am ecb4b3f0: Merge "Pass the IGraphicBufferAlloc to SurfaceTextureClient." into honeycomb

* commit 'ecb4b3f02340e21eefabbea78559e85ec7ee0089':
  Pass the IGraphicBufferAlloc to SurfaceTextureClient.

include/gui/ISurfaceTexture.h

@@ -72,6 +72,12 @@ public:
 
     virtual status_t setCrop(const Rect& reg) = 0;
     virtual status_t setTransform(uint32_t transform) = 0;
+
+    // getAllocator retrieves the binder object that must be referenced as long
+    // as the GraphicBuffers dequeued from this ISurfaceTexture are referenced.
+    // Holding this binder reference prevents SurfaceFlinger from freeing the
+    // buffers before the client is done with them.
+    virtual sp<IBinder> getAllocator() = 0;
 };
 
 // ----------------------------------------------------------------------------

include/gui/SurfaceTexture.h

@@ -101,6 +101,12 @@ public:
     // when a new frame becomes available.
     void setFrameAvailableListener(const sp<FrameAvailableListener>& l);
 
+    // getAllocator retrieves the binder object that must be referenced as long
+    // as the GraphicBuffers dequeued from this SurfaceTexture are referenced.
+    // Holding this binder reference prevents SurfaceFlinger from freeing the
+    // buffers before the client is done with them.
+    sp<IBinder> getAllocator();
+
 private:
 
     // freeAllBuffers frees the resources (both GraphicBuffer and EGLImage) for

include/gui/SurfaceTextureClient.h

@@ -83,6 +83,10 @@ private:
     // interactions with the server using this interface.
     sp<ISurfaceTexture> mSurfaceTexture;
 
+    // mAllocator is the binder object that is referenced to prevent the
+    // dequeued buffers from being freed prematurely.
+    sp<IBinder> mAllocator;
+
     // mSlots stores the buffers that have been allocated for each buffer slot.
     // It is initialized to null pointers, and gets filled in with the result of
     // ISurfaceTexture::requestBuffer when the client dequeues a buffer from a

libs/gui/ISurfaceTexture.cpp

@@ -38,6 +38,7 @@ enum {
     CANCEL_BUFFER,
     SET_CROP,
     SET_TRANSFORM,
+    GET_ALLOCATOR,
 };
 
 
@@ -123,6 +124,13 @@ public:
         status_t result = reply.readInt32();
         return result;
     }
+
+    virtual sp<IBinder> getAllocator() {
+        Parcel data, reply;
+        data.writeInterfaceToken(ISurfaceTexture::getInterfaceDescriptor());
+        remote()->transact(GET_ALLOCATOR, data, &reply);
+        return reply.readStrongBinder();
+    }
 };
 
 IMPLEMENT_META_INTERFACE(SurfaceTexture, "android.gui.SurfaceTexture");
@@ -195,6 +203,12 @@ status_t BnSurfaceTexture::onTransact(
             reply->writeInt32(result);
             return NO_ERROR;
         } break;
+        case GET_ALLOCATOR: {
+            CHECK_INTERFACE(ISurfaceTexture, data, reply);
+            sp<IBinder> result = getAllocator();
+            reply->writeStrongBinder(result);
+            return NO_ERROR;
+        } break;
     }
     return BBinder::onTransact(code, data, reply, flags);
 }

libs/gui/SurfaceTexture.cpp

@@ -304,6 +304,11 @@ void SurfaceTexture::setFrameAvailableListener(
     mFrameAvailableListener = l;
 }
 
+sp<IBinder> SurfaceTexture::getAllocator() {
+    LOGV("SurfaceTexture::getAllocator");
+    return mGraphicBufferAlloc->asBinder();
+}
+
 void SurfaceTexture::freeAllBuffers() {
     for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
         mSlots[i].mGraphicBuffer = 0;

libs/gui/SurfaceTextureClient.cpp

@@ -25,8 +25,8 @@ namespace android {
 
 SurfaceTextureClient::SurfaceTextureClient(
         const sp<ISurfaceTexture>& surfaceTexture):
-        mSurfaceTexture(surfaceTexture), mReqWidth(1), mReqHeight(1),
-        mReqFormat(DEFAULT_FORMAT), mReqUsage(0), mMutex() {
+        mSurfaceTexture(surfaceTexture), mAllocator(0), mReqWidth(1),
+        mReqHeight(1), mReqFormat(DEFAULT_FORMAT), mReqUsage(0), mMutex() {
     // Initialize the ANativeWindow function pointers.
     ANativeWindow::setSwapInterval  = setSwapInterval;
     ANativeWindow::dequeueBuffer    = dequeueBuffer;
@@ -35,6 +35,9 @@ SurfaceTextureClient::SurfaceTextureClient(
     ANativeWindow::queueBuffer      = queueBuffer;
     ANativeWindow::query            = query;
     ANativeWindow::perform          = perform;
+
+    // Get a reference to the allocator.
+    mAllocator = mSurfaceTexture->getAllocator();
 }
 
 int SurfaceTextureClient::setSwapInterval(ANativeWindow* window, int interval) {