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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 BackingStore_h
     27 #define BackingStore_h
     28 
     29 #include <WebCore/IntSize.h>
     30 #include <wtf/Noncopyable.h>
     31 #include <wtf/PassOwnPtr.h>
     32 
     33 #if PLATFORM(MAC)
     34 #include <wtf/RetainPtr.h>
     35 #elif PLATFORM(WIN)
     36 #include <wtf/OwnPtr.h>
     37 #endif
     38 
     39 namespace WebCore {
     40     class IntRect;
     41 }
     42 
     43 namespace WebKit {
     44 
     45 class ShareableBitmap;
     46 class UpdateInfo;
     47 class WebPageProxy;
     48 
     49 class BackingStore {
     50     WTF_MAKE_NONCOPYABLE(BackingStore);
     51 
     52 public:
     53     static PassOwnPtr<BackingStore> create(const WebCore::IntSize&, WebPageProxy*);
     54     ~BackingStore();
     55 
     56     const WebCore::IntSize& size() const { return m_size; }
     57 
     58 #if PLATFORM(MAC)
     59     typedef CGContextRef PlatformGraphicsContext;
     60 #elif PLATFORM(WIN)
     61     typedef HDC PlatformGraphicsContext;
     62 #endif
     63 
     64     void paint(PlatformGraphicsContext, const WebCore::IntRect&);
     65     void incorporateUpdate(const UpdateInfo&);
     66 
     67 private:
     68     BackingStore(const WebCore::IntSize&, WebPageProxy*);
     69 
     70     void incorporateUpdate(ShareableBitmap*, const UpdateInfo&);
     71     void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollOffset);
     72 
     73     WebCore::IntSize m_size;
     74     WebPageProxy* m_webPageProxy;
     75 
     76 #if PLATFORM(MAC)
     77     CGContextRef backingStoreContext();
     78 
     79     RetainPtr<CGLayerRef> m_cgLayer;
     80     RetainPtr<CGContextRef> m_bitmapContext;
     81 #elif PLATFORM(WIN)
     82     OwnPtr<HBITMAP> m_bitmap;
     83 #endif
     84 };
     85 
     86 } // namespace WebKit
     87 
     88 #endif // BackingStore_h
     89