1/*
2 * Copyright (C) 2011 Apple 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 CrossfadeGeneratedImage_h
27#define CrossfadeGeneratedImage_h
28
29#include "platform/geometry/IntSize.h"
30#include "platform/graphics/GeneratedImage.h"
31#include "platform/graphics/Image.h"
32#include "platform/graphics/ImageObserver.h"
33#include "wtf/RefPtr.h"
34
35namespace blink {
36
37class PLATFORM_EXPORT CrossfadeGeneratedImage : public GeneratedImage {
38public:
39    static PassRefPtr<CrossfadeGeneratedImage> create(Image* fromImage, Image* toImage, float percentage, IntSize crossfadeSize, const IntSize& size)
40    {
41        return adoptRef(new CrossfadeGeneratedImage(fromImage, toImage, percentage, crossfadeSize, size));
42    }
43
44    virtual void setContainerSize(const IntSize&) OVERRIDE { }
45    virtual bool usesContainerSize() const OVERRIDE { return false; }
46    virtual bool hasRelativeWidth() const OVERRIDE { return false; }
47    virtual bool hasRelativeHeight() const OVERRIDE { return false; }
48
49    virtual IntSize size() const OVERRIDE { return m_crossfadeSize; }
50
51protected:
52    virtual void draw(GraphicsContext*, const FloatRect&, const FloatRect&,
53        CompositeOperator, WebBlendMode) OVERRIDE;
54    virtual void drawPattern(GraphicsContext*, const FloatRect&,
55        const FloatSize&, const FloatPoint&, CompositeOperator,
56        const FloatRect&, WebBlendMode, const IntSize& repeatSpacing) OVERRIDE;
57
58    CrossfadeGeneratedImage(Image* fromImage, Image* toImage, float percentage, IntSize crossfadeSize, const IntSize&);
59
60private:
61    void drawCrossfade(GraphicsContext*);
62
63    Image* m_fromImage;
64    Image* m_toImage;
65
66    float m_percentage;
67    IntSize m_crossfadeSize;
68};
69
70} // namespace blink
71
72#endif
73