wlroots/backend/x11/backend.c

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#define _POSIX_C_SOURCE 200112L
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#include <limits.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <wayland-server.h>
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#include <wlr/backend/interface.h>
#include <wlr/backend/x11.h>
#include <wlr/config.h>
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#include <wlr/interfaces/wlr_input_device.h>
#include <wlr/interfaces/wlr_keyboard.h>
#include <wlr/interfaces/wlr_pointer.h>
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#include <wlr/render/egl.h>
#include <wlr/render/gles2.h>
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#include <wlr/util/log.h>
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#include <X11/Xlib-xcb.h>
#include <xcb/xcb.h>
#ifdef WLR_HAS_XCB_XKB
#include <xcb/xkb.h>
#endif
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#include "backend/x11.h"
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#include "util/signal.h"
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struct wlr_x11_output *get_x11_output_from_window_id(struct wlr_x11_backend *x11,
xcb_window_t window) {
struct wlr_x11_output *output;
wl_list_for_each(output, &x11->outputs, link) {
if (output->win == window) {
return output;
}
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}
return NULL;
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}
void get_x11_output_layout_box(struct wlr_x11_backend *backend,
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struct wlr_box *box) {
int min_x = INT_MAX, min_y = INT_MAX;
int max_x = INT_MIN, max_y = INT_MIN;
struct wlr_x11_output *output;
wl_list_for_each(output, &backend->outputs, link) {
struct wlr_output *wlr_output = &output->wlr_output;
int width, height;
wlr_output_effective_resolution(wlr_output, &width, &height);
if (wlr_output->lx < min_x) {
min_x = wlr_output->lx;
}
if (wlr_output->ly < min_y) {
min_y = wlr_output->ly;
}
if (wlr_output->lx + width > max_x) {
max_x = wlr_output->lx + width;
}
if (wlr_output->ly + height > max_y) {
max_y = wlr_output->ly + height;
}
}
box->x = min_x;
box->y = min_y;
box->width = max_x - min_x;
box->height = max_y - min_y;
}
static void handle_x11_event(struct wlr_x11_backend *x11,
xcb_generic_event_t *event) {
handle_x11_input_event(x11, event);
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switch (event->response_type & XCB_EVENT_RESPONSE_TYPE_MASK) {
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case XCB_EXPOSE: {
xcb_expose_event_t *ev = (xcb_expose_event_t *)event;
struct wlr_x11_output *output =
get_x11_output_from_window_id(x11, ev->window);
if (output != NULL) {
wlr_output_update_needs_swap(&output->wlr_output);
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}
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break;
}
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case XCB_CONFIGURE_NOTIFY: {
xcb_configure_notify_event_t *ev =
(xcb_configure_notify_event_t *)event;
struct wlr_x11_output *output =
get_x11_output_from_window_id(x11, ev->window);
if (output != NULL) {
handle_x11_configure_notify(output, ev);
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}
break;
}
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case XCB_CLIENT_MESSAGE: {
xcb_client_message_event_t *ev = (xcb_client_message_event_t *)event;
if (ev->data.data32[0] == x11->atoms.wm_delete_window) {
struct wlr_x11_output *output =
get_x11_output_from_window_id(x11, ev->window);
if (output != NULL) {
wlr_output_destroy(&output->wlr_output);
}
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}
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break;
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}
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}
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}
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static int x11_event(int fd, uint32_t mask, void *data) {
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struct wlr_x11_backend *x11 = data;
if ((mask & WL_EVENT_HANGUP) || (mask & WL_EVENT_ERROR)) {
wl_display_terminate(x11->wl_display);
return 0;
}
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xcb_generic_event_t *e;
while ((e = xcb_poll_for_event(x11->xcb_conn))) {
handle_x11_event(x11, e);
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free(e);
}
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return 0;
}
static bool backend_start(struct wlr_backend *backend) {
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struct wlr_x11_backend *x11 = (struct wlr_x11_backend *)backend;
x11->started = true;
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struct {
const char *name;
xcb_intern_atom_cookie_t cookie;
xcb_atom_t *atom;
} atom[] = {
{
.name = "WM_PROTOCOLS",
.atom = &x11->atoms.wm_protocols,
},
{
.name = "WM_DELETE_WINDOW",
.atom = &x11->atoms.wm_delete_window,
},
{
.name = "_NET_WM_NAME",
.atom = &x11->atoms.net_wm_name,
},
{
.name = "UTF8_STRING",
.atom = &x11->atoms.utf8_string,
},
};
for (size_t i = 0; i < sizeof(atom) / sizeof(atom[0]); ++i) {
atom[i].cookie = xcb_intern_atom(x11->xcb_conn,
true, strlen(atom[i].name), atom[i].name);
}
for (size_t i = 0; i < sizeof(atom) / sizeof(atom[0]); ++i) {
xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(
x11->xcb_conn, atom[i].cookie, NULL);
if (reply) {
*atom[i].atom = reply->atom;
free(reply);
} else {
*atom[i].atom = XCB_ATOM_NONE;
}
}
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// create a blank cursor
xcb_pixmap_t pix = xcb_generate_id(x11->xcb_conn);
xcb_create_pixmap(x11->xcb_conn, 1, pix, x11->screen->root, 1, 1);
x11->cursor = xcb_generate_id(x11->xcb_conn);
xcb_create_cursor(x11->xcb_conn, x11->cursor, pix, pix, 0, 0, 0, 0, 0, 0,
0, 0);
xcb_free_pixmap(x11->xcb_conn, pix);
#ifdef WLR_HAS_XCB_XKB
const xcb_query_extension_reply_t *reply =
xcb_get_extension_data(x11->xcb_conn, &xcb_xkb_id);
if (reply != NULL && reply->present) {
x11->xkb_base_event = reply->first_event;
x11->xkb_base_error = reply->first_error;
xcb_xkb_use_extension_cookie_t cookie = xcb_xkb_use_extension(
x11->xcb_conn, XCB_XKB_MAJOR_VERSION, XCB_XKB_MINOR_VERSION);
xcb_xkb_use_extension_reply_t *reply =
xcb_xkb_use_extension_reply(x11->xcb_conn, cookie, NULL);
if (reply != NULL && reply->supported) {
x11->xkb_supported = true;
xcb_xkb_select_events(x11->xcb_conn,
XCB_XKB_ID_USE_CORE_KBD,
XCB_XKB_EVENT_TYPE_STATE_NOTIFY,
0,
XCB_XKB_EVENT_TYPE_STATE_NOTIFY,
0,
0,
0);
}
}
#endif
wlr_signal_emit_safe(&x11->backend.events.new_input, &x11->keyboard_dev);
wlr_signal_emit_safe(&x11->backend.events.new_input, &x11->pointer_dev);
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for (size_t i = 0; i < x11->requested_outputs; ++i) {
wlr_x11_output_create(&x11->backend);
}
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return true;
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}
static void backend_destroy(struct wlr_backend *backend) {
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if (!backend) {
return;
}
struct wlr_x11_backend *x11 = (struct wlr_x11_backend *)backend;
struct wlr_x11_output *output, *tmp;
wl_list_for_each_safe(output, tmp, &x11->outputs, link) {
wlr_output_destroy(&output->wlr_output);
}
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wlr_signal_emit_safe(&x11->pointer_dev.events.destroy, &x11->pointer_dev);
wlr_signal_emit_safe(&x11->keyboard_dev.events.destroy, &x11->keyboard_dev);
wlr_input_device_destroy(&x11->keyboard_dev);
wlr_input_device_destroy(&x11->pointer_dev);
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wlr_signal_emit_safe(&backend->events.destroy, backend);
if (x11->event_source) {
wl_event_source_remove(x11->event_source);
}
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wl_list_remove(&x11->display_destroy.link);
wlr_renderer_destroy(x11->renderer);
wlr_egl_finish(&x11->egl);
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if (x11->cursor) {
xcb_free_cursor(x11->xcb_conn, x11->cursor);
}
if (x11->xlib_conn) {
XCloseDisplay(x11->xlib_conn);
}
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free(x11);
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}
static struct wlr_renderer *backend_get_renderer(
struct wlr_backend *backend) {
struct wlr_x11_backend *x11 = (struct wlr_x11_backend *)backend;
return x11->renderer;
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}
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static const struct wlr_backend_impl backend_impl = {
.start = backend_start,
.destroy = backend_destroy,
.get_renderer = backend_get_renderer,
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};
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bool wlr_backend_is_x11(struct wlr_backend *backend) {
return backend->impl == &backend_impl;
}
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static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_x11_backend *x11 =
wl_container_of(listener, x11, display_destroy);
backend_destroy(&x11->backend);
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}
struct wlr_backend *wlr_x11_backend_create(struct wl_display *display,
const char *x11_display) {
struct wlr_x11_backend *x11 = calloc(1, sizeof(*x11));
if (!x11) {
return NULL;
}
wlr_backend_init(&x11->backend, &backend_impl);
x11->wl_display = display;
wl_list_init(&x11->outputs);
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x11->xlib_conn = XOpenDisplay(x11_display);
if (!x11->xlib_conn) {
wlr_log(L_ERROR, "Failed to open X connection");
return NULL;
}
x11->xcb_conn = XGetXCBConnection(x11->xlib_conn);
if (!x11->xcb_conn || xcb_connection_has_error(x11->xcb_conn)) {
wlr_log(L_ERROR, "Failed to open xcb connection");
goto error_x11;
}
XSetEventQueueOwner(x11->xlib_conn, XCBOwnsEventQueue);
int fd = xcb_get_file_descriptor(x11->xcb_conn);
struct wl_event_loop *ev = wl_display_get_event_loop(display);
int events = WL_EVENT_READABLE | WL_EVENT_ERROR | WL_EVENT_HANGUP;
x11->event_source = wl_event_loop_add_fd(ev, fd, events, x11_event, x11);
if (!x11->event_source) {
wlr_log(L_ERROR, "Could not create event source");
goto error_x11;
}
x11->screen = xcb_setup_roots_iterator(xcb_get_setup(x11->xcb_conn)).data;
if (!wlr_egl_init(&x11->egl, EGL_PLATFORM_X11_KHR, x11->xlib_conn, NULL,
x11->screen->root_visual)) {
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goto error_event;
}
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x11->renderer = wlr_gles2_renderer_create(&x11->egl);
if (x11->renderer == NULL) {
wlr_log(L_ERROR, "Failed to create renderer");
goto error_egl;
}
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wlr_input_device_init(&x11->keyboard_dev, WLR_INPUT_DEVICE_KEYBOARD,
&input_device_impl, "X11 keyboard", 0, 0);
wlr_keyboard_init(&x11->keyboard, &keyboard_impl);
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x11->keyboard_dev.keyboard = &x11->keyboard;
wlr_input_device_init(&x11->pointer_dev, WLR_INPUT_DEVICE_POINTER,
&input_device_impl, "X11 pointer", 0, 0);
wlr_pointer_init(&x11->pointer, &pointer_impl);
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x11->pointer_dev.pointer = &x11->pointer;
x11->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &x11->display_destroy);
return &x11->backend;
error_egl:
wlr_egl_finish(&x11->egl);
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error_event:
wl_event_source_remove(x11->event_source);
error_x11:
XCloseDisplay(x11->xlib_conn);
free(x11);
return NULL;
}