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 are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef ImageBufferSurface_h
32#define ImageBufferSurface_h
33
34#include "platform/PlatformExport.h"
35#include "platform/geometry/IntSize.h"
36#include "platform/graphics/GraphicsTypes3D.h"
37#include "wtf/FastAllocBase.h"
38#include "wtf/Noncopyable.h"
39#include "wtf/PassRefPtr.h"
40
41class SkBitmap;
42class SkCanvas;
43class SkPicture;
44
45namespace blink {
46
47class ImageBuffer;
48class WebLayer;
49class FloatRect;
50
51enum OpacityMode {
52    NonOpaque,
53    Opaque,
54};
55
56class PLATFORM_EXPORT ImageBufferSurface {
57    WTF_MAKE_NONCOPYABLE(ImageBufferSurface); WTF_MAKE_FAST_ALLOCATED;
58public:
59    virtual ~ImageBufferSurface() { }
60
61    virtual SkCanvas* canvas() const = 0;
62    virtual const SkBitmap& bitmap();
63    virtual void willAccessPixels() { }
64    virtual bool isValid() const = 0;
65    virtual bool restore() { return false; };
66    virtual WebLayer* layer() const { return 0; };
67    virtual bool isAccelerated() const { return false; }
68    virtual Platform3DObject getBackingTexture() const { return 0; }
69    virtual void didModifyBackingTexture() { }
70    virtual bool cachedBitmapEnabled() const { return false; }
71    virtual const SkBitmap& cachedBitmap() const;
72    virtual void invalidateCachedBitmap() { }
73    virtual void updateCachedBitmapIfNeeded() { }
74    virtual void setIsHidden(bool) { }
75    virtual void setImageBuffer(ImageBuffer*) { }
76    virtual PassRefPtr<SkPicture> getPicture();
77    virtual void didClearCanvas() { }
78    virtual void finalizeFrame(const FloatRect &dirtyRect) { }
79
80    OpacityMode opacityMode() const { return m_opacityMode; }
81    const IntSize& size() const { return m_size; }
82    void notifyIsValidChanged(bool isValid) const;
83
84protected:
85    ImageBufferSurface(const IntSize&, OpacityMode);
86    void clear();
87
88private:
89    OpacityMode m_opacityMode;
90    IntSize m_size;
91};
92
93} // namespace blink
94
95#endif
96