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Diffstat (limited to 'src/declarative/items/qsgclipnode.cpp')
-rw-r--r-- | src/declarative/items/qsgclipnode.cpp | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/declarative/items/qsgclipnode.cpp b/src/declarative/items/qsgclipnode.cpp new file mode 100644 index 0000000000..2e40972620 --- /dev/null +++ b/src/declarative/items/qsgclipnode.cpp @@ -0,0 +1,121 @@ + +/**************************************************************************** +** +** 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); +} + |