AVDACodecImages keep a reference to the SurfaceTexture backing them

content/common/gpu/media/avda_shared_state.h

 // Copyright 2015 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_GPU_AVDA_SHARED_STATE_H_
 #define CONTENT_COMMON_GPU_AVDA_SHARED_STATE_H_
 
+#include "base/macros.h"
 #include "base/synchronization/waitable_event.h"
-#include "gpu/command_buffer/service/gles2_cmd_decoder.h"
-#include "media/base/android/media_codec_bridge.h"
-#include "media/base/android/sdk_media_codec_bridge.h"
+#include "ui/gl/android/surface_texture.h"
+#include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
-#include "ui/gl/gl_image.h"
 #include "ui/gl/gl_surface.h"
 
-namespace gfx {
-class SurfaceTexture;
-}
-
 namespace content {
 
-// Shared state to allow communication between the AVDA and the
-// GLImages that configure GL for drawing the frames.
+// Shared state to allow communication between
+// AndroidDeferredRenderingBackingStrategy and the AVDACodecImages it creates.
+// It's refcounted so that it lives as long as the images that refer to it.
 class AVDASharedState : public base::RefCounted<AVDASharedState> {
  public:
   AVDASharedState();
 
   GLint surface_texture_service_id() const {
     return surface_texture_service_id_;
   }
 
   // Set the SurfaceTexture's client texture name, which the SurfaceTexture
-  // might not know about yet (see surface_texture_is_attached()).
-  void set_surface_texture_service_id(GLint id) {
-    surface_texture_service_id_ = id;
+  // might not know about yet (see surface_texture_is_attached()). Ownership of
+  // the texture is passed to this object. When it's destructed it will call
+  // the passed callback to delete it.
+  void SetSurfaceTextureServiceID(
+      GLuint id,
+      const base::Callback<void(GLuint)>& delete_texture_cb);
+
+  scoped_refptr<gfx::SurfaceTexture> surface_texture() const {
+    return surface_texture_;
   }
 
-  // Signal the "frame available" event.  This may be called from any thread.
-  void SignalFrameAvailable();
-
-  void WaitForFrameAvailable();
+  void set_surface_texture(
+      const scoped_refptr<gfx::SurfaceTexture>& surface_texture) {
+    surface_texture_ = surface_texture;
+  }
 
   // Context that the surface texture is bound to, or nullptr if it is not in
   // the attached state.
   gfx::GLContext* context() const { return context_.get(); }
 
   gfx::GLSurface* surface() const { return surface_.get(); }
 
   bool surface_texture_is_attached() const {
     return surface_texture_is_attached_;
   }
 
+  // Signal the "frame available" event.  This may be called from any thread.
+  void SignalFrameAvailable();
+
+  void WaitForFrameAvailable();
+
   // Call this when the SurfaceTexture is attached to a GL context.  This will
   // update surface_texture_is_attached(), and set the context() and surface()
   // to match.
-  void did_attach_surface_texture();
+  void DidAttachSurfaceTexture();
 
  private:
-  // Platform gl texture Id for |surface_texture_|.  This will be zero if
-  // and only if |texture_owner_| is null.
-  // TODO(liberato): This should be GLuint, but we don't seem to have the type.
-  GLint surface_texture_service_id_;
+  friend class base::RefCounted<AVDASharedState>;
+  virtual ~AVDASharedState();
+
+  // Platform gl texture ID for |surface_texture_|.
+  GLuint surface_texture_service_id_;
+  // Valid when |surface_texture_service_id_| is valid. Used to delete it.
+  base::Callback<void(GLuint)> delete_texture_cb_;
+
+  scoped_refptr<gfx::SurfaceTexture> surface_texture_;
 
   // For signalling OnFrameAvailable().
   base::WaitableEvent frame_available_event_;
 
   // True if and only if the surface texture is currently attached.
   bool surface_texture_is_attached_;
 
   // Context and surface that the surface texture is attached to, if it is
   // currently attached.
   scoped_refptr<gfx::GLContext> context_;
   scoped_refptr<gfx::GLSurface> surface_;
 
- protected:
-  virtual ~AVDASharedState();
-
- private:
-  friend class base::RefCounted<AVDASharedState>;
+  DISALLOW_COPY_AND_ASSIGN(AVDASharedState);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_AVDA_SHARED_STATE_H_