git.sur5r.net Git - i3/i3/blob - 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 <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <stdbool.h>
  19 #include <assert.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22
  23 #include <xcb/xcb.h>
  24 #include <xcb/randr.h>
  25
  26 #include "queue.h"
  27 #include "i3.h"
  28 #include "data.h"
  29 #include "table.h"
  30 #include "util.h"
  31 #include "layout.h"
  32 #include "xcb.h"
  33 #include "config.h"
  34 #include "workspace.h"
  35 #include "log.h"
  36 #include "ewmh.h"
  37
  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;
  43
  44 /* Stores all outputs available in your current session. */
  45 struct outputs_head outputs = TAILQ_HEAD_INITIALIZER(outputs);
  46
  47 /*
  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
  50  * re-scanning.
  51  *
  52  */
  53 static Output *get_output_by_id(xcb_randr_output_t id) {
  54         Output *output;
  55         TAILQ_FOREACH(output, &outputs, outputs)
  56                 if (output->id == id)
  57                         return output;
  58
  59         return NULL;
  60 }
  61
  62 /*
  63  * Returns the output with the given name if it is active (!) or NULL.
  64  *
  65  */
  66 Output *get_output_by_name(const char *name) {
  67         Output *output;
  68         TAILQ_FOREACH(output, &outputs, outputs)
  69                 if (output->active &&
  70                     strcasecmp(output->name, name) == 0)
  71                         return output;
  72
  73         return NULL;
  74 }
  75
  76 /*
  77  * Returns the first output which is active.
  78  *
  79  */
  80 Output *get_first_output() {
  81         Output *screen;
  82
  83         TAILQ_FOREACH(screen, &outputs, outputs) {
  84                 if (screen->active)
  85                         return screen;
  86         }
  87
  88         return NULL;
  89 }
  90
  91 /*
  92  * Looks in virtual_screens for the Output which contains coordinates x, y
  93  *
  94  */
  95 Output *get_screen_containing(int x, int y) {
  96         Output *screen;
  97         TAILQ_FOREACH(screen, &outputs, outputs) {
  98                 if (!screen->active)
  99                         continue;
 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))
 104                         return screen;
 105         }
 106
 107         return NULL;
 108 }
 109
 110 /*
 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
 113  * and so on.
 114  *
 115  * This function always returns a screen.
 116  *
 117  */
 118 Output *get_screen_most(direction_t direction, Output *current) {
 119         Output *screen, *candidate = NULL;
 120         int position = 0;
 121         TAILQ_FOREACH(screen, &outputs, outputs) {
 122                 if (!screen->active)
 123                         continue;
 124
 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; \
 130                         } \
 131                         break;
 132
 133                 if (((direction == D_UP) || (direction == D_DOWN)) &&
 134                     (current->rect.x != screen->rect.x))
 135                         continue;
 136
 137                 if (((direction == D_LEFT) || (direction == D_RIGHT)) &&
 138                     (current->rect.y != screen->rect.y))
 139                         continue;
 140
 141                 switch (direction) {
 142                         case D_UP:
 143                                 WIN(screen->rect.y, <= position);
 144                         case D_DOWN:
 145                                 WIN(screen->rect.y, >= position);
 146                         case D_LEFT:
 147                                 WIN(screen->rect.x, <= position);
 148                         case D_RIGHT:
 149                                 WIN(screen->rect.x, >= position);
 150                 }
 151         }
 152
 153         assert(candidate != NULL);
 154
 155         return candidate;
 156 }
 157
 158 static void initialize_output(xcb_connection_t *conn, Output *output,
 159                               Workspace *workspace) {
 160         i3Font *font = load_font(conn, config.font);
 161
 162         workspace->output = output;
 163         output->current_workspace = workspace;
 164
 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,
 169                          font->height + 6};
 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);
 175
 176         SLIST_INIT(&(output->dock_clients));
 177
 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);
 180 }
 181
 182 /*
 183  * Fills virtual_screens with exactly one screen with width/height of the
 184  * whole X screen.
 185  *
 186  */
 187 static void disable_randr(xcb_connection_t *conn) {
 188         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
 189
 190         DLOG("RandR extension not found, disabling.\n");
 191
 192         Output *s = scalloc(sizeof(Output));
 193
 194         s->active = true;
 195         s->rect.x = 0;
 196         s->rect.y = 0;
 197         s->rect.width = root_screen->width_in_pixels;
 198         s->rect.height = root_screen->height_in_pixels;
 199
 200         TAILQ_INSERT_TAIL(&outputs, s, outputs);
 201 }
 202
 203 /*
 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).
 206  *
 207  */
 208 static mode_info *get_mode_by_id(resources_reply *reply, xcb_randr_mode_t mode) {
 209         xcb_randr_mode_info_iterator_t it;
 210
 211         for (it = xcb_randr_get_screen_resources_current_modes_iterator(reply);
 212                 it.rem > 0;
 213                 xcb_randr_mode_info_next(&it)) {
 214                 if (it.data->id == mode)
 215                         return it.data;
 216         }
 217
 218         return NULL;
 219 }
 220
 221 /*
 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.
 224  *
 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.
 228  *
 229  * It is necessary to call render_layout() afterwards.
 230  *
 231  */
 232 static void output_change_mode(xcb_connection_t *conn, Output *output) {
 233         i3Font *font = load_font(conn, config.font);
 234         Workspace *ws;
 235         Client *client;
 236
 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,
 241                          font->height + 6};
 242
 243         xcb_set_window_rect(conn, output->bar, bar_rect);
 244
 245         /* go through all workspaces and set force_reconfigure */
 246         TAILQ_FOREACH(ws, workspaces, workspaces) {
 247                 if (ws->output != output)
 248                         continue;
 249
 250                 /* Update dimensions from output */
 251                 memcpy(&(ws->rect), &(ws->output->rect), sizeof(Rect));
 252
 253                 SLIST_FOREACH(client, &(ws->focus_stack), focus_clients)
 254                         client->force_reconfigure = true;
 255
 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;
 260                         Rect r = ws->rect;
 261                         xcb_set_window_rect(conn, client->frame, r);
 262
 263                         r.x = 0;
 264                         r.y = 0;
 265                         xcb_set_window_rect(conn, client->child, r);
 266                 }
 267         }
 268 }
 269
 270 /*
 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
 275  * appropriate.
 276  *
 277  */
 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 */
 282         crtc_info *crtc;
 283
 284         /* the CRTC runs in a specific mode, while the position is stored in
 285          * the output itself */
 286         mode_info *mode;
 287
 288         Output *new = get_output_by_id(id);
 289         bool existing = (new != NULL);
 290         if (!existing)
 291                 new = scalloc(sizeof(Output));
 292         new->id = id;
 293         asprintf(&new->name, "%.*s",
 294                         xcb_randr_get_output_info_name_length(output),
 295                         xcb_randr_get_output_info_name(output));
 296
 297         DLOG("found output with name %s\n", new->name);
 298
 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
 301          * position/size) */
 302         if (output->crtc == XCB_NONE) {
 303                 if (!existing)
 304                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 305                 else if (new->active) {
 306                         new->to_be_disabled = true;
 307
 308                 }
 309                 free(output);
 310                 return;
 311         }
 312
 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);
 319                 free(new);
 320                 free(output);
 321                 return;
 322         }
 323
 324         new->active = true;
 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);
 329
 330         DLOG("mode: %dx%d+%d+%d\n", new->rect.width, new->rect.height,
 331                                     new->rect.x, new->rect.y);
 332
 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) {
 337                 if (!existing)
 338                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 339                 free(output);
 340                 return;
 341         }
 342
 343         new->changed = true;
 344 }
 345
 346 /*
 347  * (Re-)queries the outputs via RandR and stores them in the list of outputs.
 348  *
 349  */
 350 void randr_query_screens(xcb_connection_t *conn) {
 351         Workspace *ws;
 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) */
 356         xcb_timestamp_t cts;
 357
 358         /* an output is VGA-1, LVDS-1, etc. (usually physical video outputs) */
 359         xcb_randr_output_t *randr_outputs;
 360
 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;
 366
 367         int len = xcb_randr_get_screen_resources_current_outputs_length(res);
 368         randr_outputs = xcb_randr_get_screen_resources_current_outputs(res);
 369
 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);
 374
 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;
 378
 379                 if ((output = xcb_randr_get_output_info_reply(conn, ocookie[i], NULL)) == NULL)
 380                         continue;
 381
 382                 handle_output(conn, randr_outputs[i], output, cts, res);
 383         }
 384
 385         free(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)
 390                         continue;
 391                 DLOG("screen %p, position (%d, %d), checking for clones\n",
 392                         screen, screen->rect.x, screen->rect.y);
 393
 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)
 398                                 continue;
 399
 400                         if (oscreen->rect.x != screen->rect.x ||
 401                             oscreen->rect.y != screen->rect.y)
 402                                 continue;
 403
 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);
 408
 409                         if (update_if_necessary(&(screen->rect.width), width) |
 410                             update_if_necessary(&(screen->rect.height), height))
 411                                 screen->changed = true;
 412
 413                         update_if_necessary(&(oscreen->rect.width), width);
 414                         update_if_necessary(&(oscreen->rect.height), height);
 415
 416                         DLOG("disabling screen %p (%s)\n", oscreen, oscreen->name);
 417                         oscreen->to_be_disabled = true;
 418
 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);
 422                 }
 423         }
 424
 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);
 430
 431                         if ((first = get_first_output()) == NULL)
 432                                 die("No usable outputs available\n");
 433
 434                         bool needs_init = (first->current_workspace == NULL);
 435
 436                         TAILQ_FOREACH(ws, workspaces, workspaces) {
 437                                 if (ws->output != output)
 438                                         continue;
 439
 440                                 workspace_assign_to(ws, first);
 441                                 if (!needs_init)
 442                                         continue;
 443                                 initialize_output(conn, first, ws);
 444                                 needs_init = false;
 445                         }
 446
 447                         Client *dock;
 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);
 452                         }
 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;
 458                 }
 459         }
 460
 461         ewmh_update_workarea();
 462
 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)
 466                         continue;
 467                 ws = get_first_workspace_for_screen(screen);
 468                 initialize_output(conn, screen, ws);
 469         }
 470
 471         /* render_layout flushes */
 472         render_layout(conn);
 473 }
 474
 475 /*
 476  * We have just established a connection to the X server and need the initial
 477  * XRandR information to setup workspaces for each screen.
 478  *
 479  */
 480 void initialize_randr(xcb_connection_t *conn, int *event_base) {
 481         const xcb_query_extension_reply_t *extreply;
 482
 483         extreply = xcb_get_extension_data(conn, &xcb_randr_id);
 484         if (!extreply->present)
 485                 disable_randr(conn);
 486         else randr_query_screens(conn);
 487
 488         if (event_base != NULL)
 489                 *event_base = extreply->first_event;
 490
 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);
 496
 497         xcb_flush(conn);
 498 }