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| 1 /* | |
| 2 * Copyright (C) 2006 Apple Computer, Inc. | |
| 3 * | |
| 4 * Portions are Copyright (C) 2001-6 mozilla.org | |
| 5 * | |
| 6 * Other contributors: | |
| 7 * Stuart Parmenter <stuart@mozilla.com> | |
| 8 * | |
| 9 * Copyright (C) 2007-2009 Torch Mobile, Inc. | |
| 10 * | |
| 11 * This library is free software; you can redistribute it and/or | |
| 12 * modify it under the terms of the GNU Lesser General Public | |
| 13 * License as published by the Free Software Foundation; either | |
| 14 * version 2.1 of the License, or (at your option) any later version. | |
| 15 * | |
| 16 * This library is distributed in the hope that it will be useful, | |
| 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 19 * Lesser General Public License for more details. | |
| 20 * | |
| 21 * You should have received a copy of the GNU Lesser General Public | |
| 22 * License along with this library; if not, write to the Free Software | |
| 23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 US
A | |
| 24 * | |
| 25 * Alternatively, the contents of this file may be used under the terms | |
| 26 * of either the Mozilla Public License Version 1.1, found at | |
| 27 * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public | |
| 28 * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html | |
| 29 * (the "GPL"), in which case the provisions of the MPL or the GPL are | |
| 30 * applicable instead of those above. If you wish to allow use of your | |
| 31 * version of this file only under the terms of one of those two | |
| 32 * licenses (the MPL or the GPL) and not to allow others to use your | |
| 33 * version of this file under the LGPL, indicate your decision by | |
| 34 * deletingthe provisions above and replace them with the notice and | |
| 35 * other provisions required by the MPL or the GPL, as the case may be. | |
| 36 * If you do not delete the provisions above, a recipient may use your | |
| 37 * version of this file under any of the LGPL, the MPL or the GPL. | |
| 38 */ | |
| 39 | |
| 40 #include "config.h" | |
| 41 #include "core/platform/image-decoders/jpeg/JPEGImageDecoder.h" | |
| 42 | |
| 43 #include "platform/PlatformInstrumentation.h" | |
| 44 #include "wtf/PassOwnPtr.h" | |
| 45 #include "wtf/dtoa/utils.h" | |
| 46 | |
| 47 extern "C" { | |
| 48 #include <stdio.h> // jpeglib.h needs stdio FILE. | |
| 49 #include "jpeglib.h" | |
| 50 #if USE(ICCJPEG) | |
| 51 #include "iccjpeg.h" | |
| 52 #endif | |
| 53 #if USE(QCMSLIB) | |
| 54 #include "qcms.h" | |
| 55 #endif | |
| 56 #include <setjmp.h> | |
| 57 } | |
| 58 | |
| 59 #if CPU(BIG_ENDIAN) || CPU(MIDDLE_ENDIAN) | |
| 60 #error Blink assumes a little-endian target. | |
| 61 #endif | |
| 62 | |
| 63 #if defined(JCS_ALPHA_EXTENSIONS) | |
| 64 #define TURBO_JPEG_RGB_SWIZZLE | |
| 65 #if SK_B32_SHIFT // Output little-endian RGBA pixels (Android). | |
| 66 inline J_COLOR_SPACE rgbOutputColorSpace() { return JCS_EXT_RGBA; } | |
| 67 #else // Output little-endian BGRA pixels. | |
| 68 inline J_COLOR_SPACE rgbOutputColorSpace() { return JCS_EXT_BGRA; } | |
| 69 #endif | |
| 70 inline bool turboSwizzled(J_COLOR_SPACE colorSpace) { return colorSpace == JCS_E
XT_RGBA || colorSpace == JCS_EXT_BGRA; } | |
| 71 inline bool colorSpaceHasAlpha(J_COLOR_SPACE colorSpace) { return turboSwizzled(
colorSpace); } | |
| 72 #else | |
| 73 inline J_COLOR_SPACE rgbOutputColorSpace() { return JCS_RGB; } | |
| 74 inline bool colorSpaceHasAlpha(J_COLOR_SPACE) { return false; } | |
| 75 #endif | |
| 76 | |
| 77 #if USE(LOW_QUALITY_IMAGE_NO_JPEG_DITHERING) | |
| 78 inline J_DCT_METHOD dctMethod() { return JDCT_IFAST; } | |
| 79 inline J_DITHER_MODE ditherMode() { return JDITHER_NONE; } | |
| 80 #else | |
| 81 inline J_DCT_METHOD dctMethod() { return JDCT_ISLOW; } | |
| 82 inline J_DITHER_MODE ditherMode() { return JDITHER_FS; } | |
| 83 #endif | |
| 84 | |
| 85 #if USE(LOW_QUALITY_IMAGE_NO_JPEG_FANCY_UPSAMPLING) | |
| 86 inline bool doFancyUpsampling() { return false; } | |
| 87 #else | |
| 88 inline bool doFancyUpsampling() { return true; } | |
| 89 #endif | |
| 90 | |
| 91 namespace { | |
| 92 | |
| 93 const int exifMarker = JPEG_APP0 + 1; | |
| 94 | |
| 95 // JPEG only supports a denominator of 8. | |
| 96 const unsigned scaleDenominator = 8; | |
| 97 | |
| 98 } // namespace | |
| 99 | |
| 100 namespace WebCore { | |
| 101 | |
| 102 struct decoder_error_mgr { | |
| 103 struct jpeg_error_mgr pub; // "public" fields for IJG library | |
| 104 jmp_buf setjmp_buffer; // For handling catastropic errors | |
| 105 }; | |
| 106 | |
| 107 enum jstate { | |
| 108 JPEG_HEADER, // Reading JFIF headers | |
| 109 JPEG_START_DECOMPRESS, | |
| 110 JPEG_DECOMPRESS_PROGRESSIVE, // Output progressive pixels | |
| 111 JPEG_DECOMPRESS_SEQUENTIAL, // Output sequential pixels | |
| 112 JPEG_DONE, | |
| 113 JPEG_ERROR | |
| 114 }; | |
| 115 | |
| 116 void init_source(j_decompress_ptr jd); | |
| 117 boolean fill_input_buffer(j_decompress_ptr jd); | |
| 118 void skip_input_data(j_decompress_ptr jd, long num_bytes); | |
| 119 void term_source(j_decompress_ptr jd); | |
| 120 void error_exit(j_common_ptr cinfo); | |
| 121 | |
| 122 // Implementation of a JPEG src object that understands our state machine | |
| 123 struct decoder_source_mgr { | |
| 124 // public fields; must be first in this struct! | |
| 125 struct jpeg_source_mgr pub; | |
| 126 | |
| 127 JPEGImageReader* decoder; | |
| 128 }; | |
| 129 | |
| 130 static unsigned readUint16(JOCTET* data, bool isBigEndian) | |
| 131 { | |
| 132 if (isBigEndian) | |
| 133 return (GETJOCTET(data[0]) << 8) | GETJOCTET(data[1]); | |
| 134 return (GETJOCTET(data[1]) << 8) | GETJOCTET(data[0]); | |
| 135 } | |
| 136 | |
| 137 static unsigned readUint32(JOCTET* data, bool isBigEndian) | |
| 138 { | |
| 139 if (isBigEndian) | |
| 140 return (GETJOCTET(data[0]) << 24) | (GETJOCTET(data[1]) << 16) | (GETJOC
TET(data[2]) << 8) | GETJOCTET(data[3]); | |
| 141 return (GETJOCTET(data[3]) << 24) | (GETJOCTET(data[2]) << 16) | (GETJOCTET(
data[1]) << 8) | GETJOCTET(data[0]); | |
| 142 } | |
| 143 | |
| 144 static bool checkExifHeader(jpeg_saved_marker_ptr marker, bool& isBigEndian, uns
igned& ifdOffset) | |
| 145 { | |
| 146 // For exif data, the APP1 block is followed by 'E', 'x', 'i', 'f', '\0', | |
| 147 // then a fill byte, and then a tiff file that contains the metadata. | |
| 148 // A tiff file starts with 'I', 'I' (intel / little endian byte order) or | |
| 149 // 'M', 'M' (motorola / big endian byte order), followed by (uint16_t)42, | |
| 150 // followed by an uint32_t with the offset to the tag block, relative to the | |
| 151 // tiff file start. | |
| 152 const unsigned exifHeaderSize = 14; | |
| 153 if (!(marker->marker == exifMarker | |
| 154 && marker->data_length >= exifHeaderSize | |
| 155 && marker->data[0] == 'E' | |
| 156 && marker->data[1] == 'x' | |
| 157 && marker->data[2] == 'i' | |
| 158 && marker->data[3] == 'f' | |
| 159 && marker->data[4] == '\0' | |
| 160 // data[5] is a fill byte | |
| 161 && ((marker->data[6] == 'I' && marker->data[7] == 'I') | |
| 162 || (marker->data[6] == 'M' && marker->data[7] == 'M')))) | |
| 163 return false; | |
| 164 | |
| 165 isBigEndian = marker->data[6] == 'M'; | |
| 166 if (readUint16(marker->data + 8, isBigEndian) != 42) | |
| 167 return false; | |
| 168 | |
| 169 ifdOffset = readUint32(marker->data + 10, isBigEndian); | |
| 170 return true; | |
| 171 } | |
| 172 | |
| 173 static ImageOrientation readImageOrientation(jpeg_decompress_struct* info) | |
| 174 { | |
| 175 // The JPEG decoder looks at EXIF metadata. | |
| 176 // FIXME: Possibly implement XMP and IPTC support. | |
| 177 const unsigned orientationTag = 0x112; | |
| 178 const unsigned shortType = 3; | |
| 179 for (jpeg_saved_marker_ptr marker = info->marker_list; marker; marker = mark
er->next) { | |
| 180 bool isBigEndian; | |
| 181 unsigned ifdOffset; | |
| 182 if (!checkExifHeader(marker, isBigEndian, ifdOffset)) | |
| 183 continue; | |
| 184 const unsigned offsetToTiffData = 6; // Account for 'Exif\0<fill byte>'
header. | |
| 185 if (marker->data_length < offsetToTiffData || ifdOffset >= marker->data_
length - offsetToTiffData) | |
| 186 continue; | |
| 187 ifdOffset += offsetToTiffData; | |
| 188 | |
| 189 // The jpeg exif container format contains a tiff block for metadata. | |
| 190 // A tiff image file directory (ifd) consists of a uint16_t describing | |
| 191 // the number of ifd entries, followed by that many entries. | |
| 192 // When touching this code, it's useful to look at the tiff spec: | |
| 193 // http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf | |
| 194 JOCTET* ifd = marker->data + ifdOffset; | |
| 195 JOCTET* end = marker->data + marker->data_length; | |
| 196 if (end - ifd < 2) | |
| 197 continue; | |
| 198 unsigned tagCount = readUint16(ifd, isBigEndian); | |
| 199 ifd += 2; // Skip over the uint16 that was just read. | |
| 200 | |
| 201 // Every ifd entry is 2 bytes of tag, 2 bytes of contents datatype, | |
| 202 // 4 bytes of number-of-elements, and 4 bytes of either offset to the | |
| 203 // tag data, or if the data is small enough, the inlined data itself. | |
| 204 const int ifdEntrySize = 12; | |
| 205 for (unsigned i = 0; i < tagCount && end - ifd >= ifdEntrySize; ++i, ifd
+= ifdEntrySize) { | |
| 206 unsigned tag = readUint16(ifd, isBigEndian); | |
| 207 unsigned type = readUint16(ifd + 2, isBigEndian); | |
| 208 unsigned count = readUint32(ifd + 4, isBigEndian); | |
| 209 if (tag == orientationTag && type == shortType && count == 1) | |
| 210 return ImageOrientation::fromEXIFValue(readUint16(ifd + 8, isBig
Endian)); | |
| 211 } | |
| 212 } | |
| 213 | |
| 214 return ImageOrientation(); | |
| 215 } | |
| 216 | |
| 217 #if USE(QCMSLIB) | |
| 218 static void readColorProfile(jpeg_decompress_struct* info, ColorProfile& colorPr
ofile) | |
| 219 { | |
| 220 #if USE(ICCJPEG) | |
| 221 JOCTET* profile; | |
| 222 unsigned int profileLength; | |
| 223 | |
| 224 if (!read_icc_profile(info, &profile, &profileLength)) | |
| 225 return; | |
| 226 | |
| 227 // Only accept RGB color profiles from input class devices. | |
| 228 bool ignoreProfile = false; | |
| 229 char* profileData = reinterpret_cast<char*>(profile); | |
| 230 if (profileLength < ImageDecoder::iccColorProfileHeaderLength) | |
| 231 ignoreProfile = true; | |
| 232 else if (!ImageDecoder::rgbColorProfile(profileData, profileLength)) | |
| 233 ignoreProfile = true; | |
| 234 else if (!ImageDecoder::inputDeviceColorProfile(profileData, profileLength)) | |
| 235 ignoreProfile = true; | |
| 236 | |
| 237 ASSERT(colorProfile.isEmpty()); | |
| 238 if (!ignoreProfile) | |
| 239 colorProfile.append(profileData, profileLength); | |
| 240 free(profile); | |
| 241 #else | |
| 242 UNUSED_PARAM(info); | |
| 243 UNUSED_PARAM(colorProfile); | |
| 244 #endif | |
| 245 } | |
| 246 #endif | |
| 247 | |
| 248 class JPEGImageReader { | |
| 249 WTF_MAKE_FAST_ALLOCATED; | |
| 250 public: | |
| 251 JPEGImageReader(JPEGImageDecoder* decoder) | |
| 252 : m_decoder(decoder) | |
| 253 , m_bufferLength(0) | |
| 254 , m_bytesToSkip(0) | |
| 255 , m_state(JPEG_HEADER) | |
| 256 , m_samples(0) | |
| 257 #if USE(QCMSLIB) | |
| 258 , m_transform(0) | |
| 259 #endif | |
| 260 { | |
| 261 memset(&m_info, 0, sizeof(jpeg_decompress_struct)); | |
| 262 | |
| 263 // We set up the normal JPEG error routines, then override error_exit. | |
| 264 m_info.err = jpeg_std_error(&m_err.pub); | |
| 265 m_err.pub.error_exit = error_exit; | |
| 266 | |
| 267 // Allocate and initialize JPEG decompression object. | |
| 268 jpeg_create_decompress(&m_info); | |
| 269 | |
| 270 decoder_source_mgr* src = 0; | |
| 271 if (!m_info.src) { | |
| 272 src = (decoder_source_mgr*)fastCalloc(sizeof(decoder_source_mgr), 1)
; | |
| 273 if (!src) { | |
| 274 m_state = JPEG_ERROR; | |
| 275 return; | |
| 276 } | |
| 277 } | |
| 278 | |
| 279 m_info.src = (jpeg_source_mgr*)src; | |
| 280 | |
| 281 // Set up callback functions. | |
| 282 src->pub.init_source = init_source; | |
| 283 src->pub.fill_input_buffer = fill_input_buffer; | |
| 284 src->pub.skip_input_data = skip_input_data; | |
| 285 src->pub.resync_to_restart = jpeg_resync_to_restart; | |
| 286 src->pub.term_source = term_source; | |
| 287 src->decoder = this; | |
| 288 | |
| 289 #if USE(ICCJPEG) | |
| 290 // Retain ICC color profile markers for color management. | |
| 291 setup_read_icc_profile(&m_info); | |
| 292 #endif | |
| 293 | |
| 294 // Keep APP1 blocks, for obtaining exif data. | |
| 295 jpeg_save_markers(&m_info, exifMarker, 0xFFFF); | |
| 296 } | |
| 297 | |
| 298 ~JPEGImageReader() | |
| 299 { | |
| 300 close(); | |
| 301 } | |
| 302 | |
| 303 void close() | |
| 304 { | |
| 305 decoder_source_mgr* src = (decoder_source_mgr*)m_info.src; | |
| 306 if (src) | |
| 307 fastFree(src); | |
| 308 m_info.src = 0; | |
| 309 | |
| 310 #if USE(QCMSLIB) | |
| 311 if (m_transform) | |
| 312 qcms_transform_release(m_transform); | |
| 313 m_transform = 0; | |
| 314 #endif | |
| 315 jpeg_destroy_decompress(&m_info); | |
| 316 } | |
| 317 | |
| 318 void skipBytes(long numBytes) | |
| 319 { | |
| 320 decoder_source_mgr* src = (decoder_source_mgr*)m_info.src; | |
| 321 long bytesToSkip = std::min(numBytes, (long)src->pub.bytes_in_buffer); | |
| 322 src->pub.bytes_in_buffer -= (size_t)bytesToSkip; | |
| 323 src->pub.next_input_byte += bytesToSkip; | |
| 324 | |
| 325 m_bytesToSkip = std::max(numBytes - bytesToSkip, static_cast<long>(0)); | |
| 326 } | |
| 327 | |
| 328 bool decode(const SharedBuffer& data, bool onlySize) | |
| 329 { | |
| 330 unsigned newByteCount = data.size() - m_bufferLength; | |
| 331 unsigned readOffset = m_bufferLength - m_info.src->bytes_in_buffer; | |
| 332 | |
| 333 m_info.src->bytes_in_buffer += newByteCount; | |
| 334 m_info.src->next_input_byte = (JOCTET*)(data.data()) + readOffset; | |
| 335 | |
| 336 // If we still have bytes to skip, try to skip those now. | |
| 337 if (m_bytesToSkip) | |
| 338 skipBytes(m_bytesToSkip); | |
| 339 | |
| 340 m_bufferLength = data.size(); | |
| 341 | |
| 342 // We need to do the setjmp here. Otherwise bad things will happen | |
| 343 if (setjmp(m_err.setjmp_buffer)) | |
| 344 return m_decoder->setFailed(); | |
| 345 | |
| 346 switch (m_state) { | |
| 347 case JPEG_HEADER: | |
| 348 // Read file parameters with jpeg_read_header(). | |
| 349 if (jpeg_read_header(&m_info, true) == JPEG_SUSPENDED) | |
| 350 return false; // I/O suspension. | |
| 351 | |
| 352 switch (m_info.jpeg_color_space) { | |
| 353 case JCS_GRAYSCALE: | |
| 354 case JCS_RGB: | |
| 355 case JCS_YCbCr: | |
| 356 // libjpeg can convert GRAYSCALE and YCbCr image pixels to RGB. | |
| 357 m_info.out_color_space = rgbOutputColorSpace(); | |
| 358 #if defined(TURBO_JPEG_RGB_SWIZZLE) | |
| 359 if (m_info.saw_JFIF_marker) | |
| 360 break; | |
| 361 // FIXME: Swizzle decoding does not support Adobe transform=0 | |
| 362 // images (yet), so revert to using JSC_RGB in that case. | |
| 363 if (m_info.saw_Adobe_marker && !m_info.Adobe_transform) | |
| 364 m_info.out_color_space = JCS_RGB; | |
| 365 #endif | |
| 366 break; | |
| 367 case JCS_CMYK: | |
| 368 case JCS_YCCK: | |
| 369 // libjpeg can convert YCCK to CMYK, but neither to RGB, so we | |
| 370 // manually convert CMKY to RGB. | |
| 371 m_info.out_color_space = JCS_CMYK; | |
| 372 break; | |
| 373 default: | |
| 374 return m_decoder->setFailed(); | |
| 375 } | |
| 376 | |
| 377 m_state = JPEG_START_DECOMPRESS; | |
| 378 | |
| 379 // We can fill in the size now that the header is available. | |
| 380 if (!m_decoder->setSize(m_info.image_width, m_info.image_height)) | |
| 381 return false; | |
| 382 | |
| 383 m_decoder->setOrientation(readImageOrientation(info())); | |
| 384 | |
| 385 #if USE(QCMSLIB) | |
| 386 // Allow color management of the decoded RGBA pixels if possible. | |
| 387 if (!m_decoder->ignoresGammaAndColorProfile()) { | |
| 388 ColorProfile colorProfile; | |
| 389 readColorProfile(info(), colorProfile); | |
| 390 createColorTransform(colorProfile, colorSpaceHasAlpha(m_info.out
_color_space)); | |
| 391 #if defined(TURBO_JPEG_RGB_SWIZZLE) | |
| 392 // Input RGBA data to qcms. Note: restored to BGRA on output. | |
| 393 if (m_transform && m_info.out_color_space == JCS_EXT_BGRA) | |
| 394 m_info.out_color_space = JCS_EXT_RGBA; | |
| 395 #endif | |
| 396 } | |
| 397 #endif | |
| 398 // Don't allocate a giant and superfluous memory buffer when the | |
| 399 // image is a sequential JPEG. | |
| 400 m_info.buffered_image = jpeg_has_multiple_scans(&m_info); | |
| 401 | |
| 402 if (onlySize) { | |
| 403 // We can stop here. Reduce our buffer length and available data
. | |
| 404 m_bufferLength -= m_info.src->bytes_in_buffer; | |
| 405 m_info.src->bytes_in_buffer = 0; | |
| 406 return true; | |
| 407 } | |
| 408 // FALL THROUGH | |
| 409 | |
| 410 case JPEG_START_DECOMPRESS: | |
| 411 // Set parameters for decompression. | |
| 412 // FIXME -- Should reset dct_method and dither mode for final pass | |
| 413 // of progressive JPEG. | |
| 414 m_info.dct_method = dctMethod(); | |
| 415 m_info.dither_mode = ditherMode(); | |
| 416 m_info.do_fancy_upsampling = doFancyUpsampling(); | |
| 417 m_info.enable_2pass_quant = false; | |
| 418 m_info.do_block_smoothing = true; | |
| 419 | |
| 420 if (m_decoder->size() != m_decoder->decodedSize()) { | |
| 421 m_info.scale_denom = scaleDenominator; | |
| 422 m_info.scale_num = m_decoder->decodedSize().width() * scaleDenom
inator / m_info.image_width; | |
| 423 } | |
| 424 | |
| 425 // Used to set up image size so arrays can be allocated. | |
| 426 jpeg_calc_output_dimensions(&m_info); | |
| 427 | |
| 428 // Make a one-row-high sample array that will go away when done with | |
| 429 // image. Always make it big enough to hold an RGB row. Since this | |
| 430 // uses the IJG memory manager, it must be allocated before the call | |
| 431 // to jpeg_start_compress(). | |
| 432 // FIXME: note that some output color spaces do not need the samples | |
| 433 // buffer. Remove this allocation for those color spaces. | |
| 434 m_samples = (*m_info.mem->alloc_sarray)(reinterpret_cast<j_common_pt
r>(&m_info), JPOOL_IMAGE, m_info.output_width * 4, 1); | |
| 435 | |
| 436 // Start decompressor. | |
| 437 if (!jpeg_start_decompress(&m_info)) | |
| 438 return false; // I/O suspension. | |
| 439 | |
| 440 // If this is a progressive JPEG ... | |
| 441 m_state = (m_info.buffered_image) ? JPEG_DECOMPRESS_PROGRESSIVE : JP
EG_DECOMPRESS_SEQUENTIAL; | |
| 442 // FALL THROUGH | |
| 443 | |
| 444 case JPEG_DECOMPRESS_SEQUENTIAL: | |
| 445 if (m_state == JPEG_DECOMPRESS_SEQUENTIAL) { | |
| 446 | |
| 447 if (!m_decoder->outputScanlines()) | |
| 448 return false; // I/O suspension. | |
| 449 | |
| 450 // If we've completed image output... | |
| 451 ASSERT(m_info.output_scanline == m_info.output_height); | |
| 452 m_state = JPEG_DONE; | |
| 453 } | |
| 454 // FALL THROUGH | |
| 455 | |
| 456 case JPEG_DECOMPRESS_PROGRESSIVE: | |
| 457 if (m_state == JPEG_DECOMPRESS_PROGRESSIVE) { | |
| 458 int status; | |
| 459 do { | |
| 460 status = jpeg_consume_input(&m_info); | |
| 461 } while ((status != JPEG_SUSPENDED) && (status != JPEG_REACHED_E
OI)); | |
| 462 | |
| 463 for (;;) { | |
| 464 if (!m_info.output_scanline) { | |
| 465 int scan = m_info.input_scan_number; | |
| 466 | |
| 467 // If we haven't displayed anything yet | |
| 468 // (output_scan_number == 0) and we have enough data for | |
| 469 // a complete scan, force output of the last full scan. | |
| 470 if (!m_info.output_scan_number && (scan > 1) && (status
!= JPEG_REACHED_EOI)) | |
| 471 --scan; | |
| 472 | |
| 473 if (!jpeg_start_output(&m_info, scan)) | |
| 474 return false; // I/O suspension. | |
| 475 } | |
| 476 | |
| 477 if (m_info.output_scanline == 0xffffff) | |
| 478 m_info.output_scanline = 0; | |
| 479 | |
| 480 // If outputScanlines() fails, it deletes |this|. Therefore, | |
| 481 // copy the decoder pointer and use it to check for failure | |
| 482 // to avoid member access in the failure case. | |
| 483 JPEGImageDecoder* decoder = m_decoder; | |
| 484 if (!decoder->outputScanlines()) { | |
| 485 if (decoder->failed()) // Careful; |this| is deleted. | |
| 486 return false; | |
| 487 if (!m_info.output_scanline) | |
| 488 // Didn't manage to read any lines - flag so we | |
| 489 // don't call jpeg_start_output() multiple times for | |
| 490 // the same scan. | |
| 491 m_info.output_scanline = 0xffffff; | |
| 492 return false; // I/O suspension. | |
| 493 } | |
| 494 | |
| 495 if (m_info.output_scanline == m_info.output_height) { | |
| 496 if (!jpeg_finish_output(&m_info)) | |
| 497 return false; // I/O suspension. | |
| 498 | |
| 499 if (jpeg_input_complete(&m_info) && (m_info.input_scan_n
umber == m_info.output_scan_number)) | |
| 500 break; | |
| 501 | |
| 502 m_info.output_scanline = 0; | |
| 503 } | |
| 504 } | |
| 505 | |
| 506 m_state = JPEG_DONE; | |
| 507 } | |
| 508 // FALL THROUGH | |
| 509 | |
| 510 case JPEG_DONE: | |
| 511 // Finish decompression. | |
| 512 return jpeg_finish_decompress(&m_info); | |
| 513 | |
| 514 case JPEG_ERROR: | |
| 515 // We can get here if the constructor failed. | |
| 516 return m_decoder->setFailed(); | |
| 517 } | |
| 518 | |
| 519 return true; | |
| 520 } | |
| 521 | |
| 522 jpeg_decompress_struct* info() { return &m_info; } | |
| 523 JSAMPARRAY samples() const { return m_samples; } | |
| 524 JPEGImageDecoder* decoder() { return m_decoder; } | |
| 525 #if USE(QCMSLIB) | |
| 526 qcms_transform* colorTransform() const { return m_transform; } | |
| 527 | |
| 528 void createColorTransform(const ColorProfile& colorProfile, bool hasAlpha) | |
| 529 { | |
| 530 if (m_transform) | |
| 531 qcms_transform_release(m_transform); | |
| 532 m_transform = 0; | |
| 533 | |
| 534 if (colorProfile.isEmpty()) | |
| 535 return; | |
| 536 qcms_profile* deviceProfile = ImageDecoder::qcmsOutputDeviceProfile(); | |
| 537 if (!deviceProfile) | |
| 538 return; | |
| 539 qcms_profile* inputProfile = qcms_profile_from_memory(colorProfile.data(
), colorProfile.size()); | |
| 540 if (!inputProfile) | |
| 541 return; | |
| 542 // We currently only support color profiles for RGB profiled images. | |
| 543 ASSERT(icSigRgbData == qcms_profile_get_color_space(inputProfile)); | |
| 544 qcms_data_type dataFormat = hasAlpha ? QCMS_DATA_RGBA_8 : QCMS_DATA_RGB_
8; | |
| 545 // FIXME: Don't force perceptual intent if the image profile contains an
intent. | |
| 546 m_transform = qcms_transform_create(inputProfile, dataFormat, deviceProf
ile, dataFormat, QCMS_INTENT_PERCEPTUAL); | |
| 547 qcms_profile_release(inputProfile); | |
| 548 } | |
| 549 #endif | |
| 550 | |
| 551 private: | |
| 552 JPEGImageDecoder* m_decoder; | |
| 553 unsigned m_bufferLength; | |
| 554 int m_bytesToSkip; | |
| 555 | |
| 556 jpeg_decompress_struct m_info; | |
| 557 decoder_error_mgr m_err; | |
| 558 jstate m_state; | |
| 559 | |
| 560 JSAMPARRAY m_samples; | |
| 561 | |
| 562 #if USE(QCMSLIB) | |
| 563 qcms_transform* m_transform; | |
| 564 #endif | |
| 565 }; | |
| 566 | |
| 567 // Override the standard error method in the IJG JPEG decoder code. | |
| 568 void error_exit(j_common_ptr cinfo) | |
| 569 { | |
| 570 // Return control to the setjmp point. | |
| 571 decoder_error_mgr *err = reinterpret_cast_ptr<decoder_error_mgr *>(cinfo->er
r); | |
| 572 longjmp(err->setjmp_buffer, -1); | |
| 573 } | |
| 574 | |
| 575 void init_source(j_decompress_ptr) | |
| 576 { | |
| 577 } | |
| 578 | |
| 579 void skip_input_data(j_decompress_ptr jd, long num_bytes) | |
| 580 { | |
| 581 decoder_source_mgr *src = (decoder_source_mgr *)jd->src; | |
| 582 src->decoder->skipBytes(num_bytes); | |
| 583 } | |
| 584 | |
| 585 boolean fill_input_buffer(j_decompress_ptr) | |
| 586 { | |
| 587 // Our decode step always sets things up properly, so if this method is ever | |
| 588 // called, then we have hit the end of the buffer. A return value of false | |
| 589 // indicates that we have no data to supply yet. | |
| 590 return false; | |
| 591 } | |
| 592 | |
| 593 void term_source(j_decompress_ptr jd) | |
| 594 { | |
| 595 decoder_source_mgr *src = (decoder_source_mgr *)jd->src; | |
| 596 src->decoder->decoder()->jpegComplete(); | |
| 597 } | |
| 598 | |
| 599 JPEGImageDecoder::JPEGImageDecoder(ImageSource::AlphaOption alphaOption, | |
| 600 ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption, | |
| 601 size_t maxDecodedBytes) | |
| 602 : ImageDecoder(alphaOption, gammaAndColorProfileOption, maxDecodedBytes) | |
| 603 { | |
| 604 } | |
| 605 | |
| 606 JPEGImageDecoder::~JPEGImageDecoder() | |
| 607 { | |
| 608 } | |
| 609 | |
| 610 bool JPEGImageDecoder::isSizeAvailable() | |
| 611 { | |
| 612 if (!ImageDecoder::isSizeAvailable()) | |
| 613 decode(true); | |
| 614 | |
| 615 return ImageDecoder::isSizeAvailable(); | |
| 616 } | |
| 617 | |
| 618 bool JPEGImageDecoder::setSize(unsigned width, unsigned height) | |
| 619 { | |
| 620 if (!ImageDecoder::setSize(width, height)) | |
| 621 return false; | |
| 622 | |
| 623 size_t originalBytes = width * height * 4; | |
| 624 if (originalBytes <= m_maxDecodedBytes) { | |
| 625 m_decodedSize = IntSize(width, height); | |
| 626 return true; | |
| 627 } | |
| 628 | |
| 629 // Downsample according to the maximum decoded size. | |
| 630 unsigned scaleNumerator = static_cast<unsigned>(floor(sqrt( | |
| 631 // MSVC needs explicit parameter type for sqrt(). | |
| 632 static_cast<float>(m_maxDecodedBytes * scaleDenominator * scaleDenominat
or / originalBytes)))); | |
| 633 m_decodedSize = IntSize((scaleNumerator * width + scaleDenominator - 1) / sc
aleDenominator, | |
| 634 (scaleNumerator * height + scaleDenominator - 1) / scaleDenominator); | |
| 635 | |
| 636 // The image is too big to be downsampled by libjpeg. | |
| 637 // FIXME: Post-process to downsample the image. | |
| 638 if (m_decodedSize.isEmpty()) | |
| 639 return setFailed(); | |
| 640 | |
| 641 return true; | |
| 642 } | |
| 643 | |
| 644 ImageFrame* JPEGImageDecoder::frameBufferAtIndex(size_t index) | |
| 645 { | |
| 646 if (index) | |
| 647 return 0; | |
| 648 | |
| 649 if (m_frameBufferCache.isEmpty()) { | |
| 650 m_frameBufferCache.resize(1); | |
| 651 m_frameBufferCache[0].setPremultiplyAlpha(m_premultiplyAlpha); | |
| 652 } | |
| 653 | |
| 654 ImageFrame& frame = m_frameBufferCache[0]; | |
| 655 if (frame.status() != ImageFrame::FrameComplete) { | |
| 656 PlatformInstrumentation::willDecodeImage("JPEG"); | |
| 657 decode(false); | |
| 658 PlatformInstrumentation::didDecodeImage(); | |
| 659 } | |
| 660 | |
| 661 frame.notifyBitmapIfPixelsChanged(); | |
| 662 return &frame; | |
| 663 } | |
| 664 | |
| 665 bool JPEGImageDecoder::setFailed() | |
| 666 { | |
| 667 m_reader.clear(); | |
| 668 return ImageDecoder::setFailed(); | |
| 669 } | |
| 670 | |
| 671 template <J_COLOR_SPACE colorSpace> void setPixel(ImageFrame& buffer, ImageFrame
::PixelData* pixel, JSAMPARRAY samples, int column) | |
| 672 { | |
| 673 JSAMPLE* jsample = *samples + column * (colorSpace == JCS_RGB ? 3 : 4); | |
| 674 | |
| 675 switch (colorSpace) { | |
| 676 case JCS_RGB: | |
| 677 buffer.setRGBARaw(pixel, jsample[0], jsample[1], jsample[2], 255); | |
| 678 break; | |
| 679 case JCS_CMYK: | |
| 680 // Source is 'Inverted CMYK', output is RGB. | |
| 681 // See: http://www.easyrgb.com/math.php?MATH=M12#text12 | |
| 682 // Or: http://www.ilkeratalay.com/colorspacesfaq.php#rgb | |
| 683 // From CMYK to CMY: | |
| 684 // X = X * (1 - K ) + K [for X = C, M, or Y] | |
| 685 // Thus, from Inverted CMYK to CMY is: | |
| 686 // X = (1-iX) * (1 - (1-iK)) + (1-iK) => 1 - iX*iK | |
| 687 // From CMY (0..1) to RGB (0..1): | |
| 688 // R = 1 - C => 1 - (1 - iC*iK) => iC*iK [G and B similar] | |
| 689 unsigned k = jsample[3]; | |
| 690 buffer.setRGBARaw(pixel, jsample[0] * k / 255, jsample[1] * k / 255, jsa
mple[2] * k / 255, 255); | |
| 691 break; | |
| 692 } | |
| 693 } | |
| 694 | |
| 695 template <J_COLOR_SPACE colorSpace> bool outputRows(JPEGImageReader* reader, Ima
geFrame& buffer) | |
| 696 { | |
| 697 JSAMPARRAY samples = reader->samples(); | |
| 698 jpeg_decompress_struct* info = reader->info(); | |
| 699 int width = info->output_width; | |
| 700 | |
| 701 while (info->output_scanline < info->output_height) { | |
| 702 // jpeg_read_scanlines will increase the scanline counter, so we | |
| 703 // save the scanline before calling it. | |
| 704 int y = info->output_scanline; | |
| 705 // Request one scanline: returns 0 or 1 scanlines. | |
| 706 if (jpeg_read_scanlines(info, samples, 1) != 1) | |
| 707 return false; | |
| 708 #if USE(QCMSLIB) | |
| 709 if (reader->colorTransform() && colorSpace == JCS_RGB) | |
| 710 qcms_transform_data(reader->colorTransform(), *samples, *samples, wi
dth); | |
| 711 #endif | |
| 712 ImageFrame::PixelData* pixel = buffer.getAddr(0, y); | |
| 713 for (int x = 0; x < width; ++pixel, ++x) | |
| 714 setPixel<colorSpace>(buffer, pixel, samples, x); | |
| 715 } | |
| 716 | |
| 717 buffer.setPixelsChanged(true); | |
| 718 return true; | |
| 719 } | |
| 720 | |
| 721 bool JPEGImageDecoder::outputScanlines() | |
| 722 { | |
| 723 if (m_frameBufferCache.isEmpty()) | |
| 724 return false; | |
| 725 | |
| 726 jpeg_decompress_struct* info = m_reader->info(); | |
| 727 | |
| 728 // Initialize the framebuffer if needed. | |
| 729 ImageFrame& buffer = m_frameBufferCache[0]; | |
| 730 if (buffer.status() == ImageFrame::FrameEmpty) { | |
| 731 ASSERT(info->output_width == static_cast<JDIMENSION>(m_decodedSize.width
())); | |
| 732 ASSERT(info->output_height == static_cast<JDIMENSION>(m_decodedSize.heig
ht())); | |
| 733 | |
| 734 if (!buffer.setSize(info->output_width, info->output_height)) | |
| 735 return setFailed(); | |
| 736 buffer.setStatus(ImageFrame::FramePartial); | |
| 737 // The buffer is transparent outside the decoded area while the image is | |
| 738 // loading. The completed image will be marked fully opaque in jpegCompl
ete(). | |
| 739 buffer.setHasAlpha(true); | |
| 740 | |
| 741 // For JPEGs, the frame always fills the entire image. | |
| 742 buffer.setOriginalFrameRect(IntRect(IntPoint(), size())); | |
| 743 } | |
| 744 | |
| 745 #if defined(TURBO_JPEG_RGB_SWIZZLE) | |
| 746 if (turboSwizzled(info->out_color_space)) { | |
| 747 while (info->output_scanline < info->output_height) { | |
| 748 unsigned char* row = reinterpret_cast<unsigned char*>(buffer.getAddr
(0, info->output_scanline)); | |
| 749 if (jpeg_read_scanlines(info, &row, 1) != 1) | |
| 750 return false; | |
| 751 #if USE(QCMSLIB) | |
| 752 if (qcms_transform* transform = m_reader->colorTransform()) | |
| 753 qcms_transform_data_type(transform, row, row, info->output_width
, rgbOutputColorSpace() == JCS_EXT_BGRA ? QCMS_OUTPUT_BGRX : QCMS_OUTPUT_RGBX); | |
| 754 #endif | |
| 755 } | |
| 756 buffer.setPixelsChanged(true); | |
| 757 return true; | |
| 758 } | |
| 759 #endif | |
| 760 | |
| 761 switch (info->out_color_space) { | |
| 762 case JCS_RGB: | |
| 763 return outputRows<JCS_RGB>(m_reader.get(), buffer); | |
| 764 case JCS_CMYK: | |
| 765 return outputRows<JCS_CMYK>(m_reader.get(), buffer); | |
| 766 default: | |
| 767 ASSERT_NOT_REACHED(); | |
| 768 } | |
| 769 | |
| 770 return setFailed(); | |
| 771 } | |
| 772 | |
| 773 void JPEGImageDecoder::jpegComplete() | |
| 774 { | |
| 775 if (m_frameBufferCache.isEmpty()) | |
| 776 return; | |
| 777 | |
| 778 // Hand back an appropriately sized buffer, even if the image ended up being | |
| 779 // empty. | |
| 780 ImageFrame& buffer = m_frameBufferCache[0]; | |
| 781 buffer.setHasAlpha(false); | |
| 782 buffer.setStatus(ImageFrame::FrameComplete); | |
| 783 } | |
| 784 | |
| 785 void JPEGImageDecoder::decode(bool onlySize) | |
| 786 { | |
| 787 if (failed()) | |
| 788 return; | |
| 789 | |
| 790 if (!m_reader) { | |
| 791 m_reader = adoptPtr(new JPEGImageReader(this)); | |
| 792 } | |
| 793 | |
| 794 // If we couldn't decode the image but we've received all the data, decoding | |
| 795 // has failed. | |
| 796 if (!m_reader->decode(*m_data, onlySize) && isAllDataReceived()) | |
| 797 setFailed(); | |
| 798 // If we're done decoding the image, we don't need the JPEGImageReader | |
| 799 // anymore. (If we failed, |m_reader| has already been cleared.) | |
| 800 else if (!m_frameBufferCache.isEmpty() && (m_frameBufferCache[0].status() ==
ImageFrame::FrameComplete)) | |
| 801 m_reader.clear(); | |
| 802 } | |
| 803 | |
| 804 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 99103006:
Moving GraphicsContext and dependencies from core to platform. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk