QRegion::QRegion( const QRect &r, RegionType t )
{
data = new QRegionData;
Q_CHECK_PTR( data );
data->hgt = 0;
data->is_null = FALSE;
if ( r.isEmpty() ) {
data->rgn = 0;
} else {
HPS hps = qt_display_ps();
if ( t == Rectangle ) { // rectangular region
RECTL rcl = { r.left(), -(r.bottom()+1), r.right()+1, -r.top() };
data->rgn = GpiCreateRegion( hps, 1, &rcl );
} else if ( t == Ellipse ) { // elliptic region
// if the width or height of the ellipse is odd, GPI always
// converts it to a nearest even value, which is obviously stupid
// (see also QPainter::drawArcInternal()). So, we don't use
// GpiCreateEllipticRegion(), but create an array of points to
// call GpiCreatePolygonRegion() instead.
QPointArray a;
a.makeArc( r.x(), r.y(), r.width(), r.height(), 0, 360 * 16 );
for ( uint i = 0; i < a.size(); ++ i )
a[i].ry() = -(a[i].y() + 1);
// GpiCreatePolygonRegion() is bogus and always starts a poligon from
// the current position. Make the last point the current one and reduce
// the number of points by one.
GpiMove( hps, (PPOINTL) &a[ a.size() - 1 ] );
POLYGON poly = { a.size() - 1, (PPOINTL) a.data() };
data->rgn = GpiCreatePolygonRegion( hps, 1, &poly, POLYGON_ALTERNATE );
}
}
}
QRegion::QRegion( const QPointArray &a, bool winding )
{
data = new QRegionData;
CHECK_PTR( data );
data->is_null = FALSE;
data->rgn = XPolygonRegion( (XPoint*)a.data(), a.size(),
winding ? WindingRule : EvenOddRule );
}
QRegion::QRegion( const QRect &r, RegionType t )
{
QRect rr = r.normalize();
data = new QRegionData;
CHECK_PTR( data );
data->is_null = FALSE;
if ( t == Rectangle ) { // rectangular region
data->rgn = XCreateRegion();
XRectangle xr;
xr.x = rr.x();
xr.y = rr.y();
xr.width = rr.width();
xr.height = rr.height();
XUnionRectWithRegion( &xr, data->rgn, data->rgn );
} else if ( t == Ellipse ) { // elliptic region
QPointArray a;
a.makeEllipse( rr.x(), rr.y(), rr.width(), rr.height() );
data->rgn = XPolygonRegion( (XPoint*)a.data(), a.size(), EvenOddRule );
}
}
