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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  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef Canvas2DLayerBridge_h
     27 #define Canvas2DLayerBridge_h
     28 
     29 #include "SkDeferredCanvas.h"
     30 #include "SkImage.h"
     31 #include "core/platform/graphics/GraphicsContext3D.h"
     32 #include "core/platform/graphics/IntSize.h"
     33 #include "public/platform/WebExternalTextureLayer.h"
     34 #include "public/platform/WebExternalTextureLayerClient.h"
     35 #include "public/platform/WebExternalTextureMailbox.h"
     36 #include "wtf/DoublyLinkedList.h"
     37 #include "wtf/PassOwnPtr.h"
     38 #include "wtf/RefPtr.h"
     39 
     40 namespace WebKit {
     41 class WebGraphicsContext3D;
     42 }
     43 
     44 namespace WebCore {
     45 
     46 class Canvas2DLayerBridge : public WebKit::WebExternalTextureLayerClient, public SkDeferredCanvas::NotificationClient, public DoublyLinkedListNode<Canvas2DLayerBridge> {
     47     WTF_MAKE_NONCOPYABLE(Canvas2DLayerBridge);
     48 public:
     49     enum OpacityMode {
     50         Opaque,
     51         NonOpaque
     52     };
     53 
     54     static PassOwnPtr<Canvas2DLayerBridge> create(PassRefPtr<GraphicsContext3D>, const IntSize&, OpacityMode);
     55 
     56     virtual ~Canvas2DLayerBridge();
     57 
     58     // WebKit::WebExternalTextureLayerClient implementation.
     59     virtual WebKit::WebGraphicsContext3D* context() OVERRIDE;
     60     virtual bool prepareMailbox(WebKit::WebExternalTextureMailbox*, WebKit::WebExternalBitmap*) OVERRIDE;
     61     virtual void mailboxReleased(const WebKit::WebExternalTextureMailbox&) OVERRIDE;
     62 
     63     // SkDeferredCanvas::NotificationClient implementation
     64     virtual void prepareForDraw() OVERRIDE;
     65     virtual void storageAllocatedForRecordingChanged(size_t) OVERRIDE;
     66     virtual void flushedDrawCommands() OVERRIDE;
     67     virtual void skippedPendingDrawCommands() OVERRIDE;
     68 
     69     // Methods used by Canvas2DLayerManager
     70     virtual size_t freeMemoryIfPossible(size_t); // virtual for mocking
     71     virtual void flush(); // virtual for mocking
     72     virtual size_t storageAllocatedForRecording(); // virtual for faking
     73     size_t bytesAllocated() const {return m_bytesAllocated;}
     74     void limitPendingFrames();
     75 
     76     WebKit::WebLayer* layer();
     77     void contextAcquired();
     78     SkCanvas* getCanvas() { return m_canvas; }
     79 
     80     unsigned backBufferTexture();
     81 
     82     bool isValid();
     83 
     84 protected:
     85     Canvas2DLayerBridge(PassRefPtr<GraphicsContext3D>, SkDeferredCanvas*, OpacityMode);
     86     void setRateLimitingEnabled(bool);
     87 
     88     SkDeferredCanvas* m_canvas;
     89     OwnPtr<WebKit::WebExternalTextureLayer> m_layer;
     90     RefPtr<GraphicsContext3D> m_context;
     91     size_t m_bytesAllocated;
     92     bool m_didRecordDrawCommand;
     93     bool m_surfaceIsValid;
     94     int m_framesPending;
     95     bool m_rateLimitingEnabled;
     96 
     97     friend class WTF::DoublyLinkedListNode<Canvas2DLayerBridge>;
     98     Canvas2DLayerBridge* m_next;
     99     Canvas2DLayerBridge* m_prev;
    100 
    101     enum MailboxStatus {
    102         MailboxInUse,
    103         MailboxReleased,
    104         MailboxAvailable,
    105     };
    106 
    107     struct MailboxInfo {
    108         WebKit::WebExternalTextureMailbox m_mailbox;
    109         SkAutoTUnref<SkImage> m_image;
    110         MailboxStatus m_status;
    111 
    112         MailboxInfo(const MailboxInfo&);
    113         MailboxInfo() {}
    114     };
    115     MailboxInfo* createMailboxInfo();
    116 
    117     uint32_t m_lastImageId;
    118     Vector<MailboxInfo> m_mailboxes;
    119 };
    120 
    121 }
    122 
    123 #endif
    124