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 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef LazyDecodingPixelRef_h 27 #define LazyDecodingPixelRef_h 28 29 #include "SkFlattenableBuffers.h" 30 #include "SkPixelRef.h" 31 #include "SkRect.h" 32 #include "SkSize.h" 33 #include "SkTypes.h" 34 #include "platform/PlatformInstrumentation.h" 35 #include "skia/ext/lazy_pixel_ref.h" 36 37 #include "wtf/RefPtr.h" 38 39 using skia::LazyPixelRef; 40 41 class SkData; 42 43 namespace WebCore { 44 45 class ImageFrameGenerator; 46 class ScaledImageFragment; 47 48 class LazyDecodingPixelRef FINAL : public LazyPixelRef { 49 public: 50 LazyDecodingPixelRef(const SkImageInfo&, PassRefPtr<ImageFrameGenerator>, size_t index); 51 virtual ~LazyDecodingPixelRef(); 52 SK_DECLARE_UNFLATTENABLE_OBJECT()53 SK_DECLARE_UNFLATTENABLE_OBJECT() 54 55 PassRefPtr<ImageFrameGenerator> frameGenerator() const { return m_frameGenerator; } frameIndex()56 size_t frameIndex() const { return m_frameIndex; } 57 58 // Returns true if the image might already be decoded in the cache. 59 // Optimistic version of PrepareToDecode; requires less locking. 60 virtual bool MaybeDecoded() OVERRIDE; 61 virtual bool PrepareToDecode(const LazyPixelRef::PrepareParams&) OVERRIDE; 62 virtual void Decode() OVERRIDE; 63 64 protected: 65 // SkPixelRef implementation. 66 virtual bool onNewLockPixels(LockRec*) OVERRIDE; 67 virtual void onUnlockPixels() OVERRIDE; 68 virtual bool onLockPixelsAreWritable() const OVERRIDE; 69 70 virtual SkData* onRefEncodedData() OVERRIDE; 71 72 private: 73 RefPtr<ImageFrameGenerator> m_frameGenerator; 74 size_t m_frameIndex; 75 76 const ScaledImageFragment* m_lockedImageResource; 77 PlatformInstrumentation::LazyPixelRefTracker m_objectTracker; 78 }; 79 80 } // namespace WebCore 81 82 #endif // LazyDecodingPixelRef_h_ 83