From 07510ca0605cc81f6d3954a17a985184565a0135 Mon Sep 17 00:00:00 2001
From: Benoit Girard <b56girard@gmail.com>
Date: Tue, 12 Aug 2014 18:46:16 -0400
Subject: [PATCH] Bug 1052857 - Overdraw should report dst pixels, not src
 pixels. r=jrmuizel

---
 gfx/layers/opengl/CompositorOGL.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/gfx/layers/opengl/CompositorOGL.cpp b/gfx/layers/opengl/CompositorOGL.cpp
index aff372271f7d..60ea8ffbff1d 100644
--- a/gfx/layers/opengl/CompositorOGL.cpp
+++ b/gfx/layers/opengl/CompositorOGL.cpp
@@ -1059,7 +1059,12 @@ CompositorOGL::DrawQuad(const Rect& aRect,
     maskType = MaskType::MaskNone;
   }
 
-  mPixelsFilled += aRect.width * aRect.height;
+  {
+    // XXX: This doesn't handle 3D transforms. It also doesn't handled rotated
+    //      quads. Fix me.
+    const Rect destRect = aTransform.TransformBounds(aRect);
+    mPixelsFilled += destRect.width * destRect.height;
+  }
 
   // Determine the color if this is a color shader and fold the opacity into
   // the color since color shaders don't have an opacity uniform.