OpenVG: use the correct clip region to detect single-rect clips

"Special case: if the intersection of the system clip and the region
is a single rectangle, then use the scissor for clipping."  It was
doing the intersection but then didn't use the intersection to test
for the single-rectangle case.

Task-number: QT-64
Reviewed-by: trustme

1 files changed, 2 insertions, 2 deletions

diff --git a/src/openvg/qpaintengine_vg.cpp b/src/openvg/qpaintengine_vg.cpp
index c7fe604..8ce3f69 100644
--- a/src/openvg/qpaintengine_vg.cpp
+++ b/src/openvg/qpaintengine_vg.cpp
@@ -1656,10 +1656,10 @@ void QVGPaintEngine::clip(const QRegion &region, Qt::ClipOperation op)
                     clip = r;
                 else
                     clip = clip.intersect(r);
-                if (r.numRects() == 1) {
+                if (clip.numRects() == 1) {
                     d->maskValid = false;
                     d->maskIsSet = false;
-                    d->maskRect = r.boundingRect();
+                    d->maskRect = clip.boundingRect();
                     vgSeti(VG_MASKING, VG_FALSE);
                     updateScissor();
                 } else {