From 74a056e746e12a2efc6f8014047eeb20a759004b Mon Sep 17 00:00:00 2001
From: Johannes Schickel
Date: Sun, 18 Aug 2013 20:12:12 +0200
Subject: GUI: Clear dirty rects when initializing ThemeEngine.

This avoids nasty invalid writes to the overlay when the overlay is being
resized.
---
 gui/ThemeEngine.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'gui')

diff --git a/gui/ThemeEngine.cpp b/gui/ThemeEngine.cpp
index 561c0244a2..2abf4a545d 100644
--- a/gui/ThemeEngine.cpp
+++ b/gui/ThemeEngine.cpp
@@ -521,6 +521,12 @@ void ThemeEngine::setGraphicsMode(GraphicsMode mode) {
 	delete _vectorRenderer;
 	_vectorRenderer = Graphics::createRenderer(mode);
 	_vectorRenderer->setSurface(&_screen);
+
+	// Since we reinitialized our screen surfaces we know nothing has been
+	// drawn so far. Sometimes we still end up with dirty screen bits in the
+	// list. Clearing it avoids invalid overlay writes when the backend
+	// resizes the overlay.
+	_dirtyScreen.clear();
 }
 
 void WidgetDrawData::calcBackgroundOffset() {
-- 
cgit v1.2.3