From a55bd0e5fc8c285e02ee2d226e5969fc040b8816 Mon Sep 17 00:00:00 2001
From: Tobias Schneider <schneider@jancona.com>
Date: Fri, 2 Jun 2017 13:36:13 -0700
Subject: [PATCH] Bug 1369870 - Float to int cast in
 nsLayoutUtils::TransformRect is losing precision. r=mstange

---
 layout/base/nsLayoutUtils.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
index e3f208db0e50..8a1567bb8877 100644
--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -2865,10 +2865,10 @@ nsLayoutUtils::TransformRect(nsIFrame* aFromFrame, nsIFrame* aToFrame,
          -std::numeric_limits<Float>::max() * devPixelsPerAppUnitFromFrame * 0.5f,
          std::numeric_limits<Float>::max() * devPixelsPerAppUnitFromFrame,
          std::numeric_limits<Float>::max() * devPixelsPerAppUnitFromFrame));
-  aRect.x = toDevPixels.x / devPixelsPerAppUnitToFrame;
-  aRect.y = toDevPixels.y / devPixelsPerAppUnitToFrame;
-  aRect.width = toDevPixels.width / devPixelsPerAppUnitToFrame;
-  aRect.height = toDevPixels.height / devPixelsPerAppUnitToFrame;
+  aRect.x = NSToCoordRound(toDevPixels.x / devPixelsPerAppUnitToFrame);
+  aRect.y = NSToCoordRound(toDevPixels.y / devPixelsPerAppUnitToFrame);
+  aRect.width = NSToCoordRound(toDevPixels.width / devPixelsPerAppUnitToFrame);
+  aRect.height = NSToCoordRound(toDevPixels.height / devPixelsPerAppUnitToFrame);
   return TRANSFORM_SUCCEEDED;
 }