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      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 
     35 namespace blink {
     36 
     37 class PLATFORM_EXPORT CrossfadeGeneratedImage : public GeneratedImage {
     38 public:
     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 
     51 protected:
     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 
     60 private:
     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