| /* |
| * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 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 |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "platform/image-decoders/ImageDecoder.h" |
| |
| #include "platform/image-decoders/bmp/BMPImageDecoder.h" |
| #include "platform/image-decoders/gif/GIFImageDecoder.h" |
| #include "platform/image-decoders/ico/ICOImageDecoder.h" |
| #include "platform/image-decoders/jpeg/JPEGImageDecoder.h" |
| #include "platform/image-decoders/png/PNGImageDecoder.h" |
| #include "sky/engine/platform/graphics/DeferredImageDecoder.h" |
| #include "sky/engine/wtf/PassOwnPtr.h" |
| |
| namespace blink { |
| |
| static unsigned copyFromSharedBuffer(char* buffer, unsigned bufferLength, const SharedBuffer& sharedBuffer, unsigned offset) |
| { |
| unsigned bytesExtracted = 0; |
| const char* moreData; |
| while (unsigned moreDataLength = sharedBuffer.getSomeData(moreData, offset)) { |
| unsigned bytesToCopy = std::min(bufferLength - bytesExtracted, moreDataLength); |
| memcpy(buffer + bytesExtracted, moreData, bytesToCopy); |
| bytesExtracted += bytesToCopy; |
| if (bytesExtracted == bufferLength) |
| break; |
| offset += bytesToCopy; |
| } |
| return bytesExtracted; |
| } |
| |
| inline bool matchesGIFSignature(char* contents) |
| { |
| return !memcmp(contents, "GIF87a", 6) || !memcmp(contents, "GIF89a", 6); |
| } |
| |
| inline bool matchesPNGSignature(char* contents) |
| { |
| return !memcmp(contents, "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A", 8); |
| } |
| |
| inline bool matchesJPEGSignature(char* contents) |
| { |
| return !memcmp(contents, "\xFF\xD8\xFF", 3); |
| } |
| |
| inline bool matchesBMPSignature(char* contents) |
| { |
| return !memcmp(contents, "BM", 2); |
| } |
| |
| inline bool matchesICOSignature(char* contents) |
| { |
| return !memcmp(contents, "\x00\x00\x01\x00", 4); |
| } |
| |
| inline bool matchesCURSignature(char* contents) |
| { |
| return !memcmp(contents, "\x00\x00\x02\x00", 4); |
| } |
| |
| PassOwnPtr<ImageDecoder> ImageDecoder::create(const SharedBuffer& data, ImageSource::AlphaOption alphaOption, ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption) |
| { |
| static const unsigned longestSignatureLength = sizeof("RIFF????WEBPVP") - 1; |
| ASSERT(longestSignatureLength == 14); |
| |
| size_t maxDecodedBytes = blink::Platform::current()->maxDecodedImageBytes(); |
| |
| char contents[longestSignatureLength]; |
| if (copyFromSharedBuffer(contents, longestSignatureLength, data, 0) < longestSignatureLength) |
| return nullptr; |
| |
| if (matchesJPEGSignature(contents)) |
| return adoptPtr(new JPEGImageDecoder(alphaOption, gammaAndColorProfileOption, maxDecodedBytes)); |
| |
| if (matchesPNGSignature(contents)) |
| return adoptPtr(new PNGImageDecoder(alphaOption, gammaAndColorProfileOption, maxDecodedBytes)); |
| |
| if (matchesGIFSignature(contents)) |
| return adoptPtr(new GIFImageDecoder(alphaOption, gammaAndColorProfileOption, maxDecodedBytes)); |
| |
| if (matchesICOSignature(contents) || matchesCURSignature(contents)) |
| return adoptPtr(new ICOImageDecoder(alphaOption, gammaAndColorProfileOption, maxDecodedBytes)); |
| |
| if (matchesBMPSignature(contents)) |
| return adoptPtr(new BMPImageDecoder(alphaOption, gammaAndColorProfileOption, maxDecodedBytes)); |
| |
| return nullptr; |
| } |
| |
| bool ImageDecoder::frameHasAlphaAtIndex(size_t index) const |
| { |
| return !frameIsCompleteAtIndex(index) || m_frameBufferCache[index].hasAlpha(); |
| } |
| |
| bool ImageDecoder::frameIsCompleteAtIndex(size_t index) const |
| { |
| return (index < m_frameBufferCache.size()) && |
| (m_frameBufferCache[index].status() == ImageFrame::FrameComplete); |
| } |
| |
| unsigned ImageDecoder::frameBytesAtIndex(size_t index) const |
| { |
| if (m_frameBufferCache.size() <= index || m_frameBufferCache[index].status() == ImageFrame::FrameEmpty) |
| return 0; |
| // FIXME: Use the dimension of the requested frame. |
| return m_size.area() * sizeof(ImageFrame::PixelData); |
| } |
| |
| bool ImageDecoder::deferredImageDecodingEnabled() |
| { |
| return DeferredImageDecoder::enabled(); |
| } |
| |
| size_t ImageDecoder::clearCacheExceptFrame(size_t clearExceptFrame) |
| { |
| // Don't clear if there are no frames or only one frame. |
| if (m_frameBufferCache.size() <= 1) |
| return 0; |
| |
| size_t frameBytesCleared = 0; |
| for (size_t i = 0; i < m_frameBufferCache.size(); ++i) { |
| if (i != clearExceptFrame) { |
| frameBytesCleared += frameBytesAtIndex(i); |
| clearFrameBuffer(i); |
| } |
| } |
| return frameBytesCleared; |
| } |
| |
| void ImageDecoder::clearFrameBuffer(size_t frameIndex) |
| { |
| m_frameBufferCache[frameIndex].clearPixelData(); |
| } |
| |
| size_t ImageDecoder::findRequiredPreviousFrame(size_t frameIndex, bool frameRectIsOpaque) |
| { |
| ASSERT(frameIndex <= m_frameBufferCache.size()); |
| if (!frameIndex) { |
| // The first frame doesn't rely on any previous data. |
| return kNotFound; |
| } |
| |
| const ImageFrame* currBuffer = &m_frameBufferCache[frameIndex]; |
| if ((frameRectIsOpaque || currBuffer->alphaBlendSource() == ImageFrame::BlendAtopBgcolor) |
| && currBuffer->originalFrameRect().contains(IntRect(IntPoint(), size()))) |
| return kNotFound; |
| |
| // The starting state for this frame depends on the previous frame's |
| // disposal method. |
| size_t prevFrame = frameIndex - 1; |
| const ImageFrame* prevBuffer = &m_frameBufferCache[prevFrame]; |
| ASSERT(prevBuffer->requiredPreviousFrameIndexValid()); |
| |
| switch (prevBuffer->disposalMethod()) { |
| case ImageFrame::DisposeNotSpecified: |
| case ImageFrame::DisposeKeep: |
| // prevFrame will be used as the starting state for this frame. |
| // FIXME: Be even smarter by checking the frame sizes and/or alpha-containing regions. |
| return prevFrame; |
| case ImageFrame::DisposeOverwritePrevious: |
| // Frames that use the DisposeOverwritePrevious method are effectively |
| // no-ops in terms of changing the starting state of a frame compared to |
| // the starting state of the previous frame, so skip over them and |
| // return the required previous frame of it. |
| return prevBuffer->requiredPreviousFrameIndex(); |
| case ImageFrame::DisposeOverwriteBgcolor: |
| // If the previous frame fills the whole image, then the current frame |
| // can be decoded alone. Likewise, if the previous frame could be |
| // decoded without reference to any prior frame, the starting state for |
| // this frame is a blank frame, so it can again be decoded alone. |
| // Otherwise, the previous frame contributes to this frame. |
| return (prevBuffer->originalFrameRect().contains(IntRect(IntPoint(), size())) |
| || (prevBuffer->requiredPreviousFrameIndex() == kNotFound)) ? kNotFound : prevFrame; |
| default: |
| ASSERT_NOT_REACHED(); |
| return kNotFound; |
| } |
| } |
| |
| ImagePlanes::ImagePlanes() |
| { |
| for (int i = 0; i < 3; ++i) { |
| m_planes[i] = 0; |
| m_rowBytes[i] = 0; |
| } |
| } |
| |
| ImagePlanes::ImagePlanes(void* planes[3], size_t rowBytes[3]) |
| { |
| for (int i = 0; i < 3; ++i) { |
| m_planes[i] = planes[i]; |
| m_rowBytes[i] = rowBytes[i]; |
| } |
| } |
| |
| void* ImagePlanes::plane(int i) |
| { |
| ASSERT((i >= 0) && i < 3); |
| return m_planes[i]; |
| } |
| |
| size_t ImagePlanes::rowBytes(int i) const |
| { |
| ASSERT((i >= 0) && i < 3); |
| return m_rowBytes[i]; |
| } |
| |
| } // namespace blink |