From ac68302e1cde8b931073929311fd6654a3253fc7 Mon Sep 17 00:00:00 2001
From: Mathias Agopian <mathias@google.com>
Date: Tue, 1 Oct 2013 15:36:52 -0700
Subject: [PATCH] only clear FB when asked for the opaque layer

a layer need to be considered NOT opaque if it has a
plane-alpha.

Bug: 10846930
Change-Id: Ibd8981b63ede4560c7096bacc4cff46a7eb2a8bb
---
 services/surfaceflinger/SurfaceFlinger.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 4f139feda..b0ce52fcc 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -1597,9 +1597,10 @@ void SurfaceFlinger::doComposeSurfaces(const sp<const DisplayDevice>& hw, const
             if (!clip.isEmpty()) {
                 switch (cur->getCompositionType()) {
                     case HWC_OVERLAY: {
+                        const Layer::State& state(layer->getDrawingState());
                         if ((cur->getHints() & HWC_HINT_CLEAR_FB)
                                 && i
-                                && layer->isOpaque()
+                                && layer->isOpaque() && (state.alpha == 0xFF)
                                 && hasGlesComposition) {
                             // never clear the very first layer since we're
                             // guaranteed the FB is already cleared