
   7 /*  Copyright 1996-2003, 2005, 2006, 2011, 2013 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_DEBUG_H
  21 #include FT_INTERNAL_OBJECTS_H
  22 #include FT_OUTLINE_H
  23 #include "ftrend1.h"
  24 #include "ftraster.h"
  25 #include "rastpic.h"
  26
  27 #include "rasterrs.h"
  28
  29
  30   /* initialize renderer -- init its raster */
  31   static FT_Error
  32   ft_raster1_init( FT_Renderer  render )
  33   {
  34     FT_Library  library = FT_MODULE_LIBRARY( render );
  35
  36
  37     render->clazz->raster_class->raster_reset( render->raster,
  38                                                library->raster_pool,
  39                                                library->raster_pool_size );
  40
  41     return FT_Err_Ok;
  42   }
  43
  44
  45   /* set render-specific mode */
  46   static FT_Error
  47   ft_raster1_set_mode( FT_Renderer  render,
  48                        FT_ULong     mode_tag,
  49                        FT_Pointer   data )
  50   {
  51     /* we simply pass it to the raster */
  52     return render->clazz->raster_class->raster_set_mode( render->raster,
  53                                                          mode_tag,
  54                                                          data );
  55   }
  56
  57
  58   /* transform a given glyph image */
  59   static FT_Error
  60   ft_raster1_transform( FT_Renderer       render,
  61                         FT_GlyphSlot      slot,
  62                         const FT_Matrix*  matrix,
  63                         const FT_Vector*  delta )
  64   {
  65     FT_Error error = FT_Err_Ok;
  66
  67
  68     if ( slot->format != render->glyph_format )
  69     {
  70       error = FT_THROW( Invalid_Argument );
  71       goto Exit;
  72     }
  73
  74     if ( matrix )
  75       FT_Outline_Transform( &slot->outline, matrix );
  76
  77     if ( delta )
  78       FT_Outline_Translate( &slot->outline, delta->x, delta->y );
  79
  80   Exit:
  81     return error;
  82   }
  83
  84
  85   /* return the glyph's control box */
  86   static void
  87   ft_raster1_get_cbox( FT_Renderer   render,
  88                        FT_GlyphSlot  slot,
  89                        FT_BBox*      cbox )
  90   {
  91     FT_MEM_ZERO( cbox, sizeof ( *cbox ) );
  92
  93     if ( slot->format == render->glyph_format )
  94       FT_Outline_Get_CBox( &slot->outline, cbox );
  95   }
  96
  97
  98   /* convert a slot's glyph image into a bitmap */
  99   static FT_Error
 100   ft_raster1_render( FT_Renderer       render,
 101                      FT_GlyphSlot      slot,
 102                      FT_Render_Mode    mode,
 103                      const FT_Vector*  origin )
 104   {
 105     FT_Error     error;
 106     FT_Outline*  outline;
 107     FT_BBox      cbox;
 108     FT_UInt      width, height, pitch;
 109     FT_Bitmap*   bitmap;
 110     FT_Memory    memory;
 111
 112     FT_Raster_Params  params;
 113
 114
 115     /* check glyph image format */
 116     if ( slot->format != render->glyph_format )
 117     {
 118       error = FT_THROW( Invalid_Argument );
 119       goto Exit;
 120     }
 121
 122     /* check rendering mode */
 123 #ifndef FT_CONFIG_OPTION_PIC
 124     if ( mode != FT_RENDER_MODE_MONO )
 125     {
 126       /* raster1 is only capable of producing monochrome bitmaps */
 127       if ( render->clazz == &ft_raster1_renderer_class )
 128         return FT_THROW( Cannot_Render_Glyph );
 129     }
 130     else
 131     {
 132       /* raster5 is only capable of producing 5-gray-levels bitmaps */
 133       if ( render->clazz == &ft_raster5_renderer_class )
 134         return FT_THROW( Cannot_Render_Glyph );
 135     }
 136 #else /* FT_CONFIG_OPTION_PIC */
 137     /* When PIC is enabled, we cannot get to the class object      */
 138     /* so instead we check the final character in the class name   */
 139     /* ("raster5" or "raster1"). Yes this is a hack.               */
 140     /* The "correct" thing to do is have different render function */
 141     /* for each of the classes.                                    */
 142     if ( mode != FT_RENDER_MODE_MONO )
 143     {
 144       /* raster1 is only capable of producing monochrome bitmaps */
 145       if ( render->clazz->root.module_name[6] == '1' )
 146         return FT_THROW( Cannot_Render_Glyph );
 147     }
 148     else
 149     {
 150       /* raster5 is only capable of producing 5-gray-levels bitmaps */
 151       if ( render->clazz->root.module_name[6] == '5' )
 152         return FT_THROW( Cannot_Render_Glyph );
 153     }
 154 #endif /* FT_CONFIG_OPTION_PIC */
 155
 156     outline = &slot->outline;
 157
 158     /* translate the outline to the new origin if needed */
 159     if ( origin )
 160       FT_Outline_Translate( outline, origin->x, origin->y );
 161
 162     /* compute the control box, and grid fit it */
 163     FT_Outline_Get_CBox( outline, &cbox );
 164
 165     /* undocumented but confirmed: bbox values get rounded */
 166 #if 1
 167     cbox.xMin = FT_PIX_ROUND( cbox.xMin );
 168     cbox.yMin = FT_PIX_ROUND( cbox.yMin );
 169     cbox.xMax = FT_PIX_ROUND( cbox.xMax );
 170     cbox.yMax = FT_PIX_ROUND( cbox.yMax );
 171 #else
 172     cbox.xMin = FT_PIX_FLOOR( cbox.xMin );
 173     cbox.yMin = FT_PIX_FLOOR( cbox.yMin );
 174     cbox.xMax = FT_PIX_CEIL( cbox.xMax );
 175     cbox.yMax = FT_PIX_CEIL( cbox.yMax );
 176 #endif
 177
 178     width  = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 );
 179     height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 );
 180
 181     if ( width > FT_USHORT_MAX || height > FT_USHORT_MAX )
 182     {
 183       error = FT_THROW( Invalid_Argument );
 184       goto Exit;
 185     }
 186
 187     bitmap = &slot->bitmap;
 188     memory = render->root.memory;
 189
 190     /* release old bitmap buffer */
 191     if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
 192     {
 193       FT_FREE( bitmap->buffer );
 194       slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
 195     }
 196
 197     /* allocate new one, depends on pixel format */
 198     if ( !( mode & FT_RENDER_MODE_MONO ) )
 199     {
 200       /* we pad to 32 bits, only for backwards compatibility with FT 1.x */
 201       pitch              = FT_PAD_CEIL( width, 4 );
 202       bitmap->pixel_mode = FT_PIXEL_MODE_GRAY;
 203       bitmap->num_grays  = 256;
 204     }
 205     else
 206     {
 207       pitch              = ( ( width + 15 ) >> 4 ) << 1;
 208       bitmap->pixel_mode = FT_PIXEL_MODE_MONO;
 209     }
 210
 211     bitmap->width = width;
 212     bitmap->rows  = height;
 213     bitmap->pitch = pitch;
 214
 215     if ( FT_ALLOC_MULT( bitmap->buffer, pitch, height ) )
 216       goto Exit;
 217
 218     slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
 219
 220     /* translate outline to render it into the bitmap */
 221     FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin );
 222
 223     /* set up parameters */
 224     params.target = bitmap;
 225     params.source = outline;
 226     params.flags  = 0;
 227
 228     if ( bitmap->pixel_mode == FT_PIXEL_MODE_GRAY )
 229       params.flags |= FT_RASTER_FLAG_AA;
 230
 231     /* render outline into the bitmap */
 232     error = render->raster_render( render->raster, &params );
 233
 234     FT_Outline_Translate( outline, cbox.xMin, cbox.yMin );
 235
 236     if ( error )
 237       goto Exit;
 238
 239     slot->format      = FT_GLYPH_FORMAT_BITMAP;
 240     slot->bitmap_left = (FT_Int)( cbox.xMin >> 6 );
 241     slot->bitmap_top  = (FT_Int)( cbox.yMax >> 6 );
 242
 243   Exit:
 244     return error;
 245   }
 246
 247
 248   FT_DEFINE_RENDERER( ft_raster1_renderer_class,
 249
 250       FT_MODULE_RENDERER,
 251       sizeof ( FT_RendererRec ),
 252
 253       "raster1",
 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     (FT_Renderer_RenderFunc)   ft_raster1_render,
 267     (FT_Renderer_TransformFunc)ft_raster1_transform,
 268     (FT_Renderer_GetCBoxFunc)  ft_raster1_get_cbox,
 269     (FT_Renderer_SetModeFunc)  ft_raster1_set_mode,
 270
 271     (FT_Raster_Funcs*)    &FT_STANDARD_RASTER_GET
 272   )
 273
 274
 275   /* This renderer is _NOT_ part of the default modules; you will need */
 276   /* to register it by hand in your application.  It should only be    */
 277   /* used for backwards-compatibility with FT 1.x anyway.              */
 278   /*                                                                   */
 279   FT_DEFINE_RENDERER( ft_raster5_renderer_class,
 280
 281       FT_MODULE_RENDERER,
 282       sizeof ( FT_RendererRec ),
 283
 284       "raster5",
 285       0x10000L,
 286       0x20000L,
 287
 288       0,    /* module specific interface */
 289
 290       (FT_Module_Constructor)ft_raster1_init,
 291       (FT_Module_Destructor) 0,
 292       (FT_Module_Requester)  0
 293     ,
 294
 295     FT_GLYPH_FORMAT_OUTLINE,
 296
 297     (FT_Renderer_RenderFunc)   ft_raster1_render,
 298     (FT_Renderer_TransformFunc)ft_raster1_transform,
 299     (FT_Renderer_GetCBoxFunc)  ft_raster1_get_cbox,
 300     (FT_Renderer_SetModeFunc)  ft_raster1_set_mode,
 301
 302     (FT_Raster_Funcs*)    &FT_STANDARD_RASTER_GET
 303   )
 304
 305
 306 /* END */