94 lines
3.0 KiB
C
94 lines
3.0 KiB
C
/*
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* This an unstable interface of wlroots. No guarantees are made regarding the
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* future consistency of this API.
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*/
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#ifndef WLR_USE_UNSTABLE
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#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
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#endif
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#ifndef WLR_BACKEND_H
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#define WLR_BACKEND_H
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#include <wayland-server-core.h>
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#include <wlr/types/wlr_output.h>
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struct wlr_session;
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struct wlr_backend_impl;
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/**
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* Per-output state for wlr_backend_test() and wlr_backend_commit().
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*/
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struct wlr_backend_output_state {
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struct wlr_output *output;
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struct wlr_output_state base;
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};
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/**
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* A backend provides a set of input and output devices.
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*/
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struct wlr_backend {
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const struct wlr_backend_impl *impl;
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struct {
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/** Raised when destroyed */
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struct wl_signal destroy;
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/** Raised when new inputs are added, passed the struct wlr_input_device */
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struct wl_signal new_input;
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/** Raised when new outputs are added, passed the struct wlr_output */
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struct wl_signal new_output;
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} events;
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};
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/**
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* Automatically initializes the most suitable backend given the environment.
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* Will always return a multi-backend. The backend is created but not started.
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* Returns NULL on failure.
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*
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* If session_ptr is not NULL, it's populated with the session which has been
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* created with the backend, if any.
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*
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* The multi-backend will be destroyed if one of the primary underlying
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* backends is destroyed (e.g. if the primary DRM device is unplugged).
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*/
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struct wlr_backend *wlr_backend_autocreate(struct wl_event_loop *loop,
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struct wlr_session **session_ptr);
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/**
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* Start the backend. This may signal new_input or new_output immediately, but
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* may also wait until the display's event loop begins. Returns false on
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* failure.
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*/
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bool wlr_backend_start(struct wlr_backend *backend);
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/**
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* Destroy the backend and clean up all of its resources. Normally called
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* automatically when the struct wl_display is destroyed.
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*/
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void wlr_backend_destroy(struct wlr_backend *backend);
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/**
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* Returns the DRM node file descriptor used by the backend's underlying
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* platform. Can be used by consumers for additional rendering operations.
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* The consumer must not close the file descriptor since the backend continues
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* to have ownership of it.
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*/
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int wlr_backend_get_drm_fd(struct wlr_backend *backend);
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/**
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* Atomically test a new configuration for multiple outputs.
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*
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* Some backends (e.g. DRM) have global backend-wide limitations. This function
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* can be used to check whether changes across multiple outputs are supported by
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* the backend.
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*/
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bool wlr_backend_test(struct wlr_backend *backend,
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const struct wlr_backend_output_state *states, size_t states_len);
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/**
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* Atomically apply a new configuration for multiple outputs.
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*
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* There is no guarantee that the changes will be applied atomically. Users
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* should call wlr_backend_test() first to check that the new state is supported
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* by the backend.
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*/
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bool wlr_backend_commit(struct wlr_backend *backend,
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const struct wlr_backend_output_state *states, size_t states_len);
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#endif
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