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 
renderName()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 
resourceType()57     virtual RenderSVGResourceType resourceType() const { return ClipperResourceType; }
58 
59     bool hitTestClipContent(const FloatRect&, const FloatPoint&);
60 
clipPathUnits()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