libraries/freetype-2.0.5/t1gload.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  t1gload.c                                                              */
   4 /*                                                                         */
   5 /*    Type 1 Glyph Loader (body).                                          */
   6 /*                                                                         */
   7 /*  Copyright 1996-2001 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 "t1gload.h"
  21 #include FT_INTERNAL_DEBUG_H
  22 #include FT_INTERNAL_STREAM_H
  23 #include FT_OUTLINE_H
  24 #include FT_INTERNAL_POSTSCRIPT_AUX_H
  25
  26 #include "t1errors.h"
  27
  28 #include <string.h>     /* for strcmp() */
  29
  30
  31   /*************************************************************************/
  32   /*                                                                       */
  33   /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  34   /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  35   /* messages during execution.                                            */
  36   /*                                                                       */
  37 #undef  FT_COMPONENT
  38 #define FT_COMPONENT  trace_t1gload
  39
  40
  41   /*************************************************************************/
  42   /*************************************************************************/
  43   /*************************************************************************/
  44   /**********                                                      *********/
  45   /**********            COMPUTE THE MAXIMUM ADVANCE WIDTH         *********/
  46   /**********                                                      *********/
  47   /**********    The following code is in charge of computing      *********/
  48   /**********    the maximum advance width of the font.  It        *********/
  49   /**********    quickly processes each glyph charstring to        *********/
  50   /**********    extract the value from either a `sbw' or `seac'   *********/
  51   /**********    operator.                                         *********/
  52   /**********                                                      *********/
  53   /*************************************************************************/
  54   /*************************************************************************/
  55   /*************************************************************************/
  56
  57
  58   FT_CALLBACK_DEF( FT_Error )
  59   T1_Parse_Glyph( T1_Decoder*  decoder,
  60                   FT_UInt      glyph_index )
  61   {
  62     T1_Face   face  = (T1_Face)decoder->builder.face;
  63     T1_Font*  type1 = &face->type1;
  64
  65
  66     decoder->font_matrix = type1->font_matrix;
  67     decoder->font_offset = type1->font_offset;
  68
  69     return decoder->funcs.parse_charstrings(
  70                       decoder,
  71                       type1->charstrings    [glyph_index],
  72                       type1->charstrings_len[glyph_index] );
  73   }
  74
  75
  76   FT_LOCAL_DEF FT_Error
  77   T1_Compute_Max_Advance( T1_Face  face,
  78                           FT_Int*  max_advance )
  79   {
  80     FT_Error          error;
  81     T1_Decoder        decoder;
  82     FT_Int            glyph_index;
  83     T1_Font*          type1 = &face->type1;
  84     PSAux_Interface*  psaux = (PSAux_Interface*)face->psaux;
  85
  86
  87     *max_advance = 0;
  88
  89     /* initialize load decoder */
  90     error = psaux->t1_decoder_funcs->init( &decoder,
  91                                            (FT_Face)face,
  92                                            0, /* size       */
  93                                            0, /* glyph slot */
  94                                            (FT_Byte**)type1->glyph_names,
  95                                            face->blend,
  96                                            T1_Parse_Glyph );
  97     if ( error )
  98       return error;
  99
 100     decoder.builder.metrics_only = 1;
 101     decoder.builder.load_points  = 0;
 102
 103     decoder.num_subrs = type1->num_subrs;
 104     decoder.subrs     = type1->subrs;
 105     decoder.subrs_len = type1->subrs_len;
 106
 107     /* for each glyph, parse the glyph charstring and extract */
 108     /* the advance width                                      */
 109     for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ )
 110     {
 111       /* now get load the unscaled outline */
 112       error = T1_Parse_Glyph( &decoder, glyph_index );
 113       /* ignore the error if one occured - skip to next glyph */
 114     }
 115
 116     *max_advance = decoder.builder.advance.x;
 117     return T1_Err_Ok;
 118   }
 119
 120
 121   /*************************************************************************/
 122   /*************************************************************************/
 123   /*************************************************************************/
 124   /**********                                                      *********/
 125   /**********               UNHINTED GLYPH LOADER                  *********/
 126   /**********                                                      *********/
 127   /**********    The following code is in charge of loading a      *********/
 128   /**********    single outline.  It completely ignores hinting    *********/
 129   /**********    and is used when FT_LOAD_NO_HINTING is set.       *********/
 130   /**********                                                      *********/
 131   /**********      The Type 1 hinter is located in `t1hint.c'      *********/
 132   /**********                                                      *********/
 133   /*************************************************************************/
 134   /*************************************************************************/
 135   /*************************************************************************/
 136
 137
 138   FT_LOCAL_DEF FT_Error
 139   T1_Load_Glyph( T1_GlyphSlot  glyph,
 140                  T1_Size       size,
 141                  FT_Int        glyph_index,
 142                  FT_Int        load_flags )
 143   {
 144     FT_Error                error;
 145     T1_Decoder              decoder;
 146     T1_Face                 face = (T1_Face)glyph->root.face;
 147     FT_Bool                 hinting;
 148     T1_Font*                type1         = &face->type1;
 149     PSAux_Interface*        psaux         = (PSAux_Interface*)face->psaux;
 150     const T1_Decoder_Funcs* decoder_funcs = psaux->t1_decoder_funcs;
 151
 152     FT_Matrix               font_matrix;
 153     FT_Vector               font_offset;
 154
 155     if ( load_flags & FT_LOAD_NO_RECURSE )
 156       load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
 157
 158     glyph->x_scale = size->root.metrics.x_scale;
 159     glyph->y_scale = size->root.metrics.y_scale;
 160
 161     glyph->root.outline.n_points   = 0;
 162     glyph->root.outline.n_contours = 0;
 163
 164     hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
 165                        ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
 166
 167     glyph->root.format = ft_glyph_format_outline;
 168
 169     error = decoder_funcs->init( &decoder,
 170                                  (FT_Face)face,
 171                                  (FT_Size)size,
 172                                  (FT_GlyphSlot)glyph,
 173                                  (FT_Byte**)type1->glyph_names,
 174                                  face->blend,
 175                                  T1_Parse_Glyph );
 176     if ( error )
 177       goto Exit;
 178
 179     decoder.builder.no_recurse = FT_BOOL(
 180                                    ( load_flags & FT_LOAD_NO_RECURSE ) != 0 );
 181
 182     decoder.num_subrs = type1->num_subrs;
 183     decoder.subrs     = type1->subrs;
 184     decoder.subrs_len = type1->subrs_len;
 185
 186
 187     /* now load the unscaled outline */
 188     error = T1_Parse_Glyph( &decoder, glyph_index );
 189     if ( error )
 190       goto Exit;
 191
 192     font_matrix = decoder.font_matrix;
 193     font_offset = decoder.font_offset;
 194
 195     /* save new glyph tables */
 196     decoder_funcs->done( &decoder );
 197
 198     /* now, set the metrics -- this is rather simple, as   */
 199     /* the left side bearing is the xMin, and the top side */
 200     /* bearing the yMax                                    */
 201     if ( !error )
 202     {
 203       glyph->root.outline.flags &= ft_outline_owner;
 204       glyph->root.outline.flags |= ft_outline_reverse_fill;
 205
 206       /* for composite glyphs, return only left side bearing and */
 207       /* advance width                                           */
 208       if ( load_flags & FT_LOAD_NO_RECURSE )
 209       {
 210         FT_Slot_Internal  internal = glyph->root.internal;
 211
 212
 213         glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
 214         glyph->root.metrics.horiAdvance  = decoder.builder.advance.x;
 215         internal->glyph_matrix           = font_matrix;
 216         internal->glyph_delta            = font_offset;
 217         internal->glyph_transformed      = 1;
 218       }
 219       else
 220       {
 221         FT_BBox            cbox;
 222         FT_Glyph_Metrics*  metrics = &glyph->root.metrics;
 223
 224
 225         /* copy the _unscaled_ advance width */
 226         metrics->horiAdvance                    = decoder.builder.advance.x;
 227         glyph->root.linearHoriAdvance           = decoder.builder.advance.x;
 228         glyph->root.internal->glyph_transformed = 0;
 229
 230         /* make up vertical metrics */
 231         metrics->vertBearingX = 0;
 232         metrics->vertBearingY = 0;
 233         metrics->vertAdvance  = 0;
 234
 235         glyph->root.linearVertAdvance = 0;
 236
 237         glyph->root.format = ft_glyph_format_outline;
 238
 239         if ( size && size->root.metrics.y_ppem < 24 )
 240           glyph->root.outline.flags |= ft_outline_high_precision;
 241
 242         /* apply the font matrix */
 243         FT_Outline_Transform( &glyph->root.outline, &font_matrix );
 244
 245         FT_Outline_Translate( &glyph->root.outline,
 246                               font_offset.x,
 247                               font_offset.y );
 248
 249 #if 0
 250
 251         glyph->root.outline.second_pass    = TRUE;
 252         glyph->root.outline.high_precision = size->root.metrics.y_ppem < 24;
 253         glyph->root.outline.dropout_mode   = 2;
 254
 255 #endif /* 0 */
 256
 257         if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
 258         {
 259           /* scale the outline and the metrics */
 260           FT_Int       n;
 261           FT_Outline*  cur = decoder.builder.base;
 262           FT_Vector*   vec = cur->points;
 263           FT_Fixed     x_scale = glyph->x_scale;
 264           FT_Fixed     y_scale = glyph->y_scale;
 265
 266
 267           /* First of all, scale the points */
 268           for ( n = cur->n_points; n > 0; n--, vec++ )
 269           {
 270             vec->x = FT_MulFix( vec->x, x_scale );
 271             vec->y = FT_MulFix( vec->y, y_scale );
 272           }
 273
 274           FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
 275
 276           /* Then scale the metrics */
 277           metrics->horiAdvance  = FT_MulFix( metrics->horiAdvance,  x_scale );
 278           metrics->vertAdvance  = FT_MulFix( metrics->vertAdvance,  y_scale );
 279
 280           metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
 281           metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );
 282         }
 283
 284         /* compute the other metrics */
 285         FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
 286
 287         /* grid fit the bounding box if necessary */
 288         if ( hinting )
 289         {
 290           cbox.xMin &= -64;
 291           cbox.yMin &= -64;
 292           cbox.xMax  = ( cbox.xMax+63 ) & -64;
 293           cbox.yMax  = ( cbox.yMax+63 ) & -64;
 294         }
 295
 296         metrics->width  = cbox.xMax - cbox.xMin;
 297         metrics->height = cbox.yMax - cbox.yMin;
 298
 299         metrics->horiBearingX = cbox.xMin;
 300         metrics->horiBearingY = cbox.yMax;
 301       }
 302
 303       /* Set control data to the glyph charstrings.  Note that this is */
 304       /* _not_ zero-terminated.                                        */
 305       glyph->root.control_data = type1->charstrings    [glyph_index];
 306       glyph->root.control_len  = type1->charstrings_len[glyph_index];
 307     }
 308
 309   Exit:
 310     return error;
 311   }
 312
 313
 314 /* END */