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, 2008, 2009, 2010 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   FT_LOCAL_DEF( 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 = T1_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                 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
 187     decoder.buildchar     = face->buildchar;
 188     decoder.len_buildchar = face->len_buildchar;
 189
 190     *max_advance = 0;
 191
 192     /* for each glyph, parse the glyph charstring and extract */
 193     /* the advance width                                      */
 194     for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ )
 195     {
 196       /* now get load the unscaled outline */
 197       error = T1_Parse_Glyph( &decoder, glyph_index );
 198       if ( glyph_index == 0 || decoder.builder.advance.x > *max_advance )
 199         *max_advance = decoder.builder.advance.x;
 200
 201       /* ignore the error if one occurred - skip to next glyph */
 202     }
 203
 204     psaux->t1_decoder_funcs->done( &decoder );
 205
 206     return T1_Err_Ok;
 207   }
 208
 209
 210   FT_LOCAL_DEF( FT_Error )
 211   T1_Get_Advances( T1_Face    face,
 212                    FT_UInt    first,
 213                    FT_UInt    count,
 214                    FT_ULong   load_flags,
 215                    FT_Fixed*  advances )
 216   {
 217     T1_DecoderRec  decoder;
 218     T1_Font        type1 = &face->type1;
 219     PSAux_Service  psaux = (PSAux_Service)face->psaux;
 220     FT_UInt        nn;
 221     FT_Error       error;
 222
 223
 224     if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
 225     {
 226       for ( nn = 0; nn < count; nn++ )
 227         advances[nn] = 0;
 228
 229       return T1_Err_Ok;
 230     }
 231
 232     error = psaux->t1_decoder_funcs->init( &decoder,
 233                                            (FT_Face)face,
 234                                            0, /* size       */
 235                                            0, /* glyph slot */
 236                                            (FT_Byte**)type1->glyph_names,
 237                                            face->blend,
 238                                            0,
 239                                            FT_RENDER_MODE_NORMAL,
 240                                            T1_Parse_Glyph );
 241     if ( error )
 242       return error;
 243
 244     decoder.builder.metrics_only = 1;
 245     decoder.builder.load_points  = 0;
 246
 247     decoder.num_subrs = type1->num_subrs;
 248     decoder.subrs     = type1->subrs;
 249     decoder.subrs_len = type1->subrs_len;
 250
 251     decoder.buildchar     = face->buildchar;
 252     decoder.len_buildchar = face->len_buildchar;
 253
 254     for ( nn = 0; nn < count; nn++ )
 255     {
 256       error = T1_Parse_Glyph( &decoder, first + nn );
 257       if ( !error )
 258         advances[nn] = FIXED_TO_INT( decoder.builder.advance.x );
 259       else
 260         advances[nn] = 0;
 261     }
 262
 263     return T1_Err_Ok;
 264   }
 265
 266
 267   FT_LOCAL_DEF( FT_Error )
 268   T1_Load_Glyph( T1_GlyphSlot  glyph,
 269                  T1_Size       size,
 270                  FT_UInt       glyph_index,
 271                  FT_Int32      load_flags )
 272   {
 273     FT_Error                error;
 274     T1_DecoderRec           decoder;
 275     T1_Face                 face = (T1_Face)glyph->root.face;
 276     FT_Bool                 hinting;
 277     T1_Font                 type1         = &face->type1;
 278     PSAux_Service           psaux         = (PSAux_Service)face->psaux;
 279     const T1_Decoder_Funcs  decoder_funcs = psaux->t1_decoder_funcs;
 280
 281     FT_Matrix               font_matrix;
 282     FT_Vector               font_offset;
 283     FT_Data                 glyph_data;
 284     FT_Bool                 must_finish_decoder = FALSE;
 285 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 286     FT_Bool                 glyph_data_loaded = 0;
 287 #endif
 288
 289
 290 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 291     if ( glyph_index >= (FT_UInt)face->root.num_glyphs &&
 292          !face->root.internal->incremental_interface   )
 293 #else
 294     if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
 295 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
 296     {
 297       error = T1_Err_Invalid_Argument;
 298       goto Exit;
 299     }
 300
 301     FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) );
 302
 303     if ( load_flags & FT_LOAD_NO_RECURSE )
 304       load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
 305
 306     if ( size )
 307     {
 308       glyph->x_scale = size->root.metrics.x_scale;
 309       glyph->y_scale = size->root.metrics.y_scale;
 310     }
 311     else
 312     {
 313       glyph->x_scale = 0x10000L;
 314       glyph->y_scale = 0x10000L;
 315     }
 316
 317     glyph->root.outline.n_points   = 0;
 318     glyph->root.outline.n_contours = 0;
 319
 320     hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
 321                        ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
 322
 323     glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
 324
 325     error = decoder_funcs->init( &decoder,
 326                                  (FT_Face)face,
 327                                  (FT_Size)size,
 328                                  (FT_GlyphSlot)glyph,
 329                                  (FT_Byte**)type1->glyph_names,
 330                                  face->blend,
 331                                  FT_BOOL( hinting ),
 332                                  FT_LOAD_TARGET_MODE( load_flags ),
 333                                  T1_Parse_Glyph );
 334     if ( error )
 335       goto Exit;
 336
 337     must_finish_decoder = TRUE;
 338
 339     decoder.builder.no_recurse = FT_BOOL(
 340                                    ( load_flags & FT_LOAD_NO_RECURSE ) != 0 );
 341
 342     decoder.num_subrs     = type1->num_subrs;
 343     decoder.subrs         = type1->subrs;
 344     decoder.subrs_len     = type1->subrs_len;
 345
 346     decoder.buildchar     = face->buildchar;
 347     decoder.len_buildchar = face->len_buildchar;
 348
 349     /* now load the unscaled outline */
 350     error = T1_Parse_Glyph_And_Get_Char_String( &decoder, glyph_index,
 351                                                 &glyph_data );
 352     if ( error )
 353       goto Exit;
 354 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 355     glyph_data_loaded = 1;
 356 #endif
 357
 358     font_matrix = decoder.font_matrix;
 359     font_offset = decoder.font_offset;
 360
 361     /* save new glyph tables */
 362     decoder_funcs->done( &decoder );
 363
 364     must_finish_decoder = FALSE;
 365
 366     /* now, set the metrics -- this is rather simple, as   */
 367     /* the left side bearing is the xMin, and the top side */
 368     /* bearing the yMax                                    */
 369     if ( !error )
 370     {
 371       glyph->root.outline.flags &= FT_OUTLINE_OWNER;
 372       glyph->root.outline.flags |= FT_OUTLINE_REVERSE_FILL;
 373
 374       /* for composite glyphs, return only left side bearing and */
 375       /* advance width                                           */
 376       if ( load_flags & FT_LOAD_NO_RECURSE )
 377       {
 378         FT_Slot_Internal  internal = glyph->root.internal;
 379
 380
 381         glyph->root.metrics.horiBearingX =
 382           FIXED_TO_INT( decoder.builder.left_bearing.x );
 383         glyph->root.metrics.horiAdvance  =
 384           FIXED_TO_INT( decoder.builder.advance.x );
 385
 386         internal->glyph_matrix      = font_matrix;
 387         internal->glyph_delta       = font_offset;
 388         internal->glyph_transformed = 1;
 389       }
 390       else
 391       {
 392         FT_BBox            cbox;
 393         FT_Glyph_Metrics*  metrics = &glyph->root.metrics;
 394         FT_Vector          advance;
 395
 396
 397         /* copy the _unscaled_ advance width */
 398         metrics->horiAdvance =
 399           FIXED_TO_INT( decoder.builder.advance.x );
 400         glyph->root.linearHoriAdvance =
 401           FIXED_TO_INT( decoder.builder.advance.x );
 402         glyph->root.internal->glyph_transformed = 0;
 403
 404         if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
 405         {
 406           /* make up vertical ones */
 407           metrics->vertAdvance = ( face->type1.font_bbox.yMax -
 408                                    face->type1.font_bbox.yMin ) >> 16;
 409           glyph->root.linearVertAdvance = metrics->vertAdvance;
 410         }
 411         else
 412         {
 413           metrics->vertAdvance =
 414             FIXED_TO_INT( decoder.builder.advance.y );
 415           glyph->root.linearVertAdvance =
 416             FIXED_TO_INT( decoder.builder.advance.y );
 417         }
 418
 419         glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
 420
 421         if ( size && size->root.metrics.y_ppem < 24 )
 422           glyph->root.outline.flags |= FT_OUTLINE_HIGH_PRECISION;
 423
 424 #if 1
 425         /* apply the font matrix, if any */
 426         if ( font_matrix.xx != 0x10000L || font_matrix.yy != font_matrix.xx ||
 427              font_matrix.xy != 0        || font_matrix.yx != 0              )
 428           FT_Outline_Transform( &glyph->root.outline, &font_matrix );
 429
 430         if ( font_offset.x || font_offset.y )
 431           FT_Outline_Translate( &glyph->root.outline,
 432                                 font_offset.x,
 433                                 font_offset.y );
 434
 435         advance.x = metrics->horiAdvance;
 436         advance.y = 0;
 437         FT_Vector_Transform( &advance, &font_matrix );
 438         metrics->horiAdvance = advance.x + font_offset.x;
 439         advance.x = 0;
 440         advance.y = metrics->vertAdvance;
 441         FT_Vector_Transform( &advance, &font_matrix );
 442         metrics->vertAdvance = advance.y + font_offset.y;
 443 #endif
 444
 445         if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
 446         {
 447           /* scale the outline and the metrics */
 448           FT_Int       n;
 449           FT_Outline*  cur = decoder.builder.base;
 450           FT_Vector*   vec = cur->points;
 451           FT_Fixed     x_scale = glyph->x_scale;
 452           FT_Fixed     y_scale = glyph->y_scale;
 453
 454
 455           /* First of all, scale the points, if we are not hinting */
 456           if ( !hinting || ! decoder.builder.hints_funcs )
 457             for ( n = cur->n_points; n > 0; n--, vec++ )
 458             {
 459               vec->x = FT_MulFix( vec->x, x_scale );
 460               vec->y = FT_MulFix( vec->y, y_scale );
 461             }
 462
 463           /* Then scale the metrics */
 464           metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
 465           metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
 466         }
 467
 468         /* compute the other metrics */
 469         FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
 470
 471         metrics->width  = cbox.xMax - cbox.xMin;
 472         metrics->height = cbox.yMax - cbox.yMin;
 473
 474         metrics->horiBearingX = cbox.xMin;
 475         metrics->horiBearingY = cbox.yMax;
 476
 477         if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
 478         {
 479           /* make up vertical ones */
 480           ft_synthesize_vertical_metrics( metrics,
 481                                           metrics->vertAdvance );
 482         }
 483       }
 484
 485       /* Set control data to the glyph charstrings.  Note that this is */
 486       /* _not_ zero-terminated.                                        */
 487       glyph->root.control_data = (FT_Byte*)glyph_data.pointer;
 488       glyph->root.control_len  = glyph_data.length;
 489     }
 490
 491
 492   Exit:
 493
 494 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 495     if ( glyph_data_loaded && face->root.internal->incremental_interface )
 496     {
 497       face->root.internal->incremental_interface->funcs->free_glyph_data(
 498         face->root.internal->incremental_interface->object,
 499         &glyph_data );
 500
 501       /* Set the control data to null - it is no longer available if   */
 502       /* loaded incrementally.                                         */
 503       glyph->root.control_data = 0;
 504       glyph->root.control_len  = 0;
 505     }
 506 #endif
 507
 508     if ( must_finish_decoder )
 509       decoder_funcs->done( &decoder );
 510
 511     return error;
 512   }
 513
 514
 515 /* END */