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
36namespace WebCore {
37
38struct ClipperData {
39    WTF_MAKE_FAST_ALLOCATED;
40public:
41    OwnPtr<ImageBuffer> clipMaskImage;
42};
43
44class RenderSVGResourceClipper : public RenderSVGResourceContainer {
45public:
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;
64private:
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