Source/platform/graphics/ContentLayerDelegate.h

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef ContentLayerDelegate_h
#define ContentLayerDelegate_h

#include "platform/PlatformExport.h"
#include "public/platform/WebContentLayerClient.h"
#include "wtf/Noncopyable.h"
#include "wtf/PassOwnPtr.h"

class SkCanvas;

namespace blink {

class GraphicsContext;
class IntRect;

class PLATFORM_EXPORT GraphicsContextPainter {
public:
    virtual void paint(GraphicsContext&, const IntRect& clip) = 0;

protected:
    virtual ~GraphicsContextPainter() { }
};

class PLATFORM_EXPORT ContentLayerDelegate : public WebContentLayerClient {
    WTF_MAKE_NONCOPYABLE(ContentLayerDelegate);

public:
    explicit ContentLayerDelegate(GraphicsContextPainter*);
    virtual ~ContentLayerDelegate();

    // When we know everything painted through this delegate will be opaque, allow for optimizations to take place.
    void setOpaque(bool opaque)
    {
        m_opaque = opaque;
    }

    // WebContentLayerClient implementation.
    virtual void paintContents(SkCanvas*, const WebRect& clip, bool canPaintLCDText, WebContentLayerClient::GraphicsContextStatus = GraphicsContextEnabled) override;

private:
    GraphicsContextPainter* m_painter;
    bool m_opaque;
};

} // namespace blink

#endif // ContentLayerDelegate_h