4 * i3 - an improved dynamic tiling window manager
6 * © 2009 Michael Stapelberg and contributors
8 * See file LICENSE for license information.
19 #include <xcb/xinerama.h>
30 #include "workspace.h"
32 /* This TAILQ of i3Screens stores the virtual screens, used for handling overlapping screens
33 * (xrandr --same-as) */
34 struct screens_head *virtual_screens;
36 static bool xinerama_enabled = true;
39 * Returns true if both screen objects describe the same screen (checks their
43 bool screens_are_equal(i3Screen *screen1, i3Screen *screen2) {
44 /* If one of both objects (or both) are NULL, we cannot compare them */
45 if (screen1 == NULL || screen2 == NULL)
48 /* If the pointers are equal, take the short-circuit */
49 if (screen1 == screen2)
52 /* Compare their size - other properties are not relevant to determine
53 * if a screen is equal to another one */
54 return (memcmp(&(screen1->rect), &(screen2->rect), sizeof(Rect)) == 0);
58 * Looks in virtual_screens for the i3Screen whose start coordinates are x, y
61 i3Screen *get_screen_at(int x, int y, struct screens_head *screenlist) {
63 TAILQ_FOREACH(screen, screenlist, screens)
64 if (screen->rect.x == x && screen->rect.y == y)
71 * Looks in virtual_screens for the i3Screen which contains coordinates x, y
74 i3Screen *get_screen_containing(int x, int y) {
76 TAILQ_FOREACH(screen, virtual_screens, screens) {
77 LOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
78 x, y, screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
79 if (x >= screen->rect.x && x < (screen->rect.x + screen->rect.width) &&
80 y >= screen->rect.y && y < (screen->rect.y + screen->rect.height))
88 * Gets the screen which is the last one in the given direction, for example the screen
89 * on the most bottom when direction == D_DOWN, the screen most right when direction == D_RIGHT
92 * This function always returns a screen.
95 i3Screen *get_screen_most(direction_t direction) {
96 i3Screen *screen, *candidate = NULL;
98 TAILQ_FOREACH(screen, virtual_screens, screens) {
99 /* Repeated calls of WIN determine the winner of the comparison */
100 #define WIN(variable, condition) \
101 if (variable condition) { \
102 candidate = screen; \
103 position = variable; \
109 WIN(screen->rect.y, <= position);
111 WIN(screen->rect.y, >= position);
113 WIN(screen->rect.x, <= position);
115 WIN(screen->rect.x, >= position);
119 assert(candidate != NULL);
124 static void initialize_screen(xcb_connection_t *conn, i3Screen *screen, Workspace *workspace) {
125 i3Font *font = load_font(conn, config.font);
127 workspace->screen = screen;
128 screen->current_workspace = workspace->num;
130 /* Create a bar for each screen */
131 Rect bar_rect = {screen->rect.x,
132 screen->rect.height - (font->height + 6),
133 screen->rect.x + screen->rect.width,
135 uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
136 uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
137 screen->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
138 screen->bargc = xcb_generate_id(conn);
139 xcb_create_gc(conn, screen->bargc, screen->bar, 0, 0);
141 SLIST_INIT(&(screen->dock_clients));
143 LOG("that is virtual screen at %d x %d with %d x %d\n",
144 screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
148 * Fills virtual_screens with exactly one screen with width/height of the whole X server.
151 static void disable_xinerama(xcb_connection_t *conn) {
152 xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
154 i3Screen *s = calloc(sizeof(i3Screen), 1);
158 s->rect.width = root_screen->width_in_pixels;
159 s->rect.height = root_screen->height_in_pixels;
164 TAILQ_INSERT_TAIL(virtual_screens, s, screens);
166 xinerama_enabled = false;
170 * Gets the Xinerama screens and converts them to virtual i3Screens (only one screen for two
171 * Xinerama screen which are configured in clone mode) in the given screenlist
174 static void query_screens(xcb_connection_t *conn, struct screens_head *screenlist) {
175 xcb_xinerama_query_screens_reply_t *reply;
176 xcb_xinerama_screen_info_t *screen_info;
177 time_t before_trying = time(NULL);
179 /* Try repeatedly to find screens (there might be short timeframes in
180 * which the X server does not return any screens, such as when rotating
181 * screens), but not longer than 5 seconds (strictly speaking, only four
182 * seconds of trying are guaranteed due to the 1-second-resolution) */
183 while ((time(NULL) - before_trying) < 5) {
184 reply = xcb_xinerama_query_screens_reply(conn, xcb_xinerama_query_screens_unchecked(conn), NULL);
186 LOG("Couldn't get Xinerama screens\n");
189 screen_info = xcb_xinerama_query_screens_screen_info(reply);
190 int screens = xcb_xinerama_query_screens_screen_info_length(reply);
193 for (int screen = 0; screen < screens; screen++) {
194 i3Screen *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org, screenlist);
196 /* This screen already exists. We use the littlest screen so that the user
197 can always see the complete workspace */
198 s->rect.width = min(s->rect.width, screen_info[screen].width);
199 s->rect.height = min(s->rect.height, screen_info[screen].height);
201 s = calloc(sizeof(i3Screen), 1);
202 s->rect.x = screen_info[screen].x_org;
203 s->rect.y = screen_info[screen].y_org;
204 s->rect.width = screen_info[screen].width;
205 s->rect.height = screen_info[screen].height;
206 /* We always treat the screen at 0x0 as the primary screen */
207 if (s->rect.x == 0 && s->rect.y == 0)
208 TAILQ_INSERT_HEAD(screenlist, s, screens);
209 else TAILQ_INSERT_TAIL(screenlist, s, screens);
213 LOG("found Xinerama screen: %d x %d at %d x %d\n",
214 screen_info[screen].width, screen_info[screen].height,
215 screen_info[screen].x_org, screen_info[screen].y_org);
220 if (num_screens == 0) {
221 LOG("No screens found. This is weird. Trying again...\n");
230 * We have just established a connection to the X server and need the initial Xinerama
231 * information to setup workspaces for each screen.
234 void initialize_xinerama(xcb_connection_t *conn) {
235 virtual_screens = scalloc(sizeof(struct screens_head));
236 TAILQ_INIT(virtual_screens);
238 if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
239 LOG("Xinerama extension not found, disabling.\n");
240 disable_xinerama(conn);
244 xcb_xinerama_is_active_reply_t *reply;
245 reply = xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL);
247 if (reply == NULL || !reply->state) {
248 LOG("Xinerama is not active (in your X-Server), disabling.\n");
249 disable_xinerama(conn);
251 query_screens(conn, virtual_screens);
257 /* Just go through each workspace and associate as many screens as we can. */
258 TAILQ_FOREACH(screen, virtual_screens, screens) {
259 screen->num = num_screens;
261 Workspace *ws = get_first_workspace_for_screen(virtual_screens, screen);
262 initialize_screen(conn, screen, ws);
267 * This is called when the rootwindow receives a configure_notify event and therefore the
268 * number/position of the Xinerama screens could have changed.
271 void xinerama_requery_screens(xcb_connection_t *conn) {
272 i3Font *font = load_font(conn, config.font);
274 /* POSSIBLE PROBLEM: Is the order of the Xinerama screens always constant? That is, can
275 it change when I move the --right-of video projector to --left-of? */
277 if (!xinerama_enabled) {
278 LOG("Xinerama is disabled\n");
282 /* We use a separate copy to diff with the previous set of screens */
283 struct screens_head *new_screens = scalloc(sizeof(struct screens_head));
284 TAILQ_INIT(new_screens);
286 query_screens(conn, new_screens);
288 i3Screen *first = TAILQ_FIRST(new_screens),
291 int screen_count = 0;
292 /* Mark each workspace which currently is assigned to a screen, so we
293 * can garbage-collect afterwards */
294 for (int c = 0; c < 10; c++)
295 workspaces[c].reassigned = (workspaces[c].screen == NULL);
297 TAILQ_FOREACH(screen, new_screens, screens) {
298 screen->num = screen_count;
299 screen->current_workspace = -1;
301 TAILQ_FOREACH(old_screen, virtual_screens, screens) {
302 if (old_screen->num != screen_count)
305 LOG("Found a matching screen\n");
306 /* Use the same workspace */
307 screen->current_workspace = old_screen->current_workspace;
309 /* Re-use the old bar window */
310 screen->bar = old_screen->bar;
311 screen->bargc = old_screen->bargc;
312 LOG("old_screen->bar = %p\n", old_screen->bar);
314 Rect bar_rect = {screen->rect.x,
315 screen->rect.height - (font->height + 6),
316 screen->rect.x + screen->rect.width,
319 LOG("configuring bar to be at %d x %d with %d x %d\n",
320 bar_rect.x, bar_rect.y, bar_rect.height, bar_rect.width);
321 xcb_configure_window(conn, screen->bar, XCB_CONFIG_WINDOW_X |
322 XCB_CONFIG_WINDOW_Y |
323 XCB_CONFIG_WINDOW_WIDTH |
324 XCB_CONFIG_WINDOW_HEIGHT, &(bar_rect.x));
326 /* Copy the list head for the dock clients */
327 screen->dock_clients = old_screen->dock_clients;
329 /* Update the dimensions */
330 for (int c = 0; c < 10; c++) {
331 Workspace *ws = &(workspaces[c]);
332 if (ws->screen != old_screen)
335 LOG("re-assigning ws %d\n", ws->num);
336 memcpy(&(ws->rect), &(screen->rect), sizeof(Rect));
338 ws->reassigned = true;
343 if (screen->current_workspace == -1) {
344 /* Find the first unused workspace, preferring the ones
345 * which are assigned to this screen and initialize
346 * the screen with it. */
347 LOG("getting first ws for screen %p\n", screen);
348 Workspace *ws = get_first_workspace_for_screen(new_screens, screen);
349 initialize_screen(conn, screen, ws);
351 /* As this workspace just got visible (we got a new screen
352 * without workspace), we need to map its clients */
353 workspace_map_clients(conn, ws);
358 /* Check for workspaces which are out of bounds */
359 for (int c = 0; c < 10; c++) {
360 if (workspaces[c].reassigned)
363 /* f_ws is a shortcut to the workspace to fix */
364 Workspace *f_ws = &(workspaces[c]);
367 LOG("Closing bar window (%p)\n", f_ws->screen->bar);
368 xcb_destroy_window(conn, f_ws->screen->bar);
370 LOG("Workspace %d's screen out of bounds, assigning to first screen\n", c+1);
371 f_ws->screen = first;
372 memcpy(&(f_ws->rect), &(first->rect), sizeof(Rect));
374 /* Force reconfiguration for each client on that workspace */
376 CIRCLEQ_FOREACH(client, &(f_ws->table[cols][rows]->clients), clients)
377 client->force_reconfigure = true;
379 /* Render the workspace to reconfigure the clients. However, they will be visible now, so… */
380 render_workspace(conn, first, f_ws);
382 /* …unless we want to see them at the moment, we should hide that workspace */
383 if (workspace_is_visible(f_ws))
386 workspace_unmap_clients(conn, f_ws);
389 LOG("Need to adjust c_ws...\n");
390 c_ws = &(workspaces[first->current_workspace]);
395 /* Free the old list */
396 while (!TAILQ_EMPTY(virtual_screens)) {
397 screen = TAILQ_FIRST(virtual_screens);
398 TAILQ_REMOVE(virtual_screens, screen, screens);
401 free(virtual_screens);
403 virtual_screens = new_screens;
405 LOG("Current workspace is now: %d\n", first->current_workspace);