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+// Copyright 2013 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 UI_GL_ANDROID_SURFACE_TEXTURE_H_
+#define UI_GL_ANDROID_SURFACE_TEXTURE_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "ui/gl/gl_export.h"
+
+struct ANativeWindow;
+
+namespace gfx {
+
+// This class serves as a bridge for native code to call java functions inside
+// android SurfaceTexture class.
+class GL_EXPORT SurfaceTexture
+ : public base::RefCountedThreadSafe<SurfaceTexture>{
+ public:
+ explicit SurfaceTexture(int texture_id);
+
+ // 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);
+
+ // Attach the SurfaceTexture to the texture currently bound to
+ // GL_TEXTURE_EXTERNAL_OES.
+ void AttachToGLContext();
+
+ // Detaches the SurfaceTexture from the context that owns its current GL
+ // texture. Must be called with that context current on the calling thread.
+ void DetachFromGLContext();
+
+ // Creates a native render surface for this surface texture.
+ // The caller must release the underlying reference when done with the handle
+ // by calling ANativeWindow_release().
+ ANativeWindow* CreateSurface();
+
+ const base::android::JavaRef<jobject>& j_surface_texture() const {
+ return j_surface_texture_;
+ }
+
+ static bool RegisterSurfaceTexture(JNIEnv* env);
+
+ private:
+ friend class base::RefCountedThreadSafe<SurfaceTexture>;
+ ~SurfaceTexture();
+
+ // Java SurfaceTexture instance.
+ base::android::ScopedJavaGlobalRef<jobject> j_surface_texture_;
+
+ DISALLOW_COPY_AND_ASSIGN(SurfaceTexture);
+};
+
+} // namespace gfx
+
+#endif // UI_GL_ANDROID_SURFACE_TEXTURE_H_