4 * i3 - an improved dynamic tiling window manager
6 * © 2009-2010 Michael Stapelberg and contributors
8 * See file LICENSE for license information.
10 * For more information on RandR, please see the X.org RandR specification at
11 * http://cgit.freedesktop.org/xorg/proto/randrproto/tree/randrproto.txt
12 * (take your time to read it completely, it answers all questions).
24 #include <xcb/randr.h>
34 #include "workspace.h"
38 /* While a clean namespace is usually a pretty good thing, we really need
39 * to use shorter names than the whole xcb_randr_* default names. */
40 typedef xcb_randr_get_crtc_info_reply_t crtc_info;
41 typedef xcb_randr_mode_info_t mode_info;
42 typedef xcb_randr_get_screen_resources_current_reply_t resources_reply;
44 /* Stores all outputs available in your current session. */
45 struct outputs_head outputs = TAILQ_HEAD_INITIALIZER(outputs);
48 * Get a specific output by its internal X11 id. Used by randr_query_screens
49 * to check if the output is new (only in the first scan) or if we are
53 static Output *get_output_by_id(xcb_randr_output_t id) {
55 TAILQ_FOREACH(output, &outputs, outputs)
63 * Returns the output with the given name if it is active (!) or NULL.
66 Output *get_output_by_name(const char *name) {
68 TAILQ_FOREACH(output, &outputs, outputs)
70 strcasecmp(output->name, name) == 0)
77 * Returns the first output which is active.
80 Output *get_first_output() {
83 TAILQ_FOREACH(screen, &outputs, outputs) {
92 * Looks in virtual_screens for the Output which contains coordinates x, y
95 Output *get_screen_containing(int x, int y) {
97 TAILQ_FOREACH(screen, &outputs, outputs) {
100 DLOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
101 x, y, screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
102 if (x >= screen->rect.x && x < (screen->rect.x + screen->rect.width) &&
103 y >= screen->rect.y && y < (screen->rect.y + screen->rect.height))
111 * Gets the screen which is the last one in the given direction, for example the screen
112 * on the most bottom when direction == D_DOWN, the screen most right when direction == D_RIGHT
115 * This function always returns a screen.
118 Output *get_screen_most(direction_t direction, Output *current) {
119 Output *screen, *candidate = NULL;
121 TAILQ_FOREACH(screen, &outputs, outputs) {
125 /* Repeated calls of WIN determine the winner of the comparison */
126 #define WIN(variable, condition) \
127 if (variable condition) { \
128 candidate = screen; \
129 position = variable; \
133 if (((direction == D_UP) || (direction == D_DOWN)) &&
134 (current->rect.x != screen->rect.x))
137 if (((direction == D_LEFT) || (direction == D_RIGHT)) &&
138 (current->rect.y != screen->rect.y))
143 WIN(screen->rect.y, <= position);
145 WIN(screen->rect.y, >= position);
147 WIN(screen->rect.x, <= position);
149 WIN(screen->rect.x, >= position);
153 assert(candidate != NULL);
158 static void initialize_output(xcb_connection_t *conn, Output *output,
159 Workspace *workspace) {
160 i3Font *font = load_font(conn, config.font);
162 workspace->output = output;
163 output->current_workspace = workspace;
165 /* Create a xoutput for each output */
166 Rect bar_rect = {output->rect.x,
167 output->rect.y + output->rect.height - (font->height + 6),
168 output->rect.x + output->rect.width,
170 uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
171 uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
172 output->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
173 output->bargc = xcb_generate_id(conn);
174 xcb_create_gc(conn, output->bargc, output->bar, 0, 0);
176 SLIST_INIT(&(output->dock_clients));
178 DLOG("initialized output at (%d, %d) with %d x %d\n",
179 output->rect.x, output->rect.y, output->rect.width, output->rect.height);
183 * Fills virtual_screens with exactly one screen with width/height of the
187 static void disable_randr(xcb_connection_t *conn) {
188 xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
190 DLOG("RandR extension not found, disabling.\n");
192 Output *s = scalloc(sizeof(Output));
197 s->rect.width = root_screen->width_in_pixels;
198 s->rect.height = root_screen->height_in_pixels;
200 TAILQ_INSERT_TAIL(&outputs, s, outputs);
204 * Searches for a mode in the current RandR configuration by the mode id.
205 * Returns NULL if no such mode could be found (should never happen).
208 static mode_info *get_mode_by_id(resources_reply *reply, xcb_randr_mode_t mode) {
209 xcb_randr_mode_info_iterator_t it;
211 for (it = xcb_randr_get_screen_resources_current_modes_iterator(reply);
213 xcb_randr_mode_info_next(&it)) {
214 if (it.data->id == mode)
222 * This function needs to be called when changing the mode of an output when
223 * it already has some workspaces (or a bar window) assigned.
225 * It reconfigures the bar window for the new mode, copies the new rect into
226 * each workspace on this output and forces all windows on the affected
227 * workspaces to be reconfigured.
229 * It is necessary to call render_layout() afterwards.
232 static void output_change_mode(xcb_connection_t *conn, Output *output) {
233 i3Font *font = load_font(conn, config.font);
237 DLOG("Output mode changed, reconfiguring bar, updating workspaces\n");
238 Rect bar_rect = {output->rect.x,
239 output->rect.y + output->rect.height - (font->height + 6),
240 output->rect.x + output->rect.width,
243 xcb_set_window_rect(conn, output->bar, bar_rect);
245 /* go through all workspaces and set force_reconfigure */
246 TAILQ_FOREACH(ws, workspaces, workspaces) {
247 if (ws->output != output)
250 /* Update dimensions from output */
251 memcpy(&(ws->rect), &(ws->output->rect), sizeof(Rect));
253 SLIST_FOREACH(client, &(ws->focus_stack), focus_clients)
254 client->force_reconfigure = true;
256 /* Update the dimensions of a fullscreen client, if any */
257 if (ws->fullscreen_client != NULL) {
258 DLOG("Updating fullscreen client size\n");
259 client = ws->fullscreen_client;
261 xcb_set_window_rect(conn, client->frame, r);
265 xcb_set_window_rect(conn, client->child, r);
271 * Gets called by randr_query_screens() for each output. The function adds new
272 * outputs to the list of outputs, checks if the mode of existing outputs has
273 * been changed or if an existing output has been disabled. It will then change
274 * either the "changed" or the "to_be_deleted" flag of the output, if
278 static void handle_output(xcb_connection_t *conn, xcb_randr_output_t id,
279 xcb_randr_get_output_info_reply_t *output,
280 xcb_timestamp_t cts, resources_reply *res) {
281 /* each CRT controller has a position in which we are interested in */
284 /* the CRTC runs in a specific mode, while the position is stored in
285 * the output itself */
288 Output *new = get_output_by_id(id);
289 bool existing = (new != NULL);
291 new = scalloc(sizeof(Output));
293 asprintf(&new->name, "%.*s",
294 xcb_randr_get_output_info_name_length(output),
295 xcb_randr_get_output_info_name(output));
297 DLOG("found output with name %s\n", new->name);
299 /* Even if no CRTC is used at the moment, we store the output so that
300 * we do not need to change the list ever again (we only update the
302 if (output->crtc == XCB_NONE) {
304 TAILQ_INSERT_TAIL(&outputs, new, outputs);
305 else if (new->active) {
306 new->to_be_disabled = true;
313 xcb_randr_get_crtc_info_cookie_t icookie;
314 icookie = xcb_randr_get_crtc_info(conn, output->crtc, cts);
315 if ((crtc = xcb_randr_get_crtc_info_reply(conn, icookie, NULL)) == NULL ||
316 (mode = get_mode_by_id(res, crtc->mode)) == NULL) {
317 DLOG("Skipping output %s: could not get CRTC/mode (%p/%p)\n",
318 new->name, crtc, mode);
325 bool updated = update_if_necessary(&(new->rect.x), crtc->x) |
326 update_if_necessary(&(new->rect.y), crtc->y) |
327 update_if_necessary(&(new->rect.width), mode->width) |
328 update_if_necessary(&(new->rect.height), mode->height);
330 DLOG("mode: %dx%d+%d+%d\n", new->rect.width, new->rect.height,
331 new->rect.x, new->rect.y);
333 /* If we don’t need to change an existing output or if the output
334 * does not exist in the first place, the case is simple: we either
335 * need to insert the new output or we are done. */
336 if (!updated || !existing) {
338 TAILQ_INSERT_TAIL(&outputs, new, outputs);
347 * (Re-)queries the outputs via RandR and stores them in the list of outputs.
350 void randr_query_screens(xcb_connection_t *conn) {
352 xcb_randr_get_screen_resources_current_cookie_t rcookie;
353 resources_reply *res;
354 /* timestamp of the configuration so that we get consistent replies to all
355 * requests (if the configuration changes between our different calls) */
358 /* an output is VGA-1, LVDS-1, etc. (usually physical video outputs) */
359 xcb_randr_output_t *randr_outputs;
361 /* Get screen resources (crtcs, outputs, modes) */
362 rcookie = xcb_randr_get_screen_resources_current(conn, root);
363 if ((res = xcb_randr_get_screen_resources_current_reply(conn, rcookie, NULL)) == NULL)
364 die("Could not get RandR screen resources\n");
365 cts = res->config_timestamp;
367 int len = xcb_randr_get_screen_resources_current_outputs_length(res);
368 randr_outputs = xcb_randr_get_screen_resources_current_outputs(res);
370 /* Request information for each output */
371 xcb_randr_get_output_info_cookie_t ocookie[len];
372 for (int i = 0; i < len; i++)
373 ocookie[i] = xcb_randr_get_output_info(conn, randr_outputs[i], cts);
375 /* Loop through all outputs available for this X11 screen */
376 for (int i = 0; i < len; i++) {
377 xcb_randr_get_output_info_reply_t *output;
379 if ((output = xcb_randr_get_output_info_reply(conn, ocookie[i], NULL)) == NULL)
382 handle_output(conn, randr_outputs[i], output, cts, res);
386 Output *screen, *oscreen;
387 /* Check for clones and reduce the mode to the lowest common mode */
388 TAILQ_FOREACH(screen, &outputs, outputs) {
389 if (!screen->active || screen->to_be_disabled)
391 DLOG("screen %p, position (%d, %d), checking for clones\n",
392 screen, screen->rect.x, screen->rect.y);
394 for (oscreen = screen;
395 oscreen != TAILQ_END(&outputs);
396 oscreen = TAILQ_NEXT(oscreen, outputs)) {
397 if (oscreen == screen || !oscreen->active || oscreen->to_be_disabled)
400 if (oscreen->rect.x != screen->rect.x ||
401 oscreen->rect.y != screen->rect.y)
404 DLOG("screen %p has the same position, his mode = %d x %d\n",
405 oscreen, oscreen->rect.width, oscreen->rect.height);
406 uint32_t width = min(oscreen->rect.width, screen->rect.width);
407 uint32_t height = min(oscreen->rect.height, screen->rect.height);
409 if (update_if_necessary(&(screen->rect.width), width) |
410 update_if_necessary(&(screen->rect.height), height))
411 screen->changed = true;
413 update_if_necessary(&(oscreen->rect.width), width);
414 update_if_necessary(&(oscreen->rect.height), height);
416 DLOG("disabling screen %p (%s)\n", oscreen, oscreen->name);
417 oscreen->to_be_disabled = true;
419 DLOG("new screen mode %d x %d, oscreen mode %d x %d\n",
420 screen->rect.width, screen->rect.height,
421 oscreen->rect.width, oscreen->rect.height);
425 Output *output, *first;
426 TAILQ_FOREACH(output, &outputs, outputs) {
427 if (output->to_be_disabled) {
428 output->active = false;
429 DLOG("Output %s disabled, re-assigning workspaces/docks\n", output->name);
431 if ((first = get_first_output()) == NULL)
432 die("No usable outputs available\n");
434 bool needs_init = (first->current_workspace == NULL);
436 TAILQ_FOREACH(ws, workspaces, workspaces) {
437 if (ws->output != output)
440 workspace_assign_to(ws, first);
443 initialize_output(conn, first, ws);
448 while (!SLIST_EMPTY(&(output->dock_clients))) {
449 dock = SLIST_FIRST(&(output->dock_clients));
450 SLIST_INSERT_HEAD(&(first->dock_clients), dock, dock_clients);
451 SLIST_REMOVE_HEAD(&(output->dock_clients), dock_clients);
453 output->current_workspace = NULL;
454 output->to_be_disabled = false;
455 } else if (output->changed) {
456 output_change_mode(conn, output);
457 output->changed = false;
461 ewmh_update_workarea();
463 /* Just go through each active output and associate one workspace */
464 TAILQ_FOREACH(screen, &outputs, outputs) {
465 if (!screen->active || screen->current_workspace != NULL)
467 ws = get_first_workspace_for_screen(screen);
468 initialize_output(conn, screen, ws);
471 /* render_layout flushes */
476 * We have just established a connection to the X server and need the initial
477 * XRandR information to setup workspaces for each screen.
480 void initialize_randr(xcb_connection_t *conn, int *event_base) {
481 const xcb_query_extension_reply_t *extreply;
483 extreply = xcb_get_extension_data(conn, &xcb_randr_id);
484 if (!extreply->present)
486 else randr_query_screens(conn);
488 if (event_base != NULL)
489 *event_base = extreply->first_event;
491 xcb_randr_select_input(conn, root,
492 XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
493 XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
494 XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE |
495 XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY);