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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 INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef LayerTreeHost_h
     27 #define LayerTreeHost_h
     28 
     29 #include <wtf/PassRefPtr.h>
     30 #include <wtf/RefCounted.h>
     31 
     32 namespace WebCore {
     33     class IntRect;
     34     class IntSize;
     35     class GraphicsLayer;
     36 }
     37 
     38 namespace WebKit {
     39 
     40 class LayerTreeContext;
     41 class UpdateInfo;
     42 class WebPage;
     43 
     44 class LayerTreeHost : public RefCounted<LayerTreeHost> {
     45 public:
     46     static PassRefPtr<LayerTreeHost> create(WebPage*);
     47     virtual ~LayerTreeHost();
     48 
     49     static bool supportsAcceleratedCompositing();
     50 
     51     virtual const LayerTreeContext& layerTreeContext() = 0;
     52     virtual void scheduleLayerFlush() = 0;
     53     virtual void setShouldNotifyAfterNextScheduledLayerFlush(bool) = 0;
     54     virtual void setRootCompositingLayer(WebCore::GraphicsLayer*) = 0;
     55     virtual void invalidate() = 0;
     56 
     57     virtual void setNonCompositedContentsNeedDisplay(const WebCore::IntRect&) = 0;
     58     virtual void scrollNonCompositedContents(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollOffset) = 0;
     59     virtual void forceRepaint() = 0;
     60     virtual void sizeDidChange(const WebCore::IntSize& newSize) = 0;
     61 
     62     virtual void didInstallPageOverlay() = 0;
     63     virtual void didUninstallPageOverlay() = 0;
     64     virtual void setPageOverlayNeedsDisplay(const WebCore::IntRect&) = 0;
     65 
     66     virtual void pauseRendering() { }
     67     virtual void resumeRendering() { }
     68 
     69     // If a derived class overrides this function to return true, the derived class must also
     70     // override the functions beneath it.
     71     virtual bool participatesInDisplay() { return false; }
     72     virtual bool needsDisplay() { ASSERT_NOT_REACHED(); return false; }
     73     virtual double timeUntilNextDisplay() { ASSERT_NOT_REACHED(); return 0; }
     74     virtual void display(UpdateInfo&) { ASSERT_NOT_REACHED(); }
     75 
     76 protected:
     77     explicit LayerTreeHost(WebPage*);
     78 
     79     WebPage* m_webPage;
     80 };
     81 
     82 #if !PLATFORM(WIN)
     83 inline bool LayerTreeHost::supportsAcceleratedCompositing()
     84 {
     85     return true;
     86 }
     87 #endif
     88 
     89 } // namespace WebKit
     90 
     91 #endif // LayerTreeHost_h
     92