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
34class SkData;
35
36namespace blink {
37
38class 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.
45class DecodingImageGenerator FINAL : public SkImageGenerator {
46public:
47    DecodingImageGenerator(PassRefPtr<ImageFrameGenerator>, const SkImageInfo&, size_t index);
48    virtual ~DecodingImageGenerator();
49
50    void setGenerationId(size_t id) { m_generationId = id; }
51
52protected:
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    virtual bool onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3], SkYUVColorSpace*) OVERRIDE;
57
58private:
59    RefPtr<ImageFrameGenerator> m_frameGenerator;
60    SkImageInfo m_imageInfo;
61    size_t m_frameIndex;
62    size_t m_generationId;
63};
64
65} // namespace blink
66
67#endif // DecodingImageGenerator_h_
68