Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/image-decoders/ico/ICOImageDecoder.cpp

Index: Source/core/platform/image-decoders/ico/ICOImageDecoder.cpp
diff --git a/Source/core/platform/image-decoders/ico/ICOImageDecoder.cpp b/Source/core/platform/image-decoders/ico/ICOImageDecoder.cpp
deleted file mode 100644
index 075e49828688fa33460dcc403aa6c723887ae573..0000000000000000000000000000000000000000
--- a/Source/core/platform/image-decoders/ico/ICOImageDecoder.cpp
+++ /dev/null
@@ -1,346 +0,0 @@
-/*
- * Copyright (c) 2008, 2009, 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:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * 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.
- *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
- * OWNER OR 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/ico/ICOImageDecoder.h"
-
-#include <algorithm>
-
-#include "core/platform/image-decoders/png/PNGImageDecoder.h"
-#include "platform/PlatformInstrumentation.h"
-#include "wtf/PassOwnPtr.h"
-
-namespace WebCore {
-
-// Number of bits in .ICO/.CUR used to store the directory and its entries,
-// respectively (doesn't match sizeof values for member structs since we omit
-// some fields).
-static const size_t sizeOfDirectory = 6;
-static const size_t sizeOfDirEntry = 16;
-
-ICOImageDecoder::ICOImageDecoder(ImageSource::AlphaOption alphaOption,
-    ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption,
-    size_t maxDecodedBytes)
-    : ImageDecoder(alphaOption, gammaAndColorProfileOption, maxDecodedBytes)
-    , m_decodedOffset(0)
-{
-}
-
-ICOImageDecoder::~ICOImageDecoder()
-{
-}
-
-void ICOImageDecoder::setData(SharedBuffer* data, bool allDataReceived)
-{
-    if (failed())
-        return;
-
-    ImageDecoder::setData(data, allDataReceived);
-
-    for (BMPReaders::iterator i(m_bmpReaders.begin()); i != m_bmpReaders.end(); ++i) {
-        if (*i)
-            (*i)->setData(data);
-    }
-    for (size_t i = 0; i < m_pngDecoders.size(); ++i)
-        setDataForPNGDecoderAtIndex(i);
-}
-
-bool ICOImageDecoder::isSizeAvailable()
-{
-    if (!ImageDecoder::isSizeAvailable())
-        decode(0, true);
-
-    return ImageDecoder::isSizeAvailable();
-}
-
-IntSize ICOImageDecoder::size() const
-{
-    return m_frameSize.isEmpty() ? ImageDecoder::size() : m_frameSize;
-}
-
-IntSize ICOImageDecoder::frameSizeAtIndex(size_t index) const
-{
-    return (index && (index < m_dirEntries.size())) ? m_dirEntries[index].m_size : size();
-}
-
-bool ICOImageDecoder::setSize(unsigned width, unsigned height)
-{
-    // The size calculated inside the BMPImageReader had better match the one in
-    // the icon directory.
-    return m_frameSize.isEmpty() ? ImageDecoder::setSize(width, height) : ((IntSize(width, height) == m_frameSize) || setFailed());
-}
-
-size_t ICOImageDecoder::frameCount()
-{
-    decode(0, true);
-    if (m_frameBufferCache.isEmpty()) {
-        m_frameBufferCache.resize(m_dirEntries.size());
-        for (size_t i = 0; i < m_dirEntries.size(); ++i) {
-            m_frameBufferCache[i].setPremultiplyAlpha(m_premultiplyAlpha);
-            m_frameBufferCache[i].setRequiredPreviousFrameIndex(kNotFound);
-        }
-    }
-    // CAUTION: We must not resize m_frameBufferCache again after this, as
-    // decodeAtIndex() may give a BMPImageReader a pointer to one of the
-    // entries.
-    return m_frameBufferCache.size();
-}
-
-ImageFrame* ICOImageDecoder::frameBufferAtIndex(size_t index)
-{
-    // Ensure |index| is valid.
-    if (index >= frameCount())
-        return 0;
-
-    ImageFrame* buffer = &m_frameBufferCache[index];
-    if (buffer->status() != ImageFrame::FrameComplete) {
-        PlatformInstrumentation::willDecodeImage("ICO");
-        decode(index, false);
-        PlatformInstrumentation::didDecodeImage();
-    }
-    return buffer;
-}
-
-bool ICOImageDecoder::setFailed()
-{
-    m_bmpReaders.clear();
-    m_pngDecoders.clear();
-    return ImageDecoder::setFailed();
-}
-
-bool ICOImageDecoder::hotSpot(IntPoint& hotSpot) const
-{
-    // When unspecified, the default frame is always frame 0. This is consistent with
-    // BitmapImage where currentFrame() starts at 0 and only increases when animation is
-    // requested.
-    return hotSpotAtIndex(0, hotSpot);
-}
-
-bool ICOImageDecoder::hotSpotAtIndex(size_t index, IntPoint& hotSpot) const
-{
-    if (index >= m_dirEntries.size() || m_fileType != CURSOR)
-        return false;
-
-    hotSpot = m_dirEntries[index].m_hotSpot;
-    return true;
-}
-
-
-// static
-bool ICOImageDecoder::compareEntries(const IconDirectoryEntry& a, const IconDirectoryEntry& b)
-{
-    // Larger icons are better.  After that, higher bit-depth icons are better.
-    const int aEntryArea = a.m_size.width() * a.m_size.height();
-    const int bEntryArea = b.m_size.width() * b.m_size.height();
-    return (aEntryArea == bEntryArea) ? (a.m_bitCount > b.m_bitCount) : (aEntryArea > bEntryArea);
-}
-
-void ICOImageDecoder::setDataForPNGDecoderAtIndex(size_t index)
-{
-    if (!m_pngDecoders[index])
-        return;
-
-    const IconDirectoryEntry& dirEntry = m_dirEntries[index];
-    // Copy out PNG data to a separate vector and send to the PNG decoder.
-    // FIXME: Save this copy by making the PNG decoder able to take an
-    // optional offset.
-    RefPtr<SharedBuffer> pngData(SharedBuffer::create(&m_data->data()[dirEntry.m_imageOffset], m_data->size() - dirEntry.m_imageOffset));
-    m_pngDecoders[index]->setData(pngData.get(), isAllDataReceived());
-}
-
-void ICOImageDecoder::decode(size_t index, bool onlySize)
-{
-    if (failed())
-        return;
-
-    // If we couldn't decode the image but we've received all the data, decoding
-    // has failed.
-    if ((!decodeDirectory() || (!onlySize && !decodeAtIndex(index))) && isAllDataReceived())
-        setFailed();
-    // If we're done decoding this frame, we don't need the BMPImageReader or
-    // PNGImageDecoder anymore.  (If we failed, these have already been
-    // cleared.)
-    else if ((m_frameBufferCache.size() > index) && (m_frameBufferCache[index].status() == ImageFrame::FrameComplete)) {
-        m_bmpReaders[index].clear();
-        m_pngDecoders[index].clear();
-    }
-}
-
-bool ICOImageDecoder::decodeDirectory()
-{
-    // Read and process directory.
-    if ((m_decodedOffset < sizeOfDirectory) && !processDirectory())
-        return false;
-
-    // Read and process directory entries.
-    return (m_decodedOffset >= (sizeOfDirectory + (m_dirEntries.size() * sizeOfDirEntry))) || processDirectoryEntries();
-}
-
-bool ICOImageDecoder::decodeAtIndex(size_t index)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(index < m_dirEntries.size());
-    const IconDirectoryEntry& dirEntry = m_dirEntries[index];
-    const ImageType imageType = imageTypeAtIndex(index);
-    if (imageType == Unknown)
-        return false; // Not enough data to determine image type yet.
-
-    if (imageType == BMP) {
-        if (!m_bmpReaders[index]) {
-            // We need to have already sized m_frameBufferCache before this, and
-            // we must not resize it again later (see caution in frameCount()).
-            ASSERT(m_frameBufferCache.size() == m_dirEntries.size());
-            m_bmpReaders[index] = adoptPtr(new BMPImageReader(this, dirEntry.m_imageOffset, 0, true));
-            m_bmpReaders[index]->setData(m_data.get());
-            m_bmpReaders[index]->setBuffer(&m_frameBufferCache[index]);
-        }
-        m_frameSize = dirEntry.m_size;
-        bool result = m_bmpReaders[index]->decodeBMP(false);
-        m_frameSize = IntSize();
-        return result;
-    }
-
-    if (!m_pngDecoders[index]) {
-        m_pngDecoders[index] = adoptPtr(
-            new PNGImageDecoder(m_premultiplyAlpha ? ImageSource::AlphaPremultiplied : ImageSource::AlphaNotPremultiplied,
-                m_ignoreGammaAndColorProfile ? ImageSource::GammaAndColorProfileIgnored : ImageSource::GammaAndColorProfileApplied, m_maxDecodedBytes));
-        setDataForPNGDecoderAtIndex(index);
-    }
-    // Fail if the size the PNGImageDecoder calculated does not match the size
-    // in the directory.
-    if (m_pngDecoders[index]->isSizeAvailable() && (m_pngDecoders[index]->size() != dirEntry.m_size))
-        return setFailed();
-    m_frameBufferCache[index] = *m_pngDecoders[index]->frameBufferAtIndex(0);
-    m_frameBufferCache[index].setPremultiplyAlpha(m_premultiplyAlpha);
-    m_frameBufferCache[index].setRequiredPreviousFrameIndex(kNotFound);
-    return !m_pngDecoders[index]->failed() || setFailed();
-}
-
-bool ICOImageDecoder::processDirectory()
-{
-    // Read directory.
-    ASSERT(!m_decodedOffset);
-    if (m_data->size() < sizeOfDirectory)
-        return false;
-    const uint16_t fileType = readUint16(2);
-    const uint16_t idCount = readUint16(4);
-    m_decodedOffset = sizeOfDirectory;
-
-    // See if this is an icon filetype we understand, and make sure we have at
-    // least one entry in the directory.
-    if (((fileType != ICON) && (fileType != CURSOR)) || (!idCount))
-        return setFailed();
-
-    m_fileType = static_cast<FileType>(fileType);
-
-    // Enlarge member vectors to hold all the entries.
-    m_dirEntries.resize(idCount);
-    m_bmpReaders.resize(idCount);
-    m_pngDecoders.resize(idCount);
-    return true;
-}
-
-bool ICOImageDecoder::processDirectoryEntries()
-{
-    // Read directory entries.
-    ASSERT(m_decodedOffset == sizeOfDirectory);
-    if ((m_decodedOffset > m_data->size()) || ((m_data->size() - m_decodedOffset) < (m_dirEntries.size() * sizeOfDirEntry)))
-        return false;
-    for (IconDirectoryEntries::iterator i(m_dirEntries.begin()); i != m_dirEntries.end(); ++i)
-        *i = readDirectoryEntry();  // Updates m_decodedOffset.
-
-    // Make sure the specified image offsets are past the end of the directory
-    // entries.
-    for (IconDirectoryEntries::iterator i(m_dirEntries.begin()); i != m_dirEntries.end(); ++i) {
-        if (i->m_imageOffset < m_decodedOffset)
-            return setFailed();
-    }
-
-    // Arrange frames in decreasing quality order.
-    std::sort(m_dirEntries.begin(), m_dirEntries.end(), compareEntries);
-
-    // The image size is the size of the largest entry.
-    const IconDirectoryEntry& dirEntry = m_dirEntries.first();
-    // Technically, this next call shouldn't be able to fail, since the width
-    // and height here are each <= 256, and |m_frameSize| is empty.
-    return setSize(dirEntry.m_size.width(), dirEntry.m_size.height());
-}
-
-ICOImageDecoder::IconDirectoryEntry ICOImageDecoder::readDirectoryEntry()
-{
-    // Read icon data.
-    // The casts to uint8_t in the next few lines are because that's the on-disk
-    // type of the width and height values.  Storing them in ints (instead of
-    // matching uint8_ts) is so we can record dimensions of size 256 (which is
-    // what a zero byte really means).
-    int width = static_cast<uint8_t>(m_data->data()[m_decodedOffset]);
-    if (!width)
-        width = 256;
-    int height = static_cast<uint8_t>(m_data->data()[m_decodedOffset + 1]);
-    if (!height)
-        height = 256;
-    IconDirectoryEntry entry;
-    entry.m_size = IntSize(width, height);
-    if (m_fileType == CURSOR) {
-        entry.m_bitCount = 0;
-        entry.m_hotSpot = IntPoint(readUint16(4), readUint16(6));
-    } else {
-        entry.m_bitCount = readUint16(6);
-        entry.m_hotSpot = IntPoint();
-    }
-    entry.m_imageOffset = readUint32(12);
-
-    // Some icons don't have a bit depth, only a color count.  Convert the
-    // color count to the minimum necessary bit depth.  It doesn't matter if
-    // this isn't quite what the bitmap info header says later, as we only use
-    // this value to determine which icon entry is best.
-    if (!entry.m_bitCount) {
-        int colorCount = static_cast<uint8_t>(m_data->data()[m_decodedOffset + 2]);
-        if (!colorCount)
-            colorCount = 256;  // Vague in the spec, needed by real-world icons.
-        for (--colorCount; colorCount; colorCount >>= 1)
-            ++entry.m_bitCount;
-    }
-
-    m_decodedOffset += sizeOfDirEntry;
-    return entry;
-}
-
-ICOImageDecoder::ImageType ICOImageDecoder::imageTypeAtIndex(size_t index)
-{
-    // Check if this entry is a BMP or a PNG; we need 4 bytes to check the magic
-    // number.
-    ASSERT_WITH_SECURITY_IMPLICATION(index < m_dirEntries.size());
-    const uint32_t imageOffset = m_dirEntries[index].m_imageOffset;
-    if ((imageOffset > m_data->size()) || ((m_data->size() - imageOffset) < 4))
-        return Unknown;
-    return strncmp(&m_data->data()[imageOffset], "\x89PNG", 4) ? BMP : PNG;
-}
-
-}