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"
39 /* While a clean namespace is usually a pretty good thing, we really need
40 * to use shorter names than the whole xcb_randr_* default names. */
41 typedef xcb_randr_get_crtc_info_reply_t crtc_info;
42 typedef xcb_randr_mode_info_t mode_info;
43 typedef xcb_randr_get_screen_resources_current_reply_t resources_reply;
45 /* Stores all outputs available in your current session. */
46 struct outputs_head outputs = TAILQ_HEAD_INITIALIZER(outputs);
48 static bool randr_disabled = false;
51 * Get a specific output by its internal X11 id. Used by randr_query_outputs
52 * to check if the output is new (only in the first scan) or if we are
56 static Output *get_output_by_id(xcb_randr_output_t id) {
58 TAILQ_FOREACH(output, &outputs, outputs)
66 * Returns the output with the given name if it is active (!) or NULL.
69 Output *get_output_by_name(const char *name) {
71 TAILQ_FOREACH(output, &outputs, outputs)
73 strcasecmp(output->name, name) == 0)
80 * Returns the first output which is active.
83 Output *get_first_output() {
86 TAILQ_FOREACH(output, &outputs, outputs)
94 * Returns the active (!) output which contains the coordinates x, y or NULL
95 * if there is no output which contains these coordinates.
98 Output *get_output_containing(int x, int y) {
100 TAILQ_FOREACH(output, &outputs, outputs) {
103 DLOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
104 x, y, output->rect.x, output->rect.y, output->rect.width, output->rect.height);
105 if (x >= output->rect.x && x < (output->rect.x + output->rect.width) &&
106 y >= output->rect.y && y < (output->rect.y + output->rect.height))
114 * Gets the output which is the last one in the given direction, for example
115 * the output on the most bottom when direction == D_DOWN, the output most
116 * right when direction == D_RIGHT and so on.
118 * This function always returns a output.
121 Output *get_output_most(direction_t direction, Output *current) {
122 Output *output, *candidate = NULL;
124 TAILQ_FOREACH(output, &outputs, outputs) {
128 /* Repeated calls of WIN determine the winner of the comparison */
129 #define WIN(variable, condition) \
130 if (variable condition) { \
131 candidate = output; \
132 position = variable; \
136 if (((direction == D_UP) || (direction == D_DOWN)) &&
137 (current->rect.x != output->rect.x))
140 if (((direction == D_LEFT) || (direction == D_RIGHT)) &&
141 (current->rect.y != output->rect.y))
146 WIN(output->rect.y, <= position);
148 WIN(output->rect.y, >= position);
150 WIN(output->rect.x, <= position);
152 WIN(output->rect.x, >= position);
156 assert(candidate != NULL);
162 * Initializes the specified output, assigning the specified workspace to it.
165 void initialize_output(xcb_connection_t *conn, Output *output, Workspace *workspace) {
166 i3Font *font = load_font(conn, config.font);
168 workspace->output = output;
169 output->current_workspace = workspace;
171 /* Copy rect for the workspace */
172 memcpy(&(workspace->rect), &(output->rect), sizeof(Rect));
174 /* Map clients on the workspace, if any */
175 workspace_map_clients(conn, workspace);
177 /* Create a bar window on each output */
178 if (!config.disable_workspace_bar) {
179 Rect bar_rect = {output->rect.x,
180 output->rect.y + output->rect.height - (font->height + 6),
181 output->rect.x + output->rect.width,
183 uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
184 uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
185 output->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
186 output->bargc = xcb_generate_id(conn);
187 xcb_create_gc(conn, output->bargc, output->bar, 0, 0);
190 SLIST_INIT(&(output->dock_clients));
192 ipc_send_event("workspace", I3_IPC_EVENT_WORKSPACE, "{\"change\":\"init\"}");
193 DLOG("initialized output at (%d, %d) with %d x %d\n",
194 output->rect.x, output->rect.y, output->rect.width, output->rect.height);
198 * Disables RandR support by creating exactly one output with the size of the
202 void disable_randr(xcb_connection_t *conn) {
203 xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
205 DLOG("RandR extension unusable, disabling.\n");
207 Output *s = scalloc(sizeof(Output));
212 s->rect.width = root_screen->width_in_pixels;
213 s->rect.height = root_screen->height_in_pixels;
216 TAILQ_INSERT_TAIL(&outputs, s, outputs);
218 randr_disabled = true;
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_outputs() 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 Output *new = get_output_by_id(id);
285 bool existing = (new != NULL);
287 new = scalloc(sizeof(Output));
289 asprintf(&new->name, "%.*s",
290 xcb_randr_get_output_info_name_length(output),
291 xcb_randr_get_output_info_name(output));
293 DLOG("found output with name %s\n", new->name);
295 /* Even if no CRTC is used at the moment, we store the output so that
296 * we do not need to change the list ever again (we only update the
298 if (output->crtc == XCB_NONE) {
300 TAILQ_INSERT_TAIL(&outputs, new, outputs);
301 else if (new->active) {
302 new->to_be_disabled = true;
309 xcb_randr_get_crtc_info_cookie_t icookie;
310 icookie = xcb_randr_get_crtc_info(conn, output->crtc, cts);
311 if ((crtc = xcb_randr_get_crtc_info_reply(conn, icookie, NULL)) == NULL) {
312 DLOG("Skipping output %s: could not get CRTC (%p)\n",
320 bool updated = update_if_necessary(&(new->rect.x), crtc->x) |
321 update_if_necessary(&(new->rect.y), crtc->y) |
322 update_if_necessary(&(new->rect.width), crtc->width) |
323 update_if_necessary(&(new->rect.height), crtc->height);
325 DLOG("mode: %dx%d+%d+%d\n", new->rect.width, new->rect.height,
326 new->rect.x, new->rect.y);
328 /* If we don’t need to change an existing output or if the output
329 * does not exist in the first place, the case is simple: we either
330 * need to insert the new output or we are done. */
331 if (!updated || !existing) {
333 TAILQ_INSERT_TAIL(&outputs, new, outputs);
342 * (Re-)queries the outputs via RandR and stores them in the list of outputs.
345 void randr_query_outputs(xcb_connection_t *conn) {
347 Output *output, *other, *first;
348 xcb_randr_get_screen_resources_current_cookie_t rcookie;
349 resources_reply *res;
350 /* timestamp of the configuration so that we get consistent replies to all
351 * requests (if the configuration changes between our different calls) */
354 /* an output is VGA-1, LVDS-1, etc. (usually physical video outputs) */
355 xcb_randr_output_t *randr_outputs;
360 /* Get screen resources (crtcs, outputs, modes) */
361 rcookie = xcb_randr_get_screen_resources_current(conn, root);
362 if ((res = xcb_randr_get_screen_resources_current_reply(conn, rcookie, NULL)) == NULL) {
366 cts = res->config_timestamp;
368 int len = xcb_randr_get_screen_resources_current_outputs_length(res);
369 randr_outputs = xcb_randr_get_screen_resources_current_outputs(res);
371 /* Request information for each output */
372 xcb_randr_get_output_info_cookie_t ocookie[len];
373 for (int i = 0; i < len; i++)
374 ocookie[i] = xcb_randr_get_output_info(conn, randr_outputs[i], cts);
376 /* Loop through all outputs available for this X11 screen */
377 for (int i = 0; i < len; i++) {
378 xcb_randr_get_output_info_reply_t *output;
380 if ((output = xcb_randr_get_output_info_reply(conn, ocookie[i], NULL)) == NULL)
383 handle_output(conn, randr_outputs[i], output, cts, res);
387 /* Check for clones, disable the clones and reduce the mode to the
388 * lowest common mode */
389 TAILQ_FOREACH(output, &outputs, outputs) {
390 if (!output->active || output->to_be_disabled)
392 DLOG("output %p, position (%d, %d), checking for clones\n",
393 output, output->rect.x, output->rect.y);
396 other != TAILQ_END(&outputs);
397 other = TAILQ_NEXT(other, outputs)) {
398 if (other == output || !other->active || other->to_be_disabled)
401 if (other->rect.x != output->rect.x ||
402 other->rect.y != output->rect.y)
405 DLOG("output %p has the same position, his mode = %d x %d\n",
406 other, other->rect.width, other->rect.height);
407 uint32_t width = min(other->rect.width, output->rect.width);
408 uint32_t height = min(other->rect.height, output->rect.height);
410 if (update_if_necessary(&(output->rect.width), width) |
411 update_if_necessary(&(output->rect.height), height))
412 output->changed = true;
414 update_if_necessary(&(other->rect.width), width);
415 update_if_necessary(&(other->rect.height), height);
417 DLOG("disabling output %p (%s)\n", other, other->name);
418 other->to_be_disabled = true;
420 DLOG("new output mode %d x %d, other mode %d x %d\n",
421 output->rect.width, output->rect.height,
422 other->rect.width, other->rect.height);
426 /* Handle outputs which have a new mode or are disabled now (either
427 * because the user disabled them or because they are clones) */
428 TAILQ_FOREACH(output, &outputs, outputs) {
429 if (output->to_be_disabled) {
430 output->active = false;
431 DLOG("Output %s disabled, re-assigning workspaces/docks\n", output->name);
433 if ((first = get_first_output()) == NULL)
434 die("No usable outputs available\n");
436 bool needs_init = (first->current_workspace == NULL);
438 TAILQ_FOREACH(ws, workspaces, workspaces) {
439 if (ws->output != output)
442 workspace_assign_to(ws, first, true);
445 initialize_output(conn, first, ws);
450 while (!SLIST_EMPTY(&(output->dock_clients))) {
451 dock = SLIST_FIRST(&(output->dock_clients));
452 SLIST_REMOVE_HEAD(&(output->dock_clients), dock_clients);
453 SLIST_INSERT_HEAD(&(first->dock_clients), dock, dock_clients);
455 output->current_workspace = NULL;
456 output->to_be_disabled = false;
457 } else if (output->changed) {
458 output_change_mode(conn, output);
459 output->changed = false;
463 if (TAILQ_EMPTY(&outputs)) {
464 ELOG("No outputs found via RandR, disabling\n");
468 ewmh_update_workarea();
470 /* Just go through each active output and associate one workspace */
471 TAILQ_FOREACH(output, &outputs, outputs) {
472 if (!output->active || output->current_workspace != NULL)
474 ws = get_first_workspace_for_output(output);
475 initialize_output(conn, output, ws);
478 /* render_layout flushes */
483 * We have just established a connection to the X server and need the initial
484 * XRandR information to setup workspaces for each screen.
487 void initialize_randr(xcb_connection_t *conn, int *event_base) {
488 const xcb_query_extension_reply_t *extreply;
490 extreply = xcb_get_extension_data(conn, &xcb_randr_id);
491 if (!extreply->present)
493 else randr_query_outputs(conn);
495 if (event_base != NULL)
496 *event_base = extreply->first_event;
498 xcb_randr_select_input(conn, root,
499 XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
500 XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
501 XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE |
502 XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY);