| // 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. |
| |
| #ifndef ASH_ACCELERATORS_ACCELERATOR_IDS_H_ |
| #define ASH_ACCELERATORS_ACCELERATOR_IDS_H_ |
| |
| namespace ash { |
| |
| // Accelerator ids consist of two parts: |
| // . Upper 16 bits identifies source (namespace part). |
| // . Lower 16 supplied from client (local part). |
| constexpr uint16_t kLocalIdMask = 0xFFFF; |
| |
| inline uint32_t ComputeAcceleratorId(uint16_t accelerator_namespace, |
| uint16_t local_id) { |
| return (accelerator_namespace << 16) | local_id; |
| } |
| |
| inline uint16_t GetAcceleratorLocalId(uint32_t accelerator_id) { |
| return static_cast<uint16_t>(accelerator_id & kLocalIdMask); |
| } |
| |
| inline uint16_t GetAcceleratorNamespaceId(uint32_t accelerator_id) { |
| return static_cast<uint16_t>((accelerator_id >> 16) & kLocalIdMask); |
| } |
| |
| } // namespace ash |
| |
| #endif // ASH_ACCELERATORS_ACCELERATOR_IDS_H_ |