1 /***************************************************************************/ 2 /* */ 3 /* ftglyph.c */ 4 /* */ 5 /* FreeType convenience functions to handle glyphs (body). */ 6 /* */ 7 /* Copyright 1996-2018 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 /* */ 20 /* This file contains the definition of several convenience functions */ 21 /* that can be used by client applications to easily retrieve glyph */ 22 /* bitmaps and outlines from a given face. */ 23 /* */ 24 /* These functions should be optional if you are writing a font server */ 25 /* or text layout engine on top of FreeType. However, they are pretty */ 26 /* handy for many other simple uses of the library. */ 27 /* */ 28 /*************************************************************************/ 29 30 31 #include <ft2build.h> 32 #include FT_INTERNAL_DEBUG_H 33 34 #include FT_GLYPH_H 35 #include FT_OUTLINE_H 36 #include FT_BITMAP_H 37 #include FT_INTERNAL_OBJECTS_H 38 39 #include "basepic.h" 40 41 /*************************************************************************/ 42 /* */ 43 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 44 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 45 /* messages during execution. */ 46 /* */ 47 #undef FT_COMPONENT 48 #define FT_COMPONENT trace_glyph 49 50 51 /*************************************************************************/ 52 /*************************************************************************/ 53 /**** ****/ 54 /**** FT_BitmapGlyph support ****/ 55 /**** ****/ 56 /*************************************************************************/ 57 /*************************************************************************/ 58 59 FT_CALLBACK_DEF( FT_Error ) 60 ft_bitmap_glyph_init( FT_Glyph bitmap_glyph, 61 FT_GlyphSlot slot ) 62 { 63 FT_BitmapGlyph glyph = (FT_BitmapGlyph)bitmap_glyph; 64 FT_Error error = FT_Err_Ok; 65 FT_Library library = FT_GLYPH( glyph )->library; 66 67 68 if ( slot->format != FT_GLYPH_FORMAT_BITMAP ) 69 { 70 error = FT_THROW( Invalid_Glyph_Format ); 71 goto Exit; 72 } 73 74 glyph->left = slot->bitmap_left; 75 glyph->top = slot->bitmap_top; 76 77 /* do lazy copying whenever possible */ 78 if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) 79 { 80 glyph->bitmap = slot->bitmap; 81 slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; 82 } 83 else 84 { 85 FT_Bitmap_Init( &glyph->bitmap ); 86 error = FT_Bitmap_Copy( library, &slot->bitmap, &glyph->bitmap ); 87 } 88 89 Exit: 90 return error; 91 } 92 93 94 FT_CALLBACK_DEF( FT_Error ) 95 ft_bitmap_glyph_copy( FT_Glyph bitmap_source, 96 FT_Glyph bitmap_target ) 97 { 98 FT_Library library = bitmap_source->library; 99 FT_BitmapGlyph source = (FT_BitmapGlyph)bitmap_source; 100 FT_BitmapGlyph target = (FT_BitmapGlyph)bitmap_target; 101 102 103 target->left = source->left; 104 target->top = source->top; 105 106 return FT_Bitmap_Copy( library, &source->bitmap, &target->bitmap ); 107 } 108 109 110 FT_CALLBACK_DEF( void ) 111 ft_bitmap_glyph_done( FT_Glyph bitmap_glyph ) 112 { 113 FT_BitmapGlyph glyph = (FT_BitmapGlyph)bitmap_glyph; 114 FT_Library library = FT_GLYPH( glyph )->library; 115 116 117 FT_Bitmap_Done( library, &glyph->bitmap ); 118 } 119 120 121 FT_CALLBACK_DEF( void ) 122 ft_bitmap_glyph_bbox( FT_Glyph bitmap_glyph, 123 FT_BBox* cbox ) 124 { 125 FT_BitmapGlyph glyph = (FT_BitmapGlyph)bitmap_glyph; 126 127 128 cbox->xMin = glyph->left * 64; 129 cbox->xMax = cbox->xMin + (FT_Pos)( glyph->bitmap.width * 64 ); 130 cbox->yMax = glyph->top * 64; 131 cbox->yMin = cbox->yMax - (FT_Pos)( glyph->bitmap.rows * 64 ); 132 } 133 134 135 FT_DEFINE_GLYPH( 136 ft_bitmap_glyph_class, 137 138 sizeof ( FT_BitmapGlyphRec ), 139 FT_GLYPH_FORMAT_BITMAP, 140 141 ft_bitmap_glyph_init, /* FT_Glyph_InitFunc glyph_init */ 142 ft_bitmap_glyph_done, /* FT_Glyph_DoneFunc glyph_done */ 143 ft_bitmap_glyph_copy, /* FT_Glyph_CopyFunc glyph_copy */ 144 NULL, /* FT_Glyph_TransformFunc glyph_transform */ 145 ft_bitmap_glyph_bbox, /* FT_Glyph_GetBBoxFunc glyph_bbox */ 146 NULL /* FT_Glyph_PrepareFunc glyph_prepare */ 147 ) 148 149 150 /*************************************************************************/ 151 /*************************************************************************/ 152 /**** ****/ 153 /**** FT_OutlineGlyph support ****/ 154 /**** ****/ 155 /*************************************************************************/ 156 /*************************************************************************/ 157 158 159 FT_CALLBACK_DEF( FT_Error ) 160 ft_outline_glyph_init( FT_Glyph outline_glyph, 161 FT_GlyphSlot slot ) 162 { 163 FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph; 164 FT_Error error = FT_Err_Ok; 165 FT_Library library = FT_GLYPH( glyph )->library; 166 FT_Outline* source = &slot->outline; 167 FT_Outline* target = &glyph->outline; 168 169 170 /* check format in glyph slot */ 171 if ( slot->format != FT_GLYPH_FORMAT_OUTLINE ) 172 { 173 error = FT_THROW( Invalid_Glyph_Format ); 174 goto Exit; 175 } 176 177 /* allocate new outline */ 178 error = FT_Outline_New( library, 179 (FT_UInt)source->n_points, 180 source->n_contours, 181 &glyph->outline ); 182 if ( error ) 183 goto Exit; 184 185 FT_Outline_Copy( source, target ); 186 187 Exit: 188 return error; 189 } 190 191 192 FT_CALLBACK_DEF( void ) 193 ft_outline_glyph_done( FT_Glyph outline_glyph ) 194 { 195 FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph; 196 197 198 FT_Outline_Done( FT_GLYPH( glyph )->library, &glyph->outline ); 199 } 200 201 202 FT_CALLBACK_DEF( FT_Error ) 203 ft_outline_glyph_copy( FT_Glyph outline_source, 204 FT_Glyph outline_target ) 205 { 206 FT_OutlineGlyph source = (FT_OutlineGlyph)outline_source; 207 FT_OutlineGlyph target = (FT_OutlineGlyph)outline_target; 208 FT_Error error; 209 FT_Library library = FT_GLYPH( source )->library; 210 211 212 error = FT_Outline_New( library, 213 (FT_UInt)source->outline.n_points, 214 source->outline.n_contours, 215 &target->outline ); 216 if ( !error ) 217 FT_Outline_Copy( &source->outline, &target->outline ); 218 219 return error; 220 } 221 222 223 FT_CALLBACK_DEF( void ) 224 ft_outline_glyph_transform( FT_Glyph outline_glyph, 225 const FT_Matrix* matrix, 226 const FT_Vector* delta ) 227 { 228 FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph; 229 230 231 if ( matrix ) 232 FT_Outline_Transform( &glyph->outline, matrix ); 233 234 if ( delta ) 235 FT_Outline_Translate( &glyph->outline, delta->x, delta->y ); 236 } 237 238 239 FT_CALLBACK_DEF( void ) 240 ft_outline_glyph_bbox( FT_Glyph outline_glyph, 241 FT_BBox* bbox ) 242 { 243 FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph; 244 245 246 FT_Outline_Get_CBox( &glyph->outline, bbox ); 247 } 248 249 250 FT_CALLBACK_DEF( FT_Error ) 251 ft_outline_glyph_prepare( FT_Glyph outline_glyph, 252 FT_GlyphSlot slot ) 253 { 254 FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph; 255 256 257 slot->format = FT_GLYPH_FORMAT_OUTLINE; 258 slot->outline = glyph->outline; 259 slot->outline.flags &= ~FT_OUTLINE_OWNER; 260 261 return FT_Err_Ok; 262 } 263 264 265 FT_DEFINE_GLYPH( 266 ft_outline_glyph_class, 267 268 sizeof ( FT_OutlineGlyphRec ), 269 FT_GLYPH_FORMAT_OUTLINE, 270 271 ft_outline_glyph_init, /* FT_Glyph_InitFunc glyph_init */ 272 ft_outline_glyph_done, /* FT_Glyph_DoneFunc glyph_done */ 273 ft_outline_glyph_copy, /* FT_Glyph_CopyFunc glyph_copy */ 274 ft_outline_glyph_transform, /* FT_Glyph_TransformFunc glyph_transform */ 275 ft_outline_glyph_bbox, /* FT_Glyph_GetBBoxFunc glyph_bbox */ 276 ft_outline_glyph_prepare /* FT_Glyph_PrepareFunc glyph_prepare */ 277 ) 278 279 280 /*************************************************************************/ 281 /*************************************************************************/ 282 /**** ****/ 283 /**** FT_Glyph class and API ****/ 284 /**** ****/ 285 /*************************************************************************/ 286 /*************************************************************************/ 287 288 static FT_Error 289 ft_new_glyph( FT_Library library, 290 const FT_Glyph_Class* clazz, 291 FT_Glyph* aglyph ) 292 { 293 FT_Memory memory = library->memory; 294 FT_Error error; 295 FT_Glyph glyph = NULL; 296 297 298 *aglyph = NULL; 299 300 if ( !FT_ALLOC( glyph, clazz->glyph_size ) ) 301 { 302 glyph->library = library; 303 glyph->clazz = clazz; 304 glyph->format = clazz->glyph_format; 305 306 *aglyph = glyph; 307 } 308 309 return error; 310 } 311 312 313 /* documentation is in ftglyph.h */ 314 315 FT_EXPORT_DEF( FT_Error ) 316 FT_Glyph_Copy( FT_Glyph source, 317 FT_Glyph *target ) 318 { 319 FT_Glyph copy; 320 FT_Error error; 321 const FT_Glyph_Class* clazz; 322 323 324 /* check arguments */ 325 if ( !target || !source || !source->clazz ) 326 { 327 error = FT_THROW( Invalid_Argument ); 328 goto Exit; 329 } 330 331 *target = NULL; 332 333 if ( !source || !source->clazz ) 334 { 335 error = FT_THROW( Invalid_Argument ); 336 goto Exit; 337 } 338 339 clazz = source->clazz; 340 error = ft_new_glyph( source->library, clazz, © ); 341 if ( error ) 342 goto Exit; 343 344 copy->advance = source->advance; 345 copy->format = source->format; 346 347 if ( clazz->glyph_copy ) 348 error = clazz->glyph_copy( source, copy ); 349 350 if ( error ) 351 FT_Done_Glyph( copy ); 352 else 353 *target = copy; 354 355 Exit: 356 return error; 357 } 358 359 360 /* documentation is in ftglyph.h */ 361 362 FT_EXPORT_DEF( FT_Error ) 363 FT_Get_Glyph( FT_GlyphSlot slot, 364 FT_Glyph *aglyph ) 365 { 366 FT_Library library; 367 FT_Error error; 368 FT_Glyph glyph; 369 370 const FT_Glyph_Class* clazz = NULL; 371 372 373 if ( !slot ) 374 return FT_THROW( Invalid_Slot_Handle ); 375 376 library = slot->library; 377 378 if ( !aglyph ) 379 return FT_THROW( Invalid_Argument ); 380 381 /* if it is a bitmap, that's easy :-) */ 382 if ( slot->format == FT_GLYPH_FORMAT_BITMAP ) 383 clazz = FT_BITMAP_GLYPH_CLASS_GET; 384 385 /* if it is an outline */ 386 else if ( slot->format == FT_GLYPH_FORMAT_OUTLINE ) 387 clazz = FT_OUTLINE_GLYPH_CLASS_GET; 388 389 else 390 { 391 /* try to find a renderer that supports the glyph image format */ 392 FT_Renderer render = FT_Lookup_Renderer( library, slot->format, 0 ); 393 394 395 if ( render ) 396 clazz = &render->glyph_class; 397 } 398 399 if ( !clazz ) 400 { 401 error = FT_THROW( Invalid_Glyph_Format ); 402 goto Exit; 403 } 404 405 /* create FT_Glyph object */ 406 error = ft_new_glyph( library, clazz, &glyph ); 407 if ( error ) 408 goto Exit; 409 410 /* copy advance while converting 26.6 to 16.16 format */ 411 if ( slot->advance.x >= 0x8000L * 64 || 412 slot->advance.x <= -0x8000L * 64 ) 413 { 414 FT_ERROR(( "FT_Get_Glyph: advance width too large\n" )); 415 error = FT_THROW( Invalid_Argument ); 416 goto Exit2; 417 } 418 if ( slot->advance.y >= 0x8000L * 64 || 419 slot->advance.y <= -0x8000L * 64 ) 420 { 421 FT_ERROR(( "FT_Get_Glyph: advance height too large\n" )); 422 error = FT_THROW( Invalid_Argument ); 423 goto Exit2; 424 } 425 426 glyph->advance.x = slot->advance.x * 1024; 427 glyph->advance.y = slot->advance.y * 1024; 428 429 /* now import the image from the glyph slot */ 430 error = clazz->glyph_init( glyph, slot ); 431 432 Exit2: 433 /* if an error occurred, destroy the glyph */ 434 if ( error ) 435 FT_Done_Glyph( glyph ); 436 else 437 *aglyph = glyph; 438 439 Exit: 440 return error; 441 } 442 443 444 /* documentation is in ftglyph.h */ 445 446 FT_EXPORT_DEF( FT_Error ) 447 FT_Glyph_Transform( FT_Glyph glyph, 448 FT_Matrix* matrix, 449 FT_Vector* delta ) 450 { 451 FT_Error error = FT_Err_Ok; 452 453 454 if ( !glyph || !glyph->clazz ) 455 error = FT_THROW( Invalid_Argument ); 456 else 457 { 458 const FT_Glyph_Class* clazz = glyph->clazz; 459 460 461 if ( clazz->glyph_transform ) 462 { 463 /* transform glyph image */ 464 clazz->glyph_transform( glyph, matrix, delta ); 465 466 /* transform advance vector */ 467 if ( matrix ) 468 FT_Vector_Transform( &glyph->advance, matrix ); 469 } 470 else 471 error = FT_THROW( Invalid_Glyph_Format ); 472 } 473 return error; 474 } 475 476 477 /* documentation is in ftglyph.h */ 478 479 FT_EXPORT_DEF( void ) 480 FT_Glyph_Get_CBox( FT_Glyph glyph, 481 FT_UInt bbox_mode, 482 FT_BBox *acbox ) 483 { 484 const FT_Glyph_Class* clazz; 485 486 487 if ( !acbox ) 488 return; 489 490 acbox->xMin = acbox->yMin = acbox->xMax = acbox->yMax = 0; 491 492 if ( !glyph || !glyph->clazz ) 493 return; 494 495 clazz = glyph->clazz; 496 if ( !clazz->glyph_bbox ) 497 return; 498 499 /* retrieve bbox in 26.6 coordinates */ 500 clazz->glyph_bbox( glyph, acbox ); 501 502 /* perform grid fitting if needed */ 503 if ( bbox_mode == FT_GLYPH_BBOX_GRIDFIT || 504 bbox_mode == FT_GLYPH_BBOX_PIXELS ) 505 { 506 acbox->xMin = FT_PIX_FLOOR( acbox->xMin ); 507 acbox->yMin = FT_PIX_FLOOR( acbox->yMin ); 508 acbox->xMax = FT_PIX_CEIL( acbox->xMax ); 509 acbox->yMax = FT_PIX_CEIL( acbox->yMax ); 510 } 511 512 /* convert to integer pixels if needed */ 513 if ( bbox_mode == FT_GLYPH_BBOX_TRUNCATE || 514 bbox_mode == FT_GLYPH_BBOX_PIXELS ) 515 { 516 acbox->xMin >>= 6; 517 acbox->yMin >>= 6; 518 acbox->xMax >>= 6; 519 acbox->yMax >>= 6; 520 } 521 } 522 523 524 /* documentation is in ftglyph.h */ 525 526 FT_EXPORT_DEF( FT_Error ) 527 FT_Glyph_To_Bitmap( FT_Glyph* the_glyph, 528 FT_Render_Mode render_mode, 529 FT_Vector* origin, 530 FT_Bool destroy ) 531 { 532 FT_GlyphSlotRec dummy; 533 FT_GlyphSlot_InternalRec dummy_internal; 534 FT_Error error = FT_Err_Ok; 535 FT_Glyph b, glyph; 536 FT_BitmapGlyph bitmap = NULL; 537 const FT_Glyph_Class* clazz; 538 539 /* FT_BITMAP_GLYPH_CLASS_GET dereferences `library' in PIC mode */ 540 FT_Library library; 541 542 543 /* check argument */ 544 if ( !the_glyph ) 545 goto Bad; 546 glyph = *the_glyph; 547 if ( !glyph ) 548 goto Bad; 549 550 clazz = glyph->clazz; 551 library = glyph->library; 552 if ( !library || !clazz ) 553 goto Bad; 554 555 /* when called with a bitmap glyph, do nothing and return successfully */ 556 if ( clazz == FT_BITMAP_GLYPH_CLASS_GET ) 557 goto Exit; 558 559 if ( !clazz->glyph_prepare ) 560 goto Bad; 561 562 /* we render the glyph into a glyph bitmap using a `dummy' glyph slot */ 563 /* then calling FT_Render_Glyph_Internal() */ 564 565 FT_ZERO( &dummy ); 566 FT_ZERO( &dummy_internal ); 567 dummy.internal = &dummy_internal; 568 dummy.library = library; 569 dummy.format = clazz->glyph_format; 570 571 /* create result bitmap glyph */ 572 error = ft_new_glyph( library, FT_BITMAP_GLYPH_CLASS_GET, &b ); 573 if ( error ) 574 goto Exit; 575 bitmap = (FT_BitmapGlyph)b; 576 577 #if 1 578 /* if `origin' is set, translate the glyph image */ 579 if ( origin ) 580 FT_Glyph_Transform( glyph, 0, origin ); 581 #else 582 FT_UNUSED( origin ); 583 #endif 584 585 /* prepare dummy slot for rendering */ 586 error = clazz->glyph_prepare( glyph, &dummy ); 587 if ( !error ) 588 error = FT_Render_Glyph_Internal( glyph->library, &dummy, render_mode ); 589 590 #if 1 591 if ( !destroy && origin ) 592 { 593 FT_Vector v; 594 595 596 v.x = -origin->x; 597 v.y = -origin->y; 598 FT_Glyph_Transform( glyph, 0, &v ); 599 } 600 #endif 601 602 if ( error ) 603 goto Exit; 604 605 /* in case of success, copy the bitmap to the glyph bitmap */ 606 error = ft_bitmap_glyph_init( (FT_Glyph)bitmap, &dummy ); 607 if ( error ) 608 goto Exit; 609 610 /* copy advance */ 611 bitmap->root.advance = glyph->advance; 612 613 if ( destroy ) 614 FT_Done_Glyph( glyph ); 615 616 *the_glyph = FT_GLYPH( bitmap ); 617 618 Exit: 619 if ( error && bitmap ) 620 FT_Done_Glyph( FT_GLYPH( bitmap ) ); 621 622 return error; 623 624 Bad: 625 error = FT_THROW( Invalid_Argument ); 626 goto Exit; 627 } 628 629 630 /* documentation is in ftglyph.h */ 631 632 FT_EXPORT_DEF( void ) 633 FT_Done_Glyph( FT_Glyph glyph ) 634 { 635 if ( glyph ) 636 { 637 FT_Memory memory = glyph->library->memory; 638 const FT_Glyph_Class* clazz = glyph->clazz; 639 640 641 if ( clazz->glyph_done ) 642 clazz->glyph_done( glyph ); 643 644 FT_FREE( glyph ); 645 } 646 } 647 648 649 /* END */ 650
