/* * Copyright (C) 2006 Apple Computer, Inc. * * Portions are Copyright (C) 2001-6 mozilla.org * * Other contributors: * Stuart Parmenter * * Copyright (C) 2007-2009 Torch Mobile, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Alternatively, the contents of this file may be used under the terms * of either the Mozilla Public License Version 1.1, found at * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html * (the "GPL"), in which case the provisions of the MPL or the GPL are * applicable instead of those above. If you wish to allow use of your * version of this file only under the terms of one of those two * licenses (the MPL or the GPL) and not to allow others to use your * version of this file under the LGPL, indicate your decision by * deletingthe provisions above and replace them with the notice and * other provisions required by the MPL or the GPL, as the case may be. * If you do not delete the provisions above, a recipient may use your * version of this file under any of the LGPL, the MPL or the GPL. */ #include "config.h" #include "JPEGImageDecoder.h" #include "PlatformInstrumentation.h" #include extern "C" { #if USE(ICCJPEG) #include "iccjpeg.h" #endif #if USE(QCMSLIB) #include "qcms.h" #endif #include } #if CPU(BIG_ENDIAN) || CPU(MIDDLE_ENDIAN) #define ASSUME_LITTLE_ENDIAN 0 #else #define ASSUME_LITTLE_ENDIAN 1 #endif #if defined(JCS_ALPHA_EXTENSIONS) && ASSUME_LITTLE_ENDIAN #define TURBO_JPEG_RGB_SWIZZLE inline J_COLOR_SPACE rgbOutputColorSpace() { return JCS_EXT_BGRA; } inline bool turboSwizzled(J_COLOR_SPACE colorSpace) { return colorSpace == JCS_EXT_RGBA || colorSpace == JCS_EXT_BGRA; } inline bool colorSpaceHasAlpha(J_COLOR_SPACE colorSpace) { return turboSwizzled(colorSpace); } #else inline J_COLOR_SPACE rgbOutputColorSpace() { return JCS_RGB; } inline bool colorSpaceHasAlpha(J_COLOR_SPACE) { return false; } #endif #if USE(LOW_QUALITY_IMAGE_NO_JPEG_DITHERING) inline J_DCT_METHOD dctMethod() { return JDCT_IFAST; } inline J_DITHER_MODE ditherMode() { return JDITHER_NONE; } #else inline J_DCT_METHOD dctMethod() { return JDCT_ISLOW; } inline J_DITHER_MODE ditherMode() { return JDITHER_FS; } #endif #if USE(LOW_QUALITY_IMAGE_NO_JPEG_FANCY_UPSAMPLING) inline bool doFancyUpsampling() { return false; } #else inline bool doFancyUpsampling() { return true; } #endif const int exifMarker = JPEG_APP0 + 1; namespace WebCore { struct decoder_error_mgr { struct jpeg_error_mgr pub; // "public" fields for IJG library jmp_buf setjmp_buffer; // For handling catastropic errors }; enum jstate { JPEG_HEADER, // Reading JFIF headers JPEG_START_DECOMPRESS, JPEG_DECOMPRESS_PROGRESSIVE, // Output progressive pixels JPEG_DECOMPRESS_SEQUENTIAL, // Output sequential pixels JPEG_DONE, JPEG_ERROR }; void init_source(j_decompress_ptr jd); boolean fill_input_buffer(j_decompress_ptr jd); void skip_input_data(j_decompress_ptr jd, long num_bytes); void term_source(j_decompress_ptr jd); #if PLATFORM(QT) void error_exit(j_common_ptr) NO_RETURN; #else void error_exit(j_common_ptr cinfo); #endif // Implementation of a JPEG src object that understands our state machine struct decoder_source_mgr { // public fields; must be first in this struct! struct jpeg_source_mgr pub; JPEGImageReader* decoder; }; static unsigned readUint16(JOCTET* data, bool isBigEndian) { if (isBigEndian) return (GETJOCTET(data[0]) << 8) | GETJOCTET(data[1]); return (GETJOCTET(data[1]) << 8) | GETJOCTET(data[0]); } static unsigned readUint32(JOCTET* data, bool isBigEndian) { if (isBigEndian) return (GETJOCTET(data[0]) << 24) | (GETJOCTET(data[1]) << 16) | (GETJOCTET(data[2]) << 8) | GETJOCTET(data[3]); return (GETJOCTET(data[3]) << 24) | (GETJOCTET(data[2]) << 16) | (GETJOCTET(data[1]) << 8) | GETJOCTET(data[0]); } static bool checkExifHeader(jpeg_saved_marker_ptr marker, bool& isBigEndian, unsigned& ifdOffset) { // For exif data, the APP1 block is followed by 'E', 'x', 'i', 'f', '\0', // then a fill byte, and then a tiff file that contains the metadata. // A tiff file starts with 'I', 'I' (intel / little endian byte order) or // 'M', 'M' (motorola / big endian byte order), followed by (uint16_t)42, // followed by an uint32_t with the offset to the tag block, relative to the // tiff file start. const unsigned exifHeaderSize = 14; if (!(marker->marker == exifMarker && marker->data_length >= exifHeaderSize && marker->data[0] == 'E' && marker->data[1] == 'x' && marker->data[2] == 'i' && marker->data[3] == 'f' && marker->data[4] == '\0' // data[5] is a fill byte && ((marker->data[6] == 'I' && marker->data[7] == 'I') || (marker->data[6] == 'M' && marker->data[7] == 'M')))) return false; isBigEndian = marker->data[6] == 'M'; if (readUint16(marker->data + 8, isBigEndian) != 42) return false; ifdOffset = readUint32(marker->data + 10, isBigEndian); return true; } static ImageOrientation readImageOrientation(jpeg_decompress_struct* info) { // The JPEG decoder looks at EXIF metadata. // FIXME: Possibly implement XMP and IPTC support. const unsigned orientationTag = 0x112; const unsigned shortType = 3; for (jpeg_saved_marker_ptr marker = info->marker_list; marker; marker = marker->next) { bool isBigEndian; unsigned ifdOffset; if (!checkExifHeader(marker, isBigEndian, ifdOffset)) continue; const unsigned offsetToTiffData = 6; // Account for 'Exif\0' header. if (marker->data_length < offsetToTiffData || ifdOffset >= marker->data_length - offsetToTiffData) continue; ifdOffset += offsetToTiffData; // The jpeg exif container format contains a tiff block for metadata. // A tiff image file directory (ifd) consists of a uint16_t describing // the number of ifd entries, followed by that many entries. // When touching this code, it's useful to look at the tiff spec: // http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf JOCTET* ifd = marker->data + ifdOffset; JOCTET* end = marker->data + marker->data_length; if (end - ifd < 2) continue; unsigned tagCount = readUint16(ifd, isBigEndian); ifd += 2; // Skip over the uint16 that was just read. // Every ifd entry is 2 bytes of tag, 2 bytes of contents datatype, // 4 bytes of number-of-elements, and 4 bytes of either offset to the // tag data, or if the data is small enough, the inlined data itself. const int ifdEntrySize = 12; for (unsigned i = 0; i < tagCount && end - ifd >= ifdEntrySize; ++i, ifd += ifdEntrySize) { unsigned tag = readUint16(ifd, isBigEndian); unsigned type = readUint16(ifd + 2, isBigEndian); unsigned count = readUint32(ifd + 4, isBigEndian); if (tag == orientationTag && type == shortType && count == 1) return ImageOrientation::fromEXIFValue(readUint16(ifd + 8, isBigEndian)); } } return ImageOrientation(); } static ColorProfile readColorProfile(jpeg_decompress_struct* info) { #if USE(ICCJPEG) JOCTET* profile; unsigned int profileLength; if (!read_icc_profile(info, &profile, &profileLength)) return ColorProfile(); // Only accept RGB color profiles from input class devices. bool ignoreProfile = false; char* profileData = reinterpret_cast(profile); if (profileLength < ImageDecoder::iccColorProfileHeaderLength) ignoreProfile = true; else if (!ImageDecoder::rgbColorProfile(profileData, profileLength)) ignoreProfile = true; else if (!ImageDecoder::inputDeviceColorProfile(profileData, profileLength)) ignoreProfile = true; ColorProfile colorProfile; if (!ignoreProfile) colorProfile.append(profileData, profileLength); free(profile); return colorProfile; #else UNUSED_PARAM(info); return ColorProfile(); #endif } class JPEGImageReader { WTF_MAKE_FAST_ALLOCATED; public: JPEGImageReader(JPEGImageDecoder* decoder) : m_decoder(decoder) , m_bufferLength(0) , m_bytesToSkip(0) , m_state(JPEG_HEADER) , m_samples(0) #if USE(QCMSLIB) , m_transform(0) #endif { memset(&m_info, 0, sizeof(jpeg_decompress_struct)); // We set up the normal JPEG error routines, then override error_exit. m_info.err = jpeg_std_error(&m_err.pub); m_err.pub.error_exit = error_exit; // Allocate and initialize JPEG decompression object. jpeg_create_decompress(&m_info); decoder_source_mgr* src = 0; if (!m_info.src) { src = (decoder_source_mgr*)fastCalloc(sizeof(decoder_source_mgr), 1); if (!src) { m_state = JPEG_ERROR; return; } } m_info.src = (jpeg_source_mgr*)src; // Set up callback functions. src->pub.init_source = init_source; src->pub.fill_input_buffer = fill_input_buffer; src->pub.skip_input_data = skip_input_data; src->pub.resync_to_restart = jpeg_resync_to_restart; src->pub.term_source = term_source; src->decoder = this; #if USE(ICCJPEG) // Retain ICC color profile markers for color management. setup_read_icc_profile(&m_info); #endif // Keep APP1 blocks, for obtaining exif data. jpeg_save_markers(&m_info, exifMarker, 0xFFFF); } ~JPEGImageReader() { close(); } void close() { decoder_source_mgr* src = (decoder_source_mgr*)m_info.src; if (src) fastFree(src); m_info.src = 0; #if USE(QCMSLIB) if (m_transform) qcms_transform_release(m_transform); m_transform = 0; #endif jpeg_destroy_decompress(&m_info); } void skipBytes(long numBytes) { decoder_source_mgr* src = (decoder_source_mgr*)m_info.src; long bytesToSkip = std::min(numBytes, (long)src->pub.bytes_in_buffer); src->pub.bytes_in_buffer -= (size_t)bytesToSkip; src->pub.next_input_byte += bytesToSkip; m_bytesToSkip = std::max(numBytes - bytesToSkip, static_cast(0)); } bool decode(const SharedBuffer& data, bool onlySize) { m_decodingSizeOnly = onlySize; unsigned newByteCount = data.size() - m_bufferLength; unsigned readOffset = m_bufferLength - m_info.src->bytes_in_buffer; m_info.src->bytes_in_buffer += newByteCount; m_info.src->next_input_byte = (JOCTET*)(data.data()) + readOffset; // If we still have bytes to skip, try to skip those now. if (m_bytesToSkip) skipBytes(m_bytesToSkip); m_bufferLength = data.size(); // We need to do the setjmp here. Otherwise bad things will happen if (setjmp(m_err.setjmp_buffer)) return m_decoder->setFailed(); switch (m_state) { case JPEG_HEADER: // Read file parameters with jpeg_read_header(). if (jpeg_read_header(&m_info, true) == JPEG_SUSPENDED) return false; // I/O suspension. switch (m_info.jpeg_color_space) { case JCS_GRAYSCALE: case JCS_RGB: case JCS_YCbCr: // libjpeg can convert GRAYSCALE and YCbCr image pixels to RGB. m_info.out_color_space = rgbOutputColorSpace(); #if defined(TURBO_JPEG_RGB_SWIZZLE) if (m_info.saw_JFIF_marker) break; // FIXME: Swizzle decoding does not support Adobe transform=0 // images (yet), so revert to using JSC_RGB in that case. if (m_info.saw_Adobe_marker && !m_info.Adobe_transform) m_info.out_color_space = JCS_RGB; #endif break; case JCS_CMYK: case JCS_YCCK: // libjpeg can convert YCCK to CMYK, but neither to RGB, so we // manually convert CMKY to RGB. m_info.out_color_space = JCS_CMYK; break; default: return m_decoder->setFailed(); } m_state = JPEG_START_DECOMPRESS; // We can fill in the size now that the header is available. if (!m_decoder->setSize(m_info.image_width, m_info.image_height)) return false; m_decoder->setOrientation(readImageOrientation(info())); #if ENABLE(IMAGE_DECODER_DOWN_SAMPLING) && defined(TURBO_JPEG_RGB_SWIZZLE) // There's no point swizzle decoding if image down sampling will // be applied. Revert to using JSC_RGB in that case. if (m_decoder->willDownSample() && turboSwizzled(m_info.out_color_space)) m_info.out_color_space = JCS_RGB; #endif // Allow color management of the decoded RGBA pixels if possible. if (!m_decoder->ignoresGammaAndColorProfile()) { ColorProfile rgbInputDeviceColorProfile = readColorProfile(info()); if (!rgbInputDeviceColorProfile.isEmpty()) m_decoder->setColorProfile(rgbInputDeviceColorProfile); #if USE(QCMSLIB) createColorTransform(rgbInputDeviceColorProfile, colorSpaceHasAlpha(m_info.out_color_space)); #if defined(TURBO_JPEG_RGB_SWIZZLE) // Input RGBA data to qcms. Note: restored to BGRA on output. if (m_transform && m_info.out_color_space == JCS_EXT_BGRA) m_info.out_color_space = JCS_EXT_RGBA; #endif #endif } // Don't allocate a giant and superfluous memory buffer when the // image is a sequential JPEG. m_info.buffered_image = jpeg_has_multiple_scans(&m_info); // Used to set up image size so arrays can be allocated. jpeg_calc_output_dimensions(&m_info); // Make a one-row-high sample array that will go away when done with // image. Always make it big enough to hold an RGB row. Since this // uses the IJG memory manager, it must be allocated before the call // to jpeg_start_compress(). // FIXME: note that some output color spaces do not need the samples // buffer. Remove this allocation for those color spaces. m_samples = (*m_info.mem->alloc_sarray)((j_common_ptr) &m_info, JPOOL_IMAGE, m_info.output_width * 4, 1); if (m_decodingSizeOnly) { // We can stop here. Reduce our buffer length and available data. m_bufferLength -= m_info.src->bytes_in_buffer; m_info.src->bytes_in_buffer = 0; return true; } // FALL THROUGH case JPEG_START_DECOMPRESS: // Set parameters for decompression. // FIXME -- Should reset dct_method and dither mode for final pass // of progressive JPEG. m_info.dct_method = dctMethod(); m_info.dither_mode = ditherMode(); m_info.do_fancy_upsampling = doFancyUpsampling(); m_info.enable_2pass_quant = false; m_info.do_block_smoothing = true; // Start decompressor. if (!jpeg_start_decompress(&m_info)) return false; // I/O suspension. // If this is a progressive JPEG ... m_state = (m_info.buffered_image) ? JPEG_DECOMPRESS_PROGRESSIVE : JPEG_DECOMPRESS_SEQUENTIAL; // FALL THROUGH case JPEG_DECOMPRESS_SEQUENTIAL: if (m_state == JPEG_DECOMPRESS_SEQUENTIAL) { if (!m_decoder->outputScanlines()) return false; // I/O suspension. // If we've completed image output... ASSERT(m_info.output_scanline == m_info.output_height); m_state = JPEG_DONE; } // FALL THROUGH case JPEG_DECOMPRESS_PROGRESSIVE: if (m_state == JPEG_DECOMPRESS_PROGRESSIVE) { int status; do { status = jpeg_consume_input(&m_info); } while ((status != JPEG_SUSPENDED) && (status != JPEG_REACHED_EOI)); for (;;) { if (!m_info.output_scanline) { int scan = m_info.input_scan_number; // If we haven't displayed anything yet // (output_scan_number == 0) and we have enough data for // a complete scan, force output of the last full scan. if (!m_info.output_scan_number && (scan > 1) && (status != JPEG_REACHED_EOI)) --scan; if (!jpeg_start_output(&m_info, scan)) return false; // I/O suspension. } if (m_info.output_scanline == 0xffffff) m_info.output_scanline = 0; if (!m_decoder->outputScanlines()) { if (!m_info.output_scanline) // Didn't manage to read any lines - flag so we // don't call jpeg_start_output() multiple times for // the same scan. m_info.output_scanline = 0xffffff; return false; // I/O suspension. } if (m_info.output_scanline == m_info.output_height) { if (!jpeg_finish_output(&m_info)) return false; // I/O suspension. if (jpeg_input_complete(&m_info) && (m_info.input_scan_number == m_info.output_scan_number)) break; m_info.output_scanline = 0; } } m_state = JPEG_DONE; } // FALL THROUGH case JPEG_DONE: // Finish decompression. return jpeg_finish_decompress(&m_info); case JPEG_ERROR: // We can get here if the constructor failed. return m_decoder->setFailed(); } return true; } jpeg_decompress_struct* info() { return &m_info; } JSAMPARRAY samples() const { return m_samples; } JPEGImageDecoder* decoder() { return m_decoder; } #if USE(QCMSLIB) qcms_transform* colorTransform() const { return m_transform; } void createColorTransform(const ColorProfile& colorProfile, bool hasAlpha) { if (m_transform) qcms_transform_release(m_transform); m_transform = 0; if (colorProfile.isEmpty()) return; qcms_profile* deviceProfile = ImageDecoder::qcmsOutputDeviceProfile(); if (!deviceProfile) return; qcms_profile* inputProfile = qcms_profile_from_memory(colorProfile.data(), colorProfile.size()); if (!inputProfile) return; // We currently only support color profiles for RGB profiled images. ASSERT(icSigRgbData == qcms_profile_get_color_space(inputProfile)); qcms_data_type dataFormat = hasAlpha ? QCMS_DATA_RGBA_8 : QCMS_DATA_RGB_8; // FIXME: Don't force perceptual intent if the image profile contains an intent. m_transform = qcms_transform_create(inputProfile, dataFormat, deviceProfile, dataFormat, QCMS_INTENT_PERCEPTUAL); qcms_profile_release(inputProfile); } #endif private: JPEGImageDecoder* m_decoder; unsigned m_bufferLength; int m_bytesToSkip; bool m_decodingSizeOnly; jpeg_decompress_struct m_info; decoder_error_mgr m_err; jstate m_state; JSAMPARRAY m_samples; #if USE(QCMSLIB) qcms_transform* m_transform; #endif }; // Override the standard error method in the IJG JPEG decoder code. void error_exit(j_common_ptr cinfo) { // Return control to the setjmp point. decoder_error_mgr *err = reinterpret_cast_ptr(cinfo->err); longjmp(err->setjmp_buffer, -1); } void init_source(j_decompress_ptr) { } void skip_input_data(j_decompress_ptr jd, long num_bytes) { decoder_source_mgr *src = (decoder_source_mgr *)jd->src; src->decoder->skipBytes(num_bytes); } boolean fill_input_buffer(j_decompress_ptr) { // Our decode step always sets things up properly, so if this method is ever // called, then we have hit the end of the buffer. A return value of false // indicates that we have no data to supply yet. return false; } void term_source(j_decompress_ptr jd) { decoder_source_mgr *src = (decoder_source_mgr *)jd->src; src->decoder->decoder()->jpegComplete(); } JPEGImageDecoder::JPEGImageDecoder(ImageSource::AlphaOption alphaOption, ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption) : ImageDecoder(alphaOption, gammaAndColorProfileOption) { } JPEGImageDecoder::~JPEGImageDecoder() { } bool JPEGImageDecoder::isSizeAvailable() { if (!ImageDecoder::isSizeAvailable()) decode(true); return ImageDecoder::isSizeAvailable(); } bool JPEGImageDecoder::setSize(unsigned width, unsigned height) { if (!ImageDecoder::setSize(width, height)) return false; prepareScaleDataIfNecessary(); return true; } ImageFrame* JPEGImageDecoder::frameBufferAtIndex(size_t index) { if (index) return 0; if (m_frameBufferCache.isEmpty()) { m_frameBufferCache.resize(1); m_frameBufferCache[0].setPremultiplyAlpha(m_premultiplyAlpha); } ImageFrame& frame = m_frameBufferCache[0]; if (frame.status() != ImageFrame::FrameComplete) { PlatformInstrumentation::willDecodeImage("JPEG"); decode(false); PlatformInstrumentation::didDecodeImage(); } return &frame; } bool JPEGImageDecoder::setFailed() { m_reader.clear(); return ImageDecoder::setFailed(); } template void setPixel(ImageFrame& buffer, ImageFrame::PixelData* currentAddress, JSAMPARRAY samples, int column) { JSAMPLE* jsample = *samples + column * (colorSpace == JCS_RGB ? 3 : 4); switch (colorSpace) { case JCS_RGB: buffer.setRGBA(currentAddress, jsample[0], jsample[1], jsample[2], 0xFF); break; case JCS_CMYK: // Source is 'Inverted CMYK', output is RGB. // See: http://www.easyrgb.com/math.php?MATH=M12#text12 // Or: http://www.ilkeratalay.com/colorspacesfaq.php#rgb // From CMYK to CMY: // X = X * (1 - K ) + K [for X = C, M, or Y] // Thus, from Inverted CMYK to CMY is: // X = (1-iX) * (1 - (1-iK)) + (1-iK) => 1 - iX*iK // From CMY (0..1) to RGB (0..1): // R = 1 - C => 1 - (1 - iC*iK) => iC*iK [G and B similar] unsigned k = jsample[3]; buffer.setRGBA(currentAddress, jsample[0] * k / 255, jsample[1] * k / 255, jsample[2] * k / 255, 0xFF); break; } } template bool JPEGImageDecoder::outputScanlines(ImageFrame& buffer) { JSAMPARRAY samples = m_reader->samples(); jpeg_decompress_struct* info = m_reader->info(); int width = isScaled ? m_scaledColumns.size() : info->output_width; while (info->output_scanline < info->output_height) { // jpeg_read_scanlines will increase the scanline counter, so we // save the scanline before calling it. int sourceY = info->output_scanline; /* Request one scanline. Returns 0 or 1 scanlines. */ if (jpeg_read_scanlines(info, samples, 1) != 1) return false; int destY = scaledY(sourceY); if (destY < 0) continue; #if USE(QCMSLIB) if (m_reader->colorTransform() && colorSpace == JCS_RGB) qcms_transform_data(m_reader->colorTransform(), *samples, *samples, info->output_width); #endif ImageFrame::PixelData* currentAddress = buffer.getAddr(0, destY); for (int x = 0; x < width; ++x) { setPixel(buffer, currentAddress, samples, isScaled ? m_scaledColumns[x] : x); ++currentAddress; } } return true; } template bool JPEGImageDecoder::outputScanlines(ImageFrame& buffer) { return m_scaled ? outputScanlines(buffer) : outputScanlines(buffer); } bool JPEGImageDecoder::outputScanlines() { if (m_frameBufferCache.isEmpty()) return false; // Initialize the framebuffer if needed. ImageFrame& buffer = m_frameBufferCache[0]; if (buffer.status() == ImageFrame::FrameEmpty) { if (!buffer.setSize(scaledSize().width(), scaledSize().height())) return setFailed(); buffer.setStatus(ImageFrame::FramePartial); // The buffer is transparent outside the decoded area while the image is // loading. The completed image will be marked fully opaque in jpegComplete(). buffer.setHasAlpha(true); buffer.setColorProfile(m_colorProfile); // For JPEGs, the frame always fills the entire image. buffer.setOriginalFrameRect(IntRect(IntPoint(), size())); } jpeg_decompress_struct* info = m_reader->info(); #if defined(TURBO_JPEG_RGB_SWIZZLE) if (!m_scaled && turboSwizzled(info->out_color_space)) { while (info->output_scanline < info->output_height) { unsigned char* row = reinterpret_cast(buffer.getAddr(0, info->output_scanline)); if (jpeg_read_scanlines(info, &row, 1) != 1) return false; #if USE(QCMSLIB) if (qcms_transform* transform = m_reader->colorTransform()) qcms_transform_data_type(transform, row, row, info->output_width, rgbOutputColorSpace() == JCS_EXT_BGRA ? QCMS_OUTPUT_BGRX : QCMS_OUTPUT_RGBX); #endif } return true; } #endif switch (info->out_color_space) { // The code inside outputScanlines will be executed // for each pixel, so we want to avoid any extra comparisons there. // That is why we use template and template specializations here so // the proper code will be generated at compile time. case JCS_RGB: return outputScanlines(buffer); case JCS_CMYK: return outputScanlines(buffer); default: ASSERT_NOT_REACHED(); } return setFailed(); } void JPEGImageDecoder::jpegComplete() { if (m_frameBufferCache.isEmpty()) return; // Hand back an appropriately sized buffer, even if the image ended up being // empty. ImageFrame& buffer = m_frameBufferCache[0]; buffer.setHasAlpha(false); buffer.setStatus(ImageFrame::FrameComplete); } void JPEGImageDecoder::decode(bool onlySize) { if (failed()) return; if (!m_reader) m_reader = adoptPtr(new JPEGImageReader(this)); // If we couldn't decode the image but we've received all the data, decoding // has failed. if (!m_reader->decode(*m_data, onlySize) && isAllDataReceived()) setFailed(); // If we're done decoding the image, we don't need the JPEGImageReader // anymore. (If we failed, |m_reader| has already been cleared.) else if (!m_frameBufferCache.isEmpty() && (m_frameBufferCache[0].status() == ImageFrame::FrameComplete)) m_reader.clear(); } }