From 745b475aa572b921fc9d7a2a5b317b41d0b74483 Mon Sep 17 00:00:00 2001
From: Markus Stange <mstange@themasta.com>
Date: Fri, 24 May 2013 08:12:27 +0200
Subject: [PATCH] Bug 875441 - Don't keep reapplying the 2x scale in HiDPI mode
 when drawing the titlebar buttons. r=mattwoodrow

---
 widget/cocoa/nsChildView.mm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/widget/cocoa/nsChildView.mm b/widget/cocoa/nsChildView.mm
index 5b96d5257eb..763276ca0b0 100644
--- a/widget/cocoa/nsChildView.mm
+++ b/widget/cocoa/nsChildView.mm
@@ -2057,6 +2057,7 @@ nsChildView::UpdateTitlebarImageBuffer()
   ClearRegion(mTitlebarImageBuffer, dirtyTitlebarRegion);
 
   CGContextRef ctx = mTitlebarImageBuffer->GetCGContext();
+  CGContextSaveGState(ctx);
 
   double scale = BackingScaleFactor();
   CGContextScaleCTM(ctx, scale, scale);
@@ -2113,6 +2114,7 @@ nsChildView::UpdateTitlebarImageBuffer()
                         DevPixelsToCocoaPoints(1));
 
   [NSGraphicsContext setCurrentContext:oldContext];
+  CGContextRestoreGState(ctx);
 
   mUpdatedTitlebarRegion.Or(mUpdatedTitlebarRegion, dirtyTitlebarRegion);
 }