uxa: In change_window_attributes() only read back if the backing pixmap changed

This speeds up log in time considerably.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/uxa/uxa.c b/src/uxa/uxa.c
index 141c497..7d6efe1 100644
--- a/src/uxa/uxa.c
+++ b/src/uxa/uxa.c
@@ -335,11 +335,16 @@ void uxa_finish_access_window(WindowPtr pWin)
 static Bool uxa_change_window_attributes(WindowPtr pWin, unsigned long mask)
 {
 	Bool ret;
+	Bool need_access = !!(mask & (CWBackPixmap | CWBorderPixmap));
 
-	if (!uxa_prepare_access_window(pWin))
+	if (need_access)
+	{
+	    if (!uxa_prepare_access_window(pWin))
 		return FALSE;
+	}
 	ret = fbChangeWindowAttributes(pWin, mask);
-	uxa_finish_access_window(pWin);
+	if (need_access)
+	    uxa_finish_access_window(pWin);
 	return ret;
 }