Qt 4.8
qregion_x11.cpp
Go to the documentation of this file.
1 /****************************************************************************
2 **
3 ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
4 ** Contact: http://www.qt-project.org/legal
5 **
6 ** This file is part of the QtGui module of the Qt Toolkit.
7 **
8 ** $QT_BEGIN_LICENSE:LGPL$
9 ** Commercial License Usage
10 ** Licensees holding valid commercial Qt licenses may use this file in
11 ** accordance with the commercial license agreement provided with the
12 ** Software or, alternatively, in accordance with the terms contained in
13 ** a written agreement between you and Digia. For licensing terms and
14 ** conditions see http://qt.digia.com/licensing. For further information
15 ** use the contact form at http://qt.digia.com/contact-us.
16 **
17 ** GNU Lesser General Public License Usage
18 ** Alternatively, this file may be used under the terms of the GNU Lesser
19 ** General Public License version 2.1 as published by the Free Software
20 ** Foundation and appearing in the file LICENSE.LGPL included in the
21 ** packaging of this file. Please review the following information to
22 ** ensure the GNU Lesser General Public License version 2.1 requirements
23 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
24 **
25 ** In addition, as a special exception, Digia gives you certain additional
26 ** rights. These rights are described in the Digia Qt LGPL Exception
27 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
28 **
29 ** GNU General Public License Usage
30 ** Alternatively, this file may be used under the terms of the GNU
31 ** General Public License version 3.0 as published by the Free Software
32 ** Foundation and appearing in the file LICENSE.GPL included in the
33 ** packaging of this file. Please review the following information to
34 ** ensure the GNU General Public License version 3.0 requirements will be
35 ** met: http://www.gnu.org/copyleft/gpl.html.
36 **
37 **
38 ** $QT_END_LICENSE$
39 **
40 ****************************************************************************/
41 
42 #include <private/qt_x11_p.h>
43 
44 #include <limits.h>
45 
47 
49 
50 void QRegion::updateX11Region() const
51 {
52  d->rgn = XCreateRegion();
53  if (!d->qt_rgn)
54  return;
55 
56  int n = d->qt_rgn->numRects;
57  const QRect *rect = (n == 1 ? &d->qt_rgn->extents : d->qt_rgn->rects.constData());
58  while (n--) {
59  XRectangle r;
60  r.x = qMax(SHRT_MIN, rect->x());
61  r.y = qMax(SHRT_MIN, rect->y());
62  r.width = qMin((int)USHRT_MAX, rect->width());
63  r.height = qMin((int)USHRT_MAX, rect->height());
64  XUnionRectWithRegion(&r, d->rgn, d->rgn);
65  ++rect;
66  }
67 }
68 
69 void *QRegion::clipRectangles(int &num) const
70 {
71  if (!d->xrectangles && !(d == &shared_empty || d->qt_rgn->numRects == 0)) {
72  XRectangle *r = static_cast<XRectangle*>(malloc(d->qt_rgn->numRects * sizeof(XRectangle)));
73  d->xrectangles = r;
74  int n = d->qt_rgn->numRects;
75  const QRect *rect = (n == 1 ? &d->qt_rgn->extents : d->qt_rgn->rects.constData());
76  while (n--) {
77  r->x = qMax(SHRT_MIN, rect->x());
78  r->y = qMax(SHRT_MIN, rect->y());
79  r->width = qMin((int)USHRT_MAX, rect->width());
80  r->height = qMin((int)USHRT_MAX, rect->height());
81  ++r;
82  ++rect;
83  }
84  }
85  if (d == &shared_empty || d->qt_rgn->numRects == 0)
86  num = 0;
87  else
88  num = d->qt_rgn->numRects;
89  return d->xrectangles;
90 }
91 
Q_DECL_CONSTEXPR const T & qMin(const T &a, const T &b)
Definition: qglobal.h:1215
#define QT_END_NAMESPACE
This macro expands to.
Definition: qglobal.h:90
int width() const
Returns the width of the rectangle.
Definition: qrect.h:303
QRegionPrivate * qt_rgn
Definition: qregion.h:211
int height() const
Returns the height of the rectangle.
Definition: qrect.h:306
#define Q_BASIC_ATOMIC_INITIALIZER(a)
Definition: qbasicatomic.h:218
static struct QRegionData shared_empty
Definition: qregion.h:218
Q_DECL_CONSTEXPR const T & qMax(const T &a, const T &b)
Definition: qglobal.h:1217
#define QT_BEGIN_NAMESPACE
This macro expands to.
Definition: qglobal.h:89
QVector< QRect > rects
Definition: qregion.cpp:1227
int y() const
Returns the y-coordinate of the rectangle&#39;s top edge.
Definition: qrect.h:255
int x() const
Returns the x-coordinate of the rectangle&#39;s left edge.
Definition: qrect.h:252
The QRect class defines a rectangle in the plane using integer precision.
Definition: qrect.h:58
const T * constData() const
Returns a const pointer to the data stored in the vector.
Definition: qvector.h:154
struct QRegionData * d
Definition: qregion.h:217