[PATCH 1/7] winex11: Only clip huge surfaces to the virtual screen rect.

[Rémi Bernon]

From: Rémi Bernon

---
 dlls/winex11.drv/bitblt.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/dlls/winex11.drv/bitblt.c b/dlls/winex11.drv/bitblt.c
index c4ae4dd522e..715d263028f 100644
--- a/dlls/winex11.drv/bitblt.c
+++ b/dlls/winex11.drv/bitblt.c
@@ -2186,10 +2186,18 @@ HRGN expose_surface( struct window_surface *window_surface, const RECT *rect )

BOOL get_surface_rect( const RECT *visible_rect, RECT *surface_rect )
 {
-    *surface_rect = NtUserGetVirtualScreenRect();
+    RECT virtual_rect = NtUserGetVirtualScreenRect();

-    if (!intersect_rect( surface_rect, surface_rect, visible_rect )) return FALSE;
+    *surface_rect = *visible_rect;
+
+    /* crop surfaces which are larger than the virtual screen rect, some applications create huge windows */
+    if ((surface_rect->right - surface_rect->left > virtual_rect.right - virtual_rect.left ||
+         surface_rect->bottom - surface_rect->top > virtual_rect.bottom - virtual_rect.top) &&
+        !intersect_rect( surface_rect, surface_rect, &virtual_rect ))
+        return FALSE;
     OffsetRect( surface_rect, -visible_rect->left, -visible_rect->top );
+
+    /* round the surface coordinates to avoid re-creating them too often on resize */
     surface_rect->left &= ~31;
     surface_rect->top  &= ~31;
     surface_rect->right  = max( surface_rect->left + 32, (surface_rect->right + 31) & ~31 );