| /* |
| * Copyright (C) 2012 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. 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. |
| */ |
| |
| #ifndef ImageFrameGenerator_h |
| #define ImageFrameGenerator_h |
| |
| #include "SkBitmap.h" |
| #include "SkSize.h" |
| #include "SkTypes.h" |
| #include "platform/PlatformExport.h" |
| #include "platform/graphics/ThreadSafeDataTransport.h" |
| #include "wtf/PassOwnPtr.h" |
| #include "wtf/PassRefPtr.h" |
| #include "wtf/RefCounted.h" |
| #include "wtf/RefPtr.h" |
| #include "wtf/ThreadingPrimitives.h" |
| #include "wtf/ThreadSafeRefCounted.h" |
| #include "wtf/Vector.h" |
| |
| namespace blink { |
| |
| class ImageDecoder; |
| class ScaledImageFragment; |
| class SharedBuffer; |
| |
| class PLATFORM_EXPORT ImageDecoderFactory { |
| WTF_MAKE_NONCOPYABLE(ImageDecoderFactory); |
| public: |
| ImageDecoderFactory() {} |
| virtual ~ImageDecoderFactory() { } |
| virtual PassOwnPtr<ImageDecoder> create() = 0; |
| }; |
| |
| class PLATFORM_EXPORT ImageFrameGenerator : public ThreadSafeRefCounted<ImageFrameGenerator> { |
| WTF_MAKE_NONCOPYABLE(ImageFrameGenerator); |
| public: |
| static PassRefPtr<ImageFrameGenerator> create(const SkISize& fullSize, PassRefPtr<SharedBuffer> data, bool allDataReceived, bool isMultiFrame = false) |
| { |
| return adoptRef(new ImageFrameGenerator(fullSize, data, allDataReceived, isMultiFrame)); |
| } |
| |
| ImageFrameGenerator(const SkISize& fullSize, PassRefPtr<SharedBuffer>, bool allDataReceived, bool isMultiFrame); |
| ~ImageFrameGenerator(); |
| |
| const ScaledImageFragment* decodeAndScale(const SkISize& scaledSize, size_t index = 0); |
| |
| // Decodes and scales the specified frame indicated by |index|. Dimensions |
| // and output format are specified in |info|. Decoded pixels are written |
| // into |pixels| with a stride of |rowBytes|. |
| // |
| // Returns true if decoding was successful. |
| bool decodeAndScale(const SkImageInfo&, size_t index, void* pixels, size_t rowBytes); |
| |
| void setData(PassRefPtr<SharedBuffer>, bool allDataReceived); |
| |
| // Creates a new SharedBuffer containing the data received so far. |
| void copyData(RefPtr<SharedBuffer>*, bool* allDataReceived); |
| |
| SkISize getFullSize() const { return m_fullSize; } |
| |
| bool isMultiFrame() const { return m_isMultiFrame; } |
| |
| // FIXME: Return alpha state for each frame. |
| bool hasAlpha(size_t); |
| |
| private: |
| class ExternalMemoryAllocator; |
| friend class ImageFrameGeneratorTest; |
| friend class DeferredImageDecoderTest; |
| // For testing. |factory| will overwrite the default ImageDecoder creation logic if |factory->create()| returns non-zero. |
| void setImageDecoderFactory(PassOwnPtr<ImageDecoderFactory> factory) { m_imageDecoderFactory = factory; } |
| // For testing. |
| SkBitmap::Allocator* allocator() const { return m_discardableAllocator.get(); } |
| void setAllocator(PassOwnPtr<SkBitmap::Allocator> allocator) { m_discardableAllocator = allocator; } |
| |
| // These methods are called while m_decodeMutex is locked. |
| const ScaledImageFragment* tryToLockCompleteCache(const SkISize& scaledSize, size_t index); |
| const ScaledImageFragment* tryToResumeDecode(const SkISize& scaledSize, size_t index); |
| |
| // Use the given decoder to decode. If a decoder is not given then try to create one. |
| PassOwnPtr<ScaledImageFragment> decode(size_t index, ImageDecoder**); |
| |
| // Return the next generation ID of a new image object. This is used |
| // to identify images of the same frame from different stages of |
| // progressive decode. |
| size_t nextGenerationId() { return m_decodeCount++; } |
| |
| SkISize m_fullSize; |
| ThreadSafeDataTransport m_data; |
| bool m_isMultiFrame; |
| bool m_decodeFailedAndEmpty; |
| Vector<bool> m_hasAlpha; |
| size_t m_decodeCount; |
| OwnPtr<SkBitmap::Allocator> m_discardableAllocator; |
| OwnPtr<ExternalMemoryAllocator> m_externalAllocator; |
| |
| OwnPtr<ImageDecoderFactory> m_imageDecoderFactory; |
| |
| // Prevents multiple decode operations on the same data. |
| Mutex m_decodeMutex; |
| |
| // Protect concurrent access to m_hasAlpha. |
| Mutex m_alphaMutex; |
| }; |
| |
| } // namespace blink |
| |
| #endif |