content/browser/compositor/owned_mailbox.h

// Copyright 2014 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_BROWSER_COMPOSITOR_OWNED_MAILBOX_H_
#define CONTENT_BROWSER_COMPOSITOR_OWNED_MAILBOX_H_

#include <stdint.h>

#include "base/memory/ref_counted.h"
#include "content/browser/compositor/image_transport_factory.h"
#include "content/common/content_export.h"
#include "gpu/command_buffer/common/mailbox_holder.h"
#include "ui/compositor/compositor.h"

namespace display_compositor {
class GLHelper;
}

namespace content {


// This class holds a texture id and gpu::Mailbox, and deletes the texture
// id when the object itself is destroyed. Should only be created if a GLHelper
// exists on the ImageTransportFactory.
class CONTENT_EXPORT OwnedMailbox : public base::RefCounted<OwnedMailbox>,
                                    public ui::ContextFactoryObserver {
 public:
  explicit OwnedMailbox(display_compositor::GLHelper* gl_helper);

  const gpu::MailboxHolder& holder() const { return mailbox_holder_; }
  const gpu::Mailbox& mailbox() const { return mailbox_holder_.mailbox; }
  const gpu::SyncToken& sync_token() const {
    return mailbox_holder_.sync_token;
  }
  uint32_t texture_id() const { return texture_id_; }
  uint32_t target() const { return mailbox_holder_.texture_target; }
  void UpdateSyncToken(const gpu::SyncToken& sync_token);
  void Destroy();

 protected:
  ~OwnedMailbox() override;

  // ImageTransportFactoryObserver implementation.
  void OnLostResources() override;

 private:
  friend class base::RefCounted<OwnedMailbox>;

  uint32_t texture_id_;
  gpu::MailboxHolder mailbox_holder_;
  display_compositor::GLHelper* gl_helper_;
};

}  // namespace content

#endif  // CONTENT_BROWSER_COMPOSITOR_OWNED_MAILBOX_H_