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1 // Copyright 2016 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 #ifndef MOJO_PUBLIC_PLATFORM_NATIVE_MGL_ECHO_THUNKS_H_ | |
6 #define MOJO_PUBLIC_PLATFORM_NATIVE_MGL_ECHO_THUNKS_H_ | |
7 | |
8 #include <MGL/mgl_echo.h> | |
9 #include <stddef.h> | |
10 | |
11 // Structure used to bind the MGL echo interface DSO to those of the embedder. | |
12 // | |
13 // This is the ABI between the embedder and the DSO. It can only have new | |
14 // functions added to the end. No other changes are supported. | |
15 #pragma pack(push, 8) | |
16 struct MGLEchoThunks { | |
17 size_t size; // Should be set to sizeof(MGLEchoThunks). | |
18 | |
19 void (*MGLEcho)(MGLEchoCallback callback, void* lost_callback_closure); | |
20 }; | |
21 #pragma pack(pop) | |
22 | |
23 #ifdef __cplusplus | |
24 // Intended to be called from the embedder. Returns an object initialized to | |
25 // contain pointers to each of the embedder's MGLEchoThunks | |
26 // functions. | |
27 inline struct MGLEchoThunks MojoMakeMGLEchoThunks() { | |
28 struct MGLEchoThunks mgl_thunks = { | |
29 sizeof(struct MGLEchoThunks), MGLEcho, | |
30 }; | |
31 | |
32 return mgl_thunks; | |
33 } | |
34 #endif // __cplusplus | |
35 | |
36 // Use this type for the function found by dynamically discovering it in | |
37 // a DSO linked with mojo_system. For example: | |
38 // MojoSetMGLEchoThunksFn mojo_set_gles2_thunks_fn = | |
39 // reinterpret_cast<MojoSetMGLEchoThunksFn>( | |
40 // app_library.GetFunctionPointer("MojoSetMGLEchoThunks")); | |
41 // The expected size of |mgl_thunks| is returned. | |
42 // The contents of |mgl_thunks| are copied. | |
43 typedef size_t (*MojoSetMGLEchoThunksFn)( | |
44 const struct MGLEchoThunks* mgl_echo_thunks); | |
45 | |
46 #endif // MOJO_PUBLIC_PLATFORM_NATIVE_MGL_ECHO_THUNKS_H_ | |
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