]> git.sur5r.net Git - i3/i3/blob - src/randr.c
ipc/parser: commands can now return custom JSON replies
[i3/i3] / src / randr.c
1 /*
2  * vim:ts=8:expandtab
3  *
4  * i3 - an improved dynamic tiling window manager
5  *
6  * © 2009-2010 Michael Stapelberg and contributors
7  *
8  * See file LICENSE for license information.
9  *
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).
13  *
14  */
15 #include <time.h>
16
17 #include <xcb/randr.h>
18
19 #include "all.h"
20
21 /* While a clean namespace is usually a pretty good thing, we really need
22  * to use shorter names than the whole xcb_randr_* default names. */
23 typedef xcb_randr_get_crtc_info_reply_t crtc_info;
24 typedef xcb_randr_mode_info_t mode_info;
25 typedef xcb_randr_get_screen_resources_current_reply_t resources_reply;
26
27 /* Stores all outputs available in your current session. */
28 struct outputs_head outputs = TAILQ_HEAD_INITIALIZER(outputs);
29
30 static bool randr_disabled = false;
31
32 /*
33  * Get a specific output by its internal X11 id. Used by randr_query_outputs
34  * to check if the output is new (only in the first scan) or if we are
35  * re-scanning.
36  *
37  */
38 static Output *get_output_by_id(xcb_randr_output_t id) {
39         Output *output;
40         TAILQ_FOREACH(output, &outputs, outputs)
41                 if (output->id == id)
42                         return output;
43
44         return NULL;
45 }
46
47 /*
48  * Returns the output with the given name if it is active (!) or NULL.
49  *
50  */
51 Output *get_output_by_name(const char *name) {
52         Output *output;
53         TAILQ_FOREACH(output, &outputs, outputs)
54                 if (output->active &&
55                     strcasecmp(output->name, name) == 0)
56                         return output;
57
58         return NULL;
59 }
60
61 /*
62  * Returns the first output which is active.
63  *
64  */
65 Output *get_first_output() {
66         Output *output;
67
68         TAILQ_FOREACH(output, &outputs, outputs)
69                 if (output->active)
70                         return output;
71
72         return NULL;
73 }
74
75 /*
76  * Returns the active (!) output which contains the coordinates x, y or NULL
77  * if there is no output which contains these coordinates.
78  *
79  */
80 Output *get_output_containing(int x, int y) {
81         Output *output;
82         TAILQ_FOREACH(output, &outputs, outputs) {
83                 if (!output->active)
84                         continue;
85                 DLOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
86                                 x, y, output->rect.x, output->rect.y, output->rect.width, output->rect.height);
87                 if (x >= output->rect.x && x < (output->rect.x + output->rect.width) &&
88                     y >= output->rect.y && y < (output->rect.y + output->rect.height))
89                         return output;
90         }
91
92         return NULL;
93 }
94
95 /*
96  * Gets the output which is the last one in the given direction, for example
97  * the output on the most bottom when direction == D_DOWN, the output most
98  * right when direction == D_RIGHT and so on.
99  *
100  * This function always returns a output.
101  *
102  */
103 Output *get_output_most(direction_t direction, Output *current) {
104         Output *output, *candidate = NULL;
105         int position = 0;
106         TAILQ_FOREACH(output, &outputs, outputs) {
107                 if (!output->active)
108                         continue;
109
110                 /* Repeated calls of WIN determine the winner of the comparison */
111                 #define WIN(variable, condition) \
112                         if (variable condition) { \
113                                 candidate = output; \
114                                 position = variable; \
115                         } \
116                         break;
117
118                 if (((direction == D_UP) || (direction == D_DOWN)) &&
119                     (current->rect.x != output->rect.x))
120                         continue;
121
122                 if (((direction == D_LEFT) || (direction == D_RIGHT)) &&
123                     (current->rect.y != output->rect.y))
124                         continue;
125
126                 switch (direction) {
127                         case D_UP:
128                                 WIN(output->rect.y, <= position);
129                         case D_DOWN:
130                                 WIN(output->rect.y, >= position);
131                         case D_LEFT:
132                                 WIN(output->rect.x, <= position);
133                         case D_RIGHT:
134                                 WIN(output->rect.x, >= position);
135                 }
136         }
137
138         assert(candidate != NULL);
139
140         return candidate;
141 }
142
143 #if 0
144 /*
145  * Initializes the specified output, assigning the specified workspace to it.
146  *
147  */
148 void initialize_output(xcb_connection_t *conn, Output *output, Workspace *workspace) {
149         i3Font *font = load_font(conn, config.font);
150
151         workspace->output = output;
152         output->current_workspace = workspace;
153
154         /* Copy rect for the workspace */
155         memcpy(&(workspace->rect), &(output->rect), sizeof(Rect));
156
157         /* Map clients on the workspace, if any */
158         workspace_map_clients(conn, workspace);
159
160         /* Create a bar window on each output */
161         if (!config.disable_workspace_bar) {
162                 Rect bar_rect = {output->rect.x,
163                                  output->rect.y + output->rect.height - (font->height + 6),
164                                  output->rect.x + output->rect.width,
165                                  font->height + 6};
166                 uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
167                 uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
168                 output->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
169                 output->bargc = xcb_generate_id(conn);
170                 xcb_create_gc(conn, output->bargc, output->bar, 0, 0);
171         }
172
173         SLIST_INIT(&(output->dock_clients));
174
175         ipc_send_event("workspace", I3_IPC_EVENT_WORKSPACE, "{\"change\":\"init\"}");
176         DLOG("initialized output at (%d, %d) with %d x %d\n",
177                         output->rect.x, output->rect.y, output->rect.width, output->rect.height);
178
179         DLOG("assigning configured workspaces to this output...\n");
180         Workspace *ws;
181         TAILQ_FOREACH(ws, workspaces, workspaces) {
182                 if (ws == workspace)
183                         continue;
184                 if (ws->preferred_output == NULL ||
185                     get_output_by_name(ws->preferred_output) != output)
186                         continue;
187
188                 DLOG("assigning ws %d\n", ws->num + 1);
189                 workspace_assign_to(ws, output, true);
190         }
191 }
192 #endif
193
194 /*
195  * Disables RandR support by creating exactly one output with the size of the
196  * X11 screen.
197  *
198  */
199 void disable_randr(xcb_connection_t *conn) {
200         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
201
202         DLOG("RandR extension unusable, disabling.\n");
203
204         Output *s = scalloc(sizeof(Output));
205
206         s->active = true;
207         s->rect.x = 0;
208         s->rect.y = 0;
209         s->rect.width = root_screen->width_in_pixels;
210         s->rect.height = root_screen->height_in_pixels;
211         s->name = "xroot-0";
212
213         TAILQ_INSERT_TAIL(&outputs, s, outputs);
214
215         randr_disabled = true;
216 }
217
218 /*
219  * This function needs to be called when changing the mode of an output when
220  * it already has some workspaces (or a bar window) assigned.
221  *
222  * It reconfigures the bar window for the new mode, copies the new rect into
223  * each workspace on this output and forces all windows on the affected
224  * workspaces to be reconfigured.
225  *
226  * It is necessary to call render_layout() afterwards.
227  *
228  */
229 static void output_change_mode(xcb_connection_t *conn, Output *output) {
230         i3Font *font = load_font(conn, config.font);
231
232         DLOG("Output mode changed, reconfiguring bar, updating workspaces\n");
233         Rect bar_rect = {output->rect.x,
234                          output->rect.y + output->rect.height - (font->height + 6),
235                          output->rect.x + output->rect.width,
236                          font->height + 6};
237
238         xcb_set_window_rect(conn, output->bar, bar_rect);
239
240 #if 0
241         /* go through all workspaces and set force_reconfigure */
242         TAILQ_FOREACH(ws, workspaces, workspaces) {
243                 if (ws->output != output)
244                         continue;
245
246                 SLIST_FOREACH(client, &(ws->focus_stack), focus_clients) {
247                         client->force_reconfigure = true;
248                         if (!client_is_floating(client))
249                                 continue;
250                         /* For floating clients we need to translate the
251                          * coordinates (old workspace to new workspace) */
252                         DLOG("old: (%x, %x)\n", client->rect.x, client->rect.y);
253                         client->rect.x -= ws->rect.x;
254                         client->rect.y -= ws->rect.y;
255                         client->rect.x += ws->output->rect.x;
256                         client->rect.y += ws->output->rect.y;
257                         DLOG("new: (%x, %x)\n", client->rect.x, client->rect.y);
258                 }
259
260                 /* Update dimensions from output */
261                 memcpy(&(ws->rect), &(ws->output->rect), sizeof(Rect));
262
263                 /* Update the dimensions of a fullscreen client, if any */
264                 if (ws->fullscreen_client != NULL) {
265                         DLOG("Updating fullscreen client size\n");
266                         client = ws->fullscreen_client;
267                         Rect r = ws->rect;
268                         xcb_set_window_rect(conn, client->frame, r);
269
270                         r.x = 0;
271                         r.y = 0;
272                         xcb_set_window_rect(conn, client->child, r);
273                 }
274         }
275 #endif
276 }
277
278 /*
279  * Gets called by randr_query_outputs() for each output. The function adds new
280  * outputs to the list of outputs, checks if the mode of existing outputs has
281  * been changed or if an existing output has been disabled. It will then change
282  * either the "changed" or the "to_be_deleted" flag of the output, if
283  * appropriate.
284  *
285  */
286 static void handle_output(xcb_connection_t *conn, xcb_randr_output_t id,
287                           xcb_randr_get_output_info_reply_t *output,
288                           xcb_timestamp_t cts, resources_reply *res) {
289         /* each CRT controller has a position in which we are interested in */
290         crtc_info *crtc;
291
292         Output *new = get_output_by_id(id);
293         bool existing = (new != NULL);
294         if (!existing)
295                 new = scalloc(sizeof(Output));
296         new->id = id;
297         FREE(new->name);
298         asprintf(&new->name, "%.*s",
299                         xcb_randr_get_output_info_name_length(output),
300                         xcb_randr_get_output_info_name(output));
301
302         DLOG("found output with name %s\n", new->name);
303
304         /* Even if no CRTC is used at the moment, we store the output so that
305          * we do not need to change the list ever again (we only update the
306          * position/size) */
307         if (output->crtc == XCB_NONE) {
308                 if (!existing)
309                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
310                 else if (new->active)
311                         new->to_be_disabled = true;
312                 return;
313         }
314
315         xcb_randr_get_crtc_info_cookie_t icookie;
316         icookie = xcb_randr_get_crtc_info(conn, output->crtc, cts);
317         if ((crtc = xcb_randr_get_crtc_info_reply(conn, icookie, NULL)) == NULL) {
318                 DLOG("Skipping output %s: could not get CRTC (%p)\n",
319                      new->name, crtc);
320                 free(new);
321                 return;
322         }
323
324         bool updated = update_if_necessary(&(new->rect.x), crtc->x) |
325                        update_if_necessary(&(new->rect.y), crtc->y) |
326                        update_if_necessary(&(new->rect.width), crtc->width) |
327                        update_if_necessary(&(new->rect.height), crtc->height);
328         free(crtc);
329         new->active = (new->rect.width != 0 && new->rect.height != 0);
330         if (!new->active) {
331                 DLOG("width/height 0/0, disabling output\n");
332                 return;
333         }
334
335         DLOG("mode: %dx%d+%d+%d\n", new->rect.width, new->rect.height,
336                                     new->rect.x, new->rect.y);
337
338         /* If we don’t need to change an existing output or if the output
339          * does not exist in the first place, the case is simple: we either
340          * need to insert the new output or we are done. */
341         if (!updated || !existing) {
342                 if (!existing)
343                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
344                 return;
345         }
346
347         new->changed = true;
348 }
349
350 /*
351  * (Re-)queries the outputs via RandR and stores them in the list of outputs.
352  *
353  */
354 void randr_query_outputs() {
355         Output *output, *other, *first;
356         xcb_randr_get_screen_resources_current_cookie_t rcookie;
357         resources_reply *res;
358         /* timestamp of the configuration so that we get consistent replies to all
359          * requests (if the configuration changes between our different calls) */
360         xcb_timestamp_t cts;
361
362         /* an output is VGA-1, LVDS-1, etc. (usually physical video outputs) */
363         xcb_randr_output_t *randr_outputs;
364
365         if (randr_disabled)
366                 return;
367
368         /* Get screen resources (crtcs, outputs, modes) */
369         rcookie = xcb_randr_get_screen_resources_current(conn, root);
370         if ((res = xcb_randr_get_screen_resources_current_reply(conn, rcookie, NULL)) == NULL) {
371                 disable_randr(conn);
372                 return;
373         }
374         cts = res->config_timestamp;
375
376         int len = xcb_randr_get_screen_resources_current_outputs_length(res);
377         randr_outputs = xcb_randr_get_screen_resources_current_outputs(res);
378
379         /* Request information for each output */
380         xcb_randr_get_output_info_cookie_t ocookie[len];
381         for (int i = 0; i < len; i++)
382                 ocookie[i] = xcb_randr_get_output_info(conn, randr_outputs[i], cts);
383
384         /* Loop through all outputs available for this X11 screen */
385         for (int i = 0; i < len; i++) {
386                 xcb_randr_get_output_info_reply_t *output;
387
388                 if ((output = xcb_randr_get_output_info_reply(conn, ocookie[i], NULL)) == NULL)
389                         continue;
390
391                 handle_output(conn, randr_outputs[i], output, cts, res);
392                 free(output);
393         }
394
395         free(res);
396         /* Check for clones, disable the clones and reduce the mode to the
397          * lowest common mode */
398         TAILQ_FOREACH(output, &outputs, outputs) {
399                 if (!output->active || output->to_be_disabled)
400                         continue;
401                 DLOG("output %p, position (%d, %d), checking for clones\n",
402                         output, output->rect.x, output->rect.y);
403
404                 for (other = output;
405                      other != TAILQ_END(&outputs);
406                      other = TAILQ_NEXT(other, outputs)) {
407                         if (other == output || !other->active || other->to_be_disabled)
408                                 continue;
409
410                         if (other->rect.x != output->rect.x ||
411                             other->rect.y != output->rect.y)
412                                 continue;
413
414                         DLOG("output %p has the same position, his mode = %d x %d\n",
415                                         other, other->rect.width, other->rect.height);
416                         uint32_t width = min(other->rect.width, output->rect.width);
417                         uint32_t height = min(other->rect.height, output->rect.height);
418
419                         if (update_if_necessary(&(output->rect.width), width) |
420                             update_if_necessary(&(output->rect.height), height))
421                                 output->changed = true;
422
423                         update_if_necessary(&(other->rect.width), width);
424                         update_if_necessary(&(other->rect.height), height);
425
426                         DLOG("disabling output %p (%s)\n", other, other->name);
427                         other->to_be_disabled = true;
428
429                         DLOG("new output mode %d x %d, other mode %d x %d\n",
430                                         output->rect.width, output->rect.height,
431                                         other->rect.width, other->rect.height);
432                 }
433         }
434
435         /* Handle outputs which have a new mode or are disabled now (either
436          * because the user disabled them or because they are clones) */
437         TAILQ_FOREACH(output, &outputs, outputs) {
438                 if (output->to_be_disabled) {
439                         output->active = false;
440                         DLOG("Output %s disabled, re-assigning workspaces/docks\n", output->name);
441
442                         if ((first = get_first_output()) == NULL)
443                                 die("No usable outputs available\n");
444
445                         //bool needs_init = (first->current_workspace == NULL);
446
447 #if 0
448                         TAILQ_FOREACH(ws, workspaces, workspaces) {
449                                 if (ws->output != output)
450                                         continue;
451
452                                 workspace_assign_to(ws, first, true);
453                                 if (!needs_init)
454                                         continue;
455                                 //initialize_output(conn, first, ws);
456                                 needs_init = false;
457                         }
458
459                         Client *dock;
460                         while (!SLIST_EMPTY(&(output->dock_clients))) {
461                                 dock = SLIST_FIRST(&(output->dock_clients));
462                                 SLIST_REMOVE_HEAD(&(output->dock_clients), dock_clients);
463                                 SLIST_INSERT_HEAD(&(first->dock_clients), dock, dock_clients);
464                         }
465
466 #endif
467                         //output->current_workspace = NULL;
468                         output->to_be_disabled = false;
469                 } else if (output->changed) {
470                         output_change_mode(conn, output);
471                         output->changed = false;
472                 }
473         }
474
475         if (TAILQ_EMPTY(&outputs)) {
476                 ELOG("No outputs found via RandR, disabling\n");
477                 disable_randr(conn);
478         }
479
480         //ewmh_update_workarea();
481
482 #if 0
483         /* Just go through each active output and associate one workspace */
484         TAILQ_FOREACH(output, &outputs, outputs) {
485                 if (!output->active || output->current_workspace != NULL)
486                         continue;
487                 ws = get_first_workspace_for_output(output);
488                 initialize_output(conn, output, ws);
489         }
490 #endif
491
492         /* render_layout flushes */
493         tree_render();
494 }
495
496 /*
497  * We have just established a connection to the X server and need the initial
498  * XRandR information to setup workspaces for each screen.
499  *
500  */
501 void randr_init(int *event_base) {
502         const xcb_query_extension_reply_t *extreply;
503
504         extreply = xcb_get_extension_data(conn, &xcb_randr_id);
505         if (!extreply->present)
506                 disable_randr(conn);
507         else randr_query_outputs(conn);
508
509         if (event_base != NULL)
510                 *event_base = extreply->first_event;
511
512         xcb_randr_select_input(conn, root,
513                 XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
514                 XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
515                 XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE |
516                 XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY);
517
518         xcb_flush(conn);
519 }