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/*
Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <wildfox@kde.org>
2004, 2005, 2006 Rob Buis <buis@kde.org>
2005 Apple Computer, Inc.
This file is part of the KDE project
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
aint with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "config.h"
#if ENABLE(SVG)
#include "SVGResourceClipper.h"
#include "GraphicsContext.h"
#include <QPainter>
#include <QPainterPath>
namespace WebCore {
void SVGResourceClipper::applyClip(GraphicsContext* context, const FloatRect& boundingBox) const
{
if (m_clipData.clipData().size() < 1)
return;
context->beginPath();
QPainterPath newPath;
bool heterogenousClipRules = false;
WindRule clipRule = m_clipData.clipData()[0].windRule;
unsigned int clipDataCount = m_clipData.clipData().size();
for (unsigned int x = 0; x < clipDataCount; x++) {
ClipData clipData = m_clipData.clipData()[x];
if (clipData.windRule != clipRule)
heterogenousClipRules = true;
QPainterPath path = *(clipData.path.platformPath());
if (path.isEmpty())
continue;
if (!newPath.isEmpty())
newPath.closeSubpath();
// Respect clipping units...
QMatrix transform;
if (clipData.bboxUnits) {
transform.translate(boundingBox.x(), boundingBox.y());
transform.scale(boundingBox.width(), boundingBox.height());
}
// TODO: support heterogenous clip rules!
//clipRule = (clipData.windRule() == RULE_EVENODD ? Qt::OddEvenFill : Qt::WindingFill);
for (int i = 0; i < path.elementCount(); ++i) {
const QPainterPath::Element &cur = path.elementAt(i);
switch (cur.type) {
case QPainterPath::MoveToElement:
newPath.moveTo(QPointF(cur.x, cur.y) * transform);
break;
case QPainterPath::LineToElement:
newPath.lineTo(QPointF(cur.x, cur.y) * transform);
break;
case QPainterPath::CurveToElement:
{
const QPainterPath::Element &c1 = path.elementAt(i + 1);
const QPainterPath::Element &c2 = path.elementAt(i + 2);
Q_ASSERT(c1.type == QPainterPath::CurveToDataElement);
Q_ASSERT(c2.type == QPainterPath::CurveToDataElement);
newPath.cubicTo(QPointF(cur.x, cur.y) * transform,
QPointF(c1.x, c1.y) * transform,
QPointF(c2.x, c2.y) * transform);
i += 2;
break;
}
case QPainterPath::CurveToDataElement:
Q_ASSERT(false);
break;
}
}
}
if (m_clipData.clipData().size()) {
// FIXME!
// We don't currently allow for heterogenous clip rules.
// we would have to detect such, draw to a mask, and then clip
// to that mask
// if (!CGContextIsPathEmpty(cgContext)) {
if (clipRule == RULE_EVENODD)
newPath.setFillRule(Qt::OddEvenFill);
else
newPath.setFillRule(Qt::WindingFill);
// }
}
QPainter* painter(context ? context->platformContext() : 0);
Q_ASSERT(painter);
painter->setClipPath(newPath);
}
} // namespace WebCore
#endif
// vim:ts=4:noet
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