commit 7d89d06a6fe1bfadfe277f19dbb7e4aa021444e0
author Dan Stoza <stoza@google.com> Thu Apr 30 13:29:25 2015 -0700
committer Dan Stoza <stoza@google.com> Thu Apr 30 15:10:00 2015 -0700
tree e4bc2cff57d40c689c8b325a94f67ce02883e381
parent 84f1d9c288f35fa399f97207b6af43a261d5989a

SurfaceFlinger: Limit to 4k Layers

Sets a limit of 4k Layers which SurfaceFlinger will allow to be in
existence at any given time. An attempt to create Layers in excess of
this limit will fail with NO_MEMORY.

Bug: 20674586
Change-Id: I2dfaf59643d826f982b2fa44e8a9ed643176d972
(cherry picked from commit e7f8dde3f3c398c1ea1bec14e76725a760f71d31)

services/surfaceflinger/SurfaceFlinger.h

diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index d2654d4..3759a92 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -144,6 +144,8 @@
     // every half hour.
     enum { LOG_FRAME_STATS_PERIOD =  30*60*60 };
 
+    static const size_t MAX_LAYERS = 4096;
+
     // We're reference counted, never destroy SurfaceFlinger directly
     virtual ~SurfaceFlinger();
 
@@ -305,7 +307,7 @@
     status_t removeLayer(const sp<Layer>& layer);
 
     // add a layer to SurfaceFlinger
-    void addClientLayer(const sp<Client>& client,
+    status_t addClientLayer(const sp<Client>& client,
             const sp<IBinder>& handle,
             const sp<IGraphicBufferProducer>& gbc,
             const sp<Layer>& lbc);