src/type1/t1gload.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  t1gload.c                                                              */
   4 /*                                                                         */
   5 /*    Type 1 Glyph Loader (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 "t1gload.h"
  21 #include FT_INTERNAL_CALC_H
  22 #include FT_INTERNAL_DEBUG_H
  23 #include FT_INTERNAL_STREAM_H
  24 #include FT_OUTLINE_H
  25 #include FT_INTERNAL_POSTSCRIPT_AUX_H
  26
  27 #include "t1errors.h"
  28
  29
  30   /*************************************************************************/
  31   /*                                                                       */
  32   /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  33   /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  34   /* messages during execution.                                            */
  35   /*                                                                       */
  36 #undef  FT_COMPONENT
  37 #define FT_COMPONENT  trace_t1gload
  38
  39
  40   /*************************************************************************/
  41   /*************************************************************************/
  42   /*************************************************************************/
  43   /**********                                                      *********/
  44   /**********            COMPUTE THE MAXIMUM ADVANCE WIDTH         *********/
  45   /**********                                                      *********/
  46   /**********    The following code is in charge of computing      *********/
  47   /**********    the maximum advance width of the font.  It        *********/
  48   /**********    quickly processes each glyph charstring to        *********/
  49   /**********    extract the value from either a `sbw' or `seac'   *********/
  50   /**********    operator.                                         *********/
  51   /**********                                                      *********/
  52   /*************************************************************************/
  53   /*************************************************************************/
  54   /*************************************************************************/
  55
  56
  57   static FT_Error
  58   T1_Parse_Glyph_And_Get_Char_String( T1_Decoder  decoder,
  59                                       FT_UInt     glyph_index,
  60                                       FT_Data*    char_string )
  61   {
  62     T1_Face   face  = (T1_Face)decoder->builder.face;
  63     T1_Font   type1 = &face->type1;
  64     FT_Error  error = FT_Err_Ok;
  65
  66 #ifdef FT_CONFIG_OPTION_INCREMENTAL
  67     FT_Incremental_InterfaceRec *inc =
  68                       face->root.internal->incremental_interface;
  69 #endif
  70
  71
  72     decoder->font_matrix = type1->font_matrix;
  73     decoder->font_offset = type1->font_offset;
  74
  75 #ifdef FT_CONFIG_OPTION_INCREMENTAL
  76
  77     /* For incremental fonts get the character data using the */
  78     /* callback function.                                     */
  79     if ( inc )
  80       error = inc->funcs->get_glyph_data( inc->object,
  81                                           glyph_index, char_string );
  82     else
  83
  84 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
  85
  86     /* For ordinary fonts get the character data stored in the face record. */
  87     {
  88       char_string->pointer = type1->charstrings[glyph_index];
  89       char_string->length  = (FT_Int)type1->charstrings_len[glyph_index];
  90     }
  91
  92     if ( !error )
  93       error = decoder->funcs.parse_charstrings(
  94                 decoder, (FT_Byte*)char_string->pointer,
  95                 (FT_UInt)char_string->length );
  96
  97 #ifdef FT_CONFIG_OPTION_INCREMENTAL
  98
  99     /* Incremental fonts can optionally override the metrics. */
 100     if ( !error && inc && inc->funcs->get_glyph_metrics )
 101     {
 102       FT_Incremental_MetricsRec  metrics;
 103
 104
 105       metrics.bearing_x = FIXED_TO_INT( decoder->builder.left_bearing.x );
 106       metrics.bearing_y = 0;
 107       metrics.advance   = FIXED_TO_INT( decoder->builder.advance.x );
 108       metrics.advance_v = FIXED_TO_INT( decoder->builder.advance.y );
 109
 110       error = inc->funcs->get_glyph_metrics( inc->object,
 111                                              glyph_index, FALSE, &metrics );
 112
 113       decoder->builder.left_bearing.x = INT_TO_FIXED( metrics.bearing_x );
 114       decoder->builder.advance.x      = INT_TO_FIXED( metrics.advance );
 115       decoder->builder.advance.y      = INT_TO_FIXED( metrics.advance_v );
 116     }
 117
 118 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
 119
 120     return error;
 121   }
 122
 123
 124   FT_CALLBACK_DEF( FT_Error )
 125   T1_Parse_Glyph( T1_Decoder  decoder,
 126                   FT_UInt     glyph_index )
 127   {
 128     FT_Data   glyph_data;
 129     FT_Error  error = T1_Parse_Glyph_And_Get_Char_String(
 130                         decoder, glyph_index, &glyph_data );
 131
 132
 133 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 134
 135     if ( !error )
 136     {
 137       T1_Face  face = (T1_Face)decoder->builder.face;
 138
 139
 140       if ( face->root.internal->incremental_interface )
 141         face->root.internal->incremental_interface->funcs->free_glyph_data(
 142           face->root.internal->incremental_interface->object,
 143           &glyph_data );
 144     }
 145
 146 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
 147
 148     return error;
 149   }
 150
 151
 152   FT_LOCAL_DEF( FT_Error )
 153   T1_Compute_Max_Advance( T1_Face  face,
 154                           FT_Pos*  max_advance )
 155   {
 156     FT_Error       error;
 157     T1_DecoderRec  decoder;
 158     FT_Int         glyph_index;
 159     T1_Font        type1 = &face->type1;
 160     PSAux_Service  psaux = (PSAux_Service)face->psaux;
 161
 162
 163     FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) );
 164
 165     *max_advance = 0;
 166
 167     /* initialize load decoder */
 168     error = psaux->t1_decoder_funcs->init( &decoder,
 169                                            (FT_Face)face,
 170                                            0, /* size       */
 171                                            0, /* glyph slot */
 172                                            (FT_Byte**)type1->glyph_names,
 173                                            face->blend,
 174                                            0,
 175                                            FT_RENDER_MODE_NORMAL,
 176                                            T1_Parse_Glyph );
 177     if ( error )
 178       return error;
 179
 180     decoder.builder.metrics_only = 1;
 181     decoder.builder.load_points  = 0;
 182
 183     decoder.num_subrs     = type1->num_subrs;
 184     decoder.subrs         = type1->subrs;
 185     decoder.subrs_len     = type1->subrs_len;
 186     decoder.subrs_hash    = type1->subrs_hash;
 187
 188     decoder.buildchar     = face->buildchar;
 189     decoder.len_buildchar = face->len_buildchar;
 190
 191     *max_advance = 0;
 192
 193     /* for each glyph, parse the glyph charstring and extract */
 194     /* the advance width                                      */
 195     for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ )
 196     {
 197       /* now get load the unscaled outline */
 198       (void)T1_Parse_Glyph( &decoder, (FT_UInt)glyph_index );
 199       if ( glyph_index == 0 || decoder.builder.advance.x > *max_advance )
 200         *max_advance = decoder.builder.advance.x;
 201
 202       /* ignore the error if one occurred - skip to next glyph */
 203     }
 204
 205     psaux->t1_decoder_funcs->done( &decoder );
 206
 207     return FT_Err_Ok;
 208   }
 209
 210
 211   FT_LOCAL_DEF( FT_Error )
 212   T1_Get_Advances( FT_Face    t1face,        /* T1_Face */
 213                    FT_UInt    first,
 214                    FT_UInt    count,
 215                    FT_Int32   load_flags,
 216                    FT_Fixed*  advances )
 217   {
 218     T1_Face        face  = (T1_Face)t1face;
 219     T1_DecoderRec  decoder;
 220     T1_Font        type1 = &face->type1;
 221     PSAux_Service  psaux = (PSAux_Service)face->psaux;
 222     FT_UInt        nn;
 223     FT_Error       error;
 224
 225
 226     if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
 227     {
 228       for ( nn = 0; nn < count; nn++ )
 229         advances[nn] = 0;
 230
 231       return FT_Err_Ok;
 232     }
 233
 234     error = psaux->t1_decoder_funcs->init( &decoder,
 235                                            (FT_Face)face,
 236                                            0, /* size       */
 237                                            0, /* glyph slot */
 238                                            (FT_Byte**)type1->glyph_names,
 239                                            face->blend,
 240                                            0,
 241                                            FT_RENDER_MODE_NORMAL,
 242                                            T1_Parse_Glyph );
 243     if ( error )
 244       return error;
 245
 246     decoder.builder.metrics_only = 1;
 247     decoder.builder.load_points  = 0;
 248
 249     decoder.num_subrs  = type1->num_subrs;
 250     decoder.subrs      = type1->subrs;
 251     decoder.subrs_len  = type1->subrs_len;
 252     decoder.subrs_hash = type1->subrs_hash;
 253
 254     decoder.buildchar     = face->buildchar;
 255     decoder.len_buildchar = face->len_buildchar;
 256
 257     for ( nn = 0; nn < count; nn++ )
 258     {
 259       error = T1_Parse_Glyph( &decoder, first + nn );
 260       if ( !error )
 261         advances[nn] = FIXED_TO_INT( decoder.builder.advance.x );
 262       else
 263         advances[nn] = 0;
 264     }
 265
 266     return FT_Err_Ok;
 267   }
 268
 269
 270   FT_LOCAL_DEF( FT_Error )
 271   T1_Load_Glyph( FT_GlyphSlot  t1glyph,          /* T1_GlyphSlot */
 272                  FT_Size       t1size,           /* T1_Size      */
 273                  FT_UInt       glyph_index,
 274                  FT_Int32      load_flags )
 275   {
 276     T1_GlyphSlot            glyph = (T1_GlyphSlot)t1glyph;
 277     FT_Error                error;
 278     T1_DecoderRec           decoder;
 279     T1_Face                 face = (T1_Face)t1glyph->face;
 280     FT_Bool                 hinting;
 281     T1_Font                 type1         = &face->type1;
 282     PSAux_Service           psaux         = (PSAux_Service)face->psaux;
 283     const T1_Decoder_Funcs  decoder_funcs = psaux->t1_decoder_funcs;
 284
 285     FT_Matrix               font_matrix;
 286     FT_Vector               font_offset;
 287     FT_Data                 glyph_data;
 288     FT_Bool                 must_finish_decoder = FALSE;
 289 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 290     FT_Bool                 glyph_data_loaded = 0;
 291 #endif
 292
 293
 294 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 295     if ( glyph_index >= (FT_UInt)face->root.num_glyphs &&
 296          !face->root.internal->incremental_interface   )
 297 #else
 298     if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
 299 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
 300     {
 301       error = FT_THROW( Invalid_Argument );
 302       goto Exit;
 303     }
 304
 305     FT_TRACE1(( "T1_Load_Glyph: glyph index %d\n", glyph_index ));
 306
 307     FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) );
 308
 309     if ( load_flags & FT_LOAD_NO_RECURSE )
 310       load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
 311
 312     if ( t1size )
 313     {
 314       glyph->x_scale = t1size->metrics.x_scale;
 315       glyph->y_scale = t1size->metrics.y_scale;
 316     }
 317     else
 318     {
 319       glyph->x_scale = 0x10000L;
 320       glyph->y_scale = 0x10000L;
 321     }
 322
 323     t1glyph->outline.n_points   = 0;
 324     t1glyph->outline.n_contours = 0;
 325
 326     hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
 327                        ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
 328
 329     t1glyph->format = FT_GLYPH_FORMAT_OUTLINE;
 330
 331     error = decoder_funcs->init( &decoder,
 332                                  t1glyph->face,
 333                                  t1size,
 334                                  t1glyph,
 335                                  (FT_Byte**)type1->glyph_names,
 336                                  face->blend,
 337                                  FT_BOOL( hinting ),
 338                                  FT_LOAD_TARGET_MODE( load_flags ),
 339                                  T1_Parse_Glyph );
 340     if ( error )
 341       goto Exit;
 342
 343     must_finish_decoder = TRUE;
 344
 345     decoder.builder.no_recurse = FT_BOOL(
 346                                    ( load_flags & FT_LOAD_NO_RECURSE ) != 0 );
 347
 348     decoder.num_subrs     = type1->num_subrs;
 349     decoder.subrs         = type1->subrs;
 350     decoder.subrs_len     = type1->subrs_len;
 351     decoder.subrs_hash    = type1->subrs_hash;
 352
 353     decoder.buildchar     = face->buildchar;
 354     decoder.len_buildchar = face->len_buildchar;
 355
 356     /* now load the unscaled outline */
 357     error = T1_Parse_Glyph_And_Get_Char_String( &decoder, glyph_index,
 358                                                 &glyph_data );
 359     if ( error )
 360       goto Exit;
 361 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 362     glyph_data_loaded = 1;
 363 #endif
 364
 365     font_matrix = decoder.font_matrix;
 366     font_offset = decoder.font_offset;
 367
 368     /* save new glyph tables */
 369     decoder_funcs->done( &decoder );
 370
 371     must_finish_decoder = FALSE;
 372
 373     /* now, set the metrics -- this is rather simple, as   */
 374     /* the left side bearing is the xMin, and the top side */
 375     /* bearing the yMax                                    */
 376     if ( !error )
 377     {
 378       t1glyph->outline.flags &= FT_OUTLINE_OWNER;
 379       t1glyph->outline.flags |= FT_OUTLINE_REVERSE_FILL;
 380
 381       /* for composite glyphs, return only left side bearing and */
 382       /* advance width                                           */
 383       if ( load_flags & FT_LOAD_NO_RECURSE )
 384       {
 385         FT_Slot_Internal  internal = t1glyph->internal;
 386
 387
 388         t1glyph->metrics.horiBearingX =
 389           FIXED_TO_INT( decoder.builder.left_bearing.x );
 390         t1glyph->metrics.horiAdvance  =
 391           FIXED_TO_INT( decoder.builder.advance.x );
 392
 393         internal->glyph_matrix      = font_matrix;
 394         internal->glyph_delta       = font_offset;
 395         internal->glyph_transformed = 1;
 396       }
 397       else
 398       {
 399         FT_BBox            cbox;
 400         FT_Glyph_Metrics*  metrics = &t1glyph->metrics;
 401
 402
 403         /* copy the _unscaled_ advance width */
 404         metrics->horiAdvance =
 405           FIXED_TO_INT( decoder.builder.advance.x );
 406         t1glyph->linearHoriAdvance =
 407           FIXED_TO_INT( decoder.builder.advance.x );
 408         t1glyph->internal->glyph_transformed = 0;
 409
 410         if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
 411         {
 412           /* make up vertical ones */
 413           metrics->vertAdvance = ( face->type1.font_bbox.yMax -
 414                                    face->type1.font_bbox.yMin ) >> 16;
 415           t1glyph->linearVertAdvance = metrics->vertAdvance;
 416         }
 417         else
 418         {
 419           metrics->vertAdvance =
 420             FIXED_TO_INT( decoder.builder.advance.y );
 421           t1glyph->linearVertAdvance =
 422             FIXED_TO_INT( decoder.builder.advance.y );
 423         }
 424
 425         t1glyph->format = FT_GLYPH_FORMAT_OUTLINE;
 426
 427         if ( t1size && t1size->metrics.y_ppem < 24 )
 428           t1glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
 429
 430 #if 1
 431         /* apply the font matrix, if any */
 432         if ( font_matrix.xx != 0x10000L || font_matrix.yy != 0x10000L ||
 433              font_matrix.xy != 0        || font_matrix.yx != 0        )
 434         {
 435           FT_Outline_Transform( &t1glyph->outline, &font_matrix );
 436
 437           metrics->horiAdvance = FT_MulFix( metrics->horiAdvance,
 438                                             font_matrix.xx );
 439           metrics->vertAdvance = FT_MulFix( metrics->vertAdvance,
 440                                             font_matrix.yy );
 441         }
 442
 443         if ( font_offset.x || font_offset.y )
 444         {
 445           FT_Outline_Translate( &t1glyph->outline,
 446                                 font_offset.x,
 447                                 font_offset.y );
 448
 449           metrics->horiAdvance += font_offset.x;
 450           metrics->vertAdvance += font_offset.y;
 451         }
 452 #endif
 453
 454         if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
 455         {
 456           /* scale the outline and the metrics */
 457           FT_Int       n;
 458           FT_Outline*  cur = decoder.builder.base;
 459           FT_Vector*   vec = cur->points;
 460           FT_Fixed     x_scale = glyph->x_scale;
 461           FT_Fixed     y_scale = glyph->y_scale;
 462
 463
 464           /* First of all, scale the points, if we are not hinting */
 465           if ( !hinting || ! decoder.builder.hints_funcs )
 466             for ( n = cur->n_points; n > 0; n--, vec++ )
 467             {
 468               vec->x = FT_MulFix( vec->x, x_scale );
 469               vec->y = FT_MulFix( vec->y, y_scale );
 470             }
 471
 472           /* Then scale the metrics */
 473           metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
 474           metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
 475         }
 476
 477         /* compute the other metrics */
 478         FT_Outline_Get_CBox( &t1glyph->outline, &cbox );
 479
 480         metrics->width  = cbox.xMax - cbox.xMin;
 481         metrics->height = cbox.yMax - cbox.yMin;
 482
 483         metrics->horiBearingX = cbox.xMin;
 484         metrics->horiBearingY = cbox.yMax;
 485
 486         if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
 487         {
 488           /* make up vertical ones */
 489           ft_synthesize_vertical_metrics( metrics,
 490                                           metrics->vertAdvance );
 491         }
 492       }
 493
 494       /* Set control data to the glyph charstrings.  Note that this is */
 495       /* _not_ zero-terminated.                                        */
 496       t1glyph->control_data = (FT_Byte*)glyph_data.pointer;
 497       t1glyph->control_len  = glyph_data.length;
 498     }
 499
 500
 501   Exit:
 502
 503 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 504     if ( glyph_data_loaded && face->root.internal->incremental_interface )
 505     {
 506       face->root.internal->incremental_interface->funcs->free_glyph_data(
 507         face->root.internal->incremental_interface->object,
 508         &glyph_data );
 509
 510       /* Set the control data to null - it is no longer available if   */
 511       /* loaded incrementally.                                         */
 512       t1glyph->control_data = NULL;
 513       t1glyph->control_len  = 0;
 514     }
 515 #endif
 516
 517     if ( must_finish_decoder )
 518       decoder_funcs->done( &decoder );
 519
 520     return error;
 521   }
 522
 523
 524 /* END */