1 files changed, 121 insertions, 0 deletions
diff --git a/src/declarative/items/qsgclipnode.cpp b/src/declarative/items/qsgclipnode.cpp
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+++ b/src/declarative/items/qsgclipnode.cpp
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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);
+}
+