Implement SurfaceTexture frame-available callback.

This change implements the onFrameAvailable callback for the
SurfaceTexture java class.  It includes the C++ SurfaceTexture code as
well as the JNI and Java code to enable the callback.

Change-Id: Ifd8b8e7ad46ee70cba6da1c2e96dab8045d1ea30

1 files changed, 13 insertions, 0 deletions

diff --git a/include/gui/SurfaceTexture.h b/include/gui/SurfaceTexture.h
index 002e48b..79c33f5 100644
--- a/include/gui/SurfaceTexture.h
+++ b/include/gui/SurfaceTexture.h
@@ -40,6 +40,10 @@ public:
     enum { MIN_BUFFER_SLOTS = 3 };
     enum { NUM_BUFFER_SLOTS = 32 };
 
+    struct FrameAvailableListener : public virtual RefBase {
+        virtual void onFrameAvailable() = 0;
+    };
+
     // tex indicates the name OpenGL texture to which images are to be streamed.
     // This texture name cannot be changed once the SurfaceTexture is created.
     SurfaceTexture(GLuint tex);
@@ -93,6 +97,10 @@ public:
     // functions.
     void getTransformMatrix(float mtx[16]);
 
+    // setFrameAvailableListener sets the listener object that will be notified
+    // when a new frame becomes available.
+    void setFrameAvailableListener(const sp<FrameAvailableListener>& l);
+
 private:
 
     // freeAllBuffers frees the resources (both GraphicBuffer and EGLImage) for
@@ -195,6 +203,11 @@ private:
     // to a buffer, but other processes do.
     Vector<sp<GraphicBuffer> > mAllocdBuffers;
 
+    // mFrameAvailableListener is the listener object that will be called when a
+    // new frame becomes available. If it is not NULL it will be called from
+    // queueBuffer.
+    sp<FrameAvailableListener> mFrameAvailableListener;
+
     // mMutex is the mutex used to prevent concurrent access to the member
     // variables of SurfaceTexture objects. It must be locked whenever the
     // member variables are accessed.