1 /***************************************************************************/ 2 /* */ 3 /* ftglyph.c */ 4 /* */ 5 /* FreeType convenience functions to handle glyphs (body). */ 6 /* */ 7 /* Copyright 1996-2015 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 << 6; 129 cbox->xMax = cbox->xMin + (FT_Pos)( glyph->bitmap.width << 6 ); 130 cbox->yMax = glyph->top << 6; 131 cbox->yMin = cbox->yMax - (FT_Pos)( glyph->bitmap.rows << 6 ); 132 } 133 134 135 FT_DEFINE_GLYPH(ft_bitmap_glyph_class, 136 sizeof ( FT_BitmapGlyphRec ), 137 FT_GLYPH_FORMAT_BITMAP, 138 139 ft_bitmap_glyph_init, 140 ft_bitmap_glyph_done, 141 ft_bitmap_glyph_copy, 142 0, /* FT_Glyph_TransformFunc */ 143 ft_bitmap_glyph_bbox, 144 0 /* FT_Glyph_PrepareFunc */ 145 ) 146 147 148 /*************************************************************************/ 149 /*************************************************************************/ 150 /**** ****/ 151 /**** FT_OutlineGlyph support ****/ 152 /**** ****/ 153 /*************************************************************************/ 154 /*************************************************************************/ 155 156 157 FT_CALLBACK_DEF( FT_Error ) 158 ft_outline_glyph_init( FT_Glyph outline_glyph, 159 FT_GlyphSlot slot ) 160 { 161 FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph; 162 FT_Error error = FT_Err_Ok; 163 FT_Library library = FT_GLYPH( glyph )->library; 164 FT_Outline* source = &slot->outline; 165 FT_Outline* target = &glyph->outline; 166 167 168 /* check format in glyph slot */ 169 if ( slot->format != FT_GLYPH_FORMAT_OUTLINE ) 170 { 171 error = FT_THROW( Invalid_Glyph_Format ); 172 goto Exit; 173 } 174 175 /* allocate new outline */ 176 error = FT_Outline_New( library, 177 (FT_UInt)source->n_points, 178 source->n_contours, 179 &glyph->outline ); 180 if ( error ) 181 goto Exit; 182 183 FT_Outline_Copy( source, target ); 184 185 Exit: 186 return error; 187 } 188 189 190 FT_CALLBACK_DEF( void ) 191 ft_outline_glyph_done( FT_Glyph outline_glyph ) 192 { 193 FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph; 194 195 196 FT_Outline_Done( FT_GLYPH( glyph )->library, &glyph->outline ); 197 } 198 199 200 FT_CALLBACK_DEF( FT_Error ) 201 ft_outline_glyph_copy( FT_Glyph outline_source, 202 FT_Glyph outline_target ) 203 { 204 FT_OutlineGlyph source = (FT_OutlineGlyph)outline_source; 205 FT_OutlineGlyph target = (FT_OutlineGlyph)outline_target; 206 FT_Error error; 207 FT_Library library = FT_GLYPH( source )->library; 208 209 210 error = FT_Outline_New( library, 211 (FT_UInt)source->outline.n_points, 212 source->outline.n_contours, 213 &target->outline ); 214 if ( !error ) 215 FT_Outline_Copy( &source->outline, &target->outline ); 216 217 return error; 218 } 219 220 221 FT_CALLBACK_DEF( void ) 222 ft_outline_glyph_transform( FT_Glyph outline_glyph, 223 const FT_Matrix* matrix, 224 const FT_Vector* delta ) 225 { 226 FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph; 227 228 229 if ( matrix ) 230 FT_Outline_Transform( &glyph->outline, matrix ); 231 232 if ( delta ) 233 FT_Outline_Translate( &glyph->outline, delta->x, delta->y ); 234 } 235 236 237 FT_CALLBACK_DEF( void ) 238 ft_outline_glyph_bbox( FT_Glyph outline_glyph, 239 FT_BBox* bbox ) 240 { 241 FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph; 242 243 244 FT_Outline_Get_CBox( &glyph->outline, bbox ); 245 } 246 247 248 FT_CALLBACK_DEF( FT_Error ) 249 ft_outline_glyph_prepare( FT_Glyph outline_glyph, 250 FT_GlyphSlot slot ) 251 { 252 FT_OutlineGlyph glyph = (FT_OutlineGlyph)outline_glyph; 253 254 255 slot->format = FT_GLYPH_FORMAT_OUTLINE; 256 slot->outline = glyph->outline; 257 slot->outline.flags &= ~FT_OUTLINE_OWNER; 258 259 return FT_Err_Ok; 260 } 261 262 263 FT_DEFINE_GLYPH( ft_outline_glyph_class, 264 sizeof ( FT_OutlineGlyphRec ), 265 FT_GLYPH_FORMAT_OUTLINE, 266 267 ft_outline_glyph_init, 268 ft_outline_glyph_done, 269 ft_outline_glyph_copy, 270 ft_outline_glyph_transform, 271 ft_outline_glyph_bbox, 272 ft_outline_glyph_prepare 273 ) 274 275 276 /*************************************************************************/ 277 /*************************************************************************/ 278 /**** ****/ 279 /**** FT_Glyph class and API ****/ 280 /**** ****/ 281 /*************************************************************************/ 282 /*************************************************************************/ 283 284 static FT_Error 285 ft_new_glyph( FT_Library library, 286 const FT_Glyph_Class* clazz, 287 FT_Glyph* aglyph ) 288 { 289 FT_Memory memory = library->memory; 290 FT_Error error; 291 FT_Glyph glyph = NULL; 292 293 294 *aglyph = NULL; 295 296 if ( !FT_ALLOC( glyph, clazz->glyph_size ) ) 297 { 298 glyph->library = library; 299 glyph->clazz = clazz; 300 glyph->format = clazz->glyph_format; 301 302 *aglyph = glyph; 303 } 304 305 return error; 306 } 307 308 309 /* documentation is in ftglyph.h */ 310 311 FT_EXPORT_DEF( FT_Error ) 312 FT_Glyph_Copy( FT_Glyph source, 313 FT_Glyph *target ) 314 { 315 FT_Glyph copy; 316 FT_Error error; 317 const FT_Glyph_Class* clazz; 318 319 320 /* check arguments */ 321 if ( !target || !source || !source->clazz ) 322 { 323 error = FT_THROW( Invalid_Argument ); 324 goto Exit; 325 } 326 327 *target = NULL; 328 329 if ( !source || !source->clazz ) 330 { 331 error = FT_THROW( Invalid_Argument ); 332 goto Exit; 333 } 334 335 clazz = source->clazz; 336 error = ft_new_glyph( source->library, clazz, © ); 337 if ( error ) 338 goto Exit; 339 340 copy->advance = source->advance; 341 copy->format = source->format; 342 343 if ( clazz->glyph_copy ) 344 error = clazz->glyph_copy( source, copy ); 345 346 if ( error ) 347 FT_Done_Glyph( copy ); 348 else 349 *target = copy; 350 351 Exit: 352 return error; 353 } 354 355 356 /* documentation is in ftglyph.h */ 357 358 FT_EXPORT_DEF( FT_Error ) 359 FT_Get_Glyph( FT_GlyphSlot slot, 360 FT_Glyph *aglyph ) 361 { 362 FT_Library library; 363 FT_Error error; 364 FT_Glyph glyph; 365 366 const FT_Glyph_Class* clazz = NULL; 367 368 369 if ( !slot ) 370 return FT_THROW( Invalid_Slot_Handle ); 371 372 library = slot->library; 373 374 if ( !aglyph ) 375 return FT_THROW( Invalid_Argument ); 376 377 /* if it is a bitmap, that's easy :-) */ 378 if ( slot->format == FT_GLYPH_FORMAT_BITMAP ) 379 clazz = FT_BITMAP_GLYPH_CLASS_GET; 380 381 /* if it is an outline */ 382 else if ( slot->format == FT_GLYPH_FORMAT_OUTLINE ) 383 clazz = FT_OUTLINE_GLYPH_CLASS_GET; 384 385 else 386 { 387 /* try to find a renderer that supports the glyph image format */ 388 FT_Renderer render = FT_Lookup_Renderer( library, slot->format, 0 ); 389 390 391 if ( render ) 392 clazz = &render->glyph_class; 393 } 394 395 if ( !clazz ) 396 { 397 error = FT_THROW( Invalid_Glyph_Format ); 398 goto Exit; 399 } 400 401 /* create FT_Glyph object */ 402 error = ft_new_glyph( library, clazz, &glyph ); 403 if ( error ) 404 goto Exit; 405 406 /* copy advance while converting it to 16.16 format */ 407 glyph->advance.x = slot->advance.x << 10; 408 glyph->advance.y = slot->advance.y << 10; 409 410 /* now import the image from the glyph slot */ 411 error = clazz->glyph_init( glyph, slot ); 412 413 /* if an error occurred, destroy the glyph */ 414 if ( error ) 415 FT_Done_Glyph( glyph ); 416 else 417 *aglyph = glyph; 418 419 Exit: 420 return error; 421 } 422 423 424 /* documentation is in ftglyph.h */ 425 426 FT_EXPORT_DEF( FT_Error ) 427 FT_Glyph_Transform( FT_Glyph glyph, 428 FT_Matrix* matrix, 429 FT_Vector* delta ) 430 { 431 FT_Error error = FT_Err_Ok; 432 433 434 if ( !glyph || !glyph->clazz ) 435 error = FT_THROW( Invalid_Argument ); 436 else 437 { 438 const FT_Glyph_Class* clazz = glyph->clazz; 439 440 441 if ( clazz->glyph_transform ) 442 { 443 /* transform glyph image */ 444 clazz->glyph_transform( glyph, matrix, delta ); 445 446 /* transform advance vector */ 447 if ( matrix ) 448 FT_Vector_Transform( &glyph->advance, matrix ); 449 } 450 else 451 error = FT_THROW( Invalid_Glyph_Format ); 452 } 453 return error; 454 } 455 456 457 /* documentation is in ftglyph.h */ 458 459 FT_EXPORT_DEF( void ) 460 FT_Glyph_Get_CBox( FT_Glyph glyph, 461 FT_UInt bbox_mode, 462 FT_BBox *acbox ) 463 { 464 const FT_Glyph_Class* clazz; 465 466 467 if ( !acbox ) 468 return; 469 470 acbox->xMin = acbox->yMin = acbox->xMax = acbox->yMax = 0; 471 472 if ( !glyph || !glyph->clazz ) 473 return; 474 475 clazz = glyph->clazz; 476 if ( !clazz->glyph_bbox ) 477 return; 478 479 /* retrieve bbox in 26.6 coordinates */ 480 clazz->glyph_bbox( glyph, acbox ); 481 482 /* perform grid fitting if needed */ 483 if ( bbox_mode == FT_GLYPH_BBOX_GRIDFIT || 484 bbox_mode == FT_GLYPH_BBOX_PIXELS ) 485 { 486 acbox->xMin = FT_PIX_FLOOR( acbox->xMin ); 487 acbox->yMin = FT_PIX_FLOOR( acbox->yMin ); 488 acbox->xMax = FT_PIX_CEIL( acbox->xMax ); 489 acbox->yMax = FT_PIX_CEIL( acbox->yMax ); 490 } 491 492 /* convert to integer pixels if needed */ 493 if ( bbox_mode == FT_GLYPH_BBOX_TRUNCATE || 494 bbox_mode == FT_GLYPH_BBOX_PIXELS ) 495 { 496 acbox->xMin >>= 6; 497 acbox->yMin >>= 6; 498 acbox->xMax >>= 6; 499 acbox->yMax >>= 6; 500 } 501 } 502 503 504 /* documentation is in ftglyph.h */ 505 506 FT_EXPORT_DEF( FT_Error ) 507 FT_Glyph_To_Bitmap( FT_Glyph* the_glyph, 508 FT_Render_Mode render_mode, 509 FT_Vector* origin, 510 FT_Bool destroy ) 511 { 512 FT_GlyphSlotRec dummy; 513 FT_GlyphSlot_InternalRec dummy_internal; 514 FT_Error error = FT_Err_Ok; 515 FT_Glyph b, glyph; 516 FT_BitmapGlyph bitmap = NULL; 517 const FT_Glyph_Class* clazz; 518 519 /* FT_BITMAP_GLYPH_CLASS_GET dereferences `library' in PIC mode */ 520 FT_Library library; 521 522 523 /* check argument */ 524 if ( !the_glyph ) 525 goto Bad; 526 glyph = *the_glyph; 527 if ( !glyph ) 528 goto Bad; 529 530 clazz = glyph->clazz; 531 library = glyph->library; 532 if ( !library || !clazz ) 533 goto Bad; 534 535 /* when called with a bitmap glyph, do nothing and return successfully */ 536 if ( clazz == FT_BITMAP_GLYPH_CLASS_GET ) 537 goto Exit; 538 539 if ( !clazz->glyph_prepare ) 540 goto Bad; 541 542 /* we render the glyph into a glyph bitmap using a `dummy' glyph slot */ 543 /* then calling FT_Render_Glyph_Internal() */ 544 545 FT_MEM_ZERO( &dummy, sizeof ( dummy ) ); 546 FT_MEM_ZERO( &dummy_internal, sizeof ( dummy_internal ) ); 547 dummy.internal = &dummy_internal; 548 dummy.library = library; 549 dummy.format = clazz->glyph_format; 550 551 /* create result bitmap glyph */ 552 error = ft_new_glyph( library, FT_BITMAP_GLYPH_CLASS_GET, &b ); 553 if ( error ) 554 goto Exit; 555 bitmap = (FT_BitmapGlyph)b; 556 557 #if 1 558 /* if `origin' is set, translate the glyph image */ 559 if ( origin ) 560 FT_Glyph_Transform( glyph, 0, origin ); 561 #else 562 FT_UNUSED( origin ); 563 #endif 564 565 /* prepare dummy slot for rendering */ 566 error = clazz->glyph_prepare( glyph, &dummy ); 567 if ( !error ) 568 error = FT_Render_Glyph_Internal( glyph->library, &dummy, render_mode ); 569 570 #if 1 571 if ( !destroy && origin ) 572 { 573 FT_Vector v; 574 575 576 v.x = -origin->x; 577 v.y = -origin->y; 578 FT_Glyph_Transform( glyph, 0, &v ); 579 } 580 #endif 581 582 if ( error ) 583 goto Exit; 584 585 /* in case of success, copy the bitmap to the glyph bitmap */ 586 error = ft_bitmap_glyph_init( (FT_Glyph)bitmap, &dummy ); 587 if ( error ) 588 goto Exit; 589 590 /* copy advance */ 591 bitmap->root.advance = glyph->advance; 592 593 if ( destroy ) 594 FT_Done_Glyph( glyph ); 595 596 *the_glyph = FT_GLYPH( bitmap ); 597 598 Exit: 599 if ( error && bitmap ) 600 FT_Done_Glyph( FT_GLYPH( bitmap ) ); 601 602 return error; 603 604 Bad: 605 error = FT_THROW( Invalid_Argument ); 606 goto Exit; 607 } 608 609 610 /* documentation is in ftglyph.h */ 611 612 FT_EXPORT_DEF( void ) 613 FT_Done_Glyph( FT_Glyph glyph ) 614 { 615 if ( glyph ) 616 { 617 FT_Memory memory = glyph->library->memory; 618 const FT_Glyph_Class* clazz = glyph->clazz; 619 620 621 if ( clazz->glyph_done ) 622 clazz->glyph_done( glyph ); 623 624 FT_FREE( glyph ); 625 } 626 } 627 628 629 /* END */ 630
