diff options
Diffstat (limited to 'WebCore/platform/image-decoders/ico/ICOImageDecoder.cpp')
| -rw-r--r-- | WebCore/platform/image-decoders/ico/ICOImageDecoder.cpp | 315 |
1 files changed, 0 insertions, 315 deletions
diff --git a/WebCore/platform/image-decoders/ico/ICOImageDecoder.cpp b/WebCore/platform/image-decoders/ico/ICOImageDecoder.cpp deleted file mode 100644 index 92a7dcf..0000000 --- a/WebCore/platform/image-decoders/ico/ICOImageDecoder.cpp +++ /dev/null @@ -1,315 +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 "ICOImageDecoder.h" - -#include <algorithm> - -#include "BMPImageReader.h" -#include "PNGImageDecoder.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) - : ImageDecoder(alphaOption, gammaAndColorProfileOption) - , 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); - } - // 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(); -} - -RGBA32Buffer* ICOImageDecoder::frameBufferAtIndex(size_t index) -{ - // Ensure |index| is valid. - if (index >= frameCount()) - return 0; - - RGBA32Buffer* buffer = &m_frameBufferCache[index]; - if (buffer->status() != RGBA32Buffer::FrameComplete) - decode(index, false); - return buffer; -} - -bool ICOImageDecoder::setFailed() -{ - m_bmpReaders.clear(); - m_pngDecoders.clear(); - return ImageDecoder::setFailed(); -} - -// 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() == RGBA32Buffer::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(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].set(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].set( - new PNGImageDecoder(m_premultiplyAlpha ? ImageSource::AlphaPremultiplied : ImageSource::AlphaNotPremultiplied, - m_ignoreGammaAndColorProfile ? ImageSource::GammaAndColorProfileIgnored : ImageSource::GammaAndColorProfileApplied)); - 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); - 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. - enum { - ICON = 1, - CURSOR = 2, - }; - if (((fileType != ICON) && (fileType != CURSOR)) || (!idCount)) - return setFailed(); - - // 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); - entry.m_bitCount = readUint16(6); - 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(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; -} - -} |