lib/freetype/src/type1/t1gload.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  t1gload.c                                                              */
   4 /*                                                                         */
   5 /*    Type 1 Glyph Loader (body).                                          */
   6 /*                                                                         */
   7 /*  Copyright 1996-2001, 2002 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
  29   /*************************************************************************/
  30   /*                                                                       */
  31   /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  32   /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  33   /* messages during execution.                                            */
  34   /*                                                                       */
  35 #undef  FT_COMPONENT
  36 #define FT_COMPONENT  trace_t1gload
  37
  38
  39   /*************************************************************************/
  40   /*************************************************************************/
  41   /*************************************************************************/
  42   /**********                                                      *********/
  43   /**********            COMPUTE THE MAXIMUM ADVANCE WIDTH         *********/
  44   /**********                                                      *********/
  45   /**********    The following code is in charge of computing      *********/
  46   /**********    the maximum advance width of the font.  It        *********/
  47   /**********    quickly processes each glyph charstring to        *********/
  48   /**********    extract the value from either a `sbw' or `seac'   *********/
  49   /**********    operator.                                         *********/
  50   /**********                                                      *********/
  51   /*************************************************************************/
  52   /*************************************************************************/
  53   /*************************************************************************/
  54
  55
  56   FT_LOCAL_DEF( FT_Error )
  57   T1_Parse_Glyph_And_Get_Char_String( T1_Decoder  decoder,
  58                                       FT_UInt     glyph_index,
  59                                       FT_Data*    char_string )
  60   {
  61     T1_Face   face  = (T1_Face)decoder->builder.face;
  62     T1_Font   type1 = &face->type1;
  63     FT_Error  error = 0;
  64
  65
  66     decoder->font_matrix = type1->font_matrix;
  67     decoder->font_offset = type1->font_offset;
  68
  69 #ifdef FT_CONFIG_OPTION_INCREMENTAL
  70
  71     /* For incremental fonts get the character data using the */
  72     /* callback function.                                     */
  73     if ( face->root.internal->incremental_interface )
  74       error = face->root.internal->incremental_interface->funcs->get_glyph_data(
  75                 face->root.internal->incremental_interface->object,
  76                 glyph_index, char_string );
  77     else
  78
  79 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
  80
  81     /* For ordinary fonts get the character data stored in the face record. */
  82     {
  83       char_string->pointer = type1->charstrings[glyph_index];
  84       char_string->length  = type1->charstrings_len[glyph_index];
  85     }
  86
  87     if ( !error )
  88       error = decoder->funcs.parse_charstrings(
  89                 decoder, (FT_Byte*)char_string->pointer,
  90                 char_string->length );
  91
  92 #ifdef FT_CONFIG_OPTION_INCREMENTAL
  93
  94     /* Incremental fonts can optionally override the metrics. */
  95     if ( !error && face->root.internal->incremental_interface                 &&
  96          face->root.internal->incremental_interface->funcs->get_glyph_metrics )
  97     {
  98       FT_Incremental_MetricsRec  metrics;
  99
 100       metrics.bearing_x = decoder->builder.left_bearing.x;
 101           metrics.bearing_y = decoder->builder.left_bearing.y;
 102           metrics.advance   = decoder->builder.advance.x;
 103       error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
 104                 face->root.internal->incremental_interface->object,
 105                 glyph_index, FALSE, &metrics );
 106       decoder->builder.left_bearing.x = metrics.bearing_x;
 107       decoder->builder.left_bearing.y = metrics.bearing_y;
 108       decoder->builder.advance.x      = metrics.advance;
 109       decoder->builder.advance.y      = 0;
 110     }
 111
 112 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
 113
 114   return error;
 115   }
 116
 117
 118   FT_CALLBACK_DEF( FT_Error )
 119   T1_Parse_Glyph( T1_Decoder  decoder,
 120                   FT_UInt     glyph_index )
 121   {
 122     FT_Data   glyph_data;
 123     FT_Error  error = T1_Parse_Glyph_And_Get_Char_String(
 124                         decoder, glyph_index, &glyph_data );
 125
 126
 127 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 128     if ( !error )
 129     {
 130       T1_Face  face = (T1_Face)decoder->builder.face;
 131
 132
 133           if ( face->root.internal->incremental_interface )
 134         face->root.internal->incremental_interface->funcs->free_glyph_data(
 135           face->root.internal->incremental_interface->object,
 136           &glyph_data );
 137     }
 138 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
 139
 140     return error;
 141   }
 142
 143
 144   FT_LOCAL_DEF( FT_Error )
 145   T1_Compute_Max_Advance( T1_Face  face,
 146                           FT_Int*  max_advance )
 147   {
 148     FT_Error       error;
 149     T1_DecoderRec  decoder;
 150     FT_Int         glyph_index;
 151     T1_Font        type1 = &face->type1;
 152     PSAux_Service  psaux = (PSAux_Service)face->psaux;
 153
 154
 155     *max_advance = 0;
 156
 157     /* initialize load decoder */
 158     error = psaux->t1_decoder_funcs->init( &decoder,
 159                                            (FT_Face)face,
 160                                            0, /* size       */
 161                                            0, /* glyph slot */
 162                                            (FT_Byte**)type1->glyph_names,
 163                                            face->blend,
 164                                            0,
 165                                            FT_RENDER_MODE_NORMAL,
 166                                            T1_Parse_Glyph );
 167     if ( error )
 168       return error;
 169
 170     decoder.builder.metrics_only = 1;
 171     decoder.builder.load_points  = 0;
 172
 173     decoder.num_subrs = type1->num_subrs;
 174     decoder.subrs     = type1->subrs;
 175     decoder.subrs_len = type1->subrs_len;
 176
 177     *max_advance = 0;
 178
 179     /* for each glyph, parse the glyph charstring and extract */
 180     /* the advance width                                      */
 181     for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ )
 182     {
 183       /* now get load the unscaled outline */
 184       error = T1_Parse_Glyph( &decoder, glyph_index );
 185       if ( glyph_index == 0 || decoder.builder.advance.x > *max_advance )
 186         *max_advance = decoder.builder.advance.x;
 187
 188       /* ignore the error if one occured - skip to next glyph */
 189     }
 190
 191     return T1_Err_Ok;
 192   }
 193
 194
 195   /*************************************************************************/
 196   /*************************************************************************/
 197   /*************************************************************************/
 198   /**********                                                      *********/
 199   /**********               UNHINTED GLYPH LOADER                  *********/
 200   /**********                                                      *********/
 201   /**********    The following code is in charge of loading a      *********/
 202   /**********    single outline.  It completely ignores hinting    *********/
 203   /**********    and is used when FT_LOAD_NO_HINTING is set.       *********/
 204   /**********                                                      *********/
 205   /**********      The Type 1 hinter is located in `t1hint.c'      *********/
 206   /**********                                                      *********/
 207   /*************************************************************************/
 208   /*************************************************************************/
 209   /*************************************************************************/
 210
 211
 212   FT_LOCAL_DEF( FT_Error )
 213   T1_Load_Glyph( T1_GlyphSlot  glyph,
 214                  T1_Size       size,
 215                  FT_UInt       glyph_index,
 216                  FT_Int32      load_flags )
 217   {
 218     FT_Error                error;
 219     T1_DecoderRec           decoder;
 220     T1_Face                 face = (T1_Face)glyph->root.face;
 221     FT_Bool                 hinting;
 222     T1_Font                 type1         = &face->type1;
 223     PSAux_Service           psaux         = (PSAux_Service)face->psaux;
 224     const T1_Decoder_Funcs  decoder_funcs = psaux->t1_decoder_funcs;
 225
 226     FT_Matrix               font_matrix;
 227     FT_Vector               font_offset;
 228     FT_Data                 glyph_data;
 229     FT_Bool                 glyph_data_loaded = 0;
 230
 231
 232     if ( load_flags & FT_LOAD_NO_RECURSE )
 233       load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
 234
 235     glyph->x_scale = size->root.metrics.x_scale;
 236     glyph->y_scale = size->root.metrics.y_scale;
 237
 238     glyph->root.outline.n_points   = 0;
 239     glyph->root.outline.n_contours = 0;
 240
 241     hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
 242                        ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
 243
 244     glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
 245
 246     error = decoder_funcs->init( &decoder,
 247                                  (FT_Face)face,
 248                                  (FT_Size)size,
 249                                  (FT_GlyphSlot)glyph,
 250                                  (FT_Byte**)type1->glyph_names,
 251                                  face->blend,
 252                                  FT_BOOL( hinting ),
 253                                  FT_LOAD_TARGET_MODE(load_flags),
 254                                  T1_Parse_Glyph );
 255     if ( error )
 256       goto Exit;
 257
 258     decoder.builder.no_recurse = FT_BOOL(
 259                                    ( load_flags & FT_LOAD_NO_RECURSE ) != 0 );
 260
 261     decoder.num_subrs = type1->num_subrs;
 262     decoder.subrs     = type1->subrs;
 263     decoder.subrs_len = type1->subrs_len;
 264
 265     /* now load the unscaled outline */
 266     error = T1_Parse_Glyph_And_Get_Char_String( &decoder, glyph_index,
 267                                                 &glyph_data );
 268     if ( error )
 269       goto Exit;
 270     glyph_data_loaded = 1;
 271
 272     font_matrix = decoder.font_matrix;
 273     font_offset = decoder.font_offset;
 274
 275     /* save new glyph tables */
 276     decoder_funcs->done( &decoder );
 277
 278     /* now, set the metrics -- this is rather simple, as   */
 279     /* the left side bearing is the xMin, and the top side */
 280     /* bearing the yMax                                    */
 281     if ( !error )
 282     {
 283       glyph->root.outline.flags &= FT_OUTLINE_OWNER;
 284       glyph->root.outline.flags |= FT_OUTLINE_REVERSE_FILL;
 285
 286       /* for composite glyphs, return only left side bearing and */
 287       /* advance width                                           */
 288       if ( load_flags & FT_LOAD_NO_RECURSE )
 289       {
 290         FT_Slot_Internal  internal = glyph->root.internal;
 291
 292
 293         glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
 294         glyph->root.metrics.horiAdvance  = decoder.builder.advance.x;
 295         internal->glyph_matrix           = font_matrix;
 296         internal->glyph_delta            = font_offset;
 297         internal->glyph_transformed      = 1;
 298       }
 299       else
 300       {
 301         FT_BBox            cbox;
 302         FT_Glyph_Metrics*  metrics = &glyph->root.metrics;
 303
 304
 305         /* copy the _unscaled_ advance width */
 306         metrics->horiAdvance                    = decoder.builder.advance.x;
 307         glyph->root.linearHoriAdvance           = decoder.builder.advance.x;
 308         glyph->root.internal->glyph_transformed = 0;
 309
 310         /* make up vertical metrics */
 311         metrics->vertBearingX = 0;
 312         metrics->vertBearingY = 0;
 313         metrics->vertAdvance  = 0;
 314
 315         glyph->root.linearVertAdvance = 0;
 316
 317         glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
 318
 319         if ( size && size->root.metrics.y_ppem < 24 )
 320           glyph->root.outline.flags |= FT_OUTLINE_HIGH_PRECISION;
 321
 322 #if 1
 323         /* apply the font matrix, if any */
 324         FT_Outline_Transform( &glyph->root.outline, &font_matrix );
 325
 326         FT_Outline_Translate( &glyph->root.outline,
 327                               font_offset.x,
 328                               font_offset.y );
 329 #endif
 330
 331         if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
 332         {
 333           /* scale the outline and the metrics */
 334           FT_Int       n;
 335           FT_Outline*  cur = decoder.builder.base;
 336           FT_Vector*   vec = cur->points;
 337           FT_Fixed     x_scale = glyph->x_scale;
 338           FT_Fixed     y_scale = glyph->y_scale;
 339
 340
 341           /* First of all, scale the points, if we are not hinting */
 342           if ( !hinting )
 343             for ( n = cur->n_points; n > 0; n--, vec++ )
 344             {
 345               vec->x = FT_MulFix( vec->x, x_scale );
 346               vec->y = FT_MulFix( vec->y, y_scale );
 347             }
 348
 349           FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
 350
 351           /* Then scale the metrics */
 352           metrics->horiAdvance  = FT_MulFix( metrics->horiAdvance,  x_scale );
 353           metrics->vertAdvance  = FT_MulFix( metrics->vertAdvance,  y_scale );
 354
 355           metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
 356           metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );
 357
 358           if ( hinting )
 359           {
 360             metrics->horiAdvance = ( metrics->horiAdvance + 32 ) & -64;
 361             metrics->vertAdvance = ( metrics->vertAdvance + 32 ) & -64;
 362
 363             metrics->vertBearingX = ( metrics->vertBearingX + 32 ) & -64;
 364             metrics->vertBearingY = ( metrics->vertBearingY + 32 ) & -64;
 365           }
 366         }
 367
 368         /* compute the other metrics */
 369         FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
 370
 371         /* grid fit the bounding box if necessary */
 372         if ( hinting )
 373         {
 374           cbox.xMin &= -64;
 375           cbox.yMin &= -64;
 376           cbox.xMax  = ( cbox.xMax+63 ) & -64;
 377           cbox.yMax  = ( cbox.yMax+63 ) & -64;
 378         }
 379
 380         metrics->width  = cbox.xMax - cbox.xMin;
 381         metrics->height = cbox.yMax - cbox.yMin;
 382
 383         metrics->horiBearingX = cbox.xMin;
 384         metrics->horiBearingY = cbox.yMax;
 385       }
 386
 387       /* Set control data to the glyph charstrings.  Note that this is */
 388       /* _not_ zero-terminated.                                        */
 389       glyph->root.control_data = (FT_Byte*)glyph_data.pointer;
 390       glyph->root.control_len  = glyph_data.length;
 391     }
 392
 393
 394   Exit:
 395
 396 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 397     if ( glyph_data_loaded && face->root.internal->incremental_interface )
 398     {
 399       face->root.internal->incremental_interface->funcs->free_glyph_data(
 400         face->root.internal->incremental_interface->object,
 401         &glyph_data );
 402
 403       /* Set the control data to null - it is no longer available if   */
 404       /* loaded incrementally.                                         */
 405       glyph->root.control_data = 0;
 406       glyph->root.control_len  = 0;
 407     }
 408 #endif
 409
 410     return error;
 411   }
 412
 413
 414 /* END */