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39
40
41#include "qquickclipnode_p.h"
42
43#include <QtGui/qvector2d.h>
44#include <QtCore/qmath.h>
45
46QT_BEGIN_NAMESPACE
47
48QQuickDefaultClipNode::QQuickDefaultClipNode(const QRectF &rect)
49 : m_rect(rect)
50 , m_radius(0)
51 , m_dirty_geometry(true)
52 , m_geometry(QSGGeometry::defaultAttributes_Point2D(), 0)
53{
54 Q_UNUSED(m_reserved);
55 setGeometry(&m_geometry);
56 setIsRectangular(true);
57}
58
59void QQuickDefaultClipNode::setRect(const QRectF &rect)
60{
61 m_rect = rect;
62 m_dirty_geometry = true;
63}
64
65void QQuickDefaultClipNode::setRadius(qreal radius)
66{
67 m_radius = radius;
68 m_dirty_geometry = true;
69 setIsRectangular(radius == 0);
70}
71
72void QQuickDefaultClipNode::update()
73{
74 if (m_dirty_geometry) {
75 updateGeometry();
76 m_dirty_geometry = false;
77 }
78}
79
80void QQuickDefaultClipNode::updateGeometry()
81{
82 QSGGeometry *g = geometry();
83
84 if (qFuzzyIsNull(d: m_radius)) {
85 g->allocate(vertexCount: 4);
86 QSGGeometry::updateRectGeometry(g, rect: m_rect);
87
88 } else {
89 int vertexCount = 0;
90
91 // Radius should never exceeds half of the width or half of the height
92 qreal radius = qMin(a: qMin(a: m_rect.width() / 2, b: m_rect.height() / 2), b: m_radius);
93 QRectF rect = m_rect;
94 rect.adjust(xp1: radius, yp1: radius, xp2: -radius, yp2: -radius);
95
96 int segments = qMin(a: 30, b: qCeil(v: radius)); // Number of segments per corner.
97
98 g->allocate(vertexCount: (segments + 1) * 4);
99
100 QVector2D *vertices = (QVector2D *)g->vertexData();
101
102 for (int part = 0; part < 2; ++part) {
103 for (int i = 0; i <= segments; ++i) {
104 //### Should change to calculate sin/cos only once.
105 qreal angle = qreal(0.5 * M_PI) * (part + i / qreal(segments));
106 qreal s = qFastSin(x: angle);
107 qreal c = qFastCos(x: angle);
108 qreal y = (part ? rect.bottom() : rect.top()) - radius * c; // current inner y-coordinate.
109 qreal lx = rect.left() - radius * s; // current inner left x-coordinate.
110 qreal rx = rect.right() + radius * s; // current inner right x-coordinate.
111
112 vertices[vertexCount++] = QVector2D(rx, y);
113 vertices[vertexCount++] = QVector2D(lx, y);
114 }
115 }
116
117 }
118 setClipRect(m_rect);
119 markDirty(bits: DirtyGeometry);
120}
121
122QT_END_NAMESPACE
123

source code of qtdeclarative/src/quick/items/qquickclipnode.cpp