dom/media/BackgroundVideoDecodingPermissionObserver.h
author Mike Hommey <mh+mozilla@glandium.org>
Fri, 11 Jan 2019 16:01:15 +0000
changeset 453570 daf50f25895db073e44d50fecf2e4f6fe873865d
parent 452446 f0a91d36587266d7454a450c6044d573664fbed5
child 454520 5f4630838d46dd81dadb13220a4af0da9e23a619
permissions -rw-r--r--
Bug 1519307 - Add a new project to build useful parts of breakpad independently. r=froydnj With `ac_add_options --enable-project=tools/crashreporter` in a mozconfig, `./mach build` builds minidump_stackwalk, dump_syms and fileid. One caveat is that due to limitation in how the build system works currently, it's cumbersome to keep dump_syms as a host program for Gecko, and to make it a target program for this project. For now, keep it as a host program. We're not going to use it on automation, but it's still convenient to have for quick local builds (I've had to resort to awful hacks downstream). Differential Revision: https://phabricator.services.mozilla.com/D16299

/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#if !defined(BackgroundVideoDecodingPermissionObserver_h_)
#define BackgroundVideoDecodingPermissionObserver_h_

#include "nsIObserver.h"
#include "nsISupportsImpl.h"

class nsISupports;
class nsPIDOMWindowOuter;

namespace mozilla {

namespace dom {
class Document;
}

class MediaDecoder;

class BackgroundVideoDecodingPermissionObserver final : public nsIObserver {
 public:
  NS_DECL_ISUPPORTS

  explicit BackgroundVideoDecodingPermissionObserver(MediaDecoder* aDecoder);

  NS_IMETHOD Observe(nsISupports* aSubject, const char* aTopic,
                     const char16_t* aData) override;
  void RegisterEvent();
  void UnregisterEvent();

 private:
  ~BackgroundVideoDecodingPermissionObserver();
  void EnableEvent() const;
  void DisableEvent() const;
  already_AddRefed<nsPIDOMWindowOuter> GetOwnerWindow() const;
  dom::Document* GetOwnerDoc() const;
  bool IsValidEventSender(nsISupports* aSubject) const;

  // The life cycle of observer would always be shorter than decoder, so we
  // use raw pointer here.
  MediaDecoder* mDecoder;
  bool mIsRegisteredForEvent;
};

}  // namespace mozilla

#endif  // BackgroundVideoDecodingPermissionObserver_h_