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      1 /*
      2  * Copyright (C) 2008, 2012 Apple Computer, 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 GeneratorGeneratedImage_h
     27 #define GeneratorGeneratedImage_h
     28 
     29 #include "core/platform/Timer.h"
     30 #include "core/platform/graphics/GeneratedImage.h"
     31 #include "core/platform/graphics/Gradient.h"
     32 #include "core/platform/graphics/Image.h"
     33 #include "core/platform/graphics/ImageBuffer.h"
     34 #include "core/platform/graphics/IntSize.h"
     35 #include "wtf/RefPtr.h"
     36 
     37 namespace WebCore {
     38 
     39 static const int generatedImageCacheClearDelay = 1;
     40 
     41 class GeneratorGeneratedImage : public GeneratedImage {
     42 public:
     43     static PassRefPtr<GeneratorGeneratedImage> create(PassRefPtr<Gradient> generator, const IntSize& size)
     44     {
     45         return adoptRef(new GeneratorGeneratedImage(generator, size));
     46     }
     47 
     48     virtual ~GeneratorGeneratedImage()
     49     {
     50         m_cacheTimer.stop();
     51     }
     52 
     53 protected:
     54     virtual void draw(GraphicsContext*, const FloatRect&, const FloatRect&,
     55         CompositeOperator, BlendMode) OVERRIDE;
     56     virtual void drawPattern(GraphicsContext*, const FloatRect&,
     57         const FloatSize&, const FloatPoint&, CompositeOperator,
     58         const FloatRect&, BlendMode) OVERRIDE;
     59 
     60     void drawPatternWithoutCache(GraphicsContext*, const FloatRect&, const FloatSize&,
     61         const FloatPoint&, CompositeOperator, const FloatRect&, BlendMode);
     62 
     63     void invalidateCacheTimerFired(DeferrableOneShotTimer<GeneratorGeneratedImage>*);
     64 
     65     GeneratorGeneratedImage(PassRefPtr<Gradient> generator, const IntSize& size)
     66         : m_gradient(generator)
     67         , m_cacheTimer(this, &GeneratorGeneratedImage::invalidateCacheTimerFired, generatedImageCacheClearDelay)
     68     {
     69         m_size = size;
     70     }
     71 
     72     RefPtr<Gradient> m_gradient;
     73 
     74     OwnPtr<ImageBuffer> m_cachedImageBuffer;
     75     DeferrableOneShotTimer<GeneratorGeneratedImage> m_cacheTimer;
     76     IntSize m_cachedAdjustedSize;
     77     unsigned m_cachedGeneratorHash;
     78 };
     79 
     80 }
     81 
     82 #endif
     83