modules/freetype2/src/type1/t1gload.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  t1gload.c                                                              */
   4 /*                                                                         */
   5 /*    Type 1 Glyph Loader (body).                                          */
   6 /*                                                                         */
   7 /*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006 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 = T1_Err_Ok;
  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  = (FT_Int)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
 101       metrics.bearing_x = decoder->builder.left_bearing.x;
 102       metrics.bearing_y = decoder->builder.left_bearing.y;
 103       metrics.advance   = decoder->builder.advance.x;
 104       error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
 105                 face->root.internal->incremental_interface->object,
 106                 glyph_index, FALSE, &metrics );
 107       decoder->builder.left_bearing.x = metrics.bearing_x;
 108       decoder->builder.left_bearing.y = metrics.bearing_y;
 109       decoder->builder.advance.x      = metrics.advance;
 110       decoder->builder.advance.y      = 0;
 111     }
 112
 113 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
 114
 115     return error;
 116   }
 117
 118
 119   FT_CALLBACK_DEF( FT_Error )
 120   T1_Parse_Glyph( T1_Decoder  decoder,
 121                   FT_UInt     glyph_index )
 122   {
 123     FT_Data   glyph_data;
 124     FT_Error  error = T1_Parse_Glyph_And_Get_Char_String(
 125                         decoder, glyph_index, &glyph_data );
 126
 127
 128 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 129
 130     if ( !error )
 131     {
 132       T1_Face  face = (T1_Face)decoder->builder.face;
 133
 134
 135       if ( face->root.internal->incremental_interface )
 136         face->root.internal->incremental_interface->funcs->free_glyph_data(
 137           face->root.internal->incremental_interface->object,
 138           &glyph_data );
 139     }
 140
 141 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
 142
 143     return error;
 144   }
 145
 146
 147   FT_LOCAL_DEF( FT_Error )
 148   T1_Compute_Max_Advance( T1_Face  face,
 149                           FT_Pos*  max_advance )
 150   {
 151     FT_Error       error;
 152     T1_DecoderRec  decoder;
 153     FT_Int         glyph_index;
 154     T1_Font        type1 = &face->type1;
 155     PSAux_Service  psaux = (PSAux_Service)face->psaux;
 156
 157
 158     FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) );
 159
 160     *max_advance = 0;
 161
 162     /* initialize load decoder */
 163     error = psaux->t1_decoder_funcs->init( &decoder,
 164                                            (FT_Face)face,
 165                                            0, /* size       */
 166                                            0, /* glyph slot */
 167                                            (FT_Byte**)type1->glyph_names,
 168                                            face->blend,
 169                                            0,
 170                                            FT_RENDER_MODE_NORMAL,
 171                                            T1_Parse_Glyph );
 172     if ( error )
 173       return error;
 174
 175     decoder.builder.metrics_only = 1;
 176     decoder.builder.load_points  = 0;
 177
 178     decoder.num_subrs     = type1->num_subrs;
 179     decoder.subrs         = type1->subrs;
 180     decoder.subrs_len     = type1->subrs_len;
 181
 182     decoder.buildchar     = face->buildchar;
 183     decoder.len_buildchar = face->len_buildchar;
 184
 185     *max_advance = 0;
 186
 187     /* for each glyph, parse the glyph charstring and extract */
 188     /* the advance width                                      */
 189     for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ )
 190     {
 191       /* now get load the unscaled outline */
 192       error = T1_Parse_Glyph( &decoder, glyph_index );
 193       if ( glyph_index == 0 || decoder.builder.advance.x > *max_advance )
 194         *max_advance = decoder.builder.advance.x;
 195
 196       /* ignore the error if one occurred - skip to next glyph */
 197     }
 198
 199     psaux->t1_decoder_funcs->done( &decoder );
 200
 201     return T1_Err_Ok;
 202   }
 203
 204
 205   FT_LOCAL_DEF( FT_Error )
 206   T1_Load_Glyph( T1_GlyphSlot  glyph,
 207                  T1_Size       size,
 208                  FT_UInt       glyph_index,
 209                  FT_Int32      load_flags )
 210   {
 211     FT_Error                error;
 212     T1_DecoderRec           decoder;
 213     T1_Face                 face = (T1_Face)glyph->root.face;
 214     FT_Bool                 hinting;
 215     T1_Font                 type1         = &face->type1;
 216     PSAux_Service           psaux         = (PSAux_Service)face->psaux;
 217     const T1_Decoder_Funcs  decoder_funcs = psaux->t1_decoder_funcs;
 218
 219     FT_Matrix               font_matrix;
 220     FT_Vector               font_offset;
 221     FT_Data                 glyph_data;
 222     FT_Bool                 must_finish_decoder = FALSE;
 223 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 224     FT_Bool                 glyph_data_loaded = 0;
 225 #endif
 226
 227
 228     if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
 229     {
 230       error = T1_Err_Invalid_Argument;
 231       goto Exit;
 232     }
 233
 234     FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) );
 235
 236     if ( load_flags & FT_LOAD_NO_RECURSE )
 237       load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
 238
 239     glyph->x_scale = size->root.metrics.x_scale;
 240     glyph->y_scale = size->root.metrics.y_scale;
 241
 242     glyph->root.outline.n_points   = 0;
 243     glyph->root.outline.n_contours = 0;
 244
 245     hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
 246                        ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
 247
 248     glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
 249
 250     error = decoder_funcs->init( &decoder,
 251                                  (FT_Face)face,
 252                                  (FT_Size)size,
 253                                  (FT_GlyphSlot)glyph,
 254                                  (FT_Byte**)type1->glyph_names,
 255                                  face->blend,
 256                                  FT_BOOL( hinting ),
 257                                  FT_LOAD_TARGET_MODE( load_flags ),
 258                                  T1_Parse_Glyph );
 259     if ( error )
 260       goto Exit;
 261
 262     must_finish_decoder = TRUE;
 263
 264     decoder.builder.no_recurse = FT_BOOL(
 265                                    ( load_flags & FT_LOAD_NO_RECURSE ) != 0 );
 266
 267     decoder.num_subrs     = type1->num_subrs;
 268     decoder.subrs         = type1->subrs;
 269     decoder.subrs_len     = type1->subrs_len;
 270
 271     decoder.buildchar     = face->buildchar;
 272     decoder.len_buildchar = face->len_buildchar;
 273
 274     /* now load the unscaled outline */
 275     error = T1_Parse_Glyph_And_Get_Char_String( &decoder, glyph_index,
 276                                                 &glyph_data );
 277     if ( error )
 278       goto Exit;
 279 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 280     glyph_data_loaded = 1;
 281 #endif
 282
 283     font_matrix = decoder.font_matrix;
 284     font_offset = decoder.font_offset;
 285
 286     /* save new glyph tables */
 287     decoder_funcs->done( &decoder );
 288
 289     must_finish_decoder = FALSE;
 290
 291     /* now, set the metrics -- this is rather simple, as   */
 292     /* the left side bearing is the xMin, and the top side */
 293     /* bearing the yMax                                    */
 294     if ( !error )
 295     {
 296       glyph->root.outline.flags &= FT_OUTLINE_OWNER;
 297       glyph->root.outline.flags |= FT_OUTLINE_REVERSE_FILL;
 298
 299       /* for composite glyphs, return only left side bearing and */
 300       /* advance width                                           */
 301       if ( load_flags & FT_LOAD_NO_RECURSE )
 302       {
 303         FT_Slot_Internal  internal = glyph->root.internal;
 304
 305
 306         glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
 307         glyph->root.metrics.horiAdvance  = decoder.builder.advance.x;
 308         internal->glyph_matrix           = font_matrix;
 309         internal->glyph_delta            = font_offset;
 310         internal->glyph_transformed      = 1;
 311       }
 312       else
 313       {
 314         FT_BBox            cbox;
 315         FT_Glyph_Metrics*  metrics = &glyph->root.metrics;
 316         FT_Vector          advance;
 317
 318
 319         /* copy the _unscaled_ advance width */
 320         metrics->horiAdvance                    = decoder.builder.advance.x;
 321         glyph->root.linearHoriAdvance           = decoder.builder.advance.x;
 322         glyph->root.internal->glyph_transformed = 0;
 323
 324         /* make up vertical ones */
 325         metrics->vertAdvance = ( face->type1.font_bbox.yMax -
 326                                  face->type1.font_bbox.yMin ) >> 16;
 327         glyph->root.linearVertAdvance = metrics->vertAdvance;
 328
 329         glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
 330
 331         if ( size && size->root.metrics.y_ppem < 24 )
 332           glyph->root.outline.flags |= FT_OUTLINE_HIGH_PRECISION;
 333
 334 #if 1
 335         /* apply the font matrix, if any */
 336         if ( font_matrix.xx != 0x10000L || font_matrix.yy != font_matrix.xx ||
 337              font_matrix.xy != 0        || font_matrix.yx != 0              )
 338           FT_Outline_Transform( &glyph->root.outline, &font_matrix );
 339
 340         if ( font_offset.x || font_offset.y )
 341           FT_Outline_Translate( &glyph->root.outline,
 342                                 font_offset.x,
 343                                 font_offset.y );
 344
 345         advance.x = metrics->horiAdvance;
 346         advance.y = 0;
 347         FT_Vector_Transform( &advance, &font_matrix );
 348         metrics->horiAdvance = advance.x + font_offset.x;
 349         advance.x = 0;
 350         advance.y = metrics->vertAdvance;
 351         FT_Vector_Transform( &advance, &font_matrix );
 352         metrics->vertAdvance = advance.y + font_offset.y;
 353 #endif
 354
 355         if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
 356         {
 357           /* scale the outline and the metrics */
 358           FT_Int       n;
 359           FT_Outline*  cur = decoder.builder.base;
 360           FT_Vector*   vec = cur->points;
 361           FT_Fixed     x_scale = glyph->x_scale;
 362           FT_Fixed     y_scale = glyph->y_scale;
 363
 364
 365           /* First of all, scale the points, if we are not hinting */
 366           if ( !hinting || ! decoder.builder.hints_funcs )
 367             for ( n = cur->n_points; n > 0; n--, vec++ )
 368             {
 369               vec->x = FT_MulFix( vec->x, x_scale );
 370               vec->y = FT_MulFix( vec->y, y_scale );
 371             }
 372
 373           /* Then scale the metrics */
 374           metrics->horiAdvance  = FT_MulFix( metrics->horiAdvance,  x_scale );
 375           metrics->vertAdvance  = FT_MulFix( metrics->vertAdvance,  y_scale );
 376         }
 377
 378         /* compute the other metrics */
 379         FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
 380
 381         metrics->width  = cbox.xMax - cbox.xMin;
 382         metrics->height = cbox.yMax - cbox.yMin;
 383
 384         metrics->horiBearingX = cbox.xMin;
 385         metrics->horiBearingY = cbox.yMax;
 386
 387         /* make up vertical ones */
 388         ft_synthesize_vertical_metrics( metrics,
 389                                         metrics->vertAdvance );
 390       }
 391
 392       /* Set control data to the glyph charstrings.  Note that this is */
 393       /* _not_ zero-terminated.                                        */
 394       glyph->root.control_data = (FT_Byte*)glyph_data.pointer;
 395       glyph->root.control_len  = glyph_data.length;
 396     }
 397
 398
 399   Exit:
 400
 401 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 402     if ( glyph_data_loaded && face->root.internal->incremental_interface )
 403     {
 404       face->root.internal->incremental_interface->funcs->free_glyph_data(
 405         face->root.internal->incremental_interface->object,
 406         &glyph_data );
 407
 408       /* Set the control data to null - it is no longer available if   */
 409       /* loaded incrementally.                                         */
 410       glyph->root.control_data = 0;
 411       glyph->root.control_len  = 0;
 412     }
 413 #endif
 414
 415     if ( must_finish_decoder )
 416       decoder_funcs->done( &decoder );
 417
 418     return error;
 419   }
 420
 421
 422 /* END */