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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the QtGui module of the Qt Toolkit.

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    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

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    40 ****************************************************************************/

    41 

    42 #include <private/qt_x11_p.h>

    43 

    44 #include <limits.h>

    45 

    46 QT_BEGIN_NAMESPACE

    47 

    48 QRegion::QRegionData QRegion::shared_empty = {Q_BASIC_ATOMIC_INITIALIZER(1), 0, 0, 0};

    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 

    92 QT_END_NAMESPACE