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