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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