1// Copyright (C) 2016 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4
5#include "qquickclipnode_p.h"
6
7#include <QtGui/qvector2d.h>
8#include <QtCore/qmath.h>
9
10QT_BEGIN_NAMESPACE
11
12QQuickDefaultClipNode::QQuickDefaultClipNode(const QRectF &rect)
13 : m_rect(rect)
14 , m_radius(0)
15 , m_dirty_geometry(true)
16 , m_geometry(QSGGeometry::defaultAttributes_Point2D(), 0)
17{
18 Q_UNUSED(m_reserved);
19 setGeometry(&m_geometry);
20 setIsRectangular(true);
21}
22
23void QQuickDefaultClipNode::setRect(const QRectF &rect)
24{
25 m_rect = rect;
26 m_dirty_geometry = true;
27}
28
29void QQuickDefaultClipNode::setRadius(qreal radius)
30{
31 m_radius = radius;
32 m_dirty_geometry = true;
33 setIsRectangular(radius == 0);
34}
35
36void QQuickDefaultClipNode::update()
37{
38 if (m_dirty_geometry) {
39 updateGeometry();
40 m_dirty_geometry = false;
41 }
42}
43
44void QQuickDefaultClipNode::updateGeometry()
45{
46 QSGGeometry *g = geometry();
47
48 if (qFuzzyIsNull(d: m_radius)) {
49 g->allocate(vertexCount: 4);
50 QSGGeometry::updateRectGeometry(g, rect: m_rect);
51
52 } else {
53 int vertexCount = 0;
54
55 // Radius should never exceeds half of the width or half of the height
56 qreal radius = qMin(a: qMin(a: m_rect.width() / 2, b: m_rect.height() / 2), b: m_radius);
57 QRectF rect = m_rect;
58 rect.adjust(xp1: radius, yp1: radius, xp2: -radius, yp2: -radius);
59
60 int segments = qMin(a: 30, b: qCeil(v: radius)); // Number of segments per corner.
61
62 g->allocate(vertexCount: (segments + 1) * 4);
63
64 QVector2D *vertices = (QVector2D *)g->vertexData();
65
66 for (int part = 0; part < 2; ++part) {
67 for (int i = 0; i <= segments; ++i) {
68 //### Should change to calculate sin/cos only once.
69 qreal angle = qreal(0.5 * M_PI) * (part + i / qreal(segments));
70 qreal s = qFastSin(x: angle);
71 qreal c = qFastCos(x: angle);
72 qreal y = (part ? rect.bottom() : rect.top()) - radius * c; // current inner y-coordinate.
73 qreal lx = rect.left() - radius * s; // current inner left x-coordinate.
74 qreal rx = rect.right() + radius * s; // current inner right x-coordinate.
75
76 vertices[vertexCount++] = QVector2D(rx, y);
77 vertices[vertexCount++] = QVector2D(lx, y);
78 }
79 }
80
81 }
82#ifdef QSG_RUNTIME_DESCRIPTION
83#ifndef QT_NO_DEBUG_STREAM
84 QString desc;
85 {
86 QDebug dbg(&desc);
87 dbg << m_rect;
88 if (!qFuzzyIsNull(d: m_radius))
89 dbg << "radius" << m_radius;
90 }
91 qsgnode_set_description(node: this, description: desc);
92#endif
93#endif
94 setClipRect(m_rect);
95 markDirty(bits: DirtyGeometry);
96}
97
98QT_END_NAMESPACE
99

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