mirror of
https://github.com/hyprwm/wlroots-hyprland.git
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4ad6e6c298
This makes it easy for compositors to handle situations where the DRM or libinput backend becomes unavailable. Compositors can listen the destroy event of the multi backend returned by wlr_backend_autocreate() and decide what to do.
65 lines
2 KiB
C
65 lines
2 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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struct wlr_session;
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struct wlr_backend_impl;
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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_display *display,
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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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#endif
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