1/* 2 * Copyright (C) 2013 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. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef RemoteLayerBackingStore_h 27#define RemoteLayerBackingStore_h 28 29#include "ShareableBitmap.h" 30#include <WebCore/FloatRect.h> 31#include <WebCore/IOSurface.h> 32#include <WebCore/Region.h> 33#include <chrono> 34 35OBJC_CLASS CALayer; 36 37// FIXME: Make PlatformCALayerRemote.cpp Objective-C so we can include WebLayer.h here and share the typedef. 38namespace WebCore { 39typedef Vector<WebCore::FloatRect, 5> RepaintRectList; 40} 41 42namespace WebKit { 43 44class PlatformCALayerRemote; 45 46class RemoteLayerBackingStore { 47 WTF_MAKE_NONCOPYABLE(RemoteLayerBackingStore); 48 WTF_MAKE_FAST_ALLOCATED; 49public: 50 RemoteLayerBackingStore(PlatformCALayerRemote*); 51 ~RemoteLayerBackingStore(); 52 53 void ensureBackingStore(WebCore::FloatSize, float scale, bool acceleratesDrawing, bool isOpaque); 54 55 void setNeedsDisplay(const WebCore::IntRect); 56 void setNeedsDisplay(); 57 58 bool display(); 59 60 WebCore::FloatSize size() const { return m_size; } 61 float scale() const { return m_scale; } 62 bool acceleratesDrawing() const { return m_acceleratesDrawing; } 63 bool isOpaque() const { return m_isOpaque; } 64 65 PlatformCALayerRemote* layer() const { return m_layer; } 66 67 void applyBackingStoreToLayer(CALayer *); 68 69 void encode(IPC::ArgumentEncoder&) const; 70 static bool decode(IPC::ArgumentDecoder&, RemoteLayerBackingStore&); 71 72 void enumerateRectsBeingDrawn(CGContextRef, void (^)(CGRect)); 73 74 bool hasFrontBuffer() const 75 { 76#if USE(IOSURFACE) 77 if (m_acceleratesDrawing) 78 return !!m_frontBuffer.surface; 79#endif 80 return !!m_frontBuffer.bitmap; 81 } 82 83 RetainPtr<CGContextRef> takeFrontContextPendingFlush(); 84 85 enum class BufferType { 86 Front, 87 Back, 88 SecondaryBack 89 }; 90 91 bool setBufferVolatility(BufferType type, bool isVolatile); 92 93 std::chrono::steady_clock::time_point lastDisplayTime() const { return m_lastDisplayTime; } 94 95private: 96 void drawInContext(WebCore::GraphicsContext&, CGImageRef backImage); 97 void clearBackingStore(); 98 void swapToValidFrontBuffer(); 99 100 PlatformCALayerRemote* m_layer; 101 102 WebCore::FloatSize m_size; 103 float m_scale; 104 bool m_isOpaque; 105 106 WebCore::Region m_dirtyRegion; 107 108 struct Buffer { 109 RefPtr<ShareableBitmap> bitmap; 110#if USE(IOSURFACE) 111 RefPtr<WebCore::IOSurface> surface; 112 bool isVolatile = false; 113#endif 114 115 explicit operator bool() const 116 { 117#if USE(IOSURFACE) 118 if (surface) 119 return true; 120#endif 121 if (bitmap) 122 return true; 123 124 return false; 125 } 126 127 void discard(); 128 }; 129 130 Buffer m_frontBuffer; 131 Buffer m_backBuffer; 132#if USE(IOSURFACE) 133 Buffer m_secondaryBackBuffer; 134#endif 135 136 RetainPtr<CGContextRef> m_frontContextPendingFlush; 137 138 bool m_acceleratesDrawing; 139 140 WebCore::RepaintRectList m_paintingRects; 141 142 std::chrono::steady_clock::time_point m_lastDisplayTime; 143}; 144 145} // namespace WebKit 146 147#endif // RemoteLayerBackingStore_h 148