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      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 #if ENABLE(SVG)
     24 #include "FloatRect.h"
     25 #include "GraphicsContext.h"
     26 #include "ImageBuffer.h"
     27 #include "IntSize.h"
     28 #include "Path.h"
     29 #include "RenderSVGResourceContainer.h"
     30 #include "SVGClipPathElement.h"
     31 #include "SVGUnitTypes.h"
     32 
     33 #include <wtf/HashMap.h>
     34 #include <wtf/OwnPtr.h>
     35 
     36 namespace WebCore {
     37 
     38 struct ClipperData {
     39     WTF_MAKE_FAST_ALLOCATED;
     40 public:
     41     OwnPtr<ImageBuffer> clipMaskImage;
     42 };
     43 
     44 class RenderSVGResourceClipper : public RenderSVGResourceContainer {
     45 public:
     46     RenderSVGResourceClipper(SVGClipPathElement*);
     47     virtual ~RenderSVGResourceClipper();
     48 
     49     virtual const char* renderName() const { return "RenderSVGResourceClipper"; }
     50 
     51     virtual void removeAllClientsFromCache(bool markForInvalidation = true);
     52     virtual void removeClientFromCache(RenderObject*, bool markForInvalidation = true);
     53 
     54     virtual bool applyResource(RenderObject*, RenderStyle*, GraphicsContext*&, unsigned short resourceMode);
     55     virtual FloatRect resourceBoundingBox(RenderObject*);
     56 
     57     virtual RenderSVGResourceType resourceType() const { return ClipperResourceType; }
     58 
     59     bool hitTestClipContent(const FloatRect&, const FloatPoint&);
     60 
     61     SVGUnitTypes::SVGUnitType clipPathUnits() const { return toUnitType(static_cast<SVGClipPathElement*>(node())->clipPathUnits()); }
     62 
     63     static RenderSVGResourceType s_resourceType;
     64 private:
     65     // clipPath can be clipped too, but don't have a boundingBox or repaintRect. So we can't call
     66     // applyResource directly and use the rects from the object, since they are empty for RenderSVGResources
     67     bool applyClippingToContext(RenderObject*, const FloatRect&, const FloatRect&, GraphicsContext*);
     68     bool pathOnlyClipping(GraphicsContext*, const FloatRect&);
     69     bool drawContentIntoMaskImage(ClipperData*, const FloatRect& objectBoundingBox);
     70     void calculateClipContentRepaintRect();
     71 
     72     bool m_invalidationBlocked;
     73     FloatRect m_clipBoundaries;
     74     HashMap<RenderObject*, ClipperData*> m_clipper;
     75 };
     76 
     77 }
     78 
     79 #endif
     80 #endif
     81