1008 lines
38 KiB
C
1008 lines
38 KiB
C
#define _POSIX_C_SOURCE 200112L
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#include <assert.h>
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#include <getopt.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <time.h>
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#include <unistd.h>
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#include <wayland-server-core.h>
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#include <wlr/backend.h>
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#include <wlr/render/allocator.h>
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#include <wlr/render/wlr_renderer.h>
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#include <wlr/types/wlr_cursor.h>
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#include <wlr/types/wlr_compositor.h>
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#include <wlr/types/wlr_data_device.h>
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#include <wlr/types/wlr_input_device.h>
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#include <wlr/types/wlr_keyboard.h>
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#include <wlr/types/wlr_output.h>
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#include <wlr/types/wlr_output_layout.h>
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#include <wlr/types/wlr_pointer.h>
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#include <wlr/types/wlr_scene.h>
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#include <wlr/types/wlr_seat.h>
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#include <wlr/types/wlr_subcompositor.h>
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#include <wlr/types/wlr_xcursor_manager.h>
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#include <wlr/types/wlr_xdg_shell.h>
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#include <wlr/util/log.h>
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#include <xkbcommon/xkbcommon.h>
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/* For brevity's sake, struct members are annotated where they are used. */
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enum tinywl_cursor_mode {
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TINYWL_CURSOR_PASSTHROUGH,
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TINYWL_CURSOR_MOVE,
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TINYWL_CURSOR_RESIZE,
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};
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struct tinywl_server {
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struct wl_display *wl_display;
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struct wlr_backend *backend;
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struct wlr_renderer *renderer;
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struct wlr_allocator *allocator;
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struct wlr_scene *scene;
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struct wlr_xdg_shell *xdg_shell;
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struct wl_listener new_xdg_surface;
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struct wl_list views;
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struct wlr_cursor *cursor;
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struct wlr_xcursor_manager *cursor_mgr;
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struct wl_listener cursor_motion;
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struct wl_listener cursor_motion_absolute;
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struct wl_listener cursor_button;
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struct wl_listener cursor_axis;
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struct wl_listener cursor_frame;
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struct wlr_seat *seat;
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struct wl_listener new_input;
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struct wl_listener request_cursor;
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struct wl_listener request_set_selection;
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struct wl_list keyboards;
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enum tinywl_cursor_mode cursor_mode;
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struct tinywl_view *grabbed_view;
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double grab_x, grab_y;
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struct wlr_box grab_geobox;
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uint32_t resize_edges;
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struct wlr_output_layout *output_layout;
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struct wl_list outputs;
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struct wl_listener new_output;
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};
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struct tinywl_output {
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struct wl_list link;
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struct tinywl_server *server;
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struct wlr_output *wlr_output;
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struct wl_listener frame;
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struct wl_listener request_state;
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struct wl_listener destroy;
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};
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struct tinywl_view {
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struct wl_list link;
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struct tinywl_server *server;
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struct wlr_xdg_toplevel *xdg_toplevel;
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struct wlr_scene_tree *scene_tree;
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struct wl_listener map;
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struct wl_listener unmap;
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struct wl_listener destroy;
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struct wl_listener request_move;
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struct wl_listener request_resize;
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struct wl_listener request_maximize;
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struct wl_listener request_fullscreen;
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};
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struct tinywl_keyboard {
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struct wl_list link;
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struct tinywl_server *server;
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struct wlr_keyboard *wlr_keyboard;
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struct wl_listener modifiers;
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struct wl_listener key;
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struct wl_listener destroy;
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};
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static void focus_view(struct tinywl_view *view, struct wlr_surface *surface) {
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/* Note: this function only deals with keyboard focus. */
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if (view == NULL) {
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return;
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}
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struct tinywl_server *server = view->server;
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struct wlr_seat *seat = server->seat;
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struct wlr_surface *prev_surface = seat->keyboard_state.focused_surface;
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if (prev_surface == surface) {
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/* Don't re-focus an already focused surface. */
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return;
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}
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if (prev_surface) {
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/*
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* Deactivate the previously focused surface. This lets the client know
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* it no longer has focus and the client will repaint accordingly, e.g.
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* stop displaying a caret.
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*/
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struct wlr_xdg_surface *previous = wlr_xdg_surface_from_wlr_surface(
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seat->keyboard_state.focused_surface);
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assert(previous->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
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wlr_xdg_toplevel_set_activated(previous->toplevel, false);
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}
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struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat);
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/* Move the view to the front */
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wlr_scene_node_raise_to_top(&view->scene_tree->node);
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wl_list_remove(&view->link);
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wl_list_insert(&server->views, &view->link);
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/* Activate the new surface */
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wlr_xdg_toplevel_set_activated(view->xdg_toplevel, true);
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/*
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* Tell the seat to have the keyboard enter this surface. wlroots will keep
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* track of this and automatically send key events to the appropriate
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* clients without additional work on your part.
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*/
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if (keyboard != NULL) {
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wlr_seat_keyboard_notify_enter(seat, view->xdg_toplevel->base->surface,
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keyboard->keycodes, keyboard->num_keycodes, &keyboard->modifiers);
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}
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}
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static void keyboard_handle_modifiers(
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struct wl_listener *listener, void *data) {
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/* This event is raised when a modifier key, such as shift or alt, is
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* pressed. We simply communicate this to the client. */
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struct tinywl_keyboard *keyboard =
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wl_container_of(listener, keyboard, modifiers);
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/*
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* A seat can only have one keyboard, but this is a limitation of the
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* Wayland protocol - not wlroots. We assign all connected keyboards to the
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* same seat. You can swap out the underlying wlr_keyboard like this and
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* wlr_seat handles this transparently.
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*/
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wlr_seat_set_keyboard(keyboard->server->seat, keyboard->wlr_keyboard);
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/* Send modifiers to the client. */
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wlr_seat_keyboard_notify_modifiers(keyboard->server->seat,
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&keyboard->wlr_keyboard->modifiers);
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}
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static bool handle_keybinding(struct tinywl_server *server, xkb_keysym_t sym) {
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/*
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* Here we handle compositor keybindings. This is when the compositor is
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* processing keys, rather than passing them on to the client for its own
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* processing.
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*
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* This function assumes Alt is held down.
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*/
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switch (sym) {
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case XKB_KEY_Escape:
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wl_display_terminate(server->wl_display);
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break;
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case XKB_KEY_F1:
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/* Cycle to the next view */
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if (wl_list_length(&server->views) < 2) {
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break;
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}
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struct tinywl_view *next_view = wl_container_of(
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server->views.prev, next_view, link);
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focus_view(next_view, next_view->xdg_toplevel->base->surface);
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break;
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default:
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return false;
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}
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return true;
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}
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static void keyboard_handle_key(
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struct wl_listener *listener, void *data) {
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/* This event is raised when a key is pressed or released. */
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struct tinywl_keyboard *keyboard =
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wl_container_of(listener, keyboard, key);
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struct tinywl_server *server = keyboard->server;
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struct wlr_keyboard_key_event *event = data;
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struct wlr_seat *seat = server->seat;
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/* Translate libinput keycode -> xkbcommon */
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uint32_t keycode = event->keycode + 8;
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/* Get a list of keysyms based on the keymap for this keyboard */
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const xkb_keysym_t *syms;
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int nsyms = xkb_state_key_get_syms(
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keyboard->wlr_keyboard->xkb_state, keycode, &syms);
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bool handled = false;
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uint32_t modifiers = wlr_keyboard_get_modifiers(keyboard->wlr_keyboard);
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if ((modifiers & WLR_MODIFIER_ALT) &&
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event->state == WL_KEYBOARD_KEY_STATE_PRESSED) {
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/* If alt is held down and this button was _pressed_, we attempt to
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* process it as a compositor keybinding. */
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for (int i = 0; i < nsyms; i++) {
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handled = handle_keybinding(server, syms[i]);
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}
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}
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if (!handled) {
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/* Otherwise, we pass it along to the client. */
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wlr_seat_set_keyboard(seat, keyboard->wlr_keyboard);
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wlr_seat_keyboard_notify_key(seat, event->time_msec,
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event->keycode, event->state);
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}
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}
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static void keyboard_handle_destroy(struct wl_listener *listener, void *data) {
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/* This event is raised by the keyboard base wlr_input_device to signal
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* the destruction of the wlr_keyboard. It will no longer receive events
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* and should be destroyed.
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*/
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struct tinywl_keyboard *keyboard =
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wl_container_of(listener, keyboard, destroy);
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wl_list_remove(&keyboard->modifiers.link);
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wl_list_remove(&keyboard->key.link);
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wl_list_remove(&keyboard->destroy.link);
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wl_list_remove(&keyboard->link);
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free(keyboard);
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}
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static void server_new_keyboard(struct tinywl_server *server,
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struct wlr_input_device *device) {
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struct wlr_keyboard *wlr_keyboard = wlr_keyboard_from_input_device(device);
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struct tinywl_keyboard *keyboard =
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calloc(1, sizeof(struct tinywl_keyboard));
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keyboard->server = server;
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keyboard->wlr_keyboard = wlr_keyboard;
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/* We need to prepare an XKB keymap and assign it to the keyboard. This
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* assumes the defaults (e.g. layout = "us"). */
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struct xkb_context *context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
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struct xkb_keymap *keymap = xkb_keymap_new_from_names(context, NULL,
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XKB_KEYMAP_COMPILE_NO_FLAGS);
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wlr_keyboard_set_keymap(wlr_keyboard, keymap);
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xkb_keymap_unref(keymap);
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xkb_context_unref(context);
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wlr_keyboard_set_repeat_info(wlr_keyboard, 25, 600);
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/* Here we set up listeners for keyboard events. */
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keyboard->modifiers.notify = keyboard_handle_modifiers;
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wl_signal_add(&wlr_keyboard->events.modifiers, &keyboard->modifiers);
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keyboard->key.notify = keyboard_handle_key;
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wl_signal_add(&wlr_keyboard->events.key, &keyboard->key);
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keyboard->destroy.notify = keyboard_handle_destroy;
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wl_signal_add(&device->events.destroy, &keyboard->destroy);
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wlr_seat_set_keyboard(server->seat, keyboard->wlr_keyboard);
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/* And add the keyboard to our list of keyboards */
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wl_list_insert(&server->keyboards, &keyboard->link);
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}
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static void server_new_pointer(struct tinywl_server *server,
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struct wlr_input_device *device) {
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/* We don't do anything special with pointers. All of our pointer handling
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* is proxied through wlr_cursor. On another compositor, you might take this
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* opportunity to do libinput configuration on the device to set
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* acceleration, etc. */
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wlr_cursor_attach_input_device(server->cursor, device);
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}
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static void server_new_input(struct wl_listener *listener, void *data) {
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/* This event is raised by the backend when a new input device becomes
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* available. */
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struct tinywl_server *server =
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wl_container_of(listener, server, new_input);
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struct wlr_input_device *device = data;
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switch (device->type) {
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case WLR_INPUT_DEVICE_KEYBOARD:
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server_new_keyboard(server, device);
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break;
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case WLR_INPUT_DEVICE_POINTER:
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server_new_pointer(server, device);
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break;
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default:
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break;
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}
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/* We need to let the wlr_seat know what our capabilities are, which is
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* communiciated to the client. In TinyWL we always have a cursor, even if
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* there are no pointer devices, so we always include that capability. */
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uint32_t caps = WL_SEAT_CAPABILITY_POINTER;
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if (!wl_list_empty(&server->keyboards)) {
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caps |= WL_SEAT_CAPABILITY_KEYBOARD;
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}
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wlr_seat_set_capabilities(server->seat, caps);
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}
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static void seat_request_cursor(struct wl_listener *listener, void *data) {
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struct tinywl_server *server = wl_container_of(
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listener, server, request_cursor);
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/* This event is raised by the seat when a client provides a cursor image */
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struct wlr_seat_pointer_request_set_cursor_event *event = data;
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struct wlr_seat_client *focused_client =
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server->seat->pointer_state.focused_client;
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/* This can be sent by any client, so we check to make sure this one is
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* actually has pointer focus first. */
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if (focused_client == event->seat_client) {
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/* Once we've vetted the client, we can tell the cursor to use the
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* provided surface as the cursor image. It will set the hardware cursor
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* on the output that it's currently on and continue to do so as the
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* cursor moves between outputs. */
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wlr_cursor_set_surface(server->cursor, event->surface,
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event->hotspot_x, event->hotspot_y);
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}
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}
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static void seat_request_set_selection(struct wl_listener *listener, void *data) {
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/* This event is raised by the seat when a client wants to set the selection,
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* usually when the user copies something. wlroots allows compositors to
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* ignore such requests if they so choose, but in tinywl we always honor
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*/
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struct tinywl_server *server = wl_container_of(
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listener, server, request_set_selection);
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struct wlr_seat_request_set_selection_event *event = data;
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wlr_seat_set_selection(server->seat, event->source, event->serial);
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}
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static struct tinywl_view *desktop_view_at(
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struct tinywl_server *server, double lx, double ly,
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struct wlr_surface **surface, double *sx, double *sy) {
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/* This returns the topmost node in the scene at the given layout coords.
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* we only care about surface nodes as we are specifically looking for a
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* surface in the surface tree of a tinywl_view. */
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struct wlr_scene_node *node = wlr_scene_node_at(
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&server->scene->tree.node, lx, ly, sx, sy);
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if (node == NULL || node->type != WLR_SCENE_NODE_BUFFER) {
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return NULL;
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}
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struct wlr_scene_buffer *scene_buffer = wlr_scene_buffer_from_node(node);
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struct wlr_scene_surface *scene_surface =
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wlr_scene_surface_from_buffer(scene_buffer);
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if (!scene_surface) {
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return NULL;
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}
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*surface = scene_surface->surface;
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/* Find the node corresponding to the tinywl_view at the root of this
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* surface tree, it is the only one for which we set the data field. */
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struct wlr_scene_tree *tree = node->parent;
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while (tree != NULL && tree->node.data == NULL) {
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tree = tree->node.parent;
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}
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return tree->node.data;
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}
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static void reset_cursor_mode(struct tinywl_server *server) {
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/* Reset the cursor mode to passthrough. */
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server->cursor_mode = TINYWL_CURSOR_PASSTHROUGH;
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server->grabbed_view = NULL;
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}
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static void process_cursor_move(struct tinywl_server *server, uint32_t time) {
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/* Move the grabbed view to the new position. */
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struct tinywl_view *view = server->grabbed_view;
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wlr_scene_node_set_position(&view->scene_tree->node,
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server->cursor->x - server->grab_x,
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server->cursor->y - server->grab_y);
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}
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static void process_cursor_resize(struct tinywl_server *server, uint32_t time) {
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/*
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* Resizing the grabbed view can be a little bit complicated, because we
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* could be resizing from any corner or edge. This not only resizes the view
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* on one or two axes, but can also move the view if you resize from the top
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* or left edges (or top-left corner).
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*
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* Note that I took some shortcuts here. In a more fleshed-out compositor,
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* you'd wait for the client to prepare a buffer at the new size, then
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* commit any movement that was prepared.
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*/
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struct tinywl_view *view = server->grabbed_view;
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double border_x = server->cursor->x - server->grab_x;
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double border_y = server->cursor->y - server->grab_y;
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int new_left = server->grab_geobox.x;
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int new_right = server->grab_geobox.x + server->grab_geobox.width;
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int new_top = server->grab_geobox.y;
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int new_bottom = server->grab_geobox.y + server->grab_geobox.height;
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if (server->resize_edges & WLR_EDGE_TOP) {
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new_top = border_y;
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if (new_top >= new_bottom) {
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new_top = new_bottom - 1;
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}
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} else if (server->resize_edges & WLR_EDGE_BOTTOM) {
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new_bottom = border_y;
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if (new_bottom <= new_top) {
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new_bottom = new_top + 1;
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}
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}
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if (server->resize_edges & WLR_EDGE_LEFT) {
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new_left = border_x;
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if (new_left >= new_right) {
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new_left = new_right - 1;
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}
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} else if (server->resize_edges & WLR_EDGE_RIGHT) {
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new_right = border_x;
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if (new_right <= new_left) {
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new_right = new_left + 1;
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}
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}
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struct wlr_box geo_box;
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wlr_xdg_surface_get_geometry(view->xdg_toplevel->base, &geo_box);
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wlr_scene_node_set_position(&view->scene_tree->node,
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new_left - geo_box.x, new_top - geo_box.y);
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int new_width = new_right - new_left;
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int new_height = new_bottom - new_top;
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wlr_xdg_toplevel_set_size(view->xdg_toplevel, new_width, new_height);
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}
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static void process_cursor_motion(struct tinywl_server *server, uint32_t time) {
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/* If the mode is non-passthrough, delegate to those functions. */
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if (server->cursor_mode == TINYWL_CURSOR_MOVE) {
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process_cursor_move(server, time);
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return;
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} else if (server->cursor_mode == TINYWL_CURSOR_RESIZE) {
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process_cursor_resize(server, time);
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return;
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}
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/* Otherwise, find the view under the pointer and send the event along. */
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double sx, sy;
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struct wlr_seat *seat = server->seat;
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struct wlr_surface *surface = NULL;
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struct tinywl_view *view = desktop_view_at(server,
|
|
server->cursor->x, server->cursor->y, &surface, &sx, &sy);
|
|
if (!view) {
|
|
/* If there's no view under the cursor, set the cursor image to a
|
|
* default. This is what makes the cursor image appear when you move it
|
|
* around the screen, not over any views. */
|
|
wlr_xcursor_manager_set_cursor_image(
|
|
server->cursor_mgr, "default", server->cursor);
|
|
}
|
|
if (surface) {
|
|
/*
|
|
* Send pointer enter and motion events.
|
|
*
|
|
* The enter event gives the surface "pointer focus", which is distinct
|
|
* from keyboard focus. You get pointer focus by moving the pointer over
|
|
* a window.
|
|
*
|
|
* Note that wlroots will avoid sending duplicate enter/motion events if
|
|
* the surface has already has pointer focus or if the client is already
|
|
* aware of the coordinates passed.
|
|
*/
|
|
wlr_seat_pointer_notify_enter(seat, surface, sx, sy);
|
|
wlr_seat_pointer_notify_motion(seat, time, sx, sy);
|
|
} else {
|
|
/* Clear pointer focus so future button events and such are not sent to
|
|
* the last client to have the cursor over it. */
|
|
wlr_seat_pointer_clear_focus(seat);
|
|
}
|
|
}
|
|
|
|
static void server_cursor_motion(struct wl_listener *listener, void *data) {
|
|
/* This event is forwarded by the cursor when a pointer emits a _relative_
|
|
* pointer motion event (i.e. a delta) */
|
|
struct tinywl_server *server =
|
|
wl_container_of(listener, server, cursor_motion);
|
|
struct wlr_pointer_motion_event *event = data;
|
|
/* The cursor doesn't move unless we tell it to. The cursor automatically
|
|
* handles constraining the motion to the output layout, as well as any
|
|
* special configuration applied for the specific input device which
|
|
* generated the event. You can pass NULL for the device if you want to move
|
|
* the cursor around without any input. */
|
|
wlr_cursor_move(server->cursor, &event->pointer->base,
|
|
event->delta_x, event->delta_y);
|
|
process_cursor_motion(server, event->time_msec);
|
|
}
|
|
|
|
static void server_cursor_motion_absolute(
|
|
struct wl_listener *listener, void *data) {
|
|
/* This event is forwarded by the cursor when a pointer emits an _absolute_
|
|
* motion event, from 0..1 on each axis. This happens, for example, when
|
|
* wlroots is running under a Wayland window rather than KMS+DRM, and you
|
|
* move the mouse over the window. You could enter the window from any edge,
|
|
* so we have to warp the mouse there. There is also some hardware which
|
|
* emits these events. */
|
|
struct tinywl_server *server =
|
|
wl_container_of(listener, server, cursor_motion_absolute);
|
|
struct wlr_pointer_motion_absolute_event *event = data;
|
|
wlr_cursor_warp_absolute(server->cursor, &event->pointer->base, event->x,
|
|
event->y);
|
|
process_cursor_motion(server, event->time_msec);
|
|
}
|
|
|
|
static void server_cursor_button(struct wl_listener *listener, void *data) {
|
|
/* This event is forwarded by the cursor when a pointer emits a button
|
|
* event. */
|
|
struct tinywl_server *server =
|
|
wl_container_of(listener, server, cursor_button);
|
|
struct wlr_pointer_button_event *event = data;
|
|
/* Notify the client with pointer focus that a button press has occurred */
|
|
wlr_seat_pointer_notify_button(server->seat,
|
|
event->time_msec, event->button, event->state);
|
|
double sx, sy;
|
|
struct wlr_surface *surface = NULL;
|
|
struct tinywl_view *view = desktop_view_at(server,
|
|
server->cursor->x, server->cursor->y, &surface, &sx, &sy);
|
|
if (event->state == WLR_BUTTON_RELEASED) {
|
|
/* If you released any buttons, we exit interactive move/resize mode. */
|
|
reset_cursor_mode(server);
|
|
} else {
|
|
/* Focus that client if the button was _pressed_ */
|
|
focus_view(view, surface);
|
|
}
|
|
}
|
|
|
|
static void server_cursor_axis(struct wl_listener *listener, void *data) {
|
|
/* This event is forwarded by the cursor when a pointer emits an axis event,
|
|
* for example when you move the scroll wheel. */
|
|
struct tinywl_server *server =
|
|
wl_container_of(listener, server, cursor_axis);
|
|
struct wlr_pointer_axis_event *event = data;
|
|
/* Notify the client with pointer focus of the axis event. */
|
|
wlr_seat_pointer_notify_axis(server->seat,
|
|
event->time_msec, event->orientation, event->delta,
|
|
event->delta_discrete, event->source);
|
|
}
|
|
|
|
static void server_cursor_frame(struct wl_listener *listener, void *data) {
|
|
/* This event is forwarded by the cursor when a pointer emits an frame
|
|
* event. Frame events are sent after regular pointer events to group
|
|
* multiple events together. For instance, two axis events may happen at the
|
|
* same time, in which case a frame event won't be sent in between. */
|
|
struct tinywl_server *server =
|
|
wl_container_of(listener, server, cursor_frame);
|
|
/* Notify the client with pointer focus of the frame event. */
|
|
wlr_seat_pointer_notify_frame(server->seat);
|
|
}
|
|
|
|
static void output_frame(struct wl_listener *listener, void *data) {
|
|
/* This function is called every time an output is ready to display a frame,
|
|
* generally at the output's refresh rate (e.g. 60Hz). */
|
|
struct tinywl_output *output = wl_container_of(listener, output, frame);
|
|
struct wlr_scene *scene = output->server->scene;
|
|
|
|
struct wlr_scene_output *scene_output = wlr_scene_get_scene_output(
|
|
scene, output->wlr_output);
|
|
|
|
/* Render the scene if needed and commit the output */
|
|
wlr_scene_output_commit(scene_output);
|
|
|
|
struct timespec now;
|
|
clock_gettime(CLOCK_MONOTONIC, &now);
|
|
wlr_scene_output_send_frame_done(scene_output, &now);
|
|
}
|
|
|
|
static void output_request_state(struct wl_listener *listener, void *data) {
|
|
/* This function is called when the backend requests a new state for
|
|
* the output. For example, Wayland and X11 backends request a new mode
|
|
* when the output window is resized. */
|
|
struct tinywl_output *output = wl_container_of(listener, output, request_state);
|
|
const struct wlr_output_event_request_state *event = data;
|
|
wlr_output_commit_state(output->wlr_output, event->state);
|
|
}
|
|
|
|
static void output_destroy(struct wl_listener *listener, void *data) {
|
|
struct tinywl_output *output = wl_container_of(listener, output, destroy);
|
|
|
|
wl_list_remove(&output->frame.link);
|
|
wl_list_remove(&output->request_state.link);
|
|
wl_list_remove(&output->destroy.link);
|
|
wl_list_remove(&output->link);
|
|
free(output);
|
|
}
|
|
|
|
static void server_new_output(struct wl_listener *listener, void *data) {
|
|
/* This event is raised by the backend when a new output (aka a display or
|
|
* monitor) becomes available. */
|
|
struct tinywl_server *server =
|
|
wl_container_of(listener, server, new_output);
|
|
struct wlr_output *wlr_output = data;
|
|
|
|
/* Configures the output created by the backend to use our allocator
|
|
* and our renderer. Must be done once, before commiting the output */
|
|
wlr_output_init_render(wlr_output, server->allocator, server->renderer);
|
|
|
|
/* Some backends don't have modes. DRM+KMS does, and we need to set a mode
|
|
* before we can use the output. The mode is a tuple of (width, height,
|
|
* refresh rate), and each monitor supports only a specific set of modes. We
|
|
* just pick the monitor's preferred mode, a more sophisticated compositor
|
|
* would let the user configure it. */
|
|
if (!wl_list_empty(&wlr_output->modes)) {
|
|
struct wlr_output_mode *mode = wlr_output_preferred_mode(wlr_output);
|
|
wlr_output_set_mode(wlr_output, mode);
|
|
wlr_output_enable(wlr_output, true);
|
|
if (!wlr_output_commit(wlr_output)) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Allocates and configures our state for this output */
|
|
struct tinywl_output *output =
|
|
calloc(1, sizeof(struct tinywl_output));
|
|
output->wlr_output = wlr_output;
|
|
output->server = server;
|
|
|
|
/* Sets up a listener for the frame event. */
|
|
output->frame.notify = output_frame;
|
|
wl_signal_add(&wlr_output->events.frame, &output->frame);
|
|
|
|
/* Sets up a listener for the state request event. */
|
|
output->request_state.notify = output_request_state;
|
|
wl_signal_add(&wlr_output->events.request_state, &output->request_state);
|
|
|
|
/* Sets up a listener for the destroy event. */
|
|
output->destroy.notify = output_destroy;
|
|
wl_signal_add(&wlr_output->events.destroy, &output->destroy);
|
|
|
|
wl_list_insert(&server->outputs, &output->link);
|
|
|
|
/* Adds this to the output layout. The add_auto function arranges outputs
|
|
* from left-to-right in the order they appear. A more sophisticated
|
|
* compositor would let the user configure the arrangement of outputs in the
|
|
* layout.
|
|
*
|
|
* The output layout utility automatically adds a wl_output global to the
|
|
* display, which Wayland clients can see to find out information about the
|
|
* output (such as DPI, scale factor, manufacturer, etc).
|
|
*/
|
|
wlr_output_layout_add_auto(server->output_layout, wlr_output);
|
|
}
|
|
|
|
static void xdg_toplevel_map(struct wl_listener *listener, void *data) {
|
|
/* Called when the surface is mapped, or ready to display on-screen. */
|
|
struct tinywl_view *view = wl_container_of(listener, view, map);
|
|
|
|
wl_list_insert(&view->server->views, &view->link);
|
|
|
|
focus_view(view, view->xdg_toplevel->base->surface);
|
|
}
|
|
|
|
static void xdg_toplevel_unmap(struct wl_listener *listener, void *data) {
|
|
/* Called when the surface is unmapped, and should no longer be shown. */
|
|
struct tinywl_view *view = wl_container_of(listener, view, unmap);
|
|
|
|
/* Reset the cursor mode if the grabbed view was unmapped. */
|
|
if (view == view->server->grabbed_view) {
|
|
reset_cursor_mode(view->server);
|
|
}
|
|
|
|
wl_list_remove(&view->link);
|
|
}
|
|
|
|
static void xdg_toplevel_destroy(struct wl_listener *listener, void *data) {
|
|
/* Called when the surface is destroyed and should never be shown again. */
|
|
struct tinywl_view *view = wl_container_of(listener, view, destroy);
|
|
|
|
wl_list_remove(&view->map.link);
|
|
wl_list_remove(&view->unmap.link);
|
|
wl_list_remove(&view->destroy.link);
|
|
wl_list_remove(&view->request_move.link);
|
|
wl_list_remove(&view->request_resize.link);
|
|
wl_list_remove(&view->request_maximize.link);
|
|
wl_list_remove(&view->request_fullscreen.link);
|
|
|
|
free(view);
|
|
}
|
|
|
|
static void begin_interactive(struct tinywl_view *view,
|
|
enum tinywl_cursor_mode mode, uint32_t edges) {
|
|
/* This function sets up an interactive move or resize operation, where the
|
|
* compositor stops propegating pointer events to clients and instead
|
|
* consumes them itself, to move or resize windows. */
|
|
struct tinywl_server *server = view->server;
|
|
struct wlr_surface *focused_surface =
|
|
server->seat->pointer_state.focused_surface;
|
|
if (view->xdg_toplevel->base->surface !=
|
|
wlr_surface_get_root_surface(focused_surface)) {
|
|
/* Deny move/resize requests from unfocused clients. */
|
|
return;
|
|
}
|
|
server->grabbed_view = view;
|
|
server->cursor_mode = mode;
|
|
|
|
if (mode == TINYWL_CURSOR_MOVE) {
|
|
server->grab_x = server->cursor->x - view->scene_tree->node.x;
|
|
server->grab_y = server->cursor->y - view->scene_tree->node.y;
|
|
} else {
|
|
struct wlr_box geo_box;
|
|
wlr_xdg_surface_get_geometry(view->xdg_toplevel->base, &geo_box);
|
|
|
|
double border_x = (view->scene_tree->node.x + geo_box.x) +
|
|
((edges & WLR_EDGE_RIGHT) ? geo_box.width : 0);
|
|
double border_y = (view->scene_tree->node.y + geo_box.y) +
|
|
((edges & WLR_EDGE_BOTTOM) ? geo_box.height : 0);
|
|
server->grab_x = server->cursor->x - border_x;
|
|
server->grab_y = server->cursor->y - border_y;
|
|
|
|
server->grab_geobox = geo_box;
|
|
server->grab_geobox.x += view->scene_tree->node.x;
|
|
server->grab_geobox.y += view->scene_tree->node.y;
|
|
|
|
server->resize_edges = edges;
|
|
}
|
|
}
|
|
|
|
static void xdg_toplevel_request_move(
|
|
struct wl_listener *listener, void *data) {
|
|
/* This event is raised when a client would like to begin an interactive
|
|
* move, typically because the user clicked on their client-side
|
|
* decorations. Note that a more sophisticated compositor should check the
|
|
* provided serial against a list of button press serials sent to this
|
|
* client, to prevent the client from requesting this whenever they want. */
|
|
struct tinywl_view *view = wl_container_of(listener, view, request_move);
|
|
begin_interactive(view, TINYWL_CURSOR_MOVE, 0);
|
|
}
|
|
|
|
static void xdg_toplevel_request_resize(
|
|
struct wl_listener *listener, void *data) {
|
|
/* This event is raised when a client would like to begin an interactive
|
|
* resize, typically because the user clicked on their client-side
|
|
* decorations. Note that a more sophisticated compositor should check the
|
|
* provided serial against a list of button press serials sent to this
|
|
* client, to prevent the client from requesting this whenever they want. */
|
|
struct wlr_xdg_toplevel_resize_event *event = data;
|
|
struct tinywl_view *view = wl_container_of(listener, view, request_resize);
|
|
begin_interactive(view, TINYWL_CURSOR_RESIZE, event->edges);
|
|
}
|
|
|
|
static void xdg_toplevel_request_maximize(
|
|
struct wl_listener *listener, void *data) {
|
|
/* This event is raised when a client would like to maximize itself,
|
|
* typically because the user clicked on the maximize button on
|
|
* client-side decorations. tinywl doesn't support maximization, but
|
|
* to conform to xdg-shell protocol we still must send a configure.
|
|
* wlr_xdg_surface_schedule_configure() is used to send an empty reply. */
|
|
struct tinywl_view *view =
|
|
wl_container_of(listener, view, request_maximize);
|
|
wlr_xdg_surface_schedule_configure(view->xdg_toplevel->base);
|
|
}
|
|
|
|
static void xdg_toplevel_request_fullscreen(
|
|
struct wl_listener *listener, void *data) {
|
|
/* Just as with request_maximize, we must send a configure here. */
|
|
struct tinywl_view *view =
|
|
wl_container_of(listener, view, request_fullscreen);
|
|
wlr_xdg_surface_schedule_configure(view->xdg_toplevel->base);
|
|
}
|
|
|
|
static void server_new_xdg_surface(struct wl_listener *listener, void *data) {
|
|
/* This event is raised when wlr_xdg_shell receives a new xdg surface from a
|
|
* client, either a toplevel (application window) or popup. */
|
|
struct tinywl_server *server =
|
|
wl_container_of(listener, server, new_xdg_surface);
|
|
struct wlr_xdg_surface *xdg_surface = data;
|
|
|
|
/* We must add xdg popups to the scene graph so they get rendered. The
|
|
* wlroots scene graph provides a helper for this, but to use it we must
|
|
* provide the proper parent scene node of the xdg popup. To enable this,
|
|
* we always set the user data field of xdg_surfaces to the corresponding
|
|
* scene node. */
|
|
if (xdg_surface->role == WLR_XDG_SURFACE_ROLE_POPUP) {
|
|
struct wlr_xdg_surface *parent = wlr_xdg_surface_from_wlr_surface(
|
|
xdg_surface->popup->parent);
|
|
struct wlr_scene_tree *parent_tree = parent->data;
|
|
xdg_surface->data = wlr_scene_xdg_surface_create(
|
|
parent_tree, xdg_surface);
|
|
return;
|
|
}
|
|
assert(xdg_surface->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
|
|
|
|
/* Allocate a tinywl_view for this surface */
|
|
struct tinywl_view *view =
|
|
calloc(1, sizeof(struct tinywl_view));
|
|
view->server = server;
|
|
view->xdg_toplevel = xdg_surface->toplevel;
|
|
view->scene_tree = wlr_scene_xdg_surface_create(
|
|
&view->server->scene->tree, view->xdg_toplevel->base);
|
|
view->scene_tree->node.data = view;
|
|
xdg_surface->data = view->scene_tree;
|
|
|
|
/* Listen to the various events it can emit */
|
|
view->map.notify = xdg_toplevel_map;
|
|
wl_signal_add(&xdg_surface->events.map, &view->map);
|
|
view->unmap.notify = xdg_toplevel_unmap;
|
|
wl_signal_add(&xdg_surface->events.unmap, &view->unmap);
|
|
view->destroy.notify = xdg_toplevel_destroy;
|
|
wl_signal_add(&xdg_surface->events.destroy, &view->destroy);
|
|
|
|
/* cotd */
|
|
struct wlr_xdg_toplevel *toplevel = xdg_surface->toplevel;
|
|
view->request_move.notify = xdg_toplevel_request_move;
|
|
wl_signal_add(&toplevel->events.request_move, &view->request_move);
|
|
view->request_resize.notify = xdg_toplevel_request_resize;
|
|
wl_signal_add(&toplevel->events.request_resize, &view->request_resize);
|
|
view->request_maximize.notify = xdg_toplevel_request_maximize;
|
|
wl_signal_add(&toplevel->events.request_maximize,
|
|
&view->request_maximize);
|
|
view->request_fullscreen.notify = xdg_toplevel_request_fullscreen;
|
|
wl_signal_add(&toplevel->events.request_fullscreen,
|
|
&view->request_fullscreen);
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
wlr_log_init(WLR_DEBUG, NULL);
|
|
char *startup_cmd = NULL;
|
|
|
|
int c;
|
|
while ((c = getopt(argc, argv, "s:h")) != -1) {
|
|
switch (c) {
|
|
case 's':
|
|
startup_cmd = optarg;
|
|
break;
|
|
default:
|
|
printf("Usage: %s [-s startup command]\n", argv[0]);
|
|
return 0;
|
|
}
|
|
}
|
|
if (optind < argc) {
|
|
printf("Usage: %s [-s startup command]\n", argv[0]);
|
|
return 0;
|
|
}
|
|
|
|
struct tinywl_server server;
|
|
/* The Wayland display is managed by libwayland. It handles accepting
|
|
* clients from the Unix socket, manging Wayland globals, and so on. */
|
|
server.wl_display = wl_display_create();
|
|
/* The backend is a wlroots feature which abstracts the underlying input and
|
|
* output hardware. The autocreate option will choose the most suitable
|
|
* backend based on the current environment, such as opening an X11 window
|
|
* if an X11 server is running. */
|
|
server.backend = wlr_backend_autocreate(server.wl_display, NULL);
|
|
if (server.backend == NULL) {
|
|
wlr_log(WLR_ERROR, "failed to create wlr_backend");
|
|
return 1;
|
|
}
|
|
|
|
/* Autocreates a renderer, either Pixman, GLES2 or Vulkan for us. The user
|
|
* can also specify a renderer using the WLR_RENDERER env var.
|
|
* The renderer is responsible for defining the various pixel formats it
|
|
* supports for shared memory, this configures that for clients. */
|
|
server.renderer = wlr_renderer_autocreate(server.backend);
|
|
if (server.renderer == NULL) {
|
|
wlr_log(WLR_ERROR, "failed to create wlr_renderer");
|
|
return 1;
|
|
}
|
|
|
|
wlr_renderer_init_wl_display(server.renderer, server.wl_display);
|
|
|
|
/* Autocreates an allocator for us.
|
|
* The allocator is the bridge between the renderer and the backend. It
|
|
* handles the buffer creation, allowing wlroots to render onto the
|
|
* screen */
|
|
server.allocator = wlr_allocator_autocreate(server.backend,
|
|
server.renderer);
|
|
if (server.allocator == NULL) {
|
|
wlr_log(WLR_ERROR, "failed to create wlr_allocator");
|
|
return 1;
|
|
}
|
|
|
|
/* This creates some hands-off wlroots interfaces. The compositor is
|
|
* necessary for clients to allocate surfaces, the subcompositor allows to
|
|
* assign the role of subsurfaces to surfaces and the data device manager
|
|
* handles the clipboard. Each of these wlroots interfaces has room for you
|
|
* to dig your fingers in and play with their behavior if you want. Note that
|
|
* the clients cannot set the selection directly without compositor approval,
|
|
* see the handling of the request_set_selection event below.*/
|
|
wlr_compositor_create(server.wl_display, server.renderer);
|
|
wlr_subcompositor_create(server.wl_display);
|
|
wlr_data_device_manager_create(server.wl_display);
|
|
|
|
/* Creates an output layout, which a wlroots utility for working with an
|
|
* arrangement of screens in a physical layout. */
|
|
server.output_layout = wlr_output_layout_create();
|
|
|
|
/* Configure a listener to be notified when new outputs are available on the
|
|
* backend. */
|
|
wl_list_init(&server.outputs);
|
|
server.new_output.notify = server_new_output;
|
|
wl_signal_add(&server.backend->events.new_output, &server.new_output);
|
|
|
|
/* Create a scene graph. This is a wlroots abstraction that handles all
|
|
* rendering and damage tracking. All the compositor author needs to do
|
|
* is add things that should be rendered to the scene graph at the proper
|
|
* positions and then call wlr_scene_output_commit() to render a frame if
|
|
* necessary.
|
|
*/
|
|
server.scene = wlr_scene_create();
|
|
wlr_scene_attach_output_layout(server.scene, server.output_layout);
|
|
|
|
/* Set up xdg-shell version 3. The xdg-shell is a Wayland protocol which is
|
|
* used for application windows. For more detail on shells, refer to my
|
|
* article:
|
|
*
|
|
* https://drewdevault.com/2018/07/29/Wayland-shells.html
|
|
*/
|
|
wl_list_init(&server.views);
|
|
server.xdg_shell = wlr_xdg_shell_create(server.wl_display, 3);
|
|
server.new_xdg_surface.notify = server_new_xdg_surface;
|
|
wl_signal_add(&server.xdg_shell->events.new_surface,
|
|
&server.new_xdg_surface);
|
|
|
|
/*
|
|
* Creates a cursor, which is a wlroots utility for tracking the cursor
|
|
* image shown on screen.
|
|
*/
|
|
server.cursor = wlr_cursor_create();
|
|
wlr_cursor_attach_output_layout(server.cursor, server.output_layout);
|
|
|
|
/* Creates an xcursor manager, another wlroots utility which loads up
|
|
* Xcursor themes to source cursor images from and makes sure that cursor
|
|
* images are available at all scale factors on the screen (necessary for
|
|
* HiDPI support). We add a cursor theme at scale factor 1 to begin with. */
|
|
server.cursor_mgr = wlr_xcursor_manager_create(NULL, 24);
|
|
wlr_xcursor_manager_load(server.cursor_mgr, 1);
|
|
|
|
/*
|
|
* wlr_cursor *only* displays an image on screen. It does not move around
|
|
* when the pointer moves. However, we can attach input devices to it, and
|
|
* it will generate aggregate events for all of them. In these events, we
|
|
* can choose how we want to process them, forwarding them to clients and
|
|
* moving the cursor around. More detail on this process is described in my
|
|
* input handling blog post:
|
|
*
|
|
* https://drewdevault.com/2018/07/17/Input-handling-in-wlroots.html
|
|
*
|
|
* And more comments are sprinkled throughout the notify functions above.
|
|
*/
|
|
server.cursor_mode = TINYWL_CURSOR_PASSTHROUGH;
|
|
server.cursor_motion.notify = server_cursor_motion;
|
|
wl_signal_add(&server.cursor->events.motion, &server.cursor_motion);
|
|
server.cursor_motion_absolute.notify = server_cursor_motion_absolute;
|
|
wl_signal_add(&server.cursor->events.motion_absolute,
|
|
&server.cursor_motion_absolute);
|
|
server.cursor_button.notify = server_cursor_button;
|
|
wl_signal_add(&server.cursor->events.button, &server.cursor_button);
|
|
server.cursor_axis.notify = server_cursor_axis;
|
|
wl_signal_add(&server.cursor->events.axis, &server.cursor_axis);
|
|
server.cursor_frame.notify = server_cursor_frame;
|
|
wl_signal_add(&server.cursor->events.frame, &server.cursor_frame);
|
|
|
|
/*
|
|
* Configures a seat, which is a single "seat" at which a user sits and
|
|
* operates the computer. This conceptually includes up to one keyboard,
|
|
* pointer, touch, and drawing tablet device. We also rig up a listener to
|
|
* let us know when new input devices are available on the backend.
|
|
*/
|
|
wl_list_init(&server.keyboards);
|
|
server.new_input.notify = server_new_input;
|
|
wl_signal_add(&server.backend->events.new_input, &server.new_input);
|
|
server.seat = wlr_seat_create(server.wl_display, "seat0");
|
|
server.request_cursor.notify = seat_request_cursor;
|
|
wl_signal_add(&server.seat->events.request_set_cursor,
|
|
&server.request_cursor);
|
|
server.request_set_selection.notify = seat_request_set_selection;
|
|
wl_signal_add(&server.seat->events.request_set_selection,
|
|
&server.request_set_selection);
|
|
|
|
/* Add a Unix socket to the Wayland display. */
|
|
const char *socket = wl_display_add_socket_auto(server.wl_display);
|
|
if (!socket) {
|
|
wlr_backend_destroy(server.backend);
|
|
return 1;
|
|
}
|
|
|
|
/* Start the backend. This will enumerate outputs and inputs, become the DRM
|
|
* master, etc */
|
|
if (!wlr_backend_start(server.backend)) {
|
|
wlr_backend_destroy(server.backend);
|
|
wl_display_destroy(server.wl_display);
|
|
return 1;
|
|
}
|
|
|
|
/* Set the WAYLAND_DISPLAY environment variable to our socket and run the
|
|
* startup command if requested. */
|
|
setenv("WAYLAND_DISPLAY", socket, true);
|
|
if (startup_cmd) {
|
|
if (fork() == 0) {
|
|
execl("/bin/sh", "/bin/sh", "-c", startup_cmd, (void *)NULL);
|
|
}
|
|
}
|
|
/* Run the Wayland event loop. This does not return until you exit the
|
|
* compositor. Starting the backend rigged up all of the necessary event
|
|
* loop configuration to listen to libinput events, DRM events, generate
|
|
* frame events at the refresh rate, and so on. */
|
|
wlr_log(WLR_INFO, "Running Wayland compositor on WAYLAND_DISPLAY=%s",
|
|
socket);
|
|
wl_display_run(server.wl_display);
|
|
|
|
/* Once wl_display_run returns, we shut down the server. */
|
|
wl_display_destroy_clients(server.wl_display);
|
|
wl_display_destroy(server.wl_display);
|
|
return 0;
|
|
}
|