1 /*****************************************************************************/ 2 // PNGTranslator 3 // Written by Michael Wilber, OBOS Translation Kit Team 4 // 5 // PNGTranslator.cpp 6 // 7 // This BTranslator based object is for opening and writing 8 // PNG images. 9 // 10 // 11 // Copyright (c) 2003, OpenBeOS Project 12 // Copyright (c) 2009, Haiku, Inc. All rights reserved. 13 // 14 // Permission is hereby granted, free of charge, to any person obtaining a 15 // copy of this software and associated documentation files (the "Software"), 16 // to deal in the Software without restriction, including without limitation 17 // the rights to use, copy, modify, merge, publish, distribute, sublicense, 18 // and/or sell copies of the Software, and to permit persons to whom the 19 // Software is furnished to do so, subject to the following conditions: 20 // 21 // The above copyright notice and this permission notice shall be included 22 // in all copies or substantial portions of the Software. 23 // 24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 25 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 29 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 30 // DEALINGS IN THE SOFTWARE. 31 /*****************************************************************************/ 32 33 34 #include "PNGTranslator.h" 35 36 #include <stdio.h> 37 #include <string.h> 38 39 #include <Catalog.h> 40 #include <OS.h> 41 #define PNG_NO_PEDANTIC_WARNINGS 42 #include <png.h> 43 44 #include "PNGView.h" 45 46 #undef B_TRANSLATION_CONTEXT 47 #define B_TRANSLATION_CONTEXT "PNGTranslator" 48 49 // The input formats that this translator supports. 50 static const translation_format sInputFormats[] = { 51 { 52 B_PNG_FORMAT, 53 B_TRANSLATOR_BITMAP, 54 PNG_IN_QUALITY, 55 PNG_IN_CAPABILITY, 56 "image/png", 57 "PNG image" 58 }, 59 { 60 B_PNG_FORMAT, 61 B_TRANSLATOR_BITMAP, 62 PNG_IN_QUALITY, 63 PNG_IN_CAPABILITY, 64 "image/x-png", 65 "PNG image" 66 }, 67 { 68 B_TRANSLATOR_BITMAP, 69 B_TRANSLATOR_BITMAP, 70 BBT_IN_QUALITY, 71 BBT_IN_CAPABILITY, 72 "image/x-be-bitmap", 73 "Be Bitmap Format (PNGTranslator)" 74 } 75 }; 76 77 // The output formats that this translator supports. 78 static const translation_format sOutputFormats[] = { 79 { 80 B_PNG_FORMAT, 81 B_TRANSLATOR_BITMAP, 82 PNG_OUT_QUALITY, 83 PNG_OUT_CAPABILITY, 84 "image/png", 85 "PNG image" 86 }, 87 { 88 B_TRANSLATOR_BITMAP, 89 B_TRANSLATOR_BITMAP, 90 BBT_OUT_QUALITY, 91 BBT_OUT_CAPABILITY, 92 "image/x-be-bitmap", 93 "Be Bitmap Format (PNGTranslator)" 94 } 95 }; 96 97 // Default settings for the Translator 98 static const TranSetting sDefaultSettings[] = { 99 {B_TRANSLATOR_EXT_HEADER_ONLY, TRAN_SETTING_BOOL, false}, 100 {B_TRANSLATOR_EXT_DATA_ONLY, TRAN_SETTING_BOOL, false}, 101 {PNG_SETTING_INTERLACE, TRAN_SETTING_INT32, PNG_INTERLACE_NONE} 102 // interlacing is off by default 103 }; 104 105 const uint32 kNumInputFormats = sizeof(sInputFormats) / sizeof(translation_format); 106 const uint32 kNumOutputFormats = sizeof(sOutputFormats) / sizeof(translation_format); 107 const uint32 kNumDefaultSettings = sizeof(sDefaultSettings) / sizeof(TranSetting); 108 109 110 // --------------------------------------------------------------- 111 // make_nth_translator 112 // 113 // Creates a PNGTranslator object to be used by BTranslatorRoster 114 // 115 // Preconditions: 116 // 117 // Parameters: n, The translator to return. Since 118 // PNGTranslator only publishes one 119 // translator, it only returns a 120 // PNGTranslator if n == 0 121 // 122 // you, The image_id of the add-on that 123 // contains code (not used). 124 // 125 // flags, Has no meaning yet, should be 0. 126 // 127 // Postconditions: 128 // 129 // Returns: NULL if n is not zero, 130 // a new PNGTranslator if n is zero 131 // --------------------------------------------------------------- 132 BTranslator * 133 make_nth_translator(int32 n, image_id you, uint32 flags, ...) 134 { 135 if (!n) 136 return new PNGTranslator(); 137 else 138 return NULL; 139 } 140 141 /* The png_jmpbuf() macro, used in error handling, became available in 142 * libpng version 1.0.6. If you want to be able to run your code with older 143 * versions of libpng, you must define the macro yourself (but only if it 144 * is not already defined by libpng!). 145 */ 146 147 #ifndef png_jmpbuf 148 # define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf) 149 #endif 150 151 //// libpng Callback functions! 152 153 BPositionIO * 154 get_pio(png_structp ppng) 155 { 156 BPositionIO *pio = NULL; 157 pio = static_cast<BPositionIO *>(png_get_io_ptr(ppng)); 158 return pio; 159 } 160 161 void 162 pngcb_read_data(png_structp ppng, png_bytep pdata, png_size_t length) 163 { 164 BPositionIO *pio = get_pio(ppng); 165 pio->Read(pdata, static_cast<size_t>(length)); 166 } 167 168 void 169 pngcb_write_data(png_structp ppng, png_bytep pdata, png_size_t length) 170 { 171 BPositionIO *pio = get_pio(ppng); 172 pio->Write(pdata, static_cast<size_t>(length)); 173 } 174 175 void 176 pngcb_flush_data(png_structp ppng) 177 { 178 // I don't think I really need to do anything here 179 } 180 181 // --------------------------------------------------------------- 182 // Constructor 183 // 184 // Sets up the version info and the name of the translator so that 185 // these values can be returned when they are requested. 186 // 187 // Preconditions: 188 // 189 // Parameters: 190 // 191 // Postconditions: 192 // 193 // Returns: 194 // --------------------------------------------------------------- 195 PNGTranslator::PNGTranslator() 196 : BaseTranslator(B_TRANSLATE("PNG images"), 197 B_TRANSLATE("PNG image translator"), 198 PNG_TRANSLATOR_VERSION, 199 sInputFormats, kNumInputFormats, 200 sOutputFormats, kNumOutputFormats, 201 "PNGTranslator_Settings", 202 sDefaultSettings, kNumDefaultSettings, 203 B_TRANSLATOR_BITMAP, B_PNG_FORMAT) 204 { 205 } 206 207 // --------------------------------------------------------------- 208 // Destructor 209 // 210 // Does nothing 211 // 212 // Preconditions: 213 // 214 // Parameters: 215 // 216 // Postconditions: 217 // 218 // Returns: 219 // --------------------------------------------------------------- 220 PNGTranslator::~PNGTranslator() 221 { 222 } 223 224 status_t 225 identify_png_header(BPositionIO *inSource, translator_info *outInfo) 226 { 227 const int32 kSigSize = 8; 228 uint8 buf[kSigSize]; 229 if (inSource->Read(buf, kSigSize) != kSigSize) 230 return B_NO_TRANSLATOR; 231 if (png_sig_cmp(buf, 0, kSigSize)) 232 // if first 8 bytes of stream don't match PNG signature bail 233 return B_NO_TRANSLATOR; 234 235 if (outInfo) { 236 outInfo->type = B_PNG_FORMAT; 237 outInfo->group = B_TRANSLATOR_BITMAP; 238 outInfo->quality = PNG_IN_QUALITY; 239 outInfo->capability = PNG_IN_CAPABILITY; 240 strcpy(outInfo->MIME, "image/png"); 241 strlcpy(outInfo->name, B_TRANSLATE("PNG image"), 242 sizeof(outInfo->name)); 243 } 244 245 return B_OK; 246 } 247 248 // --------------------------------------------------------------- 249 // DerivedIdentify 250 // 251 // Examines the data from inSource and determines if it is in a 252 // format that this translator knows how to work with. 253 // 254 // Preconditions: 255 // 256 // Parameters: inSource, where the data to examine is 257 // 258 // inFormat, a hint about the data in inSource, 259 // it is ignored since it is only a hint 260 // 261 // ioExtension, configuration settings for the 262 // translator (not used) 263 // 264 // outInfo, information about what data is in 265 // inSource and how well this translator 266 // can handle that data is stored here 267 // 268 // outType, The format that the user wants 269 // the data in inSource to be 270 // converted to 271 // 272 // Postconditions: 273 // 274 // Returns: B_NO_TRANSLATOR, if this translator can't handle 275 // the data in inSource 276 // 277 // B_ERROR, if there was an error converting the data to the host 278 // format 279 // 280 // B_BAD_VALUE, if the settings in ioExtension are bad 281 // 282 // B_OK, if this translator understood the data and there were 283 // no errors found 284 // 285 // Other errors if BPositionIO::Read() returned an error value 286 // --------------------------------------------------------------- 287 status_t 288 PNGTranslator::DerivedIdentify(BPositionIO *inSource, 289 const translation_format *inFormat, BMessage *ioExtension, 290 translator_info *outInfo, uint32 outType) 291 { 292 return identify_png_header(inSource, outInfo); 293 } 294 295 296 // Workaround for gcc2 complaining about clobbered variables when we do a 297 // setjmp, even though the variables are not accessed when returning from 298 // a longjmp. Moving setjmp to a different function is enough to hide the 299 // problem from gcc2. 300 static int 301 setjmp_wrapper(jmp_buf buf) 302 { 303 return setjmp(buf); 304 } 305 306 307 status_t 308 PNGTranslator::translate_from_png_to_bits(BPositionIO *inSource, 309 BPositionIO *outDestination) 310 { 311 if (identify_png_header(inSource, NULL) != B_OK) 312 return B_NO_TRANSLATOR; 313 314 status_t result = B_ERROR; 315 // if a libpng errors before this is set 316 // to a different value, the above is what 317 // will be returned from this function 318 319 bool bheaderonly = false, bdataonly = false; 320 321 // for storing decoded PNG row data 322 uint8 **prows = NULL, *prow = NULL; 323 png_uint_32 nalloc = 0; 324 325 png_structp ppng = NULL; 326 png_infop pinfo = NULL; 327 while (ppng == NULL) { 328 // create PNG read pointer with default error handling routines 329 ppng = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); 330 if (!ppng) 331 break; 332 // alocate / init memory for image information 333 pinfo = png_create_info_struct(ppng); 334 if (!pinfo) 335 break; 336 // set error handling 337 if (setjmp_wrapper(png_jmpbuf(ppng))) 338 // When an error occurs in libpng, it uses 339 // the longjmp function to continue execution 340 // from this point 341 break; 342 343 // set read callback function 344 png_set_read_fn(ppng, static_cast<void *>(inSource), pngcb_read_data); 345 346 // Read in PNG image info 347 png_set_sig_bytes(ppng, 8); 348 png_read_info(ppng, pinfo); 349 350 png_uint_32 width, height; 351 int bit_depth, color_type, interlace_type; 352 png_get_IHDR(ppng, pinfo, &width, &height, &bit_depth, &color_type, 353 &interlace_type, NULL, NULL); 354 355 // Setup image transformations to make converting it easier 356 bool balpha = false; 357 358 if (bit_depth == 16) 359 png_set_strip_16(ppng); 360 else if (bit_depth < 8) 361 png_set_packing(ppng); 362 363 if (color_type == PNG_COLOR_TYPE_PALETTE) 364 png_set_palette_to_rgb(ppng); 365 366 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) 367 // In order to convert from low-depth gray images to RGB, 368 // I first need to convert them to grayscale, 8 bpp 369 png_set_expand_gray_1_2_4_to_8(ppng); 370 371 if (png_get_valid(ppng, pinfo, PNG_INFO_tRNS)) { 372 // if there is transparency data in the 373 // PNG, but not in the form of an alpha channel 374 balpha = true; 375 png_set_tRNS_to_alpha(ppng); 376 } 377 378 // change RGB to BGR as it is in 'bits' 379 if (color_type & PNG_COLOR_MASK_COLOR) 380 png_set_bgr(ppng); 381 382 // have libpng convert gray to RGB for me 383 if (color_type == PNG_COLOR_TYPE_GRAY || 384 color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 385 png_set_gray_to_rgb(ppng); 386 387 if (color_type & PNG_COLOR_MASK_ALPHA) 388 // if image contains an alpha channel 389 balpha = true; 390 391 if (!balpha) 392 // add filler byte for images without alpha 393 // so that the pixels are 4 bytes each 394 png_set_filler(ppng, 0xff, PNG_FILLER_AFTER); 395 396 // Check that transformed PNG rowbytes matches 397 // what is expected 398 const int32 kbytes = 4; 399 png_uint_32 rowbytes = png_get_rowbytes(ppng, pinfo); 400 if (rowbytes < kbytes * width) 401 rowbytes = kbytes * width; 402 403 if (!bdataonly) { 404 // Write out the data to outDestination 405 // Construct and write Be bitmap header 406 TranslatorBitmap bitsHeader; 407 bitsHeader.magic = B_TRANSLATOR_BITMAP; 408 bitsHeader.bounds.left = 0; 409 bitsHeader.bounds.top = 0; 410 bitsHeader.bounds.right = width - 1; 411 bitsHeader.bounds.bottom = height - 1; 412 bitsHeader.rowBytes = 4 * width; 413 if (balpha) 414 bitsHeader.colors = B_RGBA32; 415 else 416 bitsHeader.colors = B_RGB32; 417 bitsHeader.dataSize = bitsHeader.rowBytes * height; 418 if (swap_data(B_UINT32_TYPE, &bitsHeader, 419 sizeof(TranslatorBitmap), B_SWAP_HOST_TO_BENDIAN) != B_OK) { 420 result = B_ERROR; 421 break; 422 } 423 outDestination->Write(&bitsHeader, sizeof(TranslatorBitmap)); 424 425 if (bheaderonly) { 426 result = B_OK; 427 break; 428 } 429 } 430 431 if (interlace_type == PNG_INTERLACE_NONE) { 432 // allocate buffer for storing PNG row 433 prow = new uint8[rowbytes]; 434 if (!prow) { 435 result = B_NO_MEMORY; 436 break; 437 } 438 for (png_uint_32 i = 0; i < height; i++) { 439 png_read_row(ppng, prow, NULL); 440 outDestination->Write(prow, width * kbytes); 441 } 442 result = B_OK; 443 // Set OK status here, because, in the event of 444 // an error, png_read_end() will longjmp to error 445 // handler above and not execute lines below it 446 447 // finish reading, pass NULL for info because I 448 // don't need the extra data 449 png_read_end(ppng, NULL); 450 451 break; 452 453 } else { 454 // interlaced PNG image 455 prows = new uint8 *[height]; 456 if (!prows) { 457 result = B_NO_MEMORY; 458 break; 459 } 460 // allocate enough memory to store the whole image 461 for (nalloc = 0; nalloc < height; nalloc++) { 462 prows[nalloc] = new uint8[rowbytes]; 463 if (!prows[nalloc]) 464 break; 465 } 466 467 if (nalloc < height) 468 result = B_NO_MEMORY; 469 else { 470 png_read_image(ppng, prows); 471 472 for (png_uint_32 i = 0; i < height; i++) 473 outDestination->Write(prows[i], width * kbytes); 474 result = B_OK; 475 // Set OK status here, because, in the event of 476 // an error, png_read_end() will longjmp to error 477 // handler above and not execute lines below it 478 479 png_read_end(ppng, NULL); 480 } 481 482 break; 483 } 484 } 485 486 if (ppng) { 487 delete[] prow; 488 prow = NULL; 489 490 // delete row pointers and array of pointers to rows 491 while (nalloc) { 492 nalloc--; 493 delete[] prows[nalloc]; 494 } 495 delete[] prows; 496 prows = NULL; 497 498 // free PNG handle / info structures 499 if (!pinfo) 500 png_destroy_read_struct(&ppng, NULL, NULL); 501 else 502 png_destroy_read_struct(&ppng, &pinfo, NULL); 503 } 504 505 return result; 506 } 507 508 status_t 509 PNGTranslator::translate_from_png(BPositionIO *inSource, uint32 outType, 510 BPositionIO *outDestination) 511 { 512 if (outType == B_TRANSLATOR_BITMAP) 513 return translate_from_png_to_bits(inSource, outDestination); 514 else { 515 // Translate from PNG to PNG 516 translate_direct_copy(inSource, outDestination); 517 return B_OK; 518 } 519 } 520 521 // Convert width pixels from pbits to PNG format, storing the 522 // result in ppng 523 status_t 524 pix_bits_to_png(uint8 *pbits, uint8 *ppng, color_space fromspace, 525 uint32 width, const color_map *pmap, int32 bitsBytesPerPixel) 526 { 527 status_t bytescopied = 0; 528 uint16 val; 529 530 switch (fromspace) { 531 case B_RGBA32: 532 bytescopied = width * bitsBytesPerPixel; 533 memcpy(ppng, pbits, bytescopied); 534 break; 535 536 case B_RGB32: 537 case B_RGB24: 538 bytescopied = width * bitsBytesPerPixel; 539 while (width--) { 540 memcpy(ppng, pbits, 3); 541 ppng += 3; 542 pbits += bitsBytesPerPixel; 543 } 544 break; 545 546 case B_RGBA32_BIG: 547 bytescopied = width * 4; 548 while (width--) { 549 ppng[0] = pbits[3]; 550 ppng[1] = pbits[2]; 551 ppng[2] = pbits[1]; 552 ppng[3] = pbits[0]; 553 554 ppng += 4; 555 pbits += 4; 556 } 557 break; 558 559 case B_CMYA32: 560 bytescopied = width * 4; 561 while (width--) { 562 ppng[0] = 255 - pbits[2]; 563 ppng[1] = 255 - pbits[1]; 564 ppng[2] = 255 - pbits[0]; 565 ppng[3] = pbits[3]; 566 567 ppng += 4; 568 pbits += 4; 569 } 570 break; 571 572 case B_CMYK32: 573 { 574 int32 comp; 575 bytescopied = width * 3; 576 while (width--) { 577 comp = 255 - pbits[2] - pbits[3]; 578 ppng[0] = (comp < 0) ? 0 : comp; 579 580 comp = 255 - pbits[1] - pbits[3]; 581 ppng[1] = (comp < 0) ? 0 : comp; 582 583 comp = 255 - pbits[0] - pbits[3]; 584 ppng[2] = (comp < 0) ? 0 : comp; 585 586 ppng += 3; 587 pbits += 4; 588 } 589 break; 590 } 591 592 case B_CMY32: 593 case B_CMY24: 594 bytescopied = width * 3; 595 while (width--) { 596 ppng[0] = 255 - pbits[2]; 597 ppng[1] = 255 - pbits[1]; 598 ppng[2] = 255 - pbits[0]; 599 600 ppng += 3; 601 pbits += bitsBytesPerPixel; 602 } 603 break; 604 605 case B_RGB16: 606 case B_RGB16_BIG: 607 bytescopied = width * 3; 608 while (width--) { 609 if (fromspace == B_RGB16) 610 val = pbits[0] + (pbits[1] << 8); 611 else 612 val = pbits[1] + (pbits[0] << 8); 613 614 ppng[0] = 615 ((val & 0x1f) << 3) | ((val & 0x1f) >> 2); 616 ppng[1] = 617 ((val & 0x7e0) >> 3) | ((val & 0x7e0) >> 9); 618 ppng[2] = 619 ((val & 0xf800) >> 8) | ((val & 0xf800) >> 13); 620 621 ppng += 3; 622 pbits += 2; 623 } 624 break; 625 626 case B_RGB15: 627 case B_RGB15_BIG: 628 bytescopied = width * 3; 629 while (width--) { 630 if (fromspace == B_RGB15) 631 val = pbits[0] + (pbits[1] << 8); 632 else 633 val = pbits[1] + (pbits[0] << 8); 634 ppng[0] = 635 ((val & 0x1f) << 3) | ((val & 0x1f) >> 2); 636 ppng[1] = 637 ((val & 0x3e0) >> 2) | ((val & 0x3e0) >> 7); 638 ppng[2] = 639 ((val & 0x7c00) >> 7) | ((val & 0x7c00) >> 12); 640 641 ppng += 3; 642 pbits += 2; 643 } 644 break; 645 646 case B_RGBA15: 647 case B_RGBA15_BIG: 648 bytescopied = width * 4; 649 while (width--) { 650 if (fromspace == B_RGBA15) 651 val = pbits[0] + (pbits[1] << 8); 652 else 653 val = pbits[1] + (pbits[0] << 8); 654 ppng[0] = 655 ((val & 0x1f) << 3) | ((val & 0x1f) >> 2); 656 ppng[1] = 657 ((val & 0x3e0) >> 2) | ((val & 0x3e0) >> 7); 658 ppng[2] = 659 ((val & 0x7c00) >> 7) | ((val & 0x7c00) >> 12); 660 ppng[3] = (val & 0x8000) ? 255 : 0; 661 662 ppng += 4; 663 pbits += 2; 664 } 665 break; 666 667 case B_RGB32_BIG: 668 bytescopied = width * 3; 669 while (width--) { 670 ppng[0] = pbits[3]; 671 ppng[1] = pbits[2]; 672 ppng[2] = pbits[1]; 673 674 ppng += 3; 675 pbits += 4; 676 } 677 break; 678 679 case B_RGB24_BIG: 680 bytescopied = width * 3; 681 while (width--) { 682 ppng[0] = pbits[2]; 683 ppng[1] = pbits[1]; 684 ppng[2] = pbits[0]; 685 686 ppng += 3; 687 pbits += 3; 688 } 689 break; 690 691 case B_CMAP8: 692 { 693 rgb_color c; 694 bytescopied = width * 3; 695 while (width--) { 696 c = pmap->color_list[pbits[0]]; 697 ppng[0] = c.blue; 698 ppng[1] = c.green; 699 ppng[2] = c.red; 700 701 ppng += 3; 702 pbits++; 703 } 704 break; 705 } 706 707 case B_GRAY8: 708 bytescopied = width; 709 memcpy(ppng, pbits, bytescopied); 710 break; 711 712 default: 713 bytescopied = B_ERROR; 714 break; 715 } // switch (fromspace) 716 717 return bytescopied; 718 } 719 720 status_t 721 PNGTranslator::translate_from_bits_to_png(BPositionIO *inSource, 722 BPositionIO *outDestination) 723 { 724 TranslatorBitmap bitsHeader; 725 726 status_t result; 727 728 result = identify_bits_header(inSource, NULL, &bitsHeader); 729 if (result != B_OK) 730 return result; 731 732 const color_map *pmap = NULL; 733 if (bitsHeader.colors == B_CMAP8) { 734 pmap = system_colors(); 735 if (!pmap) 736 return B_ERROR; 737 } 738 739 png_uint_32 width, height; 740 width = static_cast<png_uint_32>(bitsHeader.bounds.Width() + 1); 741 height = static_cast<png_uint_32>(bitsHeader.bounds.Height() + 1); 742 743 int32 pngBytesPerPixel = 0; 744 int bit_depth, color_type, interlace_type; 745 bit_depth = 8; 746 switch (bitsHeader.colors) { 747 case B_RGBA32: 748 case B_RGBA32_BIG: 749 case B_CMYA32: 750 case B_RGBA15: 751 case B_RGBA15_BIG: 752 pngBytesPerPixel = 4; 753 color_type = PNG_COLOR_TYPE_RGB_ALPHA; 754 break; 755 756 case B_RGB32: 757 case B_RGB32_BIG: 758 case B_RGB24: 759 case B_RGB24_BIG: 760 case B_CMY32: 761 case B_CMYK32: 762 case B_CMY24: 763 case B_RGB16: 764 case B_RGB16_BIG: 765 case B_RGB15: 766 case B_RGB15_BIG: 767 pngBytesPerPixel = 3; 768 color_type = PNG_COLOR_TYPE_RGB; 769 break; 770 771 // ADD SUPPORT FOR B_CMAP8 HERE (later) 772 773 case B_GRAY8: 774 pngBytesPerPixel = 1; 775 color_type = PNG_COLOR_TYPE_GRAY; 776 break; 777 778 default: 779 return B_NO_TRANSLATOR; 780 } 781 interlace_type = fSettings->SetGetInt32(PNG_SETTING_INTERLACE); 782 783 int32 bitsBytesPerPixel = 0; 784 switch (bitsHeader.colors) { 785 case B_RGBA32: 786 case B_RGBA32_BIG: 787 case B_RGB32: 788 case B_RGB32_BIG: 789 case B_CMYA32: 790 case B_CMYK32: 791 case B_CMY32: 792 bitsBytesPerPixel = 4; 793 break; 794 795 case B_RGB24: 796 case B_RGB24_BIG: 797 case B_CMY24: 798 bitsBytesPerPixel = 3; 799 break; 800 801 case B_RGB16: 802 case B_RGB16_BIG: 803 case B_RGBA15: 804 case B_RGBA15_BIG: 805 case B_RGB15: 806 case B_RGB15_BIG: 807 bitsBytesPerPixel = 2; 808 break; 809 810 case B_GRAY8: 811 case B_CMAP8: 812 bitsBytesPerPixel = 1; 813 break; 814 815 default: 816 return B_NO_TRANSLATOR; 817 }; 818 819 uint8 *pbitsrow = NULL, *prow = NULL; 820 // row buffers 821 // image buffer for writing whole png image at once 822 uint8 **prows = NULL; 823 png_uint_32 nalloc = 0; 824 825 png_structp ppng = NULL; 826 png_infop pinfo = NULL; 827 828 result = B_NO_TRANSLATOR; 829 while (ppng == NULL) { 830 // create PNG read pointer with default error handling routines 831 ppng = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, 832 NULL, NULL); 833 if (!ppng) { 834 result = B_ERROR; 835 break; 836 } 837 // alocate / init memory for image information 838 pinfo = png_create_info_struct(ppng); 839 if (!pinfo) { 840 result = B_ERROR; 841 break; 842 } 843 // set error handling 844 if (setjmp_wrapper(png_jmpbuf(ppng))) { 845 // When an error occurs in libpng, it uses 846 // the longjmp function to continue execution 847 // from this point 848 result = B_ERROR; 849 break; 850 } 851 852 png_set_write_fn(ppng, static_cast<void *>(outDestination), 853 pngcb_write_data, pngcb_flush_data); 854 855 // Allocate memory needed to buffer image data 856 pbitsrow = new uint8[bitsHeader.rowBytes]; 857 if (!pbitsrow) { 858 result = B_NO_MEMORY; 859 break; 860 } 861 if (interlace_type == PNG_INTERLACE_NONE) { 862 prow = new uint8[width * pngBytesPerPixel]; 863 if (!prow) { 864 result = B_NO_MEMORY; 865 break; 866 } 867 } else { 868 prows = new uint8 *[height]; 869 if (!prows) { 870 result = B_NO_MEMORY; 871 break; 872 } 873 // allocate enough memory to store the whole image 874 for (nalloc = 0; nalloc < height; nalloc++) { 875 prows[nalloc] = new uint8[width * pngBytesPerPixel]; 876 if (!prows[nalloc]) 877 break; 878 } 879 if (nalloc < height) { 880 result = B_NO_MEMORY; 881 // clear out rest of the pointers, 882 // so we don't call delete[] with invalid pointers 883 for (; nalloc < height; nalloc++) 884 prows[nalloc] = NULL; 885 break; 886 } 887 } 888 889 // Specify image info 890 png_set_IHDR(ppng, pinfo, width, height, bit_depth, color_type, 891 interlace_type, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); 892 png_write_info(ppng, pinfo); 893 894 png_set_bgr(ppng); 895 896 // write out image data 897 if (interlace_type == PNG_INTERLACE_NONE) { 898 for (png_uint_32 i = 0; i < height; i++) { 899 inSource->Read(pbitsrow, bitsHeader.rowBytes); 900 901 pix_bits_to_png(pbitsrow, prow, bitsHeader.colors, width, 902 pmap, bitsBytesPerPixel); 903 904 png_write_row(ppng, prow); 905 } 906 } else { 907 for (png_uint_32 i = 0; i < height; i++) { 908 inSource->Read(pbitsrow, bitsHeader.rowBytes); 909 910 pix_bits_to_png(pbitsrow, prows[i], bitsHeader.colors, width, 911 pmap, bitsBytesPerPixel); 912 } 913 png_write_image(ppng, prows); 914 } 915 png_write_end(ppng, NULL); 916 917 result = B_OK; 918 break; 919 } 920 921 if (ppng) { 922 delete[] pbitsrow; 923 pbitsrow = NULL; 924 925 delete[] prow; 926 prow = NULL; 927 928 // delete row pointers and array of pointers to rows 929 while (nalloc) { 930 nalloc--; 931 delete[] prows[nalloc]; 932 } 933 delete[] prows; 934 prows = NULL; 935 936 // free PNG handle / info structures 937 if (!pinfo) 938 png_destroy_write_struct(&ppng, NULL); 939 else 940 png_destroy_write_struct(&ppng, &pinfo); 941 } 942 943 return result; 944 } 945 946 // --------------------------------------------------------------- 947 // DerivedTranslate 948 // 949 // Translates the data in inSource to the type outType and stores 950 // the translated data in outDestination. 951 // 952 // Preconditions: 953 // 954 // Parameters: inSource, the data to be translated 955 // 956 // inInfo, hint about the data in inSource (not used) 957 // 958 // ioExtension, configuration options for the 959 // translator 960 // 961 // outType, the type to convert inSource to 962 // 963 // outDestination, where the translated data is 964 // put 965 // 966 // baseType, indicates whether inSource is in the 967 // bits format, not in the bits format or 968 // is unknown 969 // 970 // Postconditions: 971 // 972 // Returns: B_BAD_VALUE, if the options in ioExtension are bad 973 // 974 // B_NO_TRANSLATOR, if this translator doesn't understand the data 975 // 976 // B_ERROR, if there was an error allocating memory or converting 977 // data 978 // 979 // B_OK, if all went well 980 // --------------------------------------------------------------- 981 status_t 982 PNGTranslator::DerivedTranslate(BPositionIO *inSource, 983 const translator_info *inInfo, BMessage *ioExtension, uint32 outType, 984 BPositionIO *outDestination, int32 baseType) 985 { 986 if (baseType == 1) 987 // if inSource is in bits format 988 return translate_from_bits_to_png(inSource, outDestination); 989 else if (baseType == 0) 990 // if inSource is NOT in bits format 991 return translate_from_png(inSource, outType, outDestination); 992 else 993 return B_NO_TRANSLATOR; 994 } 995 996 BView * 997 PNGTranslator::NewConfigView(TranslatorSettings *settings) 998 { 999 return new PNGView(BRect(0, 0, PNG_VIEW_WIDTH, PNG_VIEW_HEIGHT), 1000 B_TRANSLATE("PNGTranslator Settings"), B_FOLLOW_ALL, 1001 B_WILL_DRAW, settings); 1002 } 1003 1004