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SVGResourceClipperQt.cpp
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1/*
2 Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <wildfox@kde.org>
3 2004, 2005, 2006 Rob Buis <buis@kde.org>
4 2005 Apple Computer, Inc.
5
6 This file is part of the KDE project
7
8 This library is free software; you can redistribute it and/or
9 modify it under the terms of the GNU Library General Public
10 License as published by the Free Software Foundation; either
11 version 2 of the License, or (at your option) any later version.
12
13 This library is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Library General Public License for more details.
17
18 You should have received a copy of the GNU Library General Public License
19 aint with this library; see the file COPYING.LIB. If not, write to
20 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA.
22*/
23
24#include "config.h"
25#include "wtf/Platform.h"
26
27#if ENABLE(SVG)
28#include "SVGResourceClipper.h"
29
30/*#include "GraphicsContext.h"*/
31
32#include <QPainter>
33#include <QPainterPath>
34
35#include "FloatRect.h"
36
37namespace WebCore {
38
39void SVGResourceClipper::applyClip(/*GraphicsContext* context*/QPainter* painter, const FloatRect& boundingBox) const
40{
41 if (m_clipData.clipData().size() < 1)
42 return;
43
44 /*context->beginPath();*/
45
46
47 QPainterPath newPath;
48
49 bool heterogenousClipRules = false;
50 WindRule clipRule = m_clipData.clipData()[0].windRule;
51
52 unsigned int clipDataCount = m_clipData.clipData().size();
53 for (unsigned int x = 0; x < clipDataCount; x++) {
54 ClipData clipData = m_clipData.clipData()[x];
55 if (clipData.windRule != clipRule)
56 heterogenousClipRules = true;
57
58 QPainterPath path = *(clipData.path.platformPath());
59 if (path.isEmpty())
60 continue;
61
62 if (!newPath.isEmpty())
63 newPath.closeSubpath();
64
65 // Respect clipping units...
66 QMatrix transform;
67
68 if (clipData.bboxUnits) {
69 transform.translate(boundingBox.x(), boundingBox.y());
70 transform.scale(boundingBox.width(), boundingBox.height());
71 }
72
73 // TODO: support heterogenous clip rules!
74 //clipRule = (clipData.windRule() == RULE_EVENODD ? Qt::OddEvenFill : Qt::WindingFill);
75
76 for (int i = 0; i < path.elementCount(); ++i) {
77 const QPainterPath::Element &cur = path.elementAt(i);
78
79 switch (cur.type) {
80 case QPainterPath::MoveToElement:
81 newPath.moveTo(QPointF(cur.x, cur.y) * transform);
82 break;
83 case QPainterPath::LineToElement:
84 newPath.lineTo(QPointF(cur.x, cur.y) * transform);
85 break;
86 case QPainterPath::CurveToElement:
87 {
88 const QPainterPath::Element &c1 = path.elementAt(i + 1);
89 const QPainterPath::Element &c2 = path.elementAt(i + 2);
90
91 Q_ASSERT(c1.type == QPainterPath::CurveToDataElement);
92 Q_ASSERT(c2.type == QPainterPath::CurveToDataElement);
93
94 newPath.cubicTo(QPointF(cur.x, cur.y) * transform,
95 QPointF(c1.x, c1.y) * transform,
96 QPointF(c2.x, c2.y) * transform);
97
98 i += 2;
99 break;
100 }
101 case QPainterPath::CurveToDataElement:
102 Q_ASSERT(false);
103 break;
104 }
105 }
106 }
107
108 if (m_clipData.clipData().size()) {
109 // FIXME!
110 // We don't currently allow for heterogenous clip rules.
111 // we would have to detect such, draw to a mask, and then clip
112 // to that mask
113 // if (!CGContextIsPathEmpty(cgContext)) {
114 if (clipRule == RULE_EVENODD)
115 newPath.setFillRule(Qt::OddEvenFill);
116 else
117 newPath.setFillRule(Qt::WindingFill);
118 // }
119 }
120
121 /*QPainter* painter(context ? context->platformContext() : 0);
122 Q_ASSERT(painter);*/
123
124 painter->setClipPath(newPath);
125}
126
127} // namespace WebCore
128
129#endif
130
131// vim:ts=4
FloatRect.h
SVGResourceClipper.h
WebCore
Definition: CSSHelper.h:7
khtml::WindRule
WindRule
Definition: Path.h:48
khtml::RULE_EVENODD
@ RULE_EVENODD
Definition: Path.h:50
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