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 blink {
30
31class RenderObject;
32
33class RenderSVGResourceMarker FINAL : public RenderSVGResourceContainer {
34public:
35    explicit RenderSVGResourceMarker(SVGMarkerElement*);
36    virtual ~RenderSVGResourceMarker();
37
38    virtual const char* renderName() const OVERRIDE { return "RenderSVGResourceMarker"; }
39
40    virtual void removeAllClientsFromCache(bool markForInvalidation = true) OVERRIDE;
41    virtual void removeClientFromCache(RenderObject*, bool markForInvalidation = true) OVERRIDE;
42
43    void draw(PaintInfo&, const AffineTransform&);
44
45    // Calculates marker boundaries, mapped to the target element's coordinate space
46    FloatRect markerBoundaries(const AffineTransform& markerTransformation) const;
47
48    virtual void applyViewportClip(PaintInfo&) OVERRIDE;
49    virtual void layout() OVERRIDE;
50    virtual void calcViewport() OVERRIDE;
51
52    virtual const AffineTransform& localToParentTransform() const OVERRIDE;
53    AffineTransform markerTransformation(const FloatPoint& origin, float angle, float strokeWidth) const;
54
55    virtual bool applyResource(RenderObject*, RenderStyle*, GraphicsContext*&, unsigned short) OVERRIDE { return false; }
56
57    FloatPoint referencePoint() const;
58    float angle() const;
59    SVGMarkerUnitsType markerUnits() const { return toSVGMarkerElement(element())->markerUnits()->currentValue()->enumValue(); }
60    SVGMarkerOrientType orientType() const { return toSVGMarkerElement(element())->orientType()->currentValue()->enumValue(); }
61
62    virtual RenderSVGResourceType resourceType() const OVERRIDE { 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