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https://gitlab.freedesktop.org/wlroots/wlroots.git
synced 2025-10-29 05:40:12 -04:00
41b7acbab7
Up until now, wlr_backend_autocreate() created the wlr_session and then stuffed it into struct wlr_multi_backend so that compositors can grab it later. This is an abuse of wlr_multi_backend and the wlr_backend API: wlr_backend_get_session() and wlr_multi_backend.session only exist to accomodate the needs of wlr_backend_autocreate(). What's more, the DRM and libinput backends don't implement wlr_backend_impl.get_session. Instead, return the struct wlr_session to the compositor in the wlr_backend_autocreate() call. wlr_backend_get_session() will be removed in the next commit.
71 lines
2.3 KiB
C
71 lines
2.3 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/backend/session.h>
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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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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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* Obtains the struct wlr_session reference from this backend if there is any.
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* Might return NULL for backends that don't use a session.
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*/
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struct wlr_session *wlr_backend_get_session(struct wlr_backend *backend);
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/**
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* Returns the clock used by the backend for presentation feedback.
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*/
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clockid_t wlr_backend_get_presentation_clock(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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