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);
47 static bool randr_disabled = false;
50 * Get a specific output by its internal X11 id. Used by randr_query_outputs
51 * to check if the output is new (only in the first scan) or if we are
55 static Output *get_output_by_id(xcb_randr_output_t id) {
57 TAILQ_FOREACH(output, &outputs, outputs)
65 * Returns the output with the given name if it is active (!) or NULL.
68 Output *get_output_by_name(const char *name) {
70 TAILQ_FOREACH(output, &outputs, outputs)
72 strcasecmp(output->name, name) == 0)
79 * Returns the first output which is active.
82 Output *get_first_output() {
85 TAILQ_FOREACH(output, &outputs, outputs)
93 * Returns the active (!) output which contains the coordinates x, y or NULL
94 * if there is no output which contains these coordinates.
97 Output *get_output_containing(int x, int y) {
99 TAILQ_FOREACH(output, &outputs, outputs) {
102 DLOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
103 x, y, output->rect.x, output->rect.y, output->rect.width, output->rect.height);
104 if (x >= output->rect.x && x < (output->rect.x + output->rect.width) &&
105 y >= output->rect.y && y < (output->rect.y + output->rect.height))
113 * Gets the output which is the last one in the given direction, for example
114 * the output on the most bottom when direction == D_DOWN, the output most
115 * right when direction == D_RIGHT and so on.
117 * This function always returns a output.
120 Output *get_output_most(direction_t direction, Output *current) {
121 Output *output, *candidate = NULL;
123 TAILQ_FOREACH(output, &outputs, outputs) {
127 /* Repeated calls of WIN determine the winner of the comparison */
128 #define WIN(variable, condition) \
129 if (variable condition) { \
130 candidate = output; \
131 position = variable; \
135 if (((direction == D_UP) || (direction == D_DOWN)) &&
136 (current->rect.x != output->rect.x))
139 if (((direction == D_LEFT) || (direction == D_RIGHT)) &&
140 (current->rect.y != output->rect.y))
145 WIN(output->rect.y, <= position);
147 WIN(output->rect.y, >= position);
149 WIN(output->rect.x, <= position);
151 WIN(output->rect.x, >= position);
155 assert(candidate != NULL);
161 * Initializes the specified output, assigning the specified workspace to it.
164 void initialize_output(xcb_connection_t *conn, Output *output, Workspace *workspace) {
165 i3Font *font = load_font(conn, config.font);
167 workspace->output = output;
168 output->current_workspace = workspace;
170 /* Copy rect for the workspace */
171 memcpy(&(workspace->rect), &(output->rect), sizeof(Rect));
173 /* Map clients on the workspace, if any */
174 workspace_map_clients(conn, workspace);
176 /* Create a bar window on each output */
177 if (!config.disable_workspace_bar) {
178 Rect bar_rect = {output->rect.x,
179 output->rect.y + output->rect.height - (font->height + 6),
180 output->rect.x + output->rect.width,
182 uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
183 uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
184 output->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
185 output->bargc = xcb_generate_id(conn);
186 xcb_create_gc(conn, output->bargc, output->bar, 0, 0);
189 SLIST_INIT(&(output->dock_clients));
191 DLOG("initialized output at (%d, %d) with %d x %d\n",
192 output->rect.x, output->rect.y, output->rect.width, output->rect.height);
196 * Disables RandR support by creating exactly one output with the size of the
200 void disable_randr(xcb_connection_t *conn) {
201 xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
203 DLOG("RandR extension unusable, disabling.\n");
205 Output *s = scalloc(sizeof(Output));
210 s->rect.width = root_screen->width_in_pixels;
211 s->rect.height = root_screen->height_in_pixels;
214 TAILQ_INSERT_TAIL(&outputs, s, outputs);
216 randr_disabled = true;
220 * This function needs to be called when changing the mode of an output when
221 * it already has some workspaces (or a bar window) assigned.
223 * It reconfigures the bar window for the new mode, copies the new rect into
224 * each workspace on this output and forces all windows on the affected
225 * workspaces to be reconfigured.
227 * It is necessary to call render_layout() afterwards.
230 static void output_change_mode(xcb_connection_t *conn, Output *output) {
231 i3Font *font = load_font(conn, config.font);
235 DLOG("Output mode changed, reconfiguring bar, updating workspaces\n");
236 Rect bar_rect = {output->rect.x,
237 output->rect.y + output->rect.height - (font->height + 6),
238 output->rect.x + output->rect.width,
241 xcb_set_window_rect(conn, output->bar, bar_rect);
243 /* go through all workspaces and set force_reconfigure */
244 TAILQ_FOREACH(ws, workspaces, workspaces) {
245 if (ws->output != output)
248 /* Update dimensions from output */
249 memcpy(&(ws->rect), &(ws->output->rect), sizeof(Rect));
251 SLIST_FOREACH(client, &(ws->focus_stack), focus_clients)
252 client->force_reconfigure = true;
254 /* Update the dimensions of a fullscreen client, if any */
255 if (ws->fullscreen_client != NULL) {
256 DLOG("Updating fullscreen client size\n");
257 client = ws->fullscreen_client;
259 xcb_set_window_rect(conn, client->frame, r);
263 xcb_set_window_rect(conn, client->child, r);
269 * Gets called by randr_query_outputs() for each output. The function adds new
270 * outputs to the list of outputs, checks if the mode of existing outputs has
271 * been changed or if an existing output has been disabled. It will then change
272 * either the "changed" or the "to_be_deleted" flag of the output, if
276 static void handle_output(xcb_connection_t *conn, xcb_randr_output_t id,
277 xcb_randr_get_output_info_reply_t *output,
278 xcb_timestamp_t cts, resources_reply *res) {
279 /* each CRT controller has a position in which we are interested in */
282 Output *new = get_output_by_id(id);
283 bool existing = (new != NULL);
285 new = scalloc(sizeof(Output));
287 asprintf(&new->name, "%.*s",
288 xcb_randr_get_output_info_name_length(output),
289 xcb_randr_get_output_info_name(output));
291 DLOG("found output with name %s\n", new->name);
293 /* Even if no CRTC is used at the moment, we store the output so that
294 * we do not need to change the list ever again (we only update the
296 if (output->crtc == XCB_NONE) {
298 TAILQ_INSERT_TAIL(&outputs, new, outputs);
299 else if (new->active) {
300 new->to_be_disabled = true;
307 xcb_randr_get_crtc_info_cookie_t icookie;
308 icookie = xcb_randr_get_crtc_info(conn, output->crtc, cts);
309 if ((crtc = xcb_randr_get_crtc_info_reply(conn, icookie, NULL)) == NULL) {
310 DLOG("Skipping output %s: could not get CRTC (%p)\n",
318 bool updated = update_if_necessary(&(new->rect.x), crtc->x) |
319 update_if_necessary(&(new->rect.y), crtc->y) |
320 update_if_necessary(&(new->rect.width), crtc->width) |
321 update_if_necessary(&(new->rect.height), crtc->height);
323 DLOG("mode: %dx%d+%d+%d\n", new->rect.width, new->rect.height,
324 new->rect.x, new->rect.y);
326 /* If we don’t need to change an existing output or if the output
327 * does not exist in the first place, the case is simple: we either
328 * need to insert the new output or we are done. */
329 if (!updated || !existing) {
331 TAILQ_INSERT_TAIL(&outputs, new, outputs);
340 * (Re-)queries the outputs via RandR and stores them in the list of outputs.
343 void randr_query_outputs(xcb_connection_t *conn) {
345 Output *output, *other, *first;
346 xcb_randr_get_screen_resources_current_cookie_t rcookie;
347 resources_reply *res;
348 /* timestamp of the configuration so that we get consistent replies to all
349 * requests (if the configuration changes between our different calls) */
352 /* an output is VGA-1, LVDS-1, etc. (usually physical video outputs) */
353 xcb_randr_output_t *randr_outputs;
358 /* Get screen resources (crtcs, outputs, modes) */
359 rcookie = xcb_randr_get_screen_resources_current(conn, root);
360 if ((res = xcb_randr_get_screen_resources_current_reply(conn, rcookie, NULL)) == NULL) {
364 cts = res->config_timestamp;
366 int len = xcb_randr_get_screen_resources_current_outputs_length(res);
367 randr_outputs = xcb_randr_get_screen_resources_current_outputs(res);
369 /* Request information for each output */
370 xcb_randr_get_output_info_cookie_t ocookie[len];
371 for (int i = 0; i < len; i++)
372 ocookie[i] = xcb_randr_get_output_info(conn, randr_outputs[i], cts);
374 /* Loop through all outputs available for this X11 screen */
375 for (int i = 0; i < len; i++) {
376 xcb_randr_get_output_info_reply_t *output;
378 if ((output = xcb_randr_get_output_info_reply(conn, ocookie[i], NULL)) == NULL)
381 handle_output(conn, randr_outputs[i], output, cts, res);
385 /* Check for clones, disable the clones and reduce the mode to the
386 * lowest common mode */
387 TAILQ_FOREACH(output, &outputs, outputs) {
388 if (!output->active || output->to_be_disabled)
390 DLOG("output %p, position (%d, %d), checking for clones\n",
391 output, output->rect.x, output->rect.y);
394 other != TAILQ_END(&outputs);
395 other = TAILQ_NEXT(other, outputs)) {
396 if (other == output || !other->active || other->to_be_disabled)
399 if (other->rect.x != output->rect.x ||
400 other->rect.y != output->rect.y)
403 DLOG("output %p has the same position, his mode = %d x %d\n",
404 other, other->rect.width, other->rect.height);
405 uint32_t width = min(other->rect.width, output->rect.width);
406 uint32_t height = min(other->rect.height, output->rect.height);
408 if (update_if_necessary(&(output->rect.width), width) |
409 update_if_necessary(&(output->rect.height), height))
410 output->changed = true;
412 update_if_necessary(&(other->rect.width), width);
413 update_if_necessary(&(other->rect.height), height);
415 DLOG("disabling output %p (%s)\n", other, other->name);
416 other->to_be_disabled = true;
418 DLOG("new output mode %d x %d, other mode %d x %d\n",
419 output->rect.width, output->rect.height,
420 other->rect.width, other->rect.height);
424 /* Handle outputs which have a new mode or are disabled now (either
425 * because the user disabled them or because they are clones) */
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, true);
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 if (TAILQ_EMPTY(&outputs)) {
462 ELOG("No outputs found via RandR, disabling\n");
466 ewmh_update_workarea();
468 /* Just go through each active output and associate one workspace */
469 TAILQ_FOREACH(output, &outputs, outputs) {
470 if (!output->active || output->current_workspace != NULL)
472 ws = get_first_workspace_for_output(output);
473 initialize_output(conn, output, ws);
476 /* render_layout flushes */
481 * We have just established a connection to the X server and need the initial
482 * XRandR information to setup workspaces for each screen.
485 void initialize_randr(xcb_connection_t *conn, int *event_base) {
486 const xcb_query_extension_reply_t *extreply;
488 extreply = xcb_get_extension_data(conn, &xcb_randr_id);
489 if (!extreply->present)
491 else randr_query_outputs(conn);
493 if (event_base != NULL)
494 *event_base = extreply->first_event;
496 xcb_randr_select_input(conn, root,
497 XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
498 XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
499 XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE |
500 XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY);