| // 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 CHROMECAST_BASE_CAST_RESOURCE_H_ |
| #define CHROMECAST_BASE_CAST_RESOURCE_H_ |
| |
| #include "base/macros.h" |
| |
| namespace chromecast { |
| |
| // Interface for resources needed to run application. |
| class CastResource { |
| public: |
| // Resources necessary to run cast apps. CastResource may contain union of the |
| // following types. |
| // TODO(yucliu): Split video resources and graphic resources. |
| enum Resource { |
| kResourceNone = 0, |
| // All resources necessary to render sounds, for example, audio pipeline, |
| // speaker, etc. |
| kResourceAudio = 1 << 0, |
| // All resources necessary to render videos or images, for example, video |
| // pipeline, primary graphics plane, display, etc. |
| kResourceScreenPrimary = 1 << 1, |
| // All resources necessary to render overlaid images, for example, secondary |
| // graphics plane, LCD, etc. |
| kResourceScreenSecondary = 1 << 2, |
| // Collection of resources used for display only combined with bitwise or. |
| kResourceDisplayOnly = (kResourceScreenPrimary | kResourceScreenSecondary), |
| // Collection of all resources combined with bitwise or. |
| kResourceAll = |
| (kResourceAudio | kResourceScreenPrimary | kResourceScreenSecondary), |
| }; |
| |
| class Client { |
| public: |
| // Called when resource is created. CastResource should not be owned by |
| // Client. It can be called from any thread. |
| virtual void OnResourceAcquired(CastResource* cast_resource) = 0; |
| // Called when part or all resources are released. It can be called from any |
| // thread. |
| // |cast_resource| the CastResource that is released. The pointer may be |
| // invalid. Client can't call functions with that pointer. |
| // |remain| the unreleased resource of CastResource. If kResourceNone is |
| // returned, Client will remove the resource from its watching |
| // list. |
| virtual void OnResourceReleased(CastResource* cast_resource, |
| Resource remain) = 0; |
| |
| protected: |
| virtual ~Client() {} |
| }; |
| |
| void SetCastResourceClient(Client* client); |
| // Called to release resources. Implementation should call |
| // Client::OnResourceReleased when resource is released on its side. |
| virtual void ReleaseResource(Resource resource) = 0; |
| |
| protected: |
| CastResource() : client_(nullptr) {} |
| virtual ~CastResource() {} |
| |
| void NotifyResourceAcquired(); |
| void NotifyResourceReleased(Resource remain); |
| |
| private: |
| Client* client_; |
| |
| DISALLOW_COPY_AND_ASSIGN(CastResource); |
| }; |
| |
| } // namespace chromecast |
| |
| #endif |