From 93dc4d459c70d109e8ba89f883ea99e63242197e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fredrik=20H=C3=B6glund?= <fredrik@kde.org>
Date: Sat, 14 May 2011 18:26:21 +0200
Subject: [PATCH] kwin/blur: Don't blur anything when we're painting
 top-to-bottom

---
 effects/blur/blur.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/effects/blur/blur.cpp b/effects/blur/blur.cpp
index c55064e61b..8a50e07e0c 100644
--- a/effects/blur/blur.cpp
+++ b/effects/blur/blur.cpp
@@ -310,6 +310,12 @@ bool BlurEffect::shouldBlur(const EffectWindow *w, int mask, const WindowPaintDa
     if (!target->valid() || !shader->isValid())
         return false;
 
+    // Don't blur anything if we're painting top-to-bottom
+    if (!(mask & (PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS_WITHOUT_FULL_REPAINTS |
+                  PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS |
+                  PAINT_SCREEN_TRANSFORMED)))
+        return false;
+
     if (effects->activeFullScreenEffect() && !w->data(WindowForceBlurRole).toBool())
         return false;