From 1db73f66624e7d151710483dd58e03eed672f064 Mon Sep 17 00:00:00 2001
From: Robert Carr <racarr@google.com>
Date: Wed, 21 Dec 2016 12:58:51 -0800
Subject: SurfaceFlinger: Add support for non-privileged clients.

Allow clients without privilege to create child layers through scoped
connections. We enable this in preparation for allowing SurfaceView
to bypass the WindowManager. We include support for reparenting of
all of a layer's children for the WindowManager to use in cases where
one surface is replacing another (while keeping its children around).

Test: Tested with corresponding SurfaceView modifications.
Change-Id: I9920e6730d719113522a68788e63fb59f70d3406
---
 libs/gui/ISurfaceComposer.cpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'libs/gui/ISurfaceComposer.cpp')

diff --git a/libs/gui/ISurfaceComposer.cpp b/libs/gui/ISurfaceComposer.cpp
index 74c3bedf98..2a327da07d 100644
--- a/libs/gui/ISurfaceComposer.cpp
+++ b/libs/gui/ISurfaceComposer.cpp
@@ -64,6 +64,16 @@ public:
         return interface_cast<ISurfaceComposerClient>(reply.readStrongBinder());
     }
 
+    virtual sp<ISurfaceComposerClient> createScopedConnection(
+            const sp<IGraphicBufferProducer>& parent)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(ISurfaceComposer::getInterfaceDescriptor());
+        data.writeStrongBinder(IInterface::asBinder(parent));
+        remote()->transact(BnSurfaceComposer::CREATE_SCOPED_CONNECTION, data, &reply);
+        return interface_cast<ISurfaceComposerClient>(reply.readStrongBinder());
+    }
+
     virtual sp<IGraphicBufferAlloc> createGraphicBufferAlloc()
     {
         Parcel data, reply;
@@ -489,6 +499,14 @@ status_t BnSurfaceComposer::onTransact(
             reply->writeStrongBinder(b);
             return NO_ERROR;
         }
+        case CREATE_SCOPED_CONNECTION: {
+            CHECK_INTERFACE(ISurfaceComposer, data, reply);
+            sp<IGraphicBufferProducer> bufferProducer =
+                interface_cast<IGraphicBufferProducer>(data.readStrongBinder());
+            sp<IBinder> b = IInterface::asBinder(createScopedConnection(bufferProducer));
+            reply->writeStrongBinder(b);
+            return NO_ERROR;
+        }
         case CREATE_GRAPHIC_BUFFER_ALLOC: {
             CHECK_INTERFACE(ISurfaceComposer, data, reply);
             sp<IBinder> b = IInterface::asBinder(createGraphicBufferAlloc());
-- 
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