Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/image-decoders/webp/WEBPImageDecoder.cpp

Index: Source/core/platform/image-decoders/webp/WEBPImageDecoder.cpp
diff --git a/Source/core/platform/image-decoders/webp/WEBPImageDecoder.cpp b/Source/core/platform/image-decoders/webp/WEBPImageDecoder.cpp
deleted file mode 100644
index c2da555d452343f5309e256824dfab61678c8988..0000000000000000000000000000000000000000
--- a/Source/core/platform/image-decoders/webp/WEBPImageDecoder.cpp
+++ /dev/null
@@ -1,547 +0,0 @@
-/*
- * Copyright (C) 2010 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
- *     its contributors may be used to endorse or promote products derived
- *     from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "core/platform/image-decoders/webp/WEBPImageDecoder.h"
-
-#include "RuntimeEnabledFeatures.h"
-#include "platform/PlatformInstrumentation.h"
-
-#if USE(QCMSLIB)
-#include "qcms.h"
-#endif
-
-#if CPU(BIG_ENDIAN) || CPU(MIDDLE_ENDIAN)
-#error Blink assumes a little-endian target.
-#endif
-
-#if SK_B32_SHIFT // Output little-endian RGBA pixels (Android).
-inline WEBP_CSP_MODE outputMode(bool hasAlpha) { return hasAlpha ? MODE_rgbA : MODE_RGBA; }
-#else // Output little-endian BGRA pixels.
-inline WEBP_CSP_MODE outputMode(bool hasAlpha) { return hasAlpha ? MODE_bgrA : MODE_BGRA; }
-#endif
-
-namespace WebCore {
-
-WEBPImageDecoder::WEBPImageDecoder(ImageSource::AlphaOption alphaOption,
-    ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption,
-    size_t maxDecodedBytes)
-    : ImageDecoder(alphaOption, gammaAndColorProfileOption, maxDecodedBytes)
-    , m_decoder(0)
-    , m_formatFlags(0)
-    , m_frameBackgroundHasAlpha(false)
-#if USE(QCMSLIB)
-    , m_haveReadProfile(false)
-    , m_transform(0)
-#endif
-    , m_demux(0)
-    , m_demuxState(WEBP_DEMUX_PARSING_HEADER)
-    , m_haveAlreadyParsedThisData(false)
-    , m_haveReadAnimationParameters(false)
-    , m_repetitionCount(cAnimationLoopOnce)
-    , m_decodedHeight(0)
-{
-}
-
-WEBPImageDecoder::~WEBPImageDecoder()
-{
-    clear();
-}
-
-void WEBPImageDecoder::clear()
-{
-#if USE(QCMSLIB)
-    if (m_transform)
-        qcms_transform_release(m_transform);
-    m_transform = 0;
-#endif
-    WebPDemuxDelete(m_demux);
-    m_demux = 0;
-    clearDecoder();
-}
-
-void WEBPImageDecoder::clearDecoder()
-{
-    WebPIDelete(m_decoder);
-    m_decoder = 0;
-    m_decodedHeight = 0;
-    m_frameBackgroundHasAlpha = false;
-}
-
-bool WEBPImageDecoder::isSizeAvailable()
-{
-    if (!ImageDecoder::isSizeAvailable())
-        updateDemuxer();
-
-    return ImageDecoder::isSizeAvailable();
-}
-
-size_t WEBPImageDecoder::frameCount()
-{
-    if (!updateDemuxer())
-        return 0;
-
-    return m_frameBufferCache.size();
-}
-
-ImageFrame* WEBPImageDecoder::frameBufferAtIndex(size_t index)
-{
-    if (index >= frameCount())
-        return 0;
-
-    ImageFrame& frame = m_frameBufferCache[index];
-    if (frame.status() == ImageFrame::FrameComplete)
-        return &frame;
-
-    if (RuntimeEnabledFeatures::animatedWebPEnabled()) {
-        Vector<size_t> framesToDecode;
-        size_t frameToDecode = index;
-        do {
-            framesToDecode.append(frameToDecode);
-            frameToDecode = m_frameBufferCache[frameToDecode].requiredPreviousFrameIndex();
-        } while (frameToDecode != kNotFound && m_frameBufferCache[frameToDecode].status() != ImageFrame::FrameComplete);
-
-        ASSERT(m_demux);
-        for (size_t i = framesToDecode.size(); i > 0; --i) {
-            size_t frameIndex = framesToDecode[i - 1];
-            if ((m_formatFlags & ANIMATION_FLAG) && !initFrameBuffer(frameIndex))
-                return 0;
-            WebPIterator webpFrame;
-            if (!WebPDemuxGetFrame(m_demux, frameIndex + 1, &webpFrame))
-                return 0;
-            PlatformInstrumentation::willDecodeImage("WEBP");
-            decode(webpFrame.fragment.bytes, webpFrame.fragment.size, false, frameIndex);
-            PlatformInstrumentation::didDecodeImage();
-            WebPDemuxReleaseIterator(&webpFrame);
-
-            if (failed())
-                return 0;
-
-            // We need more data to continue decoding.
-            if (m_frameBufferCache[frameIndex].status() != ImageFrame::FrameComplete)
-                break;
-        }
-
-        // It is also a fatal error if all data is received and we have decoded all
-        // frames available but the file is truncated.
-        if (index >= m_frameBufferCache.size() - 1 && isAllDataReceived() && m_demux && m_demuxState != WEBP_DEMUX_DONE)
-            setFailed();
-
-        frame.notifyBitmapIfPixelsChanged();
-        return &frame;
-    }
-
-    ASSERT(!index);
-    PlatformInstrumentation::willDecodeImage("WEBP");
-    decode(reinterpret_cast<const uint8_t*>(m_data->data()), m_data->size(), false, index);
-    PlatformInstrumentation::didDecodeImage();
-    return failed() ? 0 : &frame;
-}
-
-void WEBPImageDecoder::setData(SharedBuffer* data, bool allDataReceived)
-{
-    if (failed())
-        return;
-    ImageDecoder::setData(data, allDataReceived);
-    m_haveAlreadyParsedThisData = false;
-}
-
-int WEBPImageDecoder::repetitionCount() const
-{
-    return failed() ? cAnimationLoopOnce : m_repetitionCount;
-}
-
-bool WEBPImageDecoder::frameIsCompleteAtIndex(size_t index) const
-{
-    if (!RuntimeEnabledFeatures::animatedWebPEnabled())
-        return ImageDecoder::frameIsCompleteAtIndex(index);
-    if (!m_demux || m_demuxState <= WEBP_DEMUX_PARSING_HEADER)
-        return false;
-    if (!(m_formatFlags & ANIMATION_FLAG))
-        return ImageDecoder::frameIsCompleteAtIndex(index);
-    bool frameIsLoadedAtIndex = index < m_frameBufferCache.size();
-    return frameIsLoadedAtIndex;
-}
-
-float WEBPImageDecoder::frameDurationAtIndex(size_t index) const
-{
-    return index < m_frameBufferCache.size() ? m_frameBufferCache[index].duration() : 0;
-}
-
-bool WEBPImageDecoder::updateDemuxer()
-{
-    if (failed())
-        return false;
-
-    if (m_haveAlreadyParsedThisData)
-        return true;
-
-    m_haveAlreadyParsedThisData = true;
-
-    const unsigned webpHeaderSize = 20;
-    if (m_data->size() < webpHeaderSize)
-        return false; // Wait for headers so that WebPDemuxPartial doesn't return null.
-
-    WebPDemuxDelete(m_demux);
-    WebPData inputData = { reinterpret_cast<const uint8_t*>(m_data->data()), m_data->size() };
-    m_demux = WebPDemuxPartial(&inputData, &m_demuxState);
-    if (!m_demux)
-        return setFailed();
-
-    if (m_demuxState <= WEBP_DEMUX_PARSING_HEADER)
-        return false; // Not enough data for parsing canvas width/height yet.
-
-    bool hasAnimation = (m_formatFlags & ANIMATION_FLAG);
-    if (!ImageDecoder::isSizeAvailable()) {
-        m_formatFlags = WebPDemuxGetI(m_demux, WEBP_FF_FORMAT_FLAGS);
-        hasAnimation = (m_formatFlags & ANIMATION_FLAG);
-        if (hasAnimation && !RuntimeEnabledFeatures::animatedWebPEnabled())
-            return setFailed();
-        if (!setSize(WebPDemuxGetI(m_demux, WEBP_FF_CANVAS_WIDTH), WebPDemuxGetI(m_demux, WEBP_FF_CANVAS_HEIGHT)))
-            return setFailed();
-    }
-
-    ASSERT(ImageDecoder::isSizeAvailable());
-    const size_t newFrameCount = WebPDemuxGetI(m_demux, WEBP_FF_FRAME_COUNT);
-    if (hasAnimation && !m_haveReadAnimationParameters && newFrameCount) {
-        // As we have parsed at least one frame (even if partially),
-        // we must already have parsed the animation properties.
-        // This is because ANIM chunk always precedes ANMF chunks.
-        m_repetitionCount = WebPDemuxGetI(m_demux, WEBP_FF_LOOP_COUNT);
-        ASSERT(m_repetitionCount == (m_repetitionCount & 0xffff)); // Loop count is always <= 16 bits.
-        if (!m_repetitionCount)
-            m_repetitionCount = cAnimationLoopInfinite;
-        m_haveReadAnimationParameters = true;
-    }
-
-    const size_t oldFrameCount = m_frameBufferCache.size();
-    if (newFrameCount > oldFrameCount) {
-        m_frameBufferCache.resize(newFrameCount);
-        for (size_t i = oldFrameCount; i < newFrameCount; ++i) {
-            m_frameBufferCache[i].setPremultiplyAlpha(m_premultiplyAlpha);
-            if (!hasAnimation) {
-                ASSERT(!i);
-                m_frameBufferCache[i].setRequiredPreviousFrameIndex(kNotFound);
-                continue;
-            }
-            WebPIterator animatedFrame;
-            WebPDemuxGetFrame(m_demux, i + 1, &animatedFrame);
-            ASSERT(animatedFrame.complete == 1);
-            m_frameBufferCache[i].setDuration(animatedFrame.duration);
-            m_frameBufferCache[i].setDisposalMethod(animatedFrame.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND ? ImageFrame::DisposeOverwriteBgcolor : ImageFrame::DisposeKeep);
-            m_frameBufferCache[i].setAlphaBlendSource(animatedFrame.blend_method == WEBP_MUX_BLEND ? ImageFrame::BlendAtopPreviousFrame : ImageFrame::BlendAtopBgcolor);
-            IntRect frameRect(animatedFrame.x_offset, animatedFrame.y_offset, animatedFrame.width, animatedFrame.height);
-            // Make sure the frameRect doesn't extend outside the buffer.
-            if (frameRect.maxX() > size().width())
-                frameRect.setWidth(size().width() - animatedFrame.x_offset);
-            if (frameRect.maxY() > size().height())
-                frameRect.setHeight(size().height() - animatedFrame.y_offset);
-            m_frameBufferCache[i].setOriginalFrameRect(frameRect);
-            m_frameBufferCache[i].setRequiredPreviousFrameIndex(findRequiredPreviousFrame(i, !animatedFrame.has_alpha));
-            WebPDemuxReleaseIterator(&animatedFrame);
-        }
-    }
-
-    return true;
-}
-
-bool WEBPImageDecoder::initFrameBuffer(size_t frameIndex)
-{
-    ImageFrame& buffer = m_frameBufferCache[frameIndex];
-    if (buffer.status() != ImageFrame::FrameEmpty) // Already initialized.
-        return true;
-
-    const size_t requiredPreviousFrameIndex = buffer.requiredPreviousFrameIndex();
-    if (requiredPreviousFrameIndex == kNotFound) {
-        // This frame doesn't rely on any previous data.
-        if (!buffer.setSize(size().width(), size().height()))
-            return setFailed();
-        m_frameBackgroundHasAlpha = !buffer.originalFrameRect().contains(IntRect(IntPoint(), size()));
-    } else {
-        const ImageFrame& prevBuffer = m_frameBufferCache[requiredPreviousFrameIndex];
-        ASSERT(prevBuffer.status() == ImageFrame::FrameComplete);
-
-        // Preserve the last frame as the starting state for this frame.
-        if (!buffer.copyBitmapData(prevBuffer))
-            return setFailed();
-
-        if (prevBuffer.disposalMethod() == ImageFrame::DisposeOverwriteBgcolor) {
-            // We want to clear the previous frame to transparent, without
-            // affecting pixels in the image outside of the frame.
-            const IntRect& prevRect = prevBuffer.originalFrameRect();
-            ASSERT(!prevRect.contains(IntRect(IntPoint(), size())));
-            buffer.zeroFillFrameRect(prevRect);
-        }
-
-        m_frameBackgroundHasAlpha = prevBuffer.hasAlpha() || (prevBuffer.disposalMethod() == ImageFrame::DisposeOverwriteBgcolor);
-    }
-
-    buffer.setStatus(ImageFrame::FramePartial);
-    // The buffer is transparent outside the decoded area while the image is loading.
-    // The correct value of 'hasAlpha' for the frame will be set when it is fully decoded.
-    buffer.setHasAlpha(true);
-    return true;
-}
-
-size_t WEBPImageDecoder::clearCacheExceptFrame(size_t clearExceptFrame)
-{
-    // If |clearExceptFrame| has status FrameComplete, we preserve that frame.
-    // Otherwise, we preserve a previous frame with status FrameComplete whose data is required
-    // to decode |clearExceptFrame|, either in initFrameBuffer() or ApplyPostProcessing().
-    // All other frames can be cleared.
-    while ((clearExceptFrame < m_frameBufferCache.size()) && (m_frameBufferCache[clearExceptFrame].status() != ImageFrame::FrameComplete))
-        clearExceptFrame = m_frameBufferCache[clearExceptFrame].requiredPreviousFrameIndex();
-
-    return ImageDecoder::clearCacheExceptFrame(clearExceptFrame);
-}
-
-void WEBPImageDecoder::clearFrameBuffer(size_t frameIndex)
-{
-    if (m_demux && m_demuxState >= WEBP_DEMUX_PARSED_HEADER && m_frameBufferCache[frameIndex].status() == ImageFrame::FramePartial) {
-        // Clear the decoder state so that this partial frame can be decoded again when requested.
-        clearDecoder();
-    }
-    ImageDecoder::clearFrameBuffer(frameIndex);
-}
-
-#if USE(QCMSLIB)
-
-void WEBPImageDecoder::createColorTransform(const char* data, size_t size)
-{
-    if (m_transform)
-        qcms_transform_release(m_transform);
-    m_transform = 0;
-
-    qcms_profile* deviceProfile = ImageDecoder::qcmsOutputDeviceProfile();
-    if (!deviceProfile)
-        return;
-    qcms_profile* inputProfile = qcms_profile_from_memory(data, size);
-    if (!inputProfile)
-        return;
-
-    // We currently only support color profiles for RGB profiled images.
-    ASSERT(icSigRgbData == qcms_profile_get_color_space(inputProfile));
-    // The input image pixels are RGBA format.
-    qcms_data_type format = QCMS_DATA_RGBA_8;
-    // FIXME: Don't force perceptual intent if the image profile contains an intent.
-    m_transform = qcms_transform_create(inputProfile, format, deviceProfile, QCMS_DATA_RGBA_8, QCMS_INTENT_PERCEPTUAL);
-
-    qcms_profile_release(inputProfile);
-}
-
-void WEBPImageDecoder::readColorProfile()
-{
-    WebPChunkIterator chunkIterator;
-    if (!WebPDemuxGetChunk(m_demux, "ICCP", 1, &chunkIterator)) {
-        WebPDemuxReleaseChunkIterator(&chunkIterator);
-        return;
-    }
-
-    const char* profileData = reinterpret_cast<const char*>(chunkIterator.chunk.bytes);
-    size_t profileSize = chunkIterator.chunk.size;
-
-    // Only accept RGB color profiles from input class devices.
-    bool ignoreProfile = false;
-    if (profileSize < ImageDecoder::iccColorProfileHeaderLength)
-        ignoreProfile = true;
-    else if (!ImageDecoder::rgbColorProfile(profileData, profileSize))
-        ignoreProfile = true;
-    else if (!ImageDecoder::inputDeviceColorProfile(profileData, profileSize))
-        ignoreProfile = true;
-
-    if (!ignoreProfile)
-        createColorTransform(profileData, profileSize);
-
-    WebPDemuxReleaseChunkIterator(&chunkIterator);
-}
-
-#endif // USE(QCMSLIB)
-
-void WEBPImageDecoder::applyPostProcessing(size_t frameIndex)
-{
-    ImageFrame& buffer = m_frameBufferCache[frameIndex];
-    int width;
-    int decodedHeight;
-    if (!WebPIDecGetRGB(m_decoder, &decodedHeight, &width, 0, 0))
-        return; // See also https://bugs.webkit.org/show_bug.cgi?id=74062
-    if (decodedHeight <= 0)
-        return;
-
-    const IntRect& frameRect = buffer.originalFrameRect();
-    ASSERT_WITH_SECURITY_IMPLICATION(width == frameRect.width());
-    ASSERT_WITH_SECURITY_IMPLICATION(decodedHeight <= frameRect.height());
-    const int left = frameRect.x();
-    const int top = frameRect.y();
-
-#if USE(QCMSLIB)
-    if ((m_formatFlags & ICCP_FLAG) && !ignoresGammaAndColorProfile()) {
-        if (!m_haveReadProfile) {
-            readColorProfile();
-            m_haveReadProfile = true;
-        }
-        for (int y = m_decodedHeight; y < decodedHeight; ++y) {
-            const int canvasY = top + y;
-            uint8_t* row = reinterpret_cast<uint8_t*>(buffer.getAddr(left, canvasY));
-            if (qcms_transform* transform = colorTransform())
-                qcms_transform_data_type(transform, row, row, width, QCMS_OUTPUT_RGBX);
-            uint8_t* pixel = row;
-            for (int x = 0; x < width; ++x, pixel += 4) {
-                const int canvasX = left + x;
-                buffer.setRGBA(canvasX, canvasY, pixel[0], pixel[1], pixel[2], pixel[3]);
-            }
-        }
-    }
-#endif // USE(QCMSLIB)
-
-    // During the decoding of current frame, we may have set some pixels to be transparent (i.e. alpha < 255).
-    // However, the value of each of these pixels should have been determined by blending it against the value
-    // of that pixel in the previous frame if alpha blend source was 'BlendAtopPreviousFrame'. So, we correct these
-    // pixels based on disposal method of the previous frame and the previous frame buffer.
-    // FIXME: This could be avoided if libwebp decoder had an API that used the previous required frame
-    // to do the alpha-blending by itself.
-    if ((m_formatFlags & ANIMATION_FLAG) && frameIndex && buffer.alphaBlendSource() == ImageFrame::BlendAtopPreviousFrame && buffer.requiredPreviousFrameIndex() != kNotFound) {
-        ImageFrame& prevBuffer = m_frameBufferCache[frameIndex - 1];
-        ASSERT(prevBuffer.status() == ImageFrame::FrameComplete);
-        ImageFrame::DisposalMethod prevDisposalMethod = prevBuffer.disposalMethod();
-        if (prevDisposalMethod == ImageFrame::DisposeKeep) { // Restore transparent pixels to pixels in previous canvas.
-            for (int y = m_decodedHeight; y < decodedHeight; ++y) {
-                const int canvasY = top + y;
-                for (int x = 0; x < width; ++x) {
-                    const int canvasX = left + x;
-                    ImageFrame::PixelData& pixel = *buffer.getAddr(canvasX, canvasY);
-                    // FIXME: Use alpha-blending when alpha is between 0 and 255.
-                    // Alpha-blending is being implemented in: https://bugs.webkit.org/show_bug.cgi?id=17022
-                    if (!((pixel >> SK_A32_SHIFT) & 0xff)) {
-                        ImageFrame::PixelData prevPixel = *prevBuffer.getAddr(canvasX, canvasY);
-                        pixel = prevPixel;
-                    }
-                }
-            }
-        } else if (prevDisposalMethod == ImageFrame::DisposeOverwriteBgcolor) {
-            const IntRect& prevRect = prevBuffer.originalFrameRect();
-            // We need to restore transparent pixels to as they were just after initFrame() call. That is:
-            //   * Transparent if it belongs to prevRect <-- This is a no-op.
-            //   * Pixel in the previous canvas otherwise <-- Need to restore.
-            for (int y = m_decodedHeight; y < decodedHeight; ++y) {
-                const int canvasY = top + y;
-                for (int x = 0; x < width; ++x) {
-                    const int canvasX = left + x;
-                    ImageFrame::PixelData& pixel = *buffer.getAddr(canvasX, canvasY);
-                    // FIXME: Use alpha-blending when alpha is between 0 and 255.
-                    if (!((pixel >> SK_A32_SHIFT) & 0xff) && !prevRect.contains(IntPoint(canvasX, canvasY))) {
-                        ImageFrame::PixelData prevPixel = *prevBuffer.getAddr(canvasX, canvasY);
-                        pixel = prevPixel;
-                    }
-                }
-            }
-        }
-    }
-
-    m_decodedHeight = decodedHeight;
-    buffer.setPixelsChanged(true);
-}
-
-bool WEBPImageDecoder::decode(const uint8_t* dataBytes, size_t dataSize, bool onlySize, size_t frameIndex)
-{
-    if (failed())
-        return false;
-
-    if (!ImageDecoder::isSizeAvailable()) {
-        static const size_t imageHeaderSize = 30;
-        if (dataSize < imageHeaderSize)
-            return false;
-        int width, height;
-        WebPBitstreamFeatures features;
-        if (WebPGetFeatures(dataBytes, dataSize, &features) != VP8_STATUS_OK)
-            return setFailed();
-        width = features.width;
-        height = features.height;
-        m_formatFlags = features.has_alpha ? ALPHA_FLAG : 0;
-        if (!setSize(width, height))
-            return setFailed();
-    }
-
-    ASSERT(ImageDecoder::isSizeAvailable());
-    if (onlySize)
-        return true;
-
-    ASSERT(m_frameBufferCache.size() > frameIndex);
-    ImageFrame& buffer = m_frameBufferCache[frameIndex];
-    ASSERT(buffer.status() != ImageFrame::FrameComplete);
-
-    if (buffer.status() == ImageFrame::FrameEmpty) {
-        if (!buffer.setSize(size().width(), size().height()))
-            return setFailed();
-        buffer.setStatus(ImageFrame::FramePartial);
-        // The buffer is transparent outside the decoded area while the image is loading.
-        // The correct value of 'hasAlpha' for the frame will be set when it is fully decoded.
-        buffer.setHasAlpha(true);
-        buffer.setOriginalFrameRect(IntRect(IntPoint(), size()));
-    }
-
-    const IntRect& frameRect = buffer.originalFrameRect();
-    if (!m_decoder) {
-        WEBP_CSP_MODE mode = outputMode(m_formatFlags & ALPHA_FLAG);
-        if (!m_premultiplyAlpha)
-            mode = outputMode(false);
-#if USE(QCMSLIB)
-        if ((m_formatFlags & ICCP_FLAG) && !ignoresGammaAndColorProfile())
-            mode = MODE_RGBA; // Decode to RGBA for input to libqcms.
-#endif
-        WebPInitDecBuffer(&m_decoderBuffer);
-        m_decoderBuffer.colorspace = mode;
-        m_decoderBuffer.u.RGBA.stride = size().width() * sizeof(ImageFrame::PixelData);
-        m_decoderBuffer.u.RGBA.size = m_decoderBuffer.u.RGBA.stride * frameRect.height();
-        m_decoderBuffer.is_external_memory = 1;
-        m_decoder = WebPINewDecoder(&m_decoderBuffer);
-        if (!m_decoder)
-            return setFailed();
-    }
-
-    m_decoderBuffer.u.RGBA.rgba = reinterpret_cast<uint8_t*>(buffer.getAddr(frameRect.x(), frameRect.y()));
-
-    switch (WebPIUpdate(m_decoder, dataBytes, dataSize)) {
-    case VP8_STATUS_OK:
-        applyPostProcessing(frameIndex);
-        buffer.setHasAlpha((m_formatFlags & ALPHA_FLAG) || m_frameBackgroundHasAlpha);
-        buffer.setStatus(ImageFrame::FrameComplete);
-        clearDecoder();
-        return true;
-    case VP8_STATUS_SUSPENDED:
-        if (!isAllDataReceived() && !frameIsCompleteAtIndex(frameIndex)) {
-            applyPostProcessing(frameIndex);
-            return false;
-        }
-        // FALLTHROUGH
-    default:
-        clear();
-        return setFailed();
-    }
-}
-
-} // namespace WebCore