From 01e29054e672301e4adbbca15b3562a59a20f267 Mon Sep 17 00:00:00 2001
From: Jesse Hall <jessehall@google.com>
Date: Tue, 19 Feb 2013 16:13:35 -0800
Subject: [PATCH] Init displays to null layer stack

When a display is added, initialize it to use an empty layer stack, so
if it is somehow visible it will show black. It will be assigned the
real layer stack -- along with a projection and other properties -- by
window manager soon. Normally a display remains blanked until window
manager has decided what to show on it, but for HDMI connected at boot
that isn't currently the case.

Bug: 7258935
Change-Id: Ic9bb25f7a9b8d9d3772b097ab1d6fa03bc8780a1
---
 services/surfaceflinger/DisplayDevice.cpp  |  6 +++---
 services/surfaceflinger/DisplayDevice.h    |  6 +++++-
 services/surfaceflinger/SurfaceFlinger.cpp | 10 ++++++----
 3 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/services/surfaceflinger/DisplayDevice.cpp b/services/surfaceflinger/DisplayDevice.cpp
index 946694449..4fc9c6a3d 100644
--- a/services/surfaceflinger/DisplayDevice.cpp
+++ b/services/surfaceflinger/DisplayDevice.cpp
@@ -89,7 +89,7 @@ DisplayDevice::DisplayDevice(
       mIsSecure(isSecure),
       mSecureLayerVisible(false),
       mScreenAcquired(false),
-      mLayerStack(0),
+      mLayerStack(NO_LAYER_STACK),
       mOrientation()
 {
     init(config);
@@ -196,13 +196,13 @@ void DisplayDevice::flip(const Region& dirty) const
     EGLDisplay dpy = mDisplay;
     EGLSurface surface = mSurface;
 
-#ifdef EGL_ANDROID_swap_rectangle    
+#ifdef EGL_ANDROID_swap_rectangle
     if (mFlags & SWAP_RECTANGLE) {
         const Region newDirty(dirty.intersect(bounds()));
         const Rect b(newDirty.getBounds());
         eglSetSwapRectangleANDROID(dpy, surface,
                 b.left, b.top, b.width(), b.height());
-    } 
+    }
 #endif
 
     mPageFlipCount++;
diff --git a/services/surfaceflinger/DisplayDevice.h b/services/surfaceflinger/DisplayDevice.h
index bb6eb70e9..856366b33 100644
--- a/services/surfaceflinger/DisplayDevice.h
+++ b/services/surfaceflinger/DisplayDevice.h
@@ -65,6 +65,10 @@ public:
         SWAP_RECTANGLE  = 0x00080000,
     };
 
+    enum {
+        NO_LAYER_STACK = 0xFFFFFFFF,
+    };
+
     DisplayDevice(
             const sp<SurfaceFlinger>& flinger,
             DisplayType type,
@@ -117,7 +121,7 @@ public:
 
     void swapBuffers(HWComposer& hwc) const;
     status_t compositionComplete() const;
-    
+
     // called after h/w composer has completed its set() call
     void onSwapBuffersCompleted(HWComposer& hwc) const;
 
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index ee3e93b1a..c8d2eb653 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -1347,7 +1347,7 @@ void SurfaceFlinger::computeVisibleRegions(
         // start with the whole surface at its current location
         const Layer::State& s(layer->drawingState());
 
-        // only consider the layers on the given later stack
+        // only consider the layers on the given layer stack
         if (s.layerStack != layerStack)
             continue;
 
@@ -2072,12 +2072,14 @@ status_t SurfaceFlinger::onLayerDestroyed(const wp<LayerBaseClient>& layer)
 // ---------------------------------------------------------------------------
 
 void SurfaceFlinger::onInitializeDisplays() {
-    // reset screen orientation
+    // reset screen orientation and use primary layer stack
     Vector<ComposerState> state;
     Vector<DisplayState> displays;
     DisplayState d;
-    d.what = DisplayState::eDisplayProjectionChanged;
+    d.what = DisplayState::eDisplayProjectionChanged |
+             DisplayState::eLayerStackChanged;
     d.token = mBuiltinDisplays[DisplayDevice::DISPLAY_PRIMARY];
+    d.layerStack = 0;
     d.orientation = DisplayState::eOrientationDefault;
     d.frame.makeInvalid();
     d.viewport.makeInvalid();
@@ -2901,7 +2903,7 @@ SurfaceFlinger::DisplayDeviceState::DisplayDeviceState()
 }
 
 SurfaceFlinger::DisplayDeviceState::DisplayDeviceState(DisplayDevice::DisplayType type)
-    : type(type), layerStack(0), orientation(0) {
+    : type(type), layerStack(DisplayDevice::NO_LAYER_STACK), orientation(0) {
     viewport.makeInvalid();
     frame.makeInvalid();
 }