Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/image-decoders/jpeg/JPEGImageDecoder.cpp

Index: Source/core/platform/image-decoders/jpeg/JPEGImageDecoder.cpp
diff --git a/Source/core/platform/image-decoders/jpeg/JPEGImageDecoder.cpp b/Source/core/platform/image-decoders/jpeg/JPEGImageDecoder.cpp
deleted file mode 100644
index b988f8c7904217f8891985966d6e8a5b9a6a793a..0000000000000000000000000000000000000000
--- a/Source/core/platform/image-decoders/jpeg/JPEGImageDecoder.cpp
+++ /dev/null
@@ -1,804 +0,0 @@
-/*
- * Copyright (C) 2006 Apple Computer, Inc.
- *
- * Portions are Copyright (C) 2001-6 mozilla.org
- *
- * Other contributors:
- *   Stuart Parmenter <stuart@mozilla.com>
- *
- * 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 "core/platform/image-decoders/jpeg/JPEGImageDecoder.h"
-
-#include "platform/PlatformInstrumentation.h"
-#include "wtf/PassOwnPtr.h"
-#include "wtf/dtoa/utils.h"
-
-extern "C" {
-#include <stdio.h> // jpeglib.h needs stdio FILE.
-#include "jpeglib.h"
-#if USE(ICCJPEG)
-#include "iccjpeg.h"
-#endif
-#if USE(QCMSLIB)
-#include "qcms.h"
-#endif
-#include <setjmp.h>
-}
-
-#if CPU(BIG_ENDIAN) || CPU(MIDDLE_ENDIAN)
-#error Blink assumes a little-endian target.
-#endif
-
-#if defined(JCS_ALPHA_EXTENSIONS)
-#define TURBO_JPEG_RGB_SWIZZLE
-#if SK_B32_SHIFT // Output little-endian RGBA pixels (Android).
-inline J_COLOR_SPACE rgbOutputColorSpace() { return JCS_EXT_RGBA; }
-#else // Output little-endian BGRA pixels.
-inline J_COLOR_SPACE rgbOutputColorSpace() { return JCS_EXT_BGRA; }
-#endif
-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
-
-namespace {
-
-const int exifMarker = JPEG_APP0 + 1;
-
-// JPEG only supports a denominator of 8.
-const unsigned scaleDenominator = 8;
-
-} // namespace
-
-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);
-void error_exit(j_common_ptr cinfo);
-
-// 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<fill byte>' 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();
-}
-
-#if USE(QCMSLIB)
-static void readColorProfile(jpeg_decompress_struct* info, ColorProfile& colorProfile)
-{
-#if USE(ICCJPEG)
-    JOCTET* profile;
-    unsigned int profileLength;
-
-    if (!read_icc_profile(info, &profile, &profileLength))
-        return;
-
-    // Only accept RGB color profiles from input class devices.
-    bool ignoreProfile = false;
-    char* profileData = reinterpret_cast<char*>(profile);
-    if (profileLength < ImageDecoder::iccColorProfileHeaderLength)
-        ignoreProfile = true;
-    else if (!ImageDecoder::rgbColorProfile(profileData, profileLength))
-        ignoreProfile = true;
-    else if (!ImageDecoder::inputDeviceColorProfile(profileData, profileLength))
-        ignoreProfile = true;
-
-    ASSERT(colorProfile.isEmpty());
-    if (!ignoreProfile)
-        colorProfile.append(profileData, profileLength);
-    free(profile);
-#else
-    UNUSED_PARAM(info);
-    UNUSED_PARAM(colorProfile);
-#endif
-}
-#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<long>(0));
-    }
-
-    bool decode(const SharedBuffer& data, bool 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 USE(QCMSLIB)
-            // Allow color management of the decoded RGBA pixels if possible.
-            if (!m_decoder->ignoresGammaAndColorProfile()) {
-                ColorProfile colorProfile;
-                readColorProfile(info(), colorProfile);
-                createColorTransform(colorProfile, 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);
-
-            if (onlySize) {
-                // 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;
-
-            if (m_decoder->size() != m_decoder->decodedSize()) {
-                m_info.scale_denom = scaleDenominator;
-                m_info.scale_num = m_decoder->decodedSize().width() * scaleDenominator / m_info.image_width;
-            }
-
-            // 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)(reinterpret_cast<j_common_ptr>(&m_info), JPOOL_IMAGE, m_info.output_width * 4, 1);
-
-            // 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 outputScanlines() fails, it deletes |this|. Therefore,
-                    // copy the decoder pointer and use it to check for failure
-                    // to avoid member access in the failure case.
-                    JPEGImageDecoder* decoder = m_decoder;
-                    if (!decoder->outputScanlines()) {
-                        if (decoder->failed()) // Careful; |this| is deleted.
-                            return false;
-                        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;
-
-    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<decoder_error_mgr *>(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,
-    size_t maxDecodedBytes)
-    : ImageDecoder(alphaOption, gammaAndColorProfileOption, maxDecodedBytes)
-{
-}
-
-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;
-
-    size_t originalBytes = width * height * 4;
-    if (originalBytes <= m_maxDecodedBytes) {
-        m_decodedSize = IntSize(width, height);
-        return true;
-    }
-
-    // Downsample according to the maximum decoded size.
-    unsigned scaleNumerator = static_cast<unsigned>(floor(sqrt(
-        // MSVC needs explicit parameter type for sqrt().
-        static_cast<float>(m_maxDecodedBytes * scaleDenominator * scaleDenominator / originalBytes))));
-    m_decodedSize = IntSize((scaleNumerator * width + scaleDenominator - 1) / scaleDenominator,
-        (scaleNumerator * height + scaleDenominator - 1) / scaleDenominator);
-
-    // The image is too big to be downsampled by libjpeg.
-    // FIXME: Post-process to downsample the image.
-    if (m_decodedSize.isEmpty())
-        return setFailed();
-
-    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();
-    }
-
-    frame.notifyBitmapIfPixelsChanged();
-    return &frame;
-}
-
-bool JPEGImageDecoder::setFailed()
-{
-    m_reader.clear();
-    return ImageDecoder::setFailed();
-}
-
-template <J_COLOR_SPACE colorSpace> void setPixel(ImageFrame& buffer, ImageFrame::PixelData* pixel, JSAMPARRAY samples, int column)
-{
-    JSAMPLE* jsample = *samples + column * (colorSpace == JCS_RGB ? 3 : 4);
-
-    switch (colorSpace) {
-    case JCS_RGB:
-        buffer.setRGBARaw(pixel, jsample[0], jsample[1], jsample[2], 255);
-        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.setRGBARaw(pixel, jsample[0] * k / 255, jsample[1] * k / 255, jsample[2] * k / 255, 255);
-        break;
-    }
-}
-
-template <J_COLOR_SPACE colorSpace> bool outputRows(JPEGImageReader* reader, ImageFrame& buffer)
-{
-    JSAMPARRAY samples = reader->samples();
-    jpeg_decompress_struct* info = reader->info();
-    int width = 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 y = info->output_scanline;
-        // Request one scanline: returns 0 or 1 scanlines.
-        if (jpeg_read_scanlines(info, samples, 1) != 1)
-            return false;
-#if USE(QCMSLIB)
-        if (reader->colorTransform() && colorSpace == JCS_RGB)
-            qcms_transform_data(reader->colorTransform(), *samples, *samples, width);
-#endif
-        ImageFrame::PixelData* pixel = buffer.getAddr(0, y);
-        for (int x = 0; x < width; ++pixel, ++x)
-            setPixel<colorSpace>(buffer, pixel, samples, x);
-    }
-
-    buffer.setPixelsChanged(true);
-    return true;
-}
-
-bool JPEGImageDecoder::outputScanlines()
-{
-    if (m_frameBufferCache.isEmpty())
-        return false;
-
-    jpeg_decompress_struct* info = m_reader->info();
-
-    // Initialize the framebuffer if needed.
-    ImageFrame& buffer = m_frameBufferCache[0];
-    if (buffer.status() == ImageFrame::FrameEmpty) {
-        ASSERT(info->output_width == static_cast<JDIMENSION>(m_decodedSize.width()));
-        ASSERT(info->output_height == static_cast<JDIMENSION>(m_decodedSize.height()));
-
-        if (!buffer.setSize(info->output_width, info->output_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);
-
-        // For JPEGs, the frame always fills the entire image.
-        buffer.setOriginalFrameRect(IntRect(IntPoint(), size()));
-    }
-
-#if defined(TURBO_JPEG_RGB_SWIZZLE)
-    if (turboSwizzled(info->out_color_space)) {
-        while (info->output_scanline < info->output_height) {
-            unsigned char* row = reinterpret_cast<unsigned char*>(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
-        }
-        buffer.setPixelsChanged(true);
-        return true;
-    }
-#endif
-
-    switch (info->out_color_space) {
-    case JCS_RGB:
-        return outputRows<JCS_RGB>(m_reader.get(), buffer);
-    case JCS_CMYK:
-        return outputRows<JCS_CMYK>(m_reader.get(), 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();
-}
-
-}