commit 2b2c710d3abf18883fff9d972f8884a898899292
author neo.he <neo.he@mstarsemi.com> Tue Mar 21 11:48:36 2017 +0800
committer Cody Northrop <cnorthrop@google.com> Thu Mar 30 14:05:10 2017 -0600
tree 8215e316006806a396370d39494bf2a1b9b33272
parent 0e7305cb0ab3787cd4767aa3c57d6842ac351663

Add alpha channel for  the EGLConfig

If the alpha channel is not assigned,the framebuffer will be Opaque.
And it will mask the underlying video and make the video invisible
when play video width mediaplayer

cherry-picked from AOSP master

Issue: b/36025630
Test: clean build and boot PixelC
Change-Id: If756ad2aaa789f6ddb178333b3e8854f52c8eac3

services/surfaceflinger/RenderEngine/RenderEngine.cpp

diff --git a/services/surfaceflinger/RenderEngine/RenderEngine.cpp b/services/surfaceflinger/RenderEngine/RenderEngine.cpp
index e3dbecc..7564269 100644
--- a/services/surfaceflinger/RenderEngine/RenderEngine.cpp
+++ b/services/surfaceflinger/RenderEngine/RenderEngine.cpp
@@ -382,6 +382,7 @@
         attribs[EGL_RED_SIZE]                   = 8;
         attribs[EGL_GREEN_SIZE]                 = 8;
         attribs[EGL_BLUE_SIZE]                  = 8;
+        attribs[EGL_ALPHA_SIZE]                 = 8;
         wantedAttribute                         = EGL_NONE;
         wantedAttributeValue                    = EGL_NONE;
     } else {