From 3f121fc650d72d0103cef8e6a651093fb1589e0a Mon Sep 17 00:00:00 2001
From: Michael Lentine <mlentine@google.com>
Date: Wed, 1 Oct 2014 11:17:28 -0700
Subject: [PATCH] When eglMakeCurrent fails we need to fix the egl state.

Bug: 16676660

Change-Id: Ie7bee9c78378b9e9206060444319e6ee35e1ab74
---
 services/surfaceflinger/SurfaceFlinger.cpp | 11 ++++++++---
 services/surfaceflinger/SurfaceFlinger.h   |  5 ++++-
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 12f22a7a8..419b24620 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -1743,7 +1743,7 @@ void SurfaceFlinger::doDisplayComposition(const sp<const DisplayDevice>& hw,
     }
 
     if (CC_LIKELY(!mDaltonize && !mHasColorMatrix)) {
-        doComposeSurfaces(hw, dirtyRegion);
+        if (!doComposeSurfaces(hw, dirtyRegion)) return;
     } else {
         RenderEngine& engine(getRenderEngine());
         mat4 colorMatrix = mColorMatrix;
@@ -1762,7 +1762,7 @@ void SurfaceFlinger::doDisplayComposition(const sp<const DisplayDevice>& hw,
     hw->swapBuffers(getHwComposer());
 }
 
-void SurfaceFlinger::doComposeSurfaces(const sp<const DisplayDevice>& hw, const Region& dirty)
+bool SurfaceFlinger::doComposeSurfaces(const sp<const DisplayDevice>& hw, const Region& dirty)
 {
     RenderEngine& engine(getRenderEngine());
     const int32_t id = hw->getHwcDisplayId();
@@ -1775,7 +1775,11 @@ void SurfaceFlinger::doComposeSurfaces(const sp<const DisplayDevice>& hw, const
         if (!hw->makeCurrent(mEGLDisplay, mEGLContext)) {
             ALOGW("DisplayDevice::makeCurrent failed. Aborting surface composition for display %s",
                   hw->getDisplayName().string());
-            return;
+            eglMakeCurrent(mEGLDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+            if(!getDefaultDisplayDevice()->makeCurrent(mEGLDisplay, mEGLContext)) {
+              ALOGE("DisplayDevice::makeCurrent on default display failed. Aborting.");
+            }
+            return false;
         }
 
         // Never touch the framebuffer if we don't have any framebuffer layers
@@ -1883,6 +1887,7 @@ void SurfaceFlinger::doComposeSurfaces(const sp<const DisplayDevice>& hw, const
 
     // disable scissor at the end of the frame
     engine.disableScissor();
+    return true;
 }
 
 void SurfaceFlinger::drawWormhole(const sp<const DisplayDevice>& hw, const Region& region) const {
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 2cc522b1a..710dac712 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -377,7 +377,10 @@ private:
     void doComposition();
     void doDebugFlashRegions();
     void doDisplayComposition(const sp<const DisplayDevice>& hw, const Region& dirtyRegion);
-    void doComposeSurfaces(const sp<const DisplayDevice>& hw, const Region& dirty);
+
+    // compose surfaces for display hw. this fails if using GL and the surface
+    // has been destroyed and is no longer valid.
+    bool doComposeSurfaces(const sp<const DisplayDevice>& hw, const Region& dirty);
 
     void postFramebuffer();
     void drawWormhole(const sp<const DisplayDevice>& hw, const Region& region) const;