From c9202e29336398a057016a2e3d2d58d68207ac20 Mon Sep 17 00:00:00 2001
From: Miko Mynttinen <mikokm@gmail.com>
Date: Fri, 20 Jul 2018 17:28:37 +0200
Subject: [PATCH] Bug 1477260 - Clip the rect in
 Matrix4x4TypedFlagged::TransformAndClipBounds, when transform is an identity
 matrix r=bas

MozReview-Commit-ID: 3a8vnl3K87n

--HG--
extra : rebase_source : b4bdd2b14e10becee20007e453497e9d7a204097
---
 gfx/2d/Matrix.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gfx/2d/Matrix.h b/gfx/2d/Matrix.h
index c9e8ef67b2ee..632b7583ae26 100644
--- a/gfx/2d/Matrix.h
+++ b/gfx/2d/Matrix.h
@@ -1907,7 +1907,9 @@ public:
                                                    const RectTyped<TargetUnits, F>& aClip) const
   {
     if (mType == MatrixType::Identity) {
-      return aRect;
+      const RectTyped<SourceUnits, F>& clipped = aRect.Intersect(aClip);
+      return RectTyped<TargetUnits, F>(clipped.X(), clipped.Y(),
+                                       clipped.Width(), clipped.Height());
     }
 
     if (mType == MatrixType::Simple) {