1 /* 2 * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 */ 19 20 #ifndef RenderSVGResourceClipper_h 21 #define RenderSVGResourceClipper_h 22 23 #include "core/rendering/svg/RenderSVGResourceContainer.h" 24 #include "core/svg/SVGClipPathElement.h" 25 26 namespace WebCore { 27 28 class DisplayList; 29 30 struct ClipperContext { 31 WTF_MAKE_FAST_ALLOCATED; 32 public: 33 enum ClipperState { NotAppliedState, AppliedPathState, AppliedMaskState }; 34 35 ClipperContext() 36 : state(NotAppliedState) 37 { 38 } 39 40 ClipperState state; 41 }; 42 43 class RenderSVGResourceClipper FINAL : public RenderSVGResourceContainer { 44 public: 45 explicit RenderSVGResourceClipper(SVGClipPathElement*); 46 virtual ~RenderSVGResourceClipper(); 47 48 virtual const char* renderName() const OVERRIDE { return "RenderSVGResourceClipper"; } 49 50 virtual void removeAllClientsFromCache(bool markForInvalidation = true) OVERRIDE; 51 virtual void removeClientFromCache(RenderObject*, bool markForInvalidation = true) OVERRIDE; 52 53 virtual bool applyResource(RenderObject*, RenderStyle*, GraphicsContext*&, unsigned short resourceMode) OVERRIDE; 54 virtual void postApplyResource(RenderObject*, GraphicsContext*&, unsigned short, const Path*, const RenderSVGShape*) OVERRIDE; 55 56 // FIXME: Filters are also stateful resources that could benefit from having their state managed 57 // on the caller stack instead of the current hashmap. We should look at refactoring these 58 // into a general interface that can be shared. 59 bool applyStatefulResource(RenderObject*, GraphicsContext*&, ClipperContext&); 60 void postApplyStatefulResource(RenderObject*, GraphicsContext*&, ClipperContext&); 61 62 // clipPath can be clipped too, but don't have a boundingBox or repaintRect. So we can't call 63 // applyResource directly and use the rects from the object, since they are empty for RenderSVGResources 64 // FIXME: We made applyClippingToContext public because we cannot call applyResource on HTML elements (it asserts on RenderObject::objectBoundingBox) 65 bool applyClippingToContext(RenderObject*, const FloatRect&, const FloatRect&, GraphicsContext*, ClipperContext&); 66 67 FloatRect resourceBoundingBox(const RenderObject*); 68 69 virtual RenderSVGResourceType resourceType() const OVERRIDE { return s_resourceType; } 70 71 bool hitTestClipContent(const FloatRect&, const FloatPoint&); 72 73 SVGUnitTypes::SVGUnitType clipPathUnits() const { return toSVGClipPathElement(element())->clipPathUnits()->currentValue()->enumValue(); } 74 75 static const RenderSVGResourceType s_resourceType; 76 private: 77 bool tryPathOnlyClipping(GraphicsContext*, const AffineTransform&, const FloatRect&); 78 void drawClipMaskContent(GraphicsContext*, const FloatRect& targetBoundingBox); 79 PassRefPtr<DisplayList> asDisplayList(GraphicsContext*, const AffineTransform&); 80 void calculateClipContentRepaintRect(); 81 82 RefPtr<DisplayList> m_clipContentDisplayList; 83 FloatRect m_clipBoundaries; 84 85 // Reference cycle detection. 86 bool m_inClipExpansion; 87 }; 88 89 DEFINE_RENDER_SVG_RESOURCE_TYPE_CASTS(RenderSVGResourceClipper, ClipperResourceType); 90 91 } 92 93 #endif 94
