| // Copyright 2018 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 COMPONENTS_VIZ_SERVICE_DISPLAY_EMBEDDER_OUTPUT_DEVICE_BACKING_H_ |
| #define COMPONENTS_VIZ_SERVICE_DISPLAY_EMBEDDER_OUTPUT_DEVICE_BACKING_H_ |
| |
| #include <memory> |
| #include <vector> |
| |
| #include "base/macros.h" |
| #include "components/viz/service/viz_service_export.h" |
| #include "ui/gfx/geometry/size.h" |
| |
| namespace base { |
| class SharedMemory; |
| } |
| |
| namespace viz { |
| |
| // Allocates and owns a SharedMemory backing for multiple SoftwareOutputDevices. |
| // The backing will be big enough to hold the largest size returned by a |
| // client's GetViewportPixelSize(). |
| class VIZ_SERVICE_EXPORT OutputDeviceBacking { |
| public: |
| class Client { |
| public: |
| virtual const gfx::Size& GetViewportPixelSize() const = 0; |
| virtual void ReleaseCanvas() = 0; |
| |
| protected: |
| virtual ~Client() = default; |
| }; |
| |
| OutputDeviceBacking(); |
| ~OutputDeviceBacking(); |
| |
| void RegisterClient(Client* client); |
| void UnregisterClient(Client* client); |
| |
| // Called when a client has resized. Clients should call Resize() after being |
| // registered when they have a valid size. Will potential invalidate |
| // SharedMemory and call ReleaseCanvas() on clients. |
| void ClientResized(); |
| |
| // Requests a SharedMemory segment large enough to fit |viewport_size|. Will |
| // return null if |viewport_size| is too large to safely allocate SharedMemory |
| // for. |
| base::SharedMemory* GetSharedMemory(const gfx::Size& viewport_size); |
| |
| // Returns the maximum size in bytes needed for the largest viewport from |
| // registered clients. |
| size_t GetMaxViewportBytes(); |
| |
| private: |
| std::vector<Client*> clients_; |
| std::unique_ptr<base::SharedMemory> shm_; |
| size_t created_shm_bytes_ = 0; |
| |
| DISALLOW_COPY_AND_ASSIGN(OutputDeviceBacking); |
| }; |
| |
| } // namespace viz |
| |
| #endif // COMPONENTS_VIZ_SERVICE_DISPLAY_EMBEDDER_OUTPUT_DEVICE_BACKING_H_ |