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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef OpaqueRegionSkia_h 32 #define OpaqueRegionSkia_h 33 34 #include "platform/PlatformExport.h" 35 #include "platform/geometry/IntRect.h" 36 37 #include "SkBitmap.h" 38 #include "SkCanvas.h" 39 #include "SkPaint.h" 40 #include "SkPoint.h" 41 #include "SkRect.h" 42 43 namespace WebCore { 44 class GraphicsContext; 45 46 // This class is an encapsulation of functionality for GraphicsContext, and its methods are mirrored 47 // there for the outside world. It tracks paints and computes what area will be opaque. 48 class PLATFORM_EXPORT OpaqueRegionSkia FINAL { 49 public: 50 OpaqueRegionSkia(); 51 52 // The resulting opaque region as a single rect. 53 IntRect asRect() const; 54 55 void pushCanvasLayer(const SkPaint*); 56 void popCanvasLayer(const GraphicsContext*); 57 58 void setImageMask(const SkRect& imageOpaqueRect); 59 60 enum DrawType { 61 FillOnly, 62 FillOrStroke 63 }; 64 65 void didDrawRect(const GraphicsContext*, const SkRect&, const SkPaint&, const SkBitmap* sourceBitmap); 66 void didDrawPath(const GraphicsContext*, const SkPath&, const SkPaint&); 67 void didDrawPoints(const GraphicsContext*, SkCanvas::PointMode, int numPoints, const SkPoint[], const SkPaint&); 68 void didDrawBounded(const GraphicsContext*, const SkRect&, const SkPaint&); 69 void didDrawUnbounded(const GraphicsContext*, const SkPaint&, DrawType); 70 71 struct CanvasLayerState { CanvasLayerStateCanvasLayerState72 CanvasLayerState() 73 : hasImageMask(false) 74 , opaqueRect(SkRect::MakeEmpty()) 75 { } 76 77 SkPaint paint; 78 79 // An image mask is being applied to the layer. 80 bool hasImageMask; 81 // The opaque area in the image mask. 82 SkRect imageOpaqueRect; 83 84 SkRect opaqueRect; 85 }; 86 87 private: 88 void didDraw(const GraphicsContext*, const SkRect&, const SkPaint&, const SkBitmap* sourceBitmap, bool fillsBounds, DrawType); 89 void applyOpaqueRegionFromLayer(const GraphicsContext*, const SkRect& layerOpaqueRect, const SkPaint&); 90 void markRectAsOpaque(const SkRect&); 91 void markRectAsNonOpaque(const SkRect&); 92 void markAllAsNonOpaque(); 93 94 SkRect& currentTrackingOpaqueRect(); 95 96 SkRect m_opaqueRect; 97 98 Vector<CanvasLayerState, 3> m_canvasLayerStack; 99 }; 100 101 } 102 #endif // OpaqueRegionSkia_h 103