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 void throw_error(png_structp ppng, png_const_charp error_msg) 296 { 297 throw std::exception(); 298 } 299 300 void alert_warning(png_structp ppng, png_const_charp error_msg) 301 { 302 // Ignore 303 // TODO show a BAlert? 304 } 305 306 status_t 307 PNGTranslator::translate_from_png_to_bits(BPositionIO *inSource, 308 BPositionIO *outDestination) 309 { 310 if (identify_png_header(inSource, NULL) != B_OK) 311 return B_NO_TRANSLATOR; 312 313 status_t result = B_ERROR; 314 // if a libpng errors before this is set 315 // to a different value, the above is what 316 // will be returned from this function 317 318 bool bheaderonly = false, bdataonly = false; 319 320 // for storing decoded PNG row data 321 uint8 **prows = NULL, *prow = NULL; 322 png_uint_32 nalloc = 0; 323 324 png_structp ppng = NULL; 325 png_infop pinfo = NULL; 326 while (ppng == NULL) { 327 // create PNG read pointer with default error handling routines 328 ppng = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); 329 if (!ppng) 330 break; 331 332 // alocate / init memory for image information 333 pinfo = png_create_info_struct(ppng); 334 if (!pinfo) 335 break; 336 337 // set up erorr handling to use C++ exceptions instead of setjmp 338 png_set_error_fn(ppng, png_get_error_ptr(ppng), throw_error, 339 alert_warning); 340 341 try { 342 // set read callback function 343 png_set_read_fn(ppng, static_cast<void *>(inSource), pngcb_read_data); 344 345 // Read in PNG image info 346 png_set_sig_bytes(ppng, 8); 347 png_read_info(ppng, pinfo); 348 349 png_uint_32 width, height; 350 int bit_depth, color_type, interlace_type; 351 png_get_IHDR(ppng, pinfo, &width, &height, &bit_depth, &color_type, 352 &interlace_type, NULL, NULL); 353 354 // Setup image transformations to make converting it easier 355 bool balpha = false; 356 357 if (bit_depth == 16) 358 png_set_strip_16(ppng); 359 else if (bit_depth < 8) 360 png_set_packing(ppng); 361 362 if (color_type == PNG_COLOR_TYPE_PALETTE) 363 png_set_palette_to_rgb(ppng); 364 365 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) { 366 // In order to convert from low-depth gray images to RGB, 367 // I first need to convert them to grayscale, 8 bpp 368 png_set_expand_gray_1_2_4_to_8(ppng); 369 } 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 } 387 388 if (color_type & PNG_COLOR_MASK_ALPHA) { 389 // if image contains an alpha channel 390 balpha = true; 391 } 392 393 if (!balpha) { 394 // add filler byte for images without alpha 395 // so that the pixels are 4 bytes each 396 png_set_filler(ppng, 0xff, PNG_FILLER_AFTER); 397 } 398 399 // Check that transformed PNG rowbytes matches 400 // what is expected 401 const int32 kbytes = 4; 402 png_uint_32 rowbytes = png_get_rowbytes(ppng, pinfo); 403 if (rowbytes < kbytes * width) 404 rowbytes = kbytes * width; 405 406 if (!bdataonly) { 407 // Write out the data to outDestination 408 // Construct and write Be bitmap header 409 TranslatorBitmap bitsHeader; 410 bitsHeader.magic = B_TRANSLATOR_BITMAP; 411 bitsHeader.bounds.left = 0; 412 bitsHeader.bounds.top = 0; 413 bitsHeader.bounds.right = width - 1; 414 bitsHeader.bounds.bottom = height - 1; 415 bitsHeader.rowBytes = 4 * width; 416 if (balpha) 417 bitsHeader.colors = B_RGBA32; 418 else 419 bitsHeader.colors = B_RGB32; 420 bitsHeader.dataSize = bitsHeader.rowBytes * height; 421 if (swap_data(B_UINT32_TYPE, &bitsHeader, 422 sizeof(TranslatorBitmap), B_SWAP_HOST_TO_BENDIAN) != B_OK) { 423 result = B_ERROR; 424 break; 425 } 426 outDestination->Write(&bitsHeader, sizeof(TranslatorBitmap)); 427 428 if (bheaderonly) { 429 result = B_OK; 430 break; 431 } 432 } 433 434 if (interlace_type == PNG_INTERLACE_NONE) { 435 // allocate buffer for storing PNG row 436 prow = new uint8[rowbytes]; 437 if (!prow) { 438 result = B_NO_MEMORY; 439 break; 440 } 441 for (png_uint_32 i = 0; i < height; i++) { 442 png_read_row(ppng, prow, NULL); 443 outDestination->Write(prow, width * kbytes); 444 } 445 446 // finish reading, pass NULL for info because I 447 // don't need the extra data 448 png_read_end(ppng, NULL); 449 result = B_OK; 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); 474 475 result = B_OK; 476 // If png_read_end throws an exception, we still accept 477 // the image as valid. 478 png_read_end(ppng, NULL); 479 } 480 481 break; 482 } 483 } catch (std::exception& e) { 484 // An error occured, abort decoding and cleanup 485 break; 486 } 487 } 488 489 if (ppng) { 490 delete[] prow; 491 prow = NULL; 492 493 // delete row pointers and array of pointers to rows 494 while (nalloc) { 495 nalloc--; 496 delete[] prows[nalloc]; 497 } 498 delete[] prows; 499 prows = NULL; 500 501 // free PNG handle / info structures 502 if (!pinfo) 503 png_destroy_read_struct(&ppng, NULL, NULL); 504 else 505 png_destroy_read_struct(&ppng, &pinfo, NULL); 506 } 507 508 return result; 509 } 510 511 status_t 512 PNGTranslator::translate_from_png(BPositionIO *inSource, uint32 outType, 513 BPositionIO *outDestination) 514 { 515 if (outType == B_TRANSLATOR_BITMAP) 516 return translate_from_png_to_bits(inSource, outDestination); 517 else { 518 // Translate from PNG to PNG 519 translate_direct_copy(inSource, outDestination); 520 return B_OK; 521 } 522 } 523 524 // Convert width pixels from pbits to PNG format, storing the 525 // result in ppng 526 status_t 527 pix_bits_to_png(uint8 *pbits, uint8 *ppng, color_space fromspace, 528 uint32 width, const color_map *pmap, int32 bitsBytesPerPixel) 529 { 530 status_t bytescopied = 0; 531 uint16 val; 532 533 switch (fromspace) { 534 case B_RGBA32: 535 bytescopied = width * bitsBytesPerPixel; 536 memcpy(ppng, pbits, bytescopied); 537 break; 538 539 case B_RGB32: 540 case B_RGB24: 541 bytescopied = width * bitsBytesPerPixel; 542 while (width--) { 543 memcpy(ppng, pbits, 3); 544 ppng += 3; 545 pbits += bitsBytesPerPixel; 546 } 547 break; 548 549 case B_RGBA32_BIG: 550 bytescopied = width * 4; 551 while (width--) { 552 ppng[0] = pbits[3]; 553 ppng[1] = pbits[2]; 554 ppng[2] = pbits[1]; 555 ppng[3] = pbits[0]; 556 557 ppng += 4; 558 pbits += 4; 559 } 560 break; 561 562 case B_CMYA32: 563 bytescopied = width * 4; 564 while (width--) { 565 ppng[0] = 255 - pbits[2]; 566 ppng[1] = 255 - pbits[1]; 567 ppng[2] = 255 - pbits[0]; 568 ppng[3] = pbits[3]; 569 570 ppng += 4; 571 pbits += 4; 572 } 573 break; 574 575 case B_CMYK32: 576 { 577 int32 comp; 578 bytescopied = width * 3; 579 while (width--) { 580 comp = 255 - pbits[2] - pbits[3]; 581 ppng[0] = (comp < 0) ? 0 : comp; 582 583 comp = 255 - pbits[1] - pbits[3]; 584 ppng[1] = (comp < 0) ? 0 : comp; 585 586 comp = 255 - pbits[0] - pbits[3]; 587 ppng[2] = (comp < 0) ? 0 : comp; 588 589 ppng += 3; 590 pbits += 4; 591 } 592 break; 593 } 594 595 case B_CMY32: 596 case B_CMY24: 597 bytescopied = width * 3; 598 while (width--) { 599 ppng[0] = 255 - pbits[2]; 600 ppng[1] = 255 - pbits[1]; 601 ppng[2] = 255 - pbits[0]; 602 603 ppng += 3; 604 pbits += bitsBytesPerPixel; 605 } 606 break; 607 608 case B_RGB16: 609 case B_RGB16_BIG: 610 bytescopied = width * 3; 611 while (width--) { 612 if (fromspace == B_RGB16) 613 val = pbits[0] + (pbits[1] << 8); 614 else 615 val = pbits[1] + (pbits[0] << 8); 616 617 ppng[0] = 618 ((val & 0x1f) << 3) | ((val & 0x1f) >> 2); 619 ppng[1] = 620 ((val & 0x7e0) >> 3) | ((val & 0x7e0) >> 9); 621 ppng[2] = 622 ((val & 0xf800) >> 8) | ((val & 0xf800) >> 13); 623 624 ppng += 3; 625 pbits += 2; 626 } 627 break; 628 629 case B_RGB15: 630 case B_RGB15_BIG: 631 bytescopied = width * 3; 632 while (width--) { 633 if (fromspace == B_RGB15) 634 val = pbits[0] + (pbits[1] << 8); 635 else 636 val = pbits[1] + (pbits[0] << 8); 637 ppng[0] = 638 ((val & 0x1f) << 3) | ((val & 0x1f) >> 2); 639 ppng[1] = 640 ((val & 0x3e0) >> 2) | ((val & 0x3e0) >> 7); 641 ppng[2] = 642 ((val & 0x7c00) >> 7) | ((val & 0x7c00) >> 12); 643 644 ppng += 3; 645 pbits += 2; 646 } 647 break; 648 649 case B_RGBA15: 650 case B_RGBA15_BIG: 651 bytescopied = width * 4; 652 while (width--) { 653 if (fromspace == B_RGBA15) 654 val = pbits[0] + (pbits[1] << 8); 655 else 656 val = pbits[1] + (pbits[0] << 8); 657 ppng[0] = 658 ((val & 0x1f) << 3) | ((val & 0x1f) >> 2); 659 ppng[1] = 660 ((val & 0x3e0) >> 2) | ((val & 0x3e0) >> 7); 661 ppng[2] = 662 ((val & 0x7c00) >> 7) | ((val & 0x7c00) >> 12); 663 ppng[3] = (val & 0x8000) ? 255 : 0; 664 665 ppng += 4; 666 pbits += 2; 667 } 668 break; 669 670 case B_RGB32_BIG: 671 bytescopied = width * 3; 672 while (width--) { 673 ppng[0] = pbits[3]; 674 ppng[1] = pbits[2]; 675 ppng[2] = pbits[1]; 676 677 ppng += 3; 678 pbits += 4; 679 } 680 break; 681 682 case B_RGB24_BIG: 683 bytescopied = width * 3; 684 while (width--) { 685 ppng[0] = pbits[2]; 686 ppng[1] = pbits[1]; 687 ppng[2] = pbits[0]; 688 689 ppng += 3; 690 pbits += 3; 691 } 692 break; 693 694 case B_CMAP8: 695 { 696 rgb_color c; 697 bytescopied = width * 3; 698 while (width--) { 699 c = pmap->color_list[pbits[0]]; 700 ppng[0] = c.blue; 701 ppng[1] = c.green; 702 ppng[2] = c.red; 703 704 ppng += 3; 705 pbits++; 706 } 707 break; 708 } 709 710 case B_GRAY8: 711 bytescopied = width; 712 memcpy(ppng, pbits, bytescopied); 713 break; 714 715 default: 716 bytescopied = B_ERROR; 717 break; 718 } // switch (fromspace) 719 720 return bytescopied; 721 } 722 723 status_t 724 PNGTranslator::translate_from_bits_to_png(BPositionIO *inSource, 725 BPositionIO *outDestination) 726 { 727 TranslatorBitmap bitsHeader; 728 729 status_t result; 730 731 result = identify_bits_header(inSource, NULL, &bitsHeader); 732 if (result != B_OK) 733 return result; 734 735 const color_map *pmap = NULL; 736 if (bitsHeader.colors == B_CMAP8) { 737 pmap = system_colors(); 738 if (!pmap) 739 return B_ERROR; 740 } 741 742 png_uint_32 width, height; 743 width = static_cast<png_uint_32>(bitsHeader.bounds.Width() + 1); 744 height = static_cast<png_uint_32>(bitsHeader.bounds.Height() + 1); 745 746 int32 pngBytesPerPixel = 0; 747 int bit_depth, color_type, interlace_type; 748 bit_depth = 8; 749 switch (bitsHeader.colors) { 750 case B_RGBA32: 751 case B_RGBA32_BIG: 752 case B_CMYA32: 753 case B_RGBA15: 754 case B_RGBA15_BIG: 755 pngBytesPerPixel = 4; 756 color_type = PNG_COLOR_TYPE_RGB_ALPHA; 757 break; 758 759 case B_RGB32: 760 case B_RGB32_BIG: 761 case B_RGB24: 762 case B_RGB24_BIG: 763 case B_CMY32: 764 case B_CMYK32: 765 case B_CMY24: 766 case B_RGB16: 767 case B_RGB16_BIG: 768 case B_RGB15: 769 case B_RGB15_BIG: 770 pngBytesPerPixel = 3; 771 color_type = PNG_COLOR_TYPE_RGB; 772 break; 773 774 // ADD SUPPORT FOR B_CMAP8 HERE (later) 775 776 case B_GRAY8: 777 pngBytesPerPixel = 1; 778 color_type = PNG_COLOR_TYPE_GRAY; 779 break; 780 781 default: 782 return B_NO_TRANSLATOR; 783 } 784 interlace_type = fSettings->SetGetInt32(PNG_SETTING_INTERLACE); 785 786 int32 bitsBytesPerPixel = 0; 787 switch (bitsHeader.colors) { 788 case B_RGBA32: 789 case B_RGBA32_BIG: 790 case B_RGB32: 791 case B_RGB32_BIG: 792 case B_CMYA32: 793 case B_CMYK32: 794 case B_CMY32: 795 bitsBytesPerPixel = 4; 796 break; 797 798 case B_RGB24: 799 case B_RGB24_BIG: 800 case B_CMY24: 801 bitsBytesPerPixel = 3; 802 break; 803 804 case B_RGB16: 805 case B_RGB16_BIG: 806 case B_RGBA15: 807 case B_RGBA15_BIG: 808 case B_RGB15: 809 case B_RGB15_BIG: 810 bitsBytesPerPixel = 2; 811 break; 812 813 case B_GRAY8: 814 case B_CMAP8: 815 bitsBytesPerPixel = 1; 816 break; 817 818 default: 819 return B_NO_TRANSLATOR; 820 }; 821 822 uint8 *pbitsrow = NULL, *prow = NULL; 823 // row buffers 824 // image buffer for writing whole png image at once 825 uint8 **prows = NULL; 826 png_uint_32 nalloc = 0; 827 828 png_structp ppng = NULL; 829 png_infop pinfo = NULL; 830 831 result = B_NO_TRANSLATOR; 832 while (ppng == NULL) { 833 // create PNG read pointer with default error handling routines 834 ppng = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, 835 NULL, NULL); 836 if (!ppng) { 837 result = B_ERROR; 838 break; 839 } 840 // alocate / init memory for image information 841 pinfo = png_create_info_struct(ppng); 842 if (!pinfo) { 843 result = B_ERROR; 844 break; 845 } 846 847 // set up erorr handling to use C++ exceptions instead of setjmp 848 png_set_error_fn(ppng, png_get_error_ptr(ppng), throw_error, 849 alert_warning); 850 851 try { 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, 911 width, pmap, bitsBytesPerPixel); 912 } 913 png_write_image(ppng, prows); 914 } 915 result = B_OK; 916 // If png_read_end throws an exception, we still accept 917 // the image as valid. 918 png_write_end(ppng, NULL); 919 920 break; 921 } catch(std::exception& e) { 922 break; 923 } 924 } 925 926 if (ppng) { 927 delete[] pbitsrow; 928 pbitsrow = NULL; 929 930 delete[] prow; 931 prow = NULL; 932 933 // delete row pointers and array of pointers to rows 934 while (nalloc) { 935 nalloc--; 936 delete[] prows[nalloc]; 937 } 938 delete[] prows; 939 prows = NULL; 940 941 // free PNG handle / info structures 942 if (!pinfo) 943 png_destroy_write_struct(&ppng, NULL); 944 else 945 png_destroy_write_struct(&ppng, &pinfo); 946 } 947 948 return result; 949 } 950 951 // --------------------------------------------------------------- 952 // DerivedTranslate 953 // 954 // Translates the data in inSource to the type outType and stores 955 // the translated data in outDestination. 956 // 957 // Preconditions: 958 // 959 // Parameters: inSource, the data to be translated 960 // 961 // inInfo, hint about the data in inSource (not used) 962 // 963 // ioExtension, configuration options for the 964 // translator 965 // 966 // outType, the type to convert inSource to 967 // 968 // outDestination, where the translated data is 969 // put 970 // 971 // baseType, indicates whether inSource is in the 972 // bits format, not in the bits format or 973 // is unknown 974 // 975 // Postconditions: 976 // 977 // Returns: B_BAD_VALUE, if the options in ioExtension are bad 978 // 979 // B_NO_TRANSLATOR, if this translator doesn't understand the data 980 // 981 // B_ERROR, if there was an error allocating memory or converting 982 // data 983 // 984 // B_OK, if all went well 985 // --------------------------------------------------------------- 986 status_t 987 PNGTranslator::DerivedTranslate(BPositionIO *inSource, 988 const translator_info *inInfo, BMessage *ioExtension, uint32 outType, 989 BPositionIO *outDestination, int32 baseType) 990 { 991 if (baseType == 1) 992 // if inSource is in bits format 993 return translate_from_bits_to_png(inSource, outDestination); 994 else if (baseType == 0) 995 // if inSource is NOT in bits format 996 return translate_from_png(inSource, outType, outDestination); 997 else 998 return B_NO_TRANSLATOR; 999 } 1000 1001 BView * 1002 PNGTranslator::NewConfigView(TranslatorSettings *settings) 1003 { 1004 return new PNGView(BRect(0, 0, PNG_VIEW_WIDTH, PNG_VIEW_HEIGHT), 1005 B_TRANSLATE("PNGTranslator Settings"), B_FOLLOW_ALL, 1006 B_WILL_DRAW, settings); 1007 } 1008 1009