From bdc3cc556444519def2cdecb00455af9ba4dee3e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20L=C3=BCbking?= <thomas.luebking@gmail.com>
Date: Tue, 8 Nov 2011 20:53:17 +0100
Subject: [PATCH] skip empty damages, reset damageRatio also when pixmaps are
 created

---
 composite.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/composite.cpp b/composite.cpp
index bc29233079..aa721b84c2 100644
--- a/composite.cpp
+++ b/composite.cpp
@@ -558,6 +558,7 @@ Pixmap Toplevel::createWindowPixmap()
     assert(compositing());
     if (unredirected())
         return None;
+    damageRatio = 0.0;
     grabXServer();
     KXErrorHandler err;
     Pixmap pix = XCompositeNameWindowPixmap(display(), frameId());
@@ -667,6 +668,8 @@ void Toplevel::addDamage(int x, int y, int w, int h)
     // resizing the decoration may lag behind a bit and when shrinking there
     // may be a damage event coming with size larger than the current window size
     r &= rect();
+    if (r.isEmpty())
+        return;
     damage_region += r;
     int damageArea = 0;
     foreach (const QRect &r2, damage_region.rects())