From 3a6b160a3b52cd96fb383d5ee93c22e5e938e0e2 Mon Sep 17 00:00:00 2001
From: Mathias Agopian <mathias@google.com>
Date: Mon, 29 Jun 2009 18:53:53 -0700
Subject: [PATCH] when there is a choice between UPDATE_ON_DEMAND and
 SWAP_BUFFER optimizations, choose UPDATE_ON_DEMAND which is often more
 efficient.

---
 libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp b/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
index 3ce93c05d474b..5c522c5453ef8 100644
--- a/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
+++ b/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
@@ -211,7 +211,12 @@ void DisplayHardware::init(uint32_t dpy)
     if (strstr(egl_extensions, "EGL_ANDROID_swap_rectangle")) {
         mFlags |= SWAP_RECTANGLE;
     }
+    // when we have the choice between UPDATE_ON_DEMAND and SWAP_RECTANGLE
+    // choose UPDATE_ON_DEMAND, which is more efficient
+    if (mFlags & UPDATE_ON_DEMAND)
+        mFlags &= ~SWAP_RECTANGLE;
 #endif
+    
 
     mDpiX = mNativeWindow->xdpi;
     mDpiX = mNativeWindow->ydpi;