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qquickclipnode.cpp 3.77 KiB
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/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the QtQuick module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL21$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qquickclipnode_p.h"
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#include <QtGui/qvector2d.h>
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#include <QtCore/qmath.h>
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QQuickDefaultClipNode::QQuickDefaultClipNode(const QRectF &rect)
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    : m_rect(rect)
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    , m_radius(0)
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    , m_dirty_geometry(true)
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    , m_geometry(QSGGeometry::defaultAttributes_Point2D(), 0)
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{
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    Q_UNUSED(m_reserved);
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    setGeometry(&m_geometry);
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    setIsRectangular(true);
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}
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void QQuickDefaultClipNode::setRect(const QRectF &rect)
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{
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    m_rect = rect;
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    m_dirty_geometry = true;
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}
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void QQuickDefaultClipNode::setRadius(qreal radius)
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{
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    m_radius = radius;
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    m_dirty_geometry = true;
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    setIsRectangular(radius == 0);
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}
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void QQuickDefaultClipNode::update()
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{
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    if (m_dirty_geometry) {
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        updateGeometry();
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        m_dirty_geometry = false;
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    }
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}
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void QQuickDefaultClipNode::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); }