From 9a990c8ad4552e98587303c12d8cdcaf7790f1ec Mon Sep 17 00:00:00 2001
From: Bas Schouten <bschouten@mozilla.com>
Date: Thu, 3 May 2012 23:31:02 +0200
Subject: [PATCH] Bug 738413 - Part 1: Add OpaqueRect API to Azure DrawTargets.
 r=roc

---
 gfx/2d/2D.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/gfx/2d/2D.h b/gfx/2d/2D.h
index d8be372ffa3..0c00f5c9b00 100644
--- a/gfx/2d/2D.h
+++ b/gfx/2d/2D.h
@@ -779,9 +779,23 @@ public:
   void *GetUserData(UserDataKey *key) {
     return mUserData.Get(key);
   }
+
+  /* Within this rectangle all pixels will be opaque by the time the result of
+   * this DrawTarget is first used for drawing. Either by the underlying surface
+   * being used as an input to external drawing, or Snapshot() being called.
+   * This rectangle is specified in device space.
+   */
+  void SetOpaqueRect(const IntRect &aRect) {
+    mOpaqueRect = aRect;
+  }
+
+  const IntRect &GetOpaqueRect() const {
+    return mOpaqueRect;
+  }
 protected:
   UserData mUserData;
   Matrix mTransform;
+  IntRect mOpaqueRect;
   bool mTransformDirty : 1;
 
   SurfaceFormat mFormat;