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backend: embed backend_operations table in backend_base

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The idea is to allow backend plugins to override backend functions by
modifying this table. Right now, when they do this they are actually
changing a global variable and their change will persist after backend
resets (!). Store the table inside backend_base solves this problem.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui 2024-05-24 05:26:28 +01:00
parent 9c4f62cd24
commit bd26302f07
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13 changed files with 124 additions and 130 deletions
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20
include/picom/backend.h
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@ -36,15 +36,7 @@ struct managed_win;
struct ev_loop;
struct backend_operations;
typedef struct backend_base {
struct backend_operations *ops;
struct x_connection *c;
struct ev_loop *loop;
/// Whether the backend can accept new render request at the moment
bool busy;
// ...
} backend_t;
typedef struct backend_base backend_t;
// This mimics OpenGL's ARB_robustness extension, which enables detection of GPU context
// resets.
@ -475,6 +467,16 @@ struct backend_operations {
enum device_status (*device_status)(backend_t *backend_data);
};
struct backend_base {
struct backend_operations ops;
struct x_connection *c;
struct ev_loop *loop;
/// Whether the backend can accept new render request at the moment
bool busy;
// ...
};
/// Register a new backend, `major` and `minor` should be the version of the picom backend
/// interface. You should just pass `PICOM_BACKEND_MAJOR` and `PICOM_BACKEND_MINOR` here.
/// `name` is the name of the backend, `init` is the function to initialize the backend,