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 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 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 "FloatSize.h"
30#include "GeneratedImage.h"
31#include "Image.h"
32#include "ImageObserver.h"
33#include <wtf/RefPtr.h>
34
35namespace WebCore {
36
37class CSSCrossfadeValue;
38
39class CrossfadeGeneratedImage final : public GeneratedImage {
40public:
41    static PassRefPtr<CrossfadeGeneratedImage> create(Image* fromImage, Image* toImage, float percentage, const FloatSize& crossfadeSize, const FloatSize& size)
42    {
43        return adoptRef(new CrossfadeGeneratedImage(fromImage, toImage, percentage, crossfadeSize, size));
44    }
45
46    virtual void setContainerSize(const FloatSize&) override { }
47    virtual bool usesContainerSize() const override { return false; }
48    virtual bool hasRelativeWidth() const override { return false; }
49    virtual bool hasRelativeHeight() const override { return false; }
50
51    virtual FloatSize size() const override { return m_crossfadeSize; }
52
53protected:
54    virtual void draw(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, ColorSpace styleColorSpace, CompositeOperator, BlendMode, ImageOrientationDescription) override;
55    virtual void drawPattern(GraphicsContext*, const FloatRect& srcRect, const AffineTransform& patternTransform, const FloatPoint& phase, ColorSpace styleColorSpace, CompositeOperator, const FloatRect& dstRect, BlendMode) override;
56
57    CrossfadeGeneratedImage(Image* fromImage, Image* toImage, float percentage, const FloatSize& crossfadeSize, const FloatSize&);
58
59private:
60    void drawCrossfade(GraphicsContext*);
61
62    Image* m_fromImage;
63    Image* m_toImage;
64
65    float m_percentage;
66    FloatSize m_crossfadeSize;
67};
68
69}
70
71#endif
72