From 357ee6d8dc19a916a4a9aea2e779a982204a6eaf Mon Sep 17 00:00:00 2001
From: Naseer Ahmed <naseer@codeaurora.org>
Date: Mon, 27 Aug 2012 13:49:18 -0400
Subject: [PATCH] hwc: Call swap buffers even on NULL lists

Swap buffers and UI mirroring must be done even on NULL lists
which are composed by SurfaceFlinger.

Change-Id: I6c840e3dd02dfa447c10bf3f4798114fc74536ee
---
 libhwcomposer/hwc.cpp | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/libhwcomposer/hwc.cpp b/libhwcomposer/hwc.cpp
index 91101d3..378f33d 100644
--- a/libhwcomposer/hwc.cpp
+++ b/libhwcomposer/hwc.cpp
@@ -173,19 +173,21 @@ static int hwc_set(hwc_composer_device_t *dev,
 {
     int ret = 0;
     hwc_context_t* ctx = (hwc_context_t*)(dev);
-    if (LIKELY(list)) {
-        VideoOverlay::draw(ctx, list);
-        VideoPIP::draw(ctx,list);
-        ExtOnly::draw(ctx, list);
-        CopyBit::draw(ctx, list, (EGLDisplay)dpy, (EGLSurface)sur);
-        MDPComp::draw(ctx, list);
-        EGLBoolean sucess = eglSwapBuffers((EGLDisplay)dpy, (EGLSurface)sur);
+    if (dpy && sur) {
+        if (LIKELY(list)) {
+            VideoOverlay::draw(ctx, list);
+            VideoPIP::draw(ctx,list);
+            ExtOnly::draw(ctx, list);
+            CopyBit::draw(ctx, list, (EGLDisplay)dpy, (EGLSurface)sur);
+            MDPComp::draw(ctx, list);
+        }
+        eglSwapBuffers((EGLDisplay)dpy, (EGLSurface)sur);
         wait4fbPost(ctx);
         //Can draw to HDMI only when fb_post is reached
         UIMirrorOverlay::draw(ctx);
         //HDMI commit and primary commit (PAN) happening in parallel
         if(ctx->mExtDisplay->getExternalDisplay())
-           ctx->mExtDisplay->commit();
+            ctx->mExtDisplay->commit();
         //Virtual barrier for threads to finish
         wait4Pan(ctx);
     } else {