wlroots/backend/x11/backend.c

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#define _POSIX_C_SOURCE 200112L
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#include <assert.h>
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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>
#include <wlr/config.h>
#include <X11/Xlib-xcb.h>
#include <wayland-server-core.h>
#include <xcb/xcb.h>
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#include <xcb/xfixes.h>
#include <xcb/xinput.h>
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#include <wlr/backend/interface.h>
#include <wlr/backend/x11.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/wlr_renderer.h>
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#include <wlr/util/log.h>
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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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}
static void handle_x11_event(struct wlr_x11_backend *x11,
xcb_generic_event_t *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_frame(&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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}
case XCB_GE_GENERIC: {
xcb_ge_generic_event_t *ev = (xcb_ge_generic_event_t *)event;
if (ev->extension == x11->xinput_opcode) {
handle_x11_xinput_event(x11, ev);
}
}
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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))) {
handle_x11_event(x11, e);
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free(e);
}
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return 0;
}
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struct wlr_x11_backend *get_x11_backend_from_backend(
struct wlr_backend *wlr_backend) {
assert(wlr_backend_is_x11(wlr_backend));
return (struct wlr_x11_backend *)wlr_backend;
}
static bool backend_start(struct wlr_backend *backend) {
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struct wlr_x11_backend *x11 = get_x11_backend_from_backend(backend);
x11->started = true;
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wlr_signal_emit_safe(&x11->backend.events.new_input, &x11->keyboard_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;
}
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struct wlr_x11_backend *x11 = get_x11_backend_from_backend(backend);
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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_input_device_destroy(&x11->keyboard_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->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) {
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struct wlr_x11_backend *x11 = get_x11_backend_from_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,
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const char *x11_display,
wlr_renderer_create_func_t create_renderer_func) {
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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) {
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wlr_log(WLR_ERROR, "Failed to open X connection");
goto error_x11;
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}
x11->xcb = XGetXCBConnection(x11->xlib_conn);
if (!x11->xcb || xcb_connection_has_error(x11->xcb)) {
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wlr_log(WLR_ERROR, "Failed to open xcb connection");
goto error_display;
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}
XSetEventQueueOwner(x11->xlib_conn, XCBOwnsEventQueue);
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,
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, atom[i].cookie, NULL);
if (reply) {
*atom[i].atom = reply->atom;
free(reply);
} else {
*atom[i].atom = XCB_ATOM_NONE;
}
}
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const xcb_query_extension_reply_t *ext;
ext = xcb_get_extension_data(x11->xcb, &xcb_xfixes_id);
if (!ext || !ext->present) {
wlr_log(WLR_ERROR, "X11 does not support Xfixes extension");
goto error_display;
}
xcb_xfixes_query_version_cookie_t fixes_cookie =
xcb_xfixes_query_version(x11->xcb, 4, 0);
xcb_xfixes_query_version_reply_t *fixes_reply =
xcb_xfixes_query_version_reply(x11->xcb, fixes_cookie, NULL);
if (!fixes_reply || fixes_reply->major_version < 4) {
wlr_log(WLR_ERROR, "X11 does not support required Xfixes version");
free(fixes_reply);
goto error_display;
}
free(fixes_reply);
ext = xcb_get_extension_data(x11->xcb, &xcb_input_id);
if (!ext || !ext->present) {
wlr_log(WLR_ERROR, "X11 does not support Xinput extension");
goto error_display;
}
x11->xinput_opcode = ext->major_opcode;
xcb_input_xi_query_version_cookie_t xi_cookie =
xcb_input_xi_query_version(x11->xcb, 2, 0);
xcb_input_xi_query_version_reply_t *xi_reply =
xcb_input_xi_query_version_reply(x11->xcb, xi_cookie, NULL);
if (!xi_reply || xi_reply->major_version < 2) {
wlr_log(WLR_ERROR, "X11 does not support required Xinput version");
free(xi_reply);
goto error_display;
}
free(xi_reply);
int fd = xcb_get_file_descriptor(x11->xcb);
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struct wl_event_loop *ev = wl_display_get_event_loop(display);
uint32_t events = WL_EVENT_READABLE | WL_EVENT_ERROR | WL_EVENT_HANGUP;
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x11->event_source = wl_event_loop_add_fd(ev, fd, events, x11_event, x11);
if (!x11->event_source) {
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wlr_log(WLR_ERROR, "Could not create event source");
goto error_display;
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}
wl_event_source_check(x11->event_source);
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x11->screen = xcb_setup_roots_iterator(xcb_get_setup(x11->xcb)).data;
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if (!create_renderer_func) {
create_renderer_func = wlr_renderer_autocreate;
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}
static EGLint config_attribs[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RED_SIZE, 1,
EGL_GREEN_SIZE, 1,
EGL_BLUE_SIZE, 1,
EGL_ALPHA_SIZE, 0,
EGL_NONE,
};
x11->renderer = create_renderer_func(&x11->egl, EGL_PLATFORM_X11_KHR,
x11->xlib_conn, config_attribs, x11->screen->root_visual);
if (x11->renderer == NULL) {
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wlr_log(WLR_ERROR, "Failed to create renderer");
goto error_event;
}
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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;
x11->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &x11->display_destroy);
return &x11->backend;
error_event:
wl_event_source_remove(x11->event_source);
error_display:
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XCloseDisplay(x11->xlib_conn);
error_x11:
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free(x11);
return NULL;
}