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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 module mus.mojom; | |
6 | |
7 // A surface ID is composed of three parts: a namespace, a local ID, and a | |
8 // nonce. The local part and nonce are allocated by the client using any scheme | |
9 // that avoids duplicates and makes IDs unguessable respectively. The namespace | |
10 // is allocated by the service and will be different for each client. | |
11 // | |
12 // The special id_namespace value 0 is equivalent to the namespace of the | |
13 // client. This can be used to create, destroy and submit frames to | |
14 // surfaces before learning the namespace and to reference other surfaces | |
15 // owned by the same client. The actual id namespace must be used to pass | |
16 // surface ids to other clients for them to reference. | |
17 struct SurfaceId { | |
18 // A service allocated ID identifying a client. | |
19 uint32 id_namespace; | |
20 | |
21 // An identifier allocated by the client uniquely identifying a surface within | |
22 // a client process. | |
23 uint32 local_id; | |
24 | |
25 // A cryptographically secure random int chosen to make the SurfaceId | |
26 // unguessable by other clients. | |
27 uint64 nonce; | |
28 }; | |
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