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#include <private/qt_x11_p.h>

#include <limits.h>

QT_BEGIN_NAMESPACE

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

void QRegion::updateX11Region() const

{

    d->rgn = XCreateRegion();

    if (!d->qt_rgn)

        return;

    int n = d->qt_rgn->numRects;

    const QRect *rect = (n == 1 ? &d->qt_rgn->extents : d->qt_rgn->rects.constData());

    while (n--) {

        XRectangle r;

        r.x = qMax(SHRT_MIN, rect->x());

        r.y = qMax(SHRT_MIN, rect->y());

        r.width = qMin((int)USHRT_MAX, rect->width());

        r.height = qMin((int)USHRT_MAX, rect->height());

        XUnionRectWithRegion(&r, d->rgn, d->rgn);

        ++rect;

    }

}

void *QRegion::clipRectangles(int &num) const

{

    if (!d->xrectangles && !(d == &shared_empty || d->qt_rgn->numRects == 0)) {

        XRectangle *r = static_cast<XRectangle*>(malloc(d->qt_rgn->numRects * sizeof(XRectangle)));

        d->xrectangles = r;

        int n = d->qt_rgn->numRects;

        const QRect *rect = (n == 1 ? &d->qt_rgn->extents : d->qt_rgn->rects.constData());

        while (n--) {

            r->x = qMax(SHRT_MIN, rect->x());

            r->y = qMax(SHRT_MIN, rect->y());

            r->width = qMin((int)USHRT_MAX, rect->width());

            r->height = qMin((int)USHRT_MAX, rect->height());

            ++r;

            ++rect;

        }

    }

    if (d == &shared_empty || d->qt_rgn->numRects == 0)

        num = 0;

    else

        num = d->qt_rgn->numRects;

    return d->xrectangles;

}

QT_END_NAMESPACE