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 RenderSVGResourceMarker_h
21#define RenderSVGResourceMarker_h
22
23#include "core/rendering/svg/RenderSVGResourceContainer.h"
24#include "core/svg/SVGElement.h"
25#include "core/svg/SVGMarkerElement.h"
26#include "platform/geometry/FloatRect.h"
27#include "wtf/HashSet.h"
28
29namespace WebCore {
30
31class AffineTransform;
32class RenderObject;
33
34class RenderSVGResourceMarker FINAL : public RenderSVGResourceContainer {
35public:
36    explicit RenderSVGResourceMarker(SVGMarkerElement*);
37    virtual ~RenderSVGResourceMarker();
38
39    virtual const char* renderName() const { return "RenderSVGResourceMarker"; }
40
41    virtual void removeAllClientsFromCache(bool markForInvalidation = true);
42    virtual void removeClientFromCache(RenderObject*, bool markForInvalidation = true);
43
44    void draw(PaintInfo&, const AffineTransform&);
45
46    // Calculates marker boundaries, mapped to the target element's coordinate space
47    FloatRect markerBoundaries(const AffineTransform& markerTransformation) const;
48
49    virtual void applyViewportClip(PaintInfo&);
50    virtual void layout();
51    virtual void calcViewport();
52
53    virtual const AffineTransform& localToParentTransform() const;
54    AffineTransform markerTransformation(const FloatPoint& origin, float angle, float strokeWidth) const;
55
56    virtual bool applyResource(RenderObject*, RenderStyle*, GraphicsContext*&, unsigned short) { return false; }
57
58    FloatPoint referencePoint() const;
59    float angle() const;
60    SVGMarkerUnitsType markerUnits() const { return toSVGMarkerElement(element())->markerUnitsCurrentValue(); }
61
62    virtual RenderSVGResourceType resourceType() const { return s_resourceType; }
63    static const RenderSVGResourceType s_resourceType;
64
65private:
66    // Generates a transformation matrix usable to render marker content. Handles scaling the marker content
67    // acording to SVGs markerUnits="strokeWidth" concept, when a strokeWidth value != -1 is passed in.
68    AffineTransform markerContentTransformation(const AffineTransform& contentTransformation, const FloatPoint& origin, float strokeWidth = -1) const;
69
70    AffineTransform viewportTransform() const;
71
72    mutable AffineTransform m_localToParentTransform;
73    FloatRect m_viewport;
74};
75
76DEFINE_RENDER_SVG_RESOURCE_TYPE_CASTS(RenderSVGResourceMarker, MarkerResourceType);
77
78}
79
80#endif
81