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 blink { 27 28 class DisplayList; 29 30 class RenderSVGResourceClipper FINAL : public RenderSVGResourceContainer { 31 public: 32 enum ClipperState { 33 ClipperNotApplied, 34 ClipperAppliedPath, 35 ClipperAppliedMask 36 }; 37 38 explicit RenderSVGResourceClipper(SVGClipPathElement*); 39 virtual ~RenderSVGResourceClipper(); 40 41 virtual const char* renderName() const OVERRIDE { return "RenderSVGResourceClipper"; } 42 43 virtual void removeAllClientsFromCache(bool markForInvalidation = true) OVERRIDE; 44 virtual void removeClientFromCache(RenderObject*, bool markForInvalidation = true) OVERRIDE; 45 46 virtual bool applyResource(RenderObject*, RenderStyle*, GraphicsContext*&, unsigned short resourceMode) OVERRIDE; 47 virtual void postApplyResource(RenderObject*, GraphicsContext*&) OVERRIDE; 48 49 // FIXME: Filters are also stateful resources that could benefit from having their state managed 50 // on the caller stack instead of the current hashmap. We should look at refactoring these 51 // into a general interface that can be shared. 52 bool applyStatefulResource(RenderObject*, GraphicsContext*&, ClipperState&); 53 void postApplyStatefulResource(RenderObject*, GraphicsContext*&, ClipperState&); 54 55 // clipPath can be clipped too, but don't have a boundingBox or paintInvalidationRect. So we can't call 56 // applyResource directly and use the rects from the object, since they are empty for RenderSVGResources 57 // FIXME: We made applyClippingToContext public because we cannot call applyResource on HTML elements (it asserts on RenderObject::objectBoundingBox) 58 bool applyClippingToContext(RenderObject*, const FloatRect&, const FloatRect&, GraphicsContext*, ClipperState&); 59 60 FloatRect resourceBoundingBox(const RenderObject*); 61 62 virtual RenderSVGResourceType resourceType() const OVERRIDE { return s_resourceType; } 63 64 bool hitTestClipContent(const FloatRect&, const FloatPoint&); 65 66 SVGUnitTypes::SVGUnitType clipPathUnits() const { return toSVGClipPathElement(element())->clipPathUnits()->currentValue()->enumValue(); } 67 68 static const RenderSVGResourceType s_resourceType; 69 private: 70 bool tryPathOnlyClipping(GraphicsContext*, const AffineTransform&, const FloatRect&); 71 void drawClipMaskContent(GraphicsContext*, const FloatRect& targetBoundingBox); 72 void createDisplayList(GraphicsContext*, const AffineTransform&); 73 void calculateClipContentPaintInvalidationRect(); 74 75 RefPtr<DisplayList> m_clipContentDisplayList; 76 FloatRect m_clipBoundaries; 77 78 // Reference cycle detection. 79 bool m_inClipExpansion; 80 }; 81 82 DEFINE_RENDER_SVG_RESOURCE_TYPE_CASTS(RenderSVGResourceClipper, ClipperResourceType); 83 84 } 85 86 #endif 87
