reactos/lib/3rdparty/freetype/src/pfr/pfrobjs.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  pfrobjs.c                                                              */
   4 /*                                                                         */
   5 /*    FreeType PFR object methods (body).                                  */
   6 /*                                                                         */
   7 /*  Copyright 2002-2008, 2010-2011, 2013, 2014 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 "pfrobjs.h"
  20 #include "pfrload.h"
  21 #include "pfrgload.h"
  22 #include "pfrcmap.h"
  23 #include "pfrsbit.h"
  24 #include FT_OUTLINE_H
  25 #include FT_INTERNAL_DEBUG_H
  26 #include FT_INTERNAL_CALC_H
  27 #include FT_TRUETYPE_IDS_H
  28
  29 #include "pfrerror.h"
  30
  31 #undef  FT_COMPONENT
  32 #define FT_COMPONENT  trace_pfr
  33
  34
  35   /*************************************************************************/
  36   /*************************************************************************/
  37   /*****                                                               *****/
  38   /*****                     FACE OBJECT METHODS                       *****/
  39   /*****                                                               *****/
  40   /*************************************************************************/
  41   /*************************************************************************/
  42
  43   FT_LOCAL_DEF( void )
  44   pfr_face_done( FT_Face  pfrface )     /* PFR_Face */
  45   {
  46     PFR_Face   face = (PFR_Face)pfrface;
  47     FT_Memory  memory;
  48
  49
  50     if ( !face )
  51       return;
  52
  53     memory = pfrface->driver->root.memory;
  54
  55     /* we don't want dangling pointers */
  56     pfrface->family_name = NULL;
  57     pfrface->style_name  = NULL;
  58
  59     /* finalize the physical font record */
  60     pfr_phy_font_done( &face->phy_font, FT_FACE_MEMORY( face ) );
  61
  62     /* no need to finalize the logical font or the header */
  63     FT_FREE( pfrface->available_sizes );
  64   }
  65
  66
  67   FT_LOCAL_DEF( FT_Error )
  68   pfr_face_init( FT_Stream      stream,
  69                  FT_Face        pfrface,
  70                  FT_Int         face_index,
  71                  FT_Int         num_params,
  72                  FT_Parameter*  params )
  73   {
  74     PFR_Face  face = (PFR_Face)pfrface;
  75     FT_Error  error;
  76
  77     FT_UNUSED( num_params );
  78     FT_UNUSED( params );
  79
  80
  81     FT_TRACE2(( "PFR driver\n" ));
  82
  83     /* load the header and check it */
  84     error = pfr_header_load( &face->header, stream );
  85     if ( error )
  86       goto Exit;
  87
  88     if ( !pfr_header_check( &face->header ) )
  89     {
  90       FT_TRACE2(( "  not a PFR font\n" ));
  91       error = FT_THROW( Unknown_File_Format );
  92       goto Exit;
  93     }
  94
  95     /* check face index */
  96     {
  97       FT_UInt  num_faces;
  98
  99
 100       error = pfr_log_font_count( stream,
 101                                   face->header.log_dir_offset,
 102                                   &num_faces );
 103       if ( error )
 104         goto Exit;
 105
 106       pfrface->num_faces = num_faces;
 107     }
 108
 109     if ( face_index < 0 )
 110       goto Exit;
 111
 112     if ( face_index >= pfrface->num_faces )
 113     {
 114       FT_ERROR(( "pfr_face_init: invalid face index\n" ));
 115       error = FT_THROW( Invalid_Argument );
 116       goto Exit;
 117     }
 118
 119     /* load the face */
 120     error = pfr_log_font_load(
 121                &face->log_font, stream, face_index,
 122                face->header.log_dir_offset,
 123                FT_BOOL( face->header.phy_font_max_size_high != 0 ) );
 124     if ( error )
 125       goto Exit;
 126
 127     /* now load the physical font descriptor */
 128     error = pfr_phy_font_load( &face->phy_font, stream,
 129                                face->log_font.phys_offset,
 130                                face->log_font.phys_size );
 131     if ( error )
 132       goto Exit;
 133
 134     /* now set up all root face fields */
 135     {
 136       PFR_PhyFont  phy_font = &face->phy_font;
 137
 138
 139       pfrface->face_index = face_index;
 140       pfrface->num_glyphs = phy_font->num_chars + 1;
 141
 142       pfrface->face_flags |= FT_FACE_FLAG_SCALABLE;
 143
 144       /* if all characters point to the same gps_offset 0, we */
 145       /* assume that the font only contains bitmaps           */
 146       {
 147         FT_UInt  nn;
 148
 149
 150         for ( nn = 0; nn < phy_font->num_chars; nn++ )
 151           if ( phy_font->chars[nn].gps_offset != 0 )
 152             break;
 153
 154         if ( nn == phy_font->num_chars )
 155         {
 156           if ( phy_font->num_strikes > 0 )
 157             pfrface->face_flags = 0;        /* not scalable */
 158           else
 159           {
 160             FT_ERROR(( "pfr_face_init: font doesn't contain glyphs\n" ));
 161             error = FT_THROW( Invalid_File_Format );
 162             goto Exit;
 163           }
 164         }
 165       }
 166
 167       if ( (phy_font->flags & PFR_PHY_PROPORTIONAL) == 0 )
 168         pfrface->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
 169
 170       if ( phy_font->flags & PFR_PHY_VERTICAL )
 171         pfrface->face_flags |= FT_FACE_FLAG_VERTICAL;
 172       else
 173         pfrface->face_flags |= FT_FACE_FLAG_HORIZONTAL;
 174
 175       if ( phy_font->num_strikes > 0 )
 176         pfrface->face_flags |= FT_FACE_FLAG_FIXED_SIZES;
 177
 178       if ( phy_font->num_kern_pairs > 0 )
 179         pfrface->face_flags |= FT_FACE_FLAG_KERNING;
 180
 181       /* If no family name was found in the "undocumented" auxiliary
 182        * data, use the font ID instead.  This sucks but is better than
 183        * nothing.
 184        */
 185       pfrface->family_name = phy_font->family_name;
 186       if ( pfrface->family_name == NULL )
 187         pfrface->family_name = phy_font->font_id;
 188
 189       /* note that the style name can be NULL in certain PFR fonts,
 190        * probably meaning "Regular"
 191        */
 192       pfrface->style_name = phy_font->style_name;
 193
 194       pfrface->num_fixed_sizes = 0;
 195       pfrface->available_sizes = 0;
 196
 197       pfrface->bbox         = phy_font->bbox;
 198       pfrface->units_per_EM = (FT_UShort)phy_font->outline_resolution;
 199       pfrface->ascender     = (FT_Short) phy_font->bbox.yMax;
 200       pfrface->descender    = (FT_Short) phy_font->bbox.yMin;
 201
 202       pfrface->height = (FT_Short)( ( pfrface->units_per_EM * 12 ) / 10 );
 203       if ( pfrface->height < pfrface->ascender - pfrface->descender )
 204         pfrface->height = (FT_Short)(pfrface->ascender - pfrface->descender);
 205
 206       if ( phy_font->num_strikes > 0 )
 207       {
 208         FT_UInt          n, count = phy_font->num_strikes;
 209         FT_Bitmap_Size*  size;
 210         PFR_Strike       strike;
 211         FT_Memory        memory = pfrface->stream->memory;
 212
 213
 214         if ( FT_NEW_ARRAY( pfrface->available_sizes, count ) )
 215           goto Exit;
 216
 217         size   = pfrface->available_sizes;
 218         strike = phy_font->strikes;
 219         for ( n = 0; n < count; n++, size++, strike++ )
 220         {
 221           size->height = (FT_UShort)strike->y_ppm;
 222           size->width  = (FT_UShort)strike->x_ppm;
 223           size->size   = strike->y_ppm << 6;
 224           size->x_ppem = strike->x_ppm << 6;
 225           size->y_ppem = strike->y_ppm << 6;
 226         }
 227         pfrface->num_fixed_sizes = count;
 228       }
 229
 230       /* now compute maximum advance width */
 231       if ( ( phy_font->flags & PFR_PHY_PROPORTIONAL ) == 0 )
 232         pfrface->max_advance_width = (FT_Short)phy_font->standard_advance;
 233       else
 234       {
 235         FT_Int    max = 0;
 236         FT_UInt   count = phy_font->num_chars;
 237         PFR_Char  gchar = phy_font->chars;
 238
 239
 240         for ( ; count > 0; count--, gchar++ )
 241         {
 242           if ( max < gchar->advance )
 243             max = gchar->advance;
 244         }
 245
 246         pfrface->max_advance_width = (FT_Short)max;
 247       }
 248
 249       pfrface->max_advance_height = pfrface->height;
 250
 251       pfrface->underline_position  = (FT_Short)( -pfrface->units_per_EM / 10 );
 252       pfrface->underline_thickness = (FT_Short)(  pfrface->units_per_EM / 30 );
 253
 254       /* create charmap */
 255       {
 256         FT_CharMapRec  charmap;
 257
 258
 259         charmap.face        = pfrface;
 260         charmap.platform_id = TT_PLATFORM_MICROSOFT;
 261         charmap.encoding_id = TT_MS_ID_UNICODE_CS;
 262         charmap.encoding    = FT_ENCODING_UNICODE;
 263
 264         error = FT_CMap_New( &pfr_cmap_class_rec, NULL, &charmap, NULL );
 265
 266 #if 0
 267         /* Select default charmap */
 268         if ( pfrface->num_charmaps )
 269           pfrface->charmap = pfrface->charmaps[0];
 270 #endif
 271       }
 272
 273       /* check whether we've loaded any kerning pairs */
 274       if ( phy_font->num_kern_pairs )
 275         pfrface->face_flags |= FT_FACE_FLAG_KERNING;
 276     }
 277
 278   Exit:
 279     return error;
 280   }
 281
 282
 283   /*************************************************************************/
 284   /*************************************************************************/
 285   /*****                                                               *****/
 286   /*****                    SLOT OBJECT METHOD                         *****/
 287   /*****                                                               *****/
 288   /*************************************************************************/
 289   /*************************************************************************/
 290
 291   FT_LOCAL_DEF( FT_Error )
 292   pfr_slot_init( FT_GlyphSlot  pfrslot )        /* PFR_Slot */
 293   {
 294     PFR_Slot        slot   = (PFR_Slot)pfrslot;
 295     FT_GlyphLoader  loader = pfrslot->internal->loader;
 296
 297
 298     pfr_glyph_init( &slot->glyph, loader );
 299
 300     return 0;
 301   }
 302
 303
 304   FT_LOCAL_DEF( void )
 305   pfr_slot_done( FT_GlyphSlot  pfrslot )        /* PFR_Slot */
 306   {
 307     PFR_Slot  slot = (PFR_Slot)pfrslot;
 308
 309
 310     pfr_glyph_done( &slot->glyph );
 311   }
 312
 313
 314   FT_LOCAL_DEF( FT_Error )
 315   pfr_slot_load( FT_GlyphSlot  pfrslot,         /* PFR_Slot */
 316                  FT_Size       pfrsize,         /* PFR_Size */
 317                  FT_UInt       gindex,
 318                  FT_Int32      load_flags )
 319   {
 320     PFR_Slot     slot    = (PFR_Slot)pfrslot;
 321     PFR_Size     size    = (PFR_Size)pfrsize;
 322     FT_Error     error;
 323     PFR_Face     face    = (PFR_Face)pfrslot->face;
 324     PFR_Char     gchar;
 325     FT_Outline*  outline = &pfrslot->outline;
 326     FT_ULong     gps_offset;
 327
 328
 329     FT_TRACE1(( "pfr_slot_load: glyph index %d\n", gindex ));
 330
 331     if ( gindex > 0 )
 332       gindex--;
 333
 334     if ( !face || gindex >= face->phy_font.num_chars )
 335     {
 336       error = FT_THROW( Invalid_Argument );
 337       goto Exit;
 338     }
 339
 340     /* try to load an embedded bitmap */
 341     if ( ( load_flags & ( FT_LOAD_NO_SCALE | FT_LOAD_NO_BITMAP ) ) == 0 )
 342     {
 343       error = pfr_slot_load_bitmap( slot, size, gindex );
 344       if ( error == 0 )
 345         goto Exit;
 346     }
 347
 348     if ( load_flags & FT_LOAD_SBITS_ONLY )
 349     {
 350       error = FT_THROW( Invalid_Argument );
 351       goto Exit;
 352     }
 353
 354     gchar               = face->phy_font.chars + gindex;
 355     pfrslot->format     = FT_GLYPH_FORMAT_OUTLINE;
 356     outline->n_points   = 0;
 357     outline->n_contours = 0;
 358     gps_offset          = face->header.gps_section_offset;
 359
 360     /* load the glyph outline (FT_LOAD_NO_RECURSE isn't supported) */
 361     error = pfr_glyph_load( &slot->glyph, face->root.stream,
 362                             gps_offset, gchar->gps_offset, gchar->gps_size );
 363
 364     if ( !error )
 365     {
 366       FT_BBox            cbox;
 367       FT_Glyph_Metrics*  metrics = &pfrslot->metrics;
 368       FT_Pos             advance;
 369       FT_Int             em_metrics, em_outline;
 370       FT_Bool            scaling;
 371
 372
 373       scaling = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 );
 374
 375       /* copy outline data */
 376       *outline = slot->glyph.loader->base.outline;
 377
 378       outline->flags &= ~FT_OUTLINE_OWNER;
 379       outline->flags |= FT_OUTLINE_REVERSE_FILL;
 380
 381       if ( size && pfrsize->metrics.y_ppem < 24 )
 382         outline->flags |= FT_OUTLINE_HIGH_PRECISION;
 383
 384       /* compute the advance vector */
 385       metrics->horiAdvance = 0;
 386       metrics->vertAdvance = 0;
 387
 388       advance    = gchar->advance;
 389       em_metrics = face->phy_font.metrics_resolution;
 390       em_outline = face->phy_font.outline_resolution;
 391
 392       if ( em_metrics != em_outline )
 393         advance = FT_MulDiv( advance, em_outline, em_metrics );
 394
 395       if ( face->phy_font.flags & PFR_PHY_VERTICAL )
 396         metrics->vertAdvance = advance;
 397       else
 398         metrics->horiAdvance = advance;
 399
 400       pfrslot->linearHoriAdvance = metrics->horiAdvance;
 401       pfrslot->linearVertAdvance = metrics->vertAdvance;
 402
 403       /* make-up vertical metrics(?) */
 404       metrics->vertBearingX = 0;
 405       metrics->vertBearingY = 0;
 406
 407 #if 0 /* some fonts seem to be broken here! */
 408
 409       /* Apply the font matrix, if any.                 */
 410       /* TODO: Test existing fonts with unusual matrix  */
 411       /* whether we have to adjust Units per EM.        */
 412       {
 413         FT_Matrix font_matrix;
 414
 415
 416         font_matrix.xx = face->log_font.matrix[0] << 8;
 417         font_matrix.yx = face->log_font.matrix[1] << 8;
 418         font_matrix.xy = face->log_font.matrix[2] << 8;
 419         font_matrix.yy = face->log_font.matrix[3] << 8;
 420
 421         FT_Outline_Transform( outline, &font_matrix );
 422       }
 423 #endif
 424
 425       /* scale when needed */
 426       if ( scaling )
 427       {
 428         FT_Int      n;
 429         FT_Fixed    x_scale = pfrsize->metrics.x_scale;
 430         FT_Fixed    y_scale = pfrsize->metrics.y_scale;
 431         FT_Vector*  vec     = outline->points;
 432
 433
 434         /* scale outline points */
 435         for ( n = 0; n < outline->n_points; n++, vec++ )
 436         {
 437           vec->x = FT_MulFix( vec->x, x_scale );
 438           vec->y = FT_MulFix( vec->y, y_scale );
 439         }
 440
 441         /* scale the advance */
 442         metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
 443         metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
 444       }
 445
 446       /* compute the rest of the metrics */
 447       FT_Outline_Get_CBox( outline, &cbox );
 448
 449       metrics->width        = cbox.xMax - cbox.xMin;
 450       metrics->height       = cbox.yMax - cbox.yMin;
 451       metrics->horiBearingX = cbox.xMin;
 452       metrics->horiBearingY = cbox.yMax - metrics->height;
 453     }
 454
 455   Exit:
 456     return error;
 457   }
 458
 459
 460   /*************************************************************************/
 461   /*************************************************************************/
 462   /*****                                                               *****/
 463   /*****                      KERNING METHOD                           *****/
 464   /*****                                                               *****/
 465   /*************************************************************************/
 466   /*************************************************************************/
 467
 468   FT_LOCAL_DEF( FT_Error )
 469   pfr_face_get_kerning( FT_Face     pfrface,        /* PFR_Face */
 470                         FT_UInt     glyph1,
 471                         FT_UInt     glyph2,
 472                         FT_Vector*  kerning )
 473   {
 474     PFR_Face     face     = (PFR_Face)pfrface;
 475     FT_Error     error    = FT_Err_Ok;
 476     PFR_PhyFont  phy_font = &face->phy_font;
 477     FT_UInt32    code1, code2, pair;
 478
 479
 480     kerning->x = 0;
 481     kerning->y = 0;
 482
 483     if ( glyph1 > 0 )
 484       glyph1--;
 485
 486     if ( glyph2 > 0 )
 487       glyph2--;
 488
 489     /* convert glyph indices to character codes */
 490     if ( glyph1 > phy_font->num_chars ||
 491          glyph2 > phy_font->num_chars )
 492       goto Exit;
 493
 494     code1 = phy_font->chars[glyph1].char_code;
 495     code2 = phy_font->chars[glyph2].char_code;
 496     pair  = PFR_KERN_INDEX( code1, code2 );
 497
 498     /* now search the list of kerning items */
 499     {
 500       PFR_KernItem  item   = phy_font->kern_items;
 501       FT_Stream     stream = pfrface->stream;
 502
 503
 504       for ( ; item; item = item->next )
 505       {
 506         if ( pair >= item->pair1 && pair <= item->pair2 )
 507           goto FoundPair;
 508       }
 509       goto Exit;
 510
 511     FoundPair: /* we found an item, now parse it and find the value if any */
 512       if ( FT_STREAM_SEEK( item->offset )                       ||
 513            FT_FRAME_ENTER( item->pair_count * item->pair_size ) )
 514         goto Exit;
 515
 516       {
 517         FT_UInt    count       = item->pair_count;
 518         FT_UInt    size        = item->pair_size;
 519         FT_UInt    power       = 1 << FT_MSB( count );
 520         FT_UInt    probe       = power * size;
 521         FT_UInt    extra       = count - power;
 522         FT_Byte*   base        = stream->cursor;
 523         FT_Bool    twobytes    = FT_BOOL( item->flags & 1 );
 524         FT_Bool    twobyte_adj = FT_BOOL( item->flags & 2 );
 525         FT_Byte*   p;
 526         FT_UInt32  cpair;
 527
 528
 529         if ( extra > 0 )
 530         {
 531           p = base + extra * size;
 532
 533           if ( twobytes )
 534             cpair = FT_NEXT_ULONG( p );
 535           else
 536             cpair = PFR_NEXT_KPAIR( p );
 537
 538           if ( cpair == pair )
 539             goto Found;
 540
 541           if ( cpair < pair )
 542           {
 543             if ( twobyte_adj )
 544               p += 2;
 545             else
 546               p++;
 547             base = p;
 548           }
 549         }
 550
 551         while ( probe > size )
 552         {
 553           probe >>= 1;
 554           p       = base + probe;
 555
 556           if ( twobytes )
 557             cpair = FT_NEXT_ULONG( p );
 558           else
 559             cpair = PFR_NEXT_KPAIR( p );
 560
 561           if ( cpair == pair )
 562             goto Found;
 563
 564           if ( cpair < pair )
 565             base += probe;
 566         }
 567
 568         p = base;
 569
 570         if ( twobytes )
 571           cpair = FT_NEXT_ULONG( p );
 572         else
 573           cpair = PFR_NEXT_KPAIR( p );
 574
 575         if ( cpair == pair )
 576         {
 577           FT_Int  value;
 578
 579
 580         Found:
 581           if ( twobyte_adj )
 582             value = FT_PEEK_SHORT( p );
 583           else
 584             value = p[0];
 585
 586           kerning->x = item->base_adj + value;
 587         }
 588       }
 589
 590       FT_FRAME_EXIT();
 591     }
 592
 593   Exit:
 594     return error;
 595   }
 596
 597 /* END */