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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsgclipnode_p.h"
#include <QtGui/qvector2d.h>
#include <QtCore/qmath.h>
QSGDefaultClipNode::QSGDefaultClipNode(const QRectF &rect)
: m_rect(rect)
, m_radius(0)
, m_dirty_geometry(true)
, m_geometry(QSGGeometry::defaultAttributes_Point2D(), 0)
{
setGeometry(&m_geometry);
setIsRectangular(true);
}
void QSGDefaultClipNode::setRect(const QRectF &rect)
{
m_rect = rect;
m_dirty_geometry = true;
}
void QSGDefaultClipNode::setRadius(qreal radius)
{
m_radius = radius;
m_dirty_geometry = true;
setIsRectangular(radius == 0);
}
void QSGDefaultClipNode::update()
{
if (m_dirty_geometry) {
updateGeometry();
m_dirty_geometry = false;
}
}
void QSGDefaultClipNode::updateGeometry()
{
QSGGeometry *g = geometry();
if (qFuzzyIsNull(m_radius)) {
g->allocate(4);
QSGGeometry::updateRectGeometry(g, m_rect);
} else {
int vertexCount = 0;
// Radius should never exceeds half of the width or half of the height
qreal radius = qMin(qMin(m_rect.width() / 2, m_rect.height() / 2), m_radius);
QRectF rect = m_rect;
rect.adjust(radius, radius, -radius, -radius);
int segments = qMin(30, qCeil(radius)); // Number of segments per corner.
g->allocate((segments + 1) * 2);
QVector2D *vertices = (QVector2D *)g->vertexData();
for (int part = 0; part < 2; ++part) {
for (int i = 0; i <= segments; ++i) {
//### Should change to calculate sin/cos only once.
qreal angle = qreal(0.5 * M_PI) * (part + i / qreal(segments));
qreal s = qFastSin(angle);
qreal c = qFastCos(angle);
qreal y = (part ? rect.bottom() : rect.top()) - radius * c; // current inner y-coordinate.
qreal lx = rect.left() - radius * s; // current inner left x-coordinate.
qreal rx = rect.right() + radius * s; // current inner right x-coordinate.
vertices[vertexCount++] = QVector2D(rx, y);
vertices[vertexCount++] = QVector2D(lx, y);
}
}
markDirty(DirtyGeometry);
}
setClipRect(m_rect);
}
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