upstream SurfaceTextureListener and SurfaceTextureBridge class for android

content/common/android/surface_texture_bridge.h

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_COMMON_ANDROID_SURFACE_TEXTURE_BRIDGE_H_
+#define CONTENT_COMMON_ANDROID_SURFACE_TEXTURE_BRIDGE_H_
+#pragma once
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/callback.h"
+
+namespace content {
+
+// This class serves as a bridge for native code to call java functions inside
+// android SurfaceTexture class.
+class SurfaceTextureBridge {
+ public:
+  explicit SurfaceTextureBridge(int texture_id);
+  ~SurfaceTextureBridge();
+
+  // Set the listener callback, which will be invoked on the same thread that
+  // is being called from here for registration.
+  // Note: Since callbacks come in from Java objects that might outlive objects
+  // being referenced from the callback, the only robust way here is to create
+  // the callback from a weak pointer to your object.
+  void SetFrameAvailableCallback(const base::Closure& callback);
+
+  // Update the texture image to the most recent frame from the image stream.
+  void UpdateTexImage();
+
+  // Retrieve the 4x4 texture coordinate transform matrix associated with the
+  // texture image set by the most recent call to updateTexImage.
+  void GetTransformMatrix(float mtx[16]);
+
+  // Set the default size of the image buffers.
+  void SetDefaultBufferSize(int width, int height);
+
+  int texture_id() const {
+    return texture_id_;
+  }
+
+  const base::android::JavaRef<jobject>& j_surface_texture() const {
+    return j_surface_texture_;
+  }
+
+ private:
+  const int texture_id_;
+
+  // Java SurfaceTexture class and instance.
+  base::android::ScopedJavaGlobalRef<jclass> j_class_;
+  base::android::ScopedJavaGlobalRef<jobject> j_surface_texture_;
+
+  DISALLOW_COPY_AND_ASSIGN(SurfaceTextureBridge);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_ANDROID_SURFACE_TEXTURE_BRIDGE_H_