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      1 /*
      2  * Copyright (C) 2012 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
      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. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #ifndef ContentLayerDelegate_h
     26 #define ContentLayerDelegate_h
     27 
     28 #include "platform/PlatformExport.h"
     29 #include "public/platform/WebContentLayerClient.h"
     30 #include "wtf/Noncopyable.h"
     31 #include "wtf/PassOwnPtr.h"
     32 
     33 class SkCanvas;
     34 
     35 namespace blink {
     36 
     37 class GraphicsContext;
     38 class IntRect;
     39 
     40 class PLATFORM_EXPORT GraphicsContextPainter {
     41 public:
     42     virtual void paint(GraphicsContext&, const IntRect& clip) = 0;
     43 
     44 protected:
     45     virtual ~GraphicsContextPainter() { }
     46 };
     47 
     48 class PLATFORM_EXPORT ContentLayerDelegate : public WebContentLayerClient {
     49     WTF_MAKE_NONCOPYABLE(ContentLayerDelegate);
     50 
     51 public:
     52     explicit ContentLayerDelegate(GraphicsContextPainter*);
     53     virtual ~ContentLayerDelegate();
     54 
     55     // When we know everything painted through this delegate will be opaque, allow for optimizations to take place.
     56     void setOpaque(bool opaque)
     57     {
     58         m_opaque = opaque;
     59     }
     60 
     61     // WebContentLayerClient implementation.
     62     virtual void paintContents(SkCanvas*, const WebRect& clip, bool canPaintLCDText, WebContentLayerClient::GraphicsContextStatus = GraphicsContextEnabled) OVERRIDE;
     63 
     64 private:
     65     GraphicsContextPainter* m_painter;
     66     bool m_opaque;
     67 };
     68 
     69 } // namespace blink
     70 
     71 #endif // ContentLayerDelegate_h
     72