1 /** 2 * Copyright (C) 2007 Rob Buis <buis@kde.org> 3 * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org> 4 * Copyright (C) 2007 Eric Seidel <eric@webkit.org> 5 * Copyright (C) 2009 Google, Inc. All rights reserved. 6 * Copyright (C) Research In Motion Limited 2010. All rights reserved. 7 * Copyright (C) 2012 Zoltan Herczeg <zherczeg@webkit.org>. 8 * 9 * This library is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU Library General Public 11 * License as published by the Free Software Foundation; either 12 * version 2 of the License, or (at your option) any later version. 13 * 14 * This library is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * Library General Public License for more details. 18 * 19 * You should have received a copy of the GNU Library General Public License 20 * along with this library; see the file COPYING.LIB. If not, write to 21 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 22 * Boston, MA 02110-1301, USA. 23 */ 24 25 #ifndef SVGRenderingContext_h 26 #define SVGRenderingContext_h 27 28 #include "core/rendering/PaintInfo.h" 29 #include "core/rendering/svg/RenderSVGResourceClipper.h" 30 #include "platform/graphics/ImageBuffer.h" 31 32 namespace blink { 33 34 class AffineTransform; 35 class RenderObject; 36 class FloatRect; 37 class RenderSVGResourceFilter; 38 class RenderSVGResourceMasker; 39 40 // SVGRenderingContext 41 class SVGRenderingContext { 42 public: 43 // Does not start rendering. SVGRenderingContext()44 SVGRenderingContext() 45 : m_renderingFlags(0) 46 , m_object(0) 47 , m_paintInfo(0) 48 , m_savedContext(0) 49 , m_filter(0) 50 , m_clipper(0) 51 , m_clipperState(RenderSVGResourceClipper::ClipperNotApplied) 52 , m_masker(0) 53 { 54 } 55 SVGRenderingContext(RenderObject * object,PaintInfo & paintinfo)56 SVGRenderingContext(RenderObject* object, PaintInfo& paintinfo) 57 : m_renderingFlags(0) 58 , m_object(0) 59 , m_paintInfo(0) 60 , m_savedContext(0) 61 , m_filter(0) 62 , m_clipper(0) 63 , m_clipperState(RenderSVGResourceClipper::ClipperNotApplied) 64 , m_masker(0) 65 { 66 prepareToRenderSVGContent(object, paintinfo); 67 } 68 69 // Automatically finishes context rendering. 70 ~SVGRenderingContext(); 71 72 // Used by all SVG renderers who apply clip/filter/etc. resources to the renderer content. 73 void prepareToRenderSVGContent(RenderObject*, PaintInfo&); isRenderingPrepared()74 bool isRenderingPrepared() const { return m_renderingFlags & RenderingPrepared; } 75 76 static void renderSubtree(GraphicsContext*, RenderObject*, const AffineTransform&); 77 78 static float calculateScreenFontSizeScalingFactor(const RenderObject*); 79 static void calculateDeviceSpaceTransformation(const RenderObject*, AffineTransform& absoluteTransform); 80 static FloatRect clampedAbsoluteTargetRect(const FloatRect& absoluteTargetRect); 81 static void clear2DRotation(AffineTransform&); 82 calculateImageBufferRect(const FloatRect & targetRect,const AffineTransform & absoluteTransform)83 static IntRect calculateImageBufferRect(const FloatRect& targetRect, const AffineTransform& absoluteTransform) 84 { 85 return enclosingIntRect(absoluteTransform.mapRect(targetRect)); 86 } 87 88 // Support for the buffered-rendering hint. 89 bool bufferForeground(OwnPtr<ImageBuffer>&); 90 91 private: 92 // To properly revert partially successful initializtions in the destructor, we record all successful steps. 93 enum RenderingFlags { 94 RenderingPrepared = 1, 95 RestoreGraphicsContext = 1 << 1, 96 EndOpacityLayer = 1 << 2, 97 PostApplyResources = 1 << 3, 98 PrepareToRenderSVGContentWasCalled = 1 << 4 99 }; 100 101 // List of those flags which require actions during the destructor. 102 const static int ActionsNeeded = RestoreGraphicsContext | EndOpacityLayer | PostApplyResources; 103 104 int m_renderingFlags; 105 RenderObject* m_object; 106 PaintInfo* m_paintInfo; 107 GraphicsContext* m_savedContext; 108 IntRect m_savedPaintRect; 109 RenderSVGResourceFilter* m_filter; 110 RenderSVGResourceClipper* m_clipper; 111 RenderSVGResourceClipper::ClipperState m_clipperState; 112 RenderSVGResourceMasker* m_masker; 113 }; 114 115 } // namespace blink 116 117 #endif // SVGRenderingContext_h 118