[WIN32K] Check for empty output rect in GreGradientFill

Fixes a failed ASSERT.
CORE-14148 #resolve

diff --git a/win32ss/gdi/ntgdi/fillshap.c b/win32ss/gdi/ntgdi/fillshap.c
index f3663a6..a42a341 100644 (file)
--- a/win32ss/gdi/ntgdi/fillshap.c
+++ b/win32ss/gdi/ntgdi/fillshap.c
@@ -945,6 +945,12 @@ GreGradientFill(
     rclExtent.top    += pdc->ptlDCOrig.y;
     rclExtent.bottom += pdc->ptlDCOrig.y;
 
+    if (RECTL_bIsEmptyRect(&rclExtent))
+    {
+        DC_UnlockDc(pdc);
+        return TRUE;
+    }
+
     ptlDitherOrg.x = ptlDitherOrg.y = 0;
     IntLPtoDP(pdc, (LPPOINT)&ptlDitherOrg, 1);