| // Copyright 2016 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. |
| |
| #include "device/gamepad/gamepad_shared_buffer.h" |
| |
| namespace device { |
| |
| GamepadSharedBuffer::GamepadSharedBuffer() { |
| base::MappedReadOnlyRegion mapped_region = |
| base::ReadOnlySharedMemoryRegion::Create(sizeof(GamepadHardwareBuffer)); |
| CHECK(mapped_region.IsValid()); |
| shared_memory_region_ = std::move(mapped_region.region); |
| shared_memory_mapping_ = std::move(mapped_region.mapping); |
| |
| void* mem = shared_memory_mapping_.memory(); |
| DCHECK(mem); |
| hardware_buffer_ = new (mem) GamepadHardwareBuffer(); |
| memset(&(hardware_buffer_->data), 0, sizeof(Gamepads)); |
| } |
| |
| GamepadSharedBuffer::~GamepadSharedBuffer() = default; |
| |
| base::ReadOnlySharedMemoryRegion |
| GamepadSharedBuffer::DuplicateSharedMemoryRegion() { |
| return shared_memory_region_.Duplicate(); |
| } |
| |
| Gamepads* GamepadSharedBuffer::buffer() { |
| return &(hardware_buffer()->data); |
| } |
| |
| GamepadHardwareBuffer* GamepadSharedBuffer::hardware_buffer() { |
| return hardware_buffer_; |
| } |
| |
| void GamepadSharedBuffer::WriteBegin() { |
| hardware_buffer_->seqlock.WriteBegin(); |
| } |
| |
| void GamepadSharedBuffer::WriteEnd() { |
| hardware_buffer_->seqlock.WriteEnd(); |
| } |
| |
| } // namespace device |