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      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 
     40 class SkCanvas;
     41 class SkBitmap;
     42 
     43 namespace blink { class WebLayer; }
     44 
     45 namespace WebCore {
     46 
     47 class ImageBuffer;
     48 
     49 enum OpacityMode {
     50     NonOpaque,
     51     Opaque,
     52 };
     53 
     54 class PLATFORM_EXPORT ImageBufferSurface {
     55     WTF_MAKE_NONCOPYABLE(ImageBufferSurface); WTF_MAKE_FAST_ALLOCATED;
     56 public:
     57     virtual ~ImageBufferSurface() { }
     58 
     59     virtual SkCanvas* canvas() const = 0;
     60     virtual const SkBitmap& bitmap() const;
     61     virtual void willUse() { } // Called by ImageBuffer before reading or writing to the surface.
     62     virtual bool isValid() const = 0;
     63     virtual bool restore() { return false; };
     64     virtual blink::WebLayer* layer() const { return 0; };
     65     virtual bool isAccelerated() const { return false; }
     66     virtual Platform3DObject getBackingTexture() const { return 0; }
     67     virtual bool cachedBitmapEnabled() const { return false; }
     68     virtual const SkBitmap& cachedBitmap() const;
     69     virtual void invalidateCachedBitmap() { }
     70     virtual void updateCachedBitmapIfNeeded() { }
     71     virtual void setIsHidden(bool) { }
     72     virtual void setImageBuffer(ImageBuffer*) { }
     73 
     74     OpacityMode opacityMode() const { return m_opacityMode; }
     75     const IntSize& size() const { return m_size; }
     76     void notifyIsValidChanged(bool isValid) const;
     77 
     78 protected:
     79     ImageBufferSurface(const IntSize&, OpacityMode);
     80     void clear();
     81 
     82 private:
     83     OpacityMode m_opacityMode;
     84     IntSize m_size;
     85 };
     86 
     87 } // namespace WebCore
     88 
     89 #endif
     90