1 /* 2 * Copyright (C) 2012 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef ImageFrameGenerator_h 27 #define ImageFrameGenerator_h 28 29 #include "SkBitmap.h" 30 #include "SkSize.h" 31 #include "SkTypes.h" 32 #include "platform/PlatformExport.h" 33 #include "platform/graphics/ThreadSafeDataTransport.h" 34 #include "wtf/PassOwnPtr.h" 35 #include "wtf/PassRefPtr.h" 36 #include "wtf/RefCounted.h" 37 #include "wtf/RefPtr.h" 38 #include "wtf/ThreadingPrimitives.h" 39 #include "wtf/ThreadSafeRefCounted.h" 40 #include "wtf/Vector.h" 41 42 namespace blink { 43 44 class ImageDecoder; 45 class ImagePlanes; 46 class SharedBuffer; 47 48 class PLATFORM_EXPORT ImageDecoderFactory { 49 WTF_MAKE_NONCOPYABLE(ImageDecoderFactory); 50 public: 51 ImageDecoderFactory() {} 52 virtual ~ImageDecoderFactory() { } 53 virtual PassOwnPtr<ImageDecoder> create() = 0; 54 }; 55 56 class PLATFORM_EXPORT ImageFrameGenerator : public ThreadSafeRefCounted<ImageFrameGenerator> { 57 WTF_MAKE_NONCOPYABLE(ImageFrameGenerator); 58 public: 59 static PassRefPtr<ImageFrameGenerator> create(const SkISize& fullSize, PassRefPtr<SharedBuffer> data, bool allDataReceived, bool isMultiFrame = false) 60 { 61 return adoptRef(new ImageFrameGenerator(fullSize, data, allDataReceived, isMultiFrame)); 62 } 63 64 ImageFrameGenerator(const SkISize& fullSize, PassRefPtr<SharedBuffer>, bool allDataReceived, bool isMultiFrame); 65 ~ImageFrameGenerator(); 66 67 // Decodes and scales the specified frame indicated by |index|. Dimensions 68 // and output format are specified in |info|. Decoded pixels are written 69 // into |pixels| with a stride of |rowBytes|. 70 // 71 // Returns true if decoding was successful. 72 bool decodeAndScale(const SkImageInfo&, size_t index, void* pixels, size_t rowBytes); 73 74 // Decodes YUV components directly into the provided memory planes. 75 bool decodeToYUV(SkISize componentSizes[3], void* planes[3], size_t rowBytes[3]); 76 77 void setData(PassRefPtr<SharedBuffer>, bool allDataReceived); 78 79 // Creates a new SharedBuffer containing the data received so far. 80 void copyData(RefPtr<SharedBuffer>*, bool* allDataReceived); 81 82 SkISize getFullSize() const { return m_fullSize; } 83 84 bool isMultiFrame() const { return m_isMultiFrame; } 85 86 // FIXME: Return alpha state for each frame. 87 bool hasAlpha(size_t); 88 89 bool getYUVComponentSizes(SkISize componentSizes[3]); 90 91 private: 92 class ExternalMemoryAllocator; 93 friend class ImageFrameGeneratorTest; 94 friend class DeferredImageDecoderTest; 95 // For testing. |factory| will overwrite the default ImageDecoder creation logic if |factory->create()| returns non-zero. 96 void setImageDecoderFactory(PassOwnPtr<ImageDecoderFactory> factory) { m_imageDecoderFactory = factory; } 97 98 void setHasAlpha(size_t index, bool hasAlpha); 99 100 // These methods are called while m_decodeMutex is locked. 101 SkBitmap tryToResumeDecode(const SkISize& scaledSize, size_t index); 102 103 // Use the given decoder to decode. If a decoder is not given then try to create one. 104 // Returns true if decoding was complete. 105 bool decode(size_t index, ImageDecoder**, SkBitmap*); 106 107 SkISize m_fullSize; 108 ThreadSafeDataTransport m_data; 109 bool m_isMultiFrame; 110 bool m_decodeFailedAndEmpty; 111 Vector<bool> m_hasAlpha; 112 int m_decodeCount; 113 OwnPtr<ExternalMemoryAllocator> m_externalAllocator; 114 115 OwnPtr<ImageDecoderFactory> m_imageDecoderFactory; 116 117 // Prevents multiple decode operations on the same data. 118 Mutex m_decodeMutex; 119 120 // Protect concurrent access to m_hasAlpha. 121 Mutex m_alphaMutex; 122 }; 123 124 } // namespace blink 125 126 #endif 127