1 /* 2 * Copyright (C) 2013 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 DecodingImageGenerator_h 27 #define DecodingImageGenerator_h 28 29 #include "SkImageGenerator.h" 30 #include "SkImageInfo.h" 31 32 #include "wtf/RefPtr.h" 33 34 class SkData; 35 36 namespace WebCore { 37 38 class ImageFrameGenerator; 39 40 // Implements SkImageGenerator and used by SkPixelRef to populate a discardable 41 // memory with decoded pixels. 42 // 43 // This class does not own an ImageDecode. It does not own encoded data. It serves 44 // as and adapter to ImageFrameGenerator which actually performs decoding. 45 class DecodingImageGenerator FINAL : public SkImageGenerator { 46 public: 47 DecodingImageGenerator(PassRefPtr<ImageFrameGenerator>, const SkImageInfo&, size_t index); 48 virtual ~DecodingImageGenerator(); 49 setGenerationId(size_t id)50 void setGenerationId(size_t id) { m_generationId = id; } 51 52 protected: 53 virtual SkData* onRefEncodedData() OVERRIDE; 54 virtual bool onGetInfo(SkImageInfo*) OVERRIDE; 55 virtual bool onGetPixels(const SkImageInfo&, void* pixels, size_t rowBytes, SkPMColor ctable[], int* ctableCount) OVERRIDE; 56 57 private: 58 RefPtr<ImageFrameGenerator> m_frameGenerator; 59 SkImageInfo m_imageInfo; 60 size_t m_frameIndex; 61 size_t m_generationId; 62 }; 63 64 } // namespace WebCore 65 66 #endif // DecodingImageGenerator_h_ 67