1 /***************************************************************************/ 2 /* */ 3 /* ftbitmap.c */ 4 /* */ 5 /* FreeType utility functions for bitmaps (body). */ 6 /* */ 7 /* Copyright 2004, 2005, 2006, 2007, 2008, 2009 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 FT_BITMAP_H 21 #include FT_IMAGE_H 22 #include FT_INTERNAL_OBJECTS_H 23 24 25 static 26 const FT_Bitmap null_bitmap = { 0, 0, 0, 0, 0, 0, 0, 0 }; 27 28 29 /* documentation is in ftbitmap.h */ 30 31 FT_EXPORT_DEF( void ) FT_Bitmap_New(FT_Bitmap * abitmap)32 FT_Bitmap_New( FT_Bitmap *abitmap ) 33 { 34 *abitmap = null_bitmap; 35 } 36 37 38 /* documentation is in ftbitmap.h */ 39 40 FT_EXPORT_DEF( FT_Error ) FT_Bitmap_Copy(FT_Library library,const FT_Bitmap * source,FT_Bitmap * target)41 FT_Bitmap_Copy( FT_Library library, 42 const FT_Bitmap *source, 43 FT_Bitmap *target) 44 { 45 FT_Memory memory = library->memory; 46 FT_Error error = FT_Err_Ok; 47 FT_Int pitch = source->pitch; 48 FT_ULong size; 49 50 51 if ( source == target ) 52 return FT_Err_Ok; 53 54 if ( source->buffer == NULL ) 55 { 56 *target = *source; 57 58 return FT_Err_Ok; 59 } 60 61 if ( pitch < 0 ) 62 pitch = -pitch; 63 size = (FT_ULong)( pitch * source->rows ); 64 65 if ( target->buffer ) 66 { 67 FT_Int target_pitch = target->pitch; 68 FT_ULong target_size; 69 70 71 if ( target_pitch < 0 ) 72 target_pitch = -target_pitch; 73 target_size = (FT_ULong)( target_pitch * target->rows ); 74 75 if ( target_size != size ) 76 (void)FT_QREALLOC( target->buffer, target_size, size ); 77 } 78 else 79 (void)FT_QALLOC( target->buffer, size ); 80 81 if ( !error ) 82 { 83 unsigned char *p; 84 85 86 p = target->buffer; 87 *target = *source; 88 target->buffer = p; 89 90 FT_MEM_COPY( target->buffer, source->buffer, size ); 91 } 92 93 return error; 94 } 95 96 97 static FT_Error ft_bitmap_assure_buffer(FT_Memory memory,FT_Bitmap * bitmap,FT_UInt xpixels,FT_UInt ypixels)98 ft_bitmap_assure_buffer( FT_Memory memory, 99 FT_Bitmap* bitmap, 100 FT_UInt xpixels, 101 FT_UInt ypixels ) 102 { 103 FT_Error error; 104 int pitch; 105 int new_pitch; 106 FT_UInt bpp; 107 FT_Int i, width, height; 108 unsigned char* buffer; 109 110 111 width = bitmap->width; 112 height = bitmap->rows; 113 pitch = bitmap->pitch; 114 if ( pitch < 0 ) 115 pitch = -pitch; 116 117 switch ( bitmap->pixel_mode ) 118 { 119 case FT_PIXEL_MODE_MONO: 120 bpp = 1; 121 new_pitch = ( width + xpixels + 7 ) >> 3; 122 break; 123 case FT_PIXEL_MODE_GRAY2: 124 bpp = 2; 125 new_pitch = ( width + xpixels + 3 ) >> 2; 126 break; 127 case FT_PIXEL_MODE_GRAY4: 128 bpp = 4; 129 new_pitch = ( width + xpixels + 1 ) >> 1; 130 break; 131 case FT_PIXEL_MODE_GRAY: 132 case FT_PIXEL_MODE_LCD: 133 case FT_PIXEL_MODE_LCD_V: 134 bpp = 8; 135 new_pitch = ( width + xpixels ); 136 break; 137 default: 138 return FT_Err_Invalid_Glyph_Format; 139 } 140 141 /* if no need to allocate memory */ 142 if ( ypixels == 0 && new_pitch <= pitch ) 143 { 144 /* zero the padding */ 145 FT_Int bit_width = pitch * 8; 146 FT_Int bit_last = ( width + xpixels ) * bpp; 147 148 149 if ( bit_last < bit_width ) 150 { 151 FT_Byte* line = bitmap->buffer + ( bit_last >> 3 ); 152 FT_Byte* end = bitmap->buffer + pitch; 153 FT_Int shift = bit_last & 7; 154 FT_UInt mask = 0xFF00U >> shift; 155 FT_Int count = height; 156 157 158 for ( ; count > 0; count--, line += pitch, end += pitch ) 159 { 160 FT_Byte* write = line; 161 162 163 if ( shift > 0 ) 164 { 165 write[0] = (FT_Byte)( write[0] & mask ); 166 write++; 167 } 168 if ( write < end ) 169 FT_MEM_ZERO( write, end-write ); 170 } 171 } 172 173 return FT_Err_Ok; 174 } 175 176 if ( FT_QALLOC_MULT( buffer, new_pitch, bitmap->rows + ypixels ) ) 177 return error; 178 179 if ( bitmap->pitch > 0 ) 180 { 181 FT_Int len = ( width * bpp + 7 ) >> 3; 182 183 184 for ( i = 0; i < bitmap->rows; i++ ) 185 FT_MEM_COPY( buffer + new_pitch * ( ypixels + i ), 186 bitmap->buffer + pitch * i, len ); 187 } 188 else 189 { 190 FT_Int len = ( width * bpp + 7 ) >> 3; 191 192 193 for ( i = 0; i < bitmap->rows; i++ ) 194 FT_MEM_COPY( buffer + new_pitch * i, 195 bitmap->buffer + pitch * i, len ); 196 } 197 198 FT_FREE( bitmap->buffer ); 199 bitmap->buffer = buffer; 200 201 if ( bitmap->pitch < 0 ) 202 new_pitch = -new_pitch; 203 204 /* set pitch only, width and height are left untouched */ 205 bitmap->pitch = new_pitch; 206 207 return FT_Err_Ok; 208 } 209 210 211 /* documentation is in ftbitmap.h */ 212 213 FT_EXPORT_DEF( FT_Error ) FT_Bitmap_Embolden(FT_Library library,FT_Bitmap * bitmap,FT_Pos xStrength,FT_Pos yStrength)214 FT_Bitmap_Embolden( FT_Library library, 215 FT_Bitmap* bitmap, 216 FT_Pos xStrength, 217 FT_Pos yStrength ) 218 { 219 FT_Error error; 220 unsigned char* p; 221 FT_Int i, x, y, pitch; 222 FT_Int xstr, ystr; 223 224 225 if ( !library ) 226 return FT_Err_Invalid_Library_Handle; 227 228 if ( !bitmap || !bitmap->buffer ) 229 return FT_Err_Invalid_Argument; 230 231 xstr = FT_PIX_ROUND( xStrength ) >> 6; 232 ystr = FT_PIX_ROUND( yStrength ) >> 6; 233 234 if ( xstr == 0 && ystr == 0 ) 235 return FT_Err_Ok; 236 else if ( xstr < 0 || ystr < 0 ) 237 return FT_Err_Invalid_Argument; 238 239 switch ( bitmap->pixel_mode ) 240 { 241 case FT_PIXEL_MODE_GRAY2: 242 case FT_PIXEL_MODE_GRAY4: 243 { 244 FT_Bitmap tmp; 245 FT_Int align; 246 247 248 if ( bitmap->pixel_mode == FT_PIXEL_MODE_GRAY2 ) 249 align = ( bitmap->width + xstr + 3 ) / 4; 250 else 251 align = ( bitmap->width + xstr + 1 ) / 2; 252 253 FT_Bitmap_New( &tmp ); 254 255 error = FT_Bitmap_Convert( library, bitmap, &tmp, align ); 256 if ( error ) 257 return error; 258 259 FT_Bitmap_Done( library, bitmap ); 260 *bitmap = tmp; 261 } 262 break; 263 264 case FT_PIXEL_MODE_MONO: 265 if ( xstr > 8 ) 266 xstr = 8; 267 break; 268 269 case FT_PIXEL_MODE_LCD: 270 xstr *= 3; 271 break; 272 273 case FT_PIXEL_MODE_LCD_V: 274 ystr *= 3; 275 break; 276 } 277 278 error = ft_bitmap_assure_buffer( library->memory, bitmap, xstr, ystr ); 279 if ( error ) 280 return error; 281 282 pitch = bitmap->pitch; 283 if ( pitch > 0 ) 284 p = bitmap->buffer + pitch * ystr; 285 else 286 { 287 pitch = -pitch; 288 p = bitmap->buffer + pitch * ( bitmap->rows - 1 ); 289 } 290 291 /* for each row */ 292 for ( y = 0; y < bitmap->rows ; y++ ) 293 { 294 /* 295 * Horizontally: 296 * 297 * From the last pixel on, make each pixel or'ed with the 298 * `xstr' pixels before it. 299 */ 300 for ( x = pitch - 1; x >= 0; x-- ) 301 { 302 unsigned char tmp; 303 304 305 tmp = p[x]; 306 for ( i = 1; i <= xstr; i++ ) 307 { 308 if ( bitmap->pixel_mode == FT_PIXEL_MODE_MONO ) 309 { 310 p[x] |= tmp >> i; 311 312 /* the maximum value of 8 for `xstr' comes from here */ 313 if ( x > 0 ) 314 p[x] |= p[x - 1] << ( 8 - i ); 315 316 #if 0 317 if ( p[x] == 0xff ) 318 break; 319 #endif 320 } 321 else 322 { 323 if ( x - i >= 0 ) 324 { 325 if ( p[x] + p[x - i] > bitmap->num_grays - 1 ) 326 { 327 p[x] = (unsigned char)(bitmap->num_grays - 1); 328 break; 329 } 330 else 331 { 332 p[x] = (unsigned char)(p[x] + p[x-i]); 333 if ( p[x] == bitmap->num_grays - 1 ) 334 break; 335 } 336 } 337 else 338 break; 339 } 340 } 341 } 342 343 /* 344 * Vertically: 345 * 346 * Make the above `ystr' rows or'ed with it. 347 */ 348 for ( x = 1; x <= ystr; x++ ) 349 { 350 unsigned char* q; 351 352 353 q = p - bitmap->pitch * x; 354 for ( i = 0; i < pitch; i++ ) 355 q[i] |= p[i]; 356 } 357 358 p += bitmap->pitch; 359 } 360 361 bitmap->width += xstr; 362 bitmap->rows += ystr; 363 364 return FT_Err_Ok; 365 } 366 367 368 /* documentation is in ftbitmap.h */ 369 370 FT_EXPORT_DEF( FT_Error ) FT_Bitmap_Convert(FT_Library library,const FT_Bitmap * source,FT_Bitmap * target,FT_Int alignment)371 FT_Bitmap_Convert( FT_Library library, 372 const FT_Bitmap *source, 373 FT_Bitmap *target, 374 FT_Int alignment ) 375 { 376 FT_Error error = FT_Err_Ok; 377 FT_Memory memory; 378 379 380 if ( !library ) 381 return FT_Err_Invalid_Library_Handle; 382 383 memory = library->memory; 384 385 switch ( source->pixel_mode ) 386 { 387 case FT_PIXEL_MODE_MONO: 388 case FT_PIXEL_MODE_GRAY: 389 case FT_PIXEL_MODE_GRAY2: 390 case FT_PIXEL_MODE_GRAY4: 391 case FT_PIXEL_MODE_LCD: 392 case FT_PIXEL_MODE_LCD_V: 393 { 394 FT_Int pad; 395 FT_Long old_size; 396 397 398 old_size = target->rows * target->pitch; 399 if ( old_size < 0 ) 400 old_size = -old_size; 401 402 target->pixel_mode = FT_PIXEL_MODE_GRAY; 403 target->rows = source->rows; 404 target->width = source->width; 405 406 pad = 0; 407 if ( alignment > 0 ) 408 { 409 pad = source->width % alignment; 410 if ( pad != 0 ) 411 pad = alignment - pad; 412 } 413 414 target->pitch = source->width + pad; 415 416 if ( target->rows * target->pitch > old_size && 417 FT_QREALLOC( target->buffer, 418 old_size, target->rows * target->pitch ) ) 419 return error; 420 } 421 break; 422 423 default: 424 error = FT_Err_Invalid_Argument; 425 } 426 427 switch ( source->pixel_mode ) 428 { 429 case FT_PIXEL_MODE_MONO: 430 { 431 FT_Byte* s = source->buffer; 432 FT_Byte* t = target->buffer; 433 FT_Int i; 434 435 436 target->num_grays = 2; 437 438 for ( i = source->rows; i > 0; i-- ) 439 { 440 FT_Byte* ss = s; 441 FT_Byte* tt = t; 442 FT_Int j; 443 444 445 /* get the full bytes */ 446 for ( j = source->width >> 3; j > 0; j-- ) 447 { 448 FT_Int val = ss[0]; /* avoid a byte->int cast on each line */ 449 450 451 tt[0] = (FT_Byte)( ( val & 0x80 ) >> 7 ); 452 tt[1] = (FT_Byte)( ( val & 0x40 ) >> 6 ); 453 tt[2] = (FT_Byte)( ( val & 0x20 ) >> 5 ); 454 tt[3] = (FT_Byte)( ( val & 0x10 ) >> 4 ); 455 tt[4] = (FT_Byte)( ( val & 0x08 ) >> 3 ); 456 tt[5] = (FT_Byte)( ( val & 0x04 ) >> 2 ); 457 tt[6] = (FT_Byte)( ( val & 0x02 ) >> 1 ); 458 tt[7] = (FT_Byte)( val & 0x01 ); 459 460 tt += 8; 461 ss += 1; 462 } 463 464 /* get remaining pixels (if any) */ 465 j = source->width & 7; 466 if ( j > 0 ) 467 { 468 FT_Int val = *ss; 469 470 471 for ( ; j > 0; j-- ) 472 { 473 tt[0] = (FT_Byte)( ( val & 0x80 ) >> 7); 474 val <<= 1; 475 tt += 1; 476 } 477 } 478 479 s += source->pitch; 480 t += target->pitch; 481 } 482 } 483 break; 484 485 486 case FT_PIXEL_MODE_GRAY: 487 case FT_PIXEL_MODE_LCD: 488 case FT_PIXEL_MODE_LCD_V: 489 { 490 FT_Int width = source->width; 491 FT_Byte* s = source->buffer; 492 FT_Byte* t = target->buffer; 493 FT_Int s_pitch = source->pitch; 494 FT_Int t_pitch = target->pitch; 495 FT_Int i; 496 497 498 target->num_grays = 256; 499 500 for ( i = source->rows; i > 0; i-- ) 501 { 502 FT_ARRAY_COPY( t, s, width ); 503 504 s += s_pitch; 505 t += t_pitch; 506 } 507 } 508 break; 509 510 511 case FT_PIXEL_MODE_GRAY2: 512 { 513 FT_Byte* s = source->buffer; 514 FT_Byte* t = target->buffer; 515 FT_Int i; 516 517 518 target->num_grays = 4; 519 520 for ( i = source->rows; i > 0; i-- ) 521 { 522 FT_Byte* ss = s; 523 FT_Byte* tt = t; 524 FT_Int j; 525 526 527 /* get the full bytes */ 528 for ( j = source->width >> 2; j > 0; j-- ) 529 { 530 FT_Int val = ss[0]; 531 532 533 tt[0] = (FT_Byte)( ( val & 0xC0 ) >> 6 ); 534 tt[1] = (FT_Byte)( ( val & 0x30 ) >> 4 ); 535 tt[2] = (FT_Byte)( ( val & 0x0C ) >> 2 ); 536 tt[3] = (FT_Byte)( ( val & 0x03 ) ); 537 538 ss += 1; 539 tt += 4; 540 } 541 542 j = source->width & 3; 543 if ( j > 0 ) 544 { 545 FT_Int val = ss[0]; 546 547 548 for ( ; j > 0; j-- ) 549 { 550 tt[0] = (FT_Byte)( ( val & 0xC0 ) >> 6 ); 551 val <<= 2; 552 tt += 1; 553 } 554 } 555 556 s += source->pitch; 557 t += target->pitch; 558 } 559 } 560 break; 561 562 563 case FT_PIXEL_MODE_GRAY4: 564 { 565 FT_Byte* s = source->buffer; 566 FT_Byte* t = target->buffer; 567 FT_Int i; 568 569 570 target->num_grays = 16; 571 572 for ( i = source->rows; i > 0; i-- ) 573 { 574 FT_Byte* ss = s; 575 FT_Byte* tt = t; 576 FT_Int j; 577 578 579 /* get the full bytes */ 580 for ( j = source->width >> 1; j > 0; j-- ) 581 { 582 FT_Int val = ss[0]; 583 584 585 tt[0] = (FT_Byte)( ( val & 0xF0 ) >> 4 ); 586 tt[1] = (FT_Byte)( ( val & 0x0F ) ); 587 588 ss += 1; 589 tt += 2; 590 } 591 592 if ( source->width & 1 ) 593 tt[0] = (FT_Byte)( ( ss[0] & 0xF0 ) >> 4 ); 594 595 s += source->pitch; 596 t += target->pitch; 597 } 598 } 599 break; 600 601 602 default: 603 ; 604 } 605 606 return error; 607 } 608 609 610 /* documentation is in ftbitmap.h */ 611 612 FT_EXPORT_DEF( FT_Error ) FT_GlyphSlot_Own_Bitmap(FT_GlyphSlot slot)613 FT_GlyphSlot_Own_Bitmap( FT_GlyphSlot slot ) 614 { 615 if ( slot && slot->format == FT_GLYPH_FORMAT_BITMAP && 616 !( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) ) 617 { 618 FT_Bitmap bitmap; 619 FT_Error error; 620 621 622 FT_Bitmap_New( &bitmap ); 623 error = FT_Bitmap_Copy( slot->library, &slot->bitmap, &bitmap ); 624 if ( error ) 625 return error; 626 627 slot->bitmap = bitmap; 628 slot->internal->flags |= FT_GLYPH_OWN_BITMAP; 629 } 630 631 return FT_Err_Ok; 632 } 633 634 635 /* documentation is in ftbitmap.h */ 636 637 FT_EXPORT_DEF( FT_Error ) FT_Bitmap_Done(FT_Library library,FT_Bitmap * bitmap)638 FT_Bitmap_Done( FT_Library library, 639 FT_Bitmap *bitmap ) 640 { 641 FT_Memory memory; 642 643 644 if ( !library ) 645 return FT_Err_Invalid_Library_Handle; 646 647 if ( !bitmap ) 648 return FT_Err_Invalid_Argument; 649 650 memory = library->memory; 651 652 FT_FREE( bitmap->buffer ); 653 *bitmap = null_bitmap; 654 655 return FT_Err_Ok; 656 } 657 658 659 /* END */ 660