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      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 DeferredImageDecoder_h
     27 #define DeferredImageDecoder_h
     28 
     29 #include "SkBitmap.h"
     30 #include "platform/PlatformExport.h"
     31 #include "platform/geometry/IntSize.h"
     32 #include "platform/graphics/ImageFrameGenerator.h"
     33 #include "platform/graphics/ImageSource.h"
     34 #include "platform/image-decoders/ImageDecoder.h"
     35 #include "wtf/Forward.h"
     36 #include "wtf/OwnPtr.h"
     37 #include "wtf/Vector.h"
     38 
     39 namespace WebCore {
     40 
     41 class ImageFrameGenerator;
     42 class SharedBuffer;
     43 
     44 class PLATFORM_EXPORT DeferredImageDecoder {
     45     WTF_MAKE_NONCOPYABLE(DeferredImageDecoder);
     46 public:
     47     ~DeferredImageDecoder();
     48     static PassOwnPtr<DeferredImageDecoder> create(const SharedBuffer& data, ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption);
     49 
     50     static PassOwnPtr<DeferredImageDecoder> createForTesting(PassOwnPtr<ImageDecoder>);
     51 
     52     static bool isLazyDecoded(const SkBitmap&);
     53 
     54     static void setEnabled(bool);
     55     static bool enabled();
     56 
     57     String filenameExtension() const;
     58 
     59     ImageFrame* frameBufferAtIndex(size_t index);
     60 
     61     void setData(SharedBuffer& data, bool allDataReceived);
     62 
     63     bool isSizeAvailable();
     64     bool hasColorProfile() const;
     65     IntSize size() const;
     66     IntSize frameSizeAtIndex(size_t index) const;
     67     size_t frameCount();
     68     int repetitionCount() const;
     69     size_t clearCacheExceptFrame(size_t);
     70     bool frameHasAlphaAtIndex(size_t index) const;
     71     bool frameIsCompleteAtIndex(size_t) const;
     72     float frameDurationAtIndex(size_t) const;
     73     unsigned frameBytesAtIndex(size_t index) const;
     74     ImageOrientation orientation() const;
     75     bool hotSpot(IntPoint&) const;
     76 
     77     // For testing.
     78     ImageFrameGenerator* frameGenerator() { return m_frameGenerator.get(); }
     79 
     80 private:
     81     explicit DeferredImageDecoder(PassOwnPtr<ImageDecoder> actualDecoder);
     82     void prepareLazyDecodedFrames();
     83     SkBitmap createBitmap(size_t index);
     84     void activateLazyDecoding();
     85 
     86     RefPtr<SharedBuffer> m_data;
     87     bool m_allDataReceived;
     88     unsigned m_lastDataSize;
     89     bool m_dataChanged;
     90     OwnPtr<ImageDecoder> m_actualDecoder;
     91 
     92     String m_filenameExtension;
     93     IntSize m_size;
     94     ImageOrientation m_orientation;
     95     int m_repetitionCount;
     96     bool m_hasColorProfile;
     97 
     98     Vector<OwnPtr<ImageFrame> > m_lazyDecodedFrames;
     99     RefPtr<ImageFrameGenerator> m_frameGenerator;
    100 
    101     static bool s_enabled;
    102 };
    103 
    104 } // namespace WebCore
    105 
    106 #endif
    107