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

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ftrend1.c                                                              */
   4 /*                                                                         */
   5 /*    The FreeType glyph rasterizer interface (body).                      */
   6 /*                                                                         */
   7 /*  Copyright 1996-2016 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, cbox0;
 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     if ( mode != FT_RENDER_MODE_MONO )
 124     {
 125       /* raster1 is only capable of producing monochrome bitmaps */
 126       return FT_THROW( Cannot_Render_Glyph );
 127     }
 128
 129     outline = &slot->outline;
 130
 131     /* translate the outline to the new origin if needed */
 132     if ( origin )
 133       FT_Outline_Translate( outline, origin->x, origin->y );
 134
 135     /* compute the control box, and grid fit it */
 136     FT_Outline_Get_CBox( outline, &cbox0 );
 137
 138     /* undocumented but confirmed: bbox values get rounded */
 139 #if 1
 140     cbox.xMin = FT_PIX_ROUND( cbox0.xMin );
 141     cbox.yMin = FT_PIX_ROUND( cbox0.yMin );
 142     cbox.xMax = FT_PIX_ROUND( cbox0.xMax );
 143     cbox.yMax = FT_PIX_ROUND( cbox0.yMax );
 144 #else
 145     cbox.xMin = FT_PIX_FLOOR( cbox.xMin );
 146     cbox.yMin = FT_PIX_FLOOR( cbox.yMin );
 147     cbox.xMax = FT_PIX_CEIL( cbox.xMax );
 148     cbox.yMax = FT_PIX_CEIL( cbox.yMax );
 149 #endif
 150
 151     /* If either `width' or `height' round to 0, try    */
 152     /* explicitly rounding up/down.  In the case of     */
 153     /* glyphs containing only one very narrow feature,  */
 154     /* this gives the drop-out compensation in the scan */
 155     /* conversion code a chance to do its stuff.        */
 156     width  = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 );
 157     if ( width == 0 )
 158     {
 159       cbox.xMin = FT_PIX_FLOOR( cbox0.xMin );
 160       cbox.xMax = FT_PIX_CEIL( cbox0.xMax );
 161
 162       width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 );
 163     }
 164
 165     height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 );
 166     if ( height == 0 )
 167     {
 168       cbox.yMin = FT_PIX_FLOOR( cbox0.yMin );
 169       cbox.yMax = FT_PIX_CEIL( cbox0.yMax );
 170
 171       height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 );
 172     }
 173
 174     if ( width > FT_USHORT_MAX || height > FT_USHORT_MAX )
 175     {
 176       error = FT_THROW( Invalid_Argument );
 177       goto Exit;
 178     }
 179
 180     bitmap = &slot->bitmap;
 181     memory = render->root.memory;
 182
 183     /* release old bitmap buffer */
 184     if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
 185     {
 186       FT_FREE( bitmap->buffer );
 187       slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
 188     }
 189
 190     pitch              = ( ( width + 15 ) >> 4 ) << 1;
 191     bitmap->pixel_mode = FT_PIXEL_MODE_MONO;
 192
 193     bitmap->width = width;
 194     bitmap->rows  = height;
 195     bitmap->pitch = (int)pitch;
 196
 197     if ( FT_ALLOC_MULT( bitmap->buffer, pitch, height ) )
 198       goto Exit;
 199
 200     slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
 201
 202     /* translate outline to render it into the bitmap */
 203     FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin );
 204
 205     /* set up parameters */
 206     params.target = bitmap;
 207     params.source = outline;
 208     params.flags  = 0;
 209
 210     /* render outline into the bitmap */
 211     error = render->raster_render( render->raster, &params );
 212
 213     FT_Outline_Translate( outline, cbox.xMin, cbox.yMin );
 214
 215     if ( error )
 216       goto Exit;
 217
 218     slot->format      = FT_GLYPH_FORMAT_BITMAP;
 219     slot->bitmap_left = (FT_Int)( cbox.xMin >> 6 );
 220     slot->bitmap_top  = (FT_Int)( cbox.yMax >> 6 );
 221
 222   Exit:
 223     return error;
 224   }
 225
 226
 227   FT_DEFINE_RENDERER( ft_raster1_renderer_class,
 228
 229       FT_MODULE_RENDERER,
 230       sizeof ( FT_RendererRec ),
 231
 232       "raster1",
 233       0x10000L,
 234       0x20000L,
 235
 236       0,    /* module specific interface */
 237
 238       (FT_Module_Constructor)ft_raster1_init,
 239       (FT_Module_Destructor) 0,
 240       (FT_Module_Requester)  0
 241     ,
 242
 243     FT_GLYPH_FORMAT_OUTLINE,
 244
 245     (FT_Renderer_RenderFunc)   ft_raster1_render,
 246     (FT_Renderer_TransformFunc)ft_raster1_transform,
 247     (FT_Renderer_GetCBoxFunc)  ft_raster1_get_cbox,
 248     (FT_Renderer_SetModeFunc)  ft_raster1_set_mode,
 249
 250     (FT_Raster_Funcs*)    &FT_STANDARD_RASTER_GET
 251   )
 252
 253
 254 /* END */