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 #include "ipc.h"
  38 #include "client.h"
  39
  40 /* While a clean namespace is usually a pretty good thing, we really need
  41  * to use shorter names than the whole xcb_randr_* default names. */
  42 typedef xcb_randr_get_crtc_info_reply_t crtc_info;
  43 typedef xcb_randr_mode_info_t mode_info;
  44 typedef xcb_randr_get_screen_resources_current_reply_t resources_reply;
  45
  46 /* Stores all outputs available in your current session. */
  47 struct outputs_head outputs = TAILQ_HEAD_INITIALIZER(outputs);
  48
  49 static bool randr_disabled = false;
  50
  51 /*
  52  * Get a specific output by its internal X11 id. Used by randr_query_outputs
  53  * to check if the output is new (only in the first scan) or if we are
  54  * re-scanning.
  55  *
  56  */
  57 static Output *get_output_by_id(xcb_randr_output_t id) {
  58         Output *output;
  59         TAILQ_FOREACH(output, &outputs, outputs)
  60                 if (output->id == id)
  61                         return output;
  62
  63         return NULL;
  64 }
  65
  66 /*
  67  * Returns the output with the given name if it is active (!) or NULL.
  68  *
  69  */
  70 Output *get_output_by_name(const char *name) {
  71         Output *output;
  72         TAILQ_FOREACH(output, &outputs, outputs)
  73                 if (output->active &&
  74                     strcasecmp(output->name, name) == 0)
  75                         return output;
  76
  77         return NULL;
  78 }
  79
  80 /*
  81  * Returns the first output which is active.
  82  *
  83  */
  84 Output *get_first_output() {
  85         Output *output;
  86
  87         TAILQ_FOREACH(output, &outputs, outputs)
  88                 if (output->active)
  89                         return output;
  90
  91         return NULL;
  92 }
  93
  94 /*
  95  * Returns the active (!) output which contains the coordinates x, y or NULL
  96  * if there is no output which contains these coordinates.
  97  *
  98  */
  99 Output *get_output_containing(int x, int y) {
 100         Output *output;
 101         TAILQ_FOREACH(output, &outputs, outputs) {
 102                 if (!output->active)
 103                         continue;
 104                 DLOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
 105                                 x, y, output->rect.x, output->rect.y, output->rect.width, output->rect.height);
 106                 if (x >= output->rect.x && x < (output->rect.x + output->rect.width) &&
 107                     y >= output->rect.y && y < (output->rect.y + output->rect.height))
 108                         return output;
 109         }
 110
 111         return NULL;
 112 }
 113
 114 /*
 115  * Gets the output which is the last one in the given direction, for example
 116  * the output on the most bottom when direction == D_DOWN, the output most
 117  * right when direction == D_RIGHT and so on.
 118  *
 119  * This function always returns a output.
 120  *
 121  */
 122 Output *get_output_most(direction_t direction, Output *current) {
 123         Output *output, *candidate = NULL;
 124         int position = 0;
 125         TAILQ_FOREACH(output, &outputs, outputs) {
 126                 if (!output->active)
 127                         continue;
 128
 129                 /* Repeated calls of WIN determine the winner of the comparison */
 130                 #define WIN(variable, condition) \
 131                         if (variable condition) { \
 132                                 candidate = output; \
 133                                 position = variable; \
 134                         } \
 135                         break;
 136
 137                 if (((direction == D_UP) || (direction == D_DOWN)) &&
 138                     (current->rect.x != output->rect.x))
 139                         continue;
 140
 141                 if (((direction == D_LEFT) || (direction == D_RIGHT)) &&
 142                     (current->rect.y != output->rect.y))
 143                         continue;
 144
 145                 switch (direction) {
 146                         case D_UP:
 147                                 WIN(output->rect.y, <= position);
 148                         case D_DOWN:
 149                                 WIN(output->rect.y, >= position);
 150                         case D_LEFT:
 151                                 WIN(output->rect.x, <= position);
 152                         case D_RIGHT:
 153                                 WIN(output->rect.x, >= position);
 154                 }
 155         }
 156
 157         assert(candidate != NULL);
 158
 159         return candidate;
 160 }
 161
 162 /*
 163  * Initializes the specified output, assigning the specified workspace to it.
 164  *
 165  */
 166 void initialize_output(xcb_connection_t *conn, Output *output, Workspace *workspace) {
 167         i3Font *font = load_font(conn, config.font);
 168
 169         workspace->output = output;
 170         output->current_workspace = workspace;
 171
 172         /* Copy rect for the workspace */
 173         memcpy(&(workspace->rect), &(output->rect), sizeof(Rect));
 174
 175         /* Map clients on the workspace, if any */
 176         workspace_map_clients(conn, workspace);
 177
 178         /* Create a bar window on each output */
 179         if (!config.disable_workspace_bar) {
 180                 Rect bar_rect = {output->rect.x,
 181                                  output->rect.y + output->rect.height - (font->height + 6),
 182                                  output->rect.x + output->rect.width,
 183                                  font->height + 6};
 184                 uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 185                 uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
 186                 output->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
 187                 output->bargc = xcb_generate_id(conn);
 188                 xcb_create_gc(conn, output->bargc, output->bar, 0, 0);
 189         }
 190
 191         SLIST_INIT(&(output->dock_clients));
 192
 193         ipc_send_event("workspace", I3_IPC_EVENT_WORKSPACE, "{\"change\":\"init\"}");
 194         DLOG("initialized output at (%d, %d) with %d x %d\n",
 195                         output->rect.x, output->rect.y, output->rect.width, output->rect.height);
 196
 197         DLOG("assigning configured workspaces to this output...\n");
 198         Workspace *ws;
 199         TAILQ_FOREACH(ws, workspaces, workspaces) {
 200                 if (ws == workspace)
 201                         continue;
 202                 if (ws->preferred_output == NULL ||
 203                     get_output_by_name(ws->preferred_output) != output)
 204                         continue;
 205
 206                 DLOG("assigning ws %d\n", ws->num + 1);
 207                 workspace_assign_to(ws, output, true);
 208         }
 209 }
 210
 211 /*
 212  * Disables RandR support by creating exactly one output with the size of the
 213  * X11 screen.
 214  *
 215  */
 216 void disable_randr(xcb_connection_t *conn) {
 217         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
 218
 219         DLOG("RandR extension unusable, disabling.\n");
 220
 221         Output *s = scalloc(sizeof(Output));
 222
 223         s->active = true;
 224         s->rect.x = 0;
 225         s->rect.y = 0;
 226         s->rect.width = root_screen->width_in_pixels;
 227         s->rect.height = root_screen->height_in_pixels;
 228         s->name = "xroot-0";
 229
 230         TAILQ_INSERT_TAIL(&outputs, s, outputs);
 231
 232         randr_disabled = true;
 233 }
 234
 235 /*
 236  * This function needs to be called when changing the mode of an output when
 237  * it already has some workspaces (or a bar window) assigned.
 238  *
 239  * It reconfigures the bar window for the new mode, copies the new rect into
 240  * each workspace on this output and forces all windows on the affected
 241  * workspaces to be reconfigured.
 242  *
 243  * It is necessary to call render_layout() afterwards.
 244  *
 245  */
 246 static void output_change_mode(xcb_connection_t *conn, Output *output) {
 247         i3Font *font = load_font(conn, config.font);
 248         Workspace *ws;
 249         Client *client;
 250
 251         DLOG("Output mode changed, reconfiguring bar, updating workspaces\n");
 252         Rect bar_rect = {output->rect.x,
 253                          output->rect.y + output->rect.height - (font->height + 6),
 254                          output->rect.x + output->rect.width,
 255                          font->height + 6};
 256
 257         xcb_set_window_rect(conn, output->bar, bar_rect);
 258
 259         /* go through all workspaces and set force_reconfigure */
 260         TAILQ_FOREACH(ws, workspaces, workspaces) {
 261                 if (ws->output != output)
 262                         continue;
 263
 264                 SLIST_FOREACH(client, &(ws->focus_stack), focus_clients) {
 265                         client->force_reconfigure = true;
 266                         if (!client_is_floating(client))
 267                                 continue;
 268                         /* For floating clients we need to translate the
 269                          * coordinates (old workspace to new workspace) */
 270                         DLOG("old: (%x, %x)\n", client->rect.x, client->rect.y);
 271                         client->rect.x -= ws->rect.x;
 272                         client->rect.y -= ws->rect.y;
 273                         client->rect.x += ws->output->rect.x;
 274                         client->rect.y += ws->output->rect.y;
 275                         DLOG("new: (%x, %x)\n", client->rect.x, client->rect.y);
 276                 }
 277
 278                 /* Update dimensions from output */
 279                 memcpy(&(ws->rect), &(ws->output->rect), sizeof(Rect));
 280
 281                 /* Update the dimensions of a fullscreen client, if any */
 282                 if (ws->fullscreen_client != NULL) {
 283                         DLOG("Updating fullscreen client size\n");
 284                         client = ws->fullscreen_client;
 285                         Rect r = ws->rect;
 286                         xcb_set_window_rect(conn, client->frame, r);
 287
 288                         r.x = 0;
 289                         r.y = 0;
 290                         xcb_set_window_rect(conn, client->child, r);
 291                 }
 292         }
 293 }
 294
 295 /*
 296  * Gets called by randr_query_outputs() for each output. The function adds new
 297  * outputs to the list of outputs, checks if the mode of existing outputs has
 298  * been changed or if an existing output has been disabled. It will then change
 299  * either the "changed" or the "to_be_deleted" flag of the output, if
 300  * appropriate.
 301  *
 302  */
 303 static void handle_output(xcb_connection_t *conn, xcb_randr_output_t id,
 304                           xcb_randr_get_output_info_reply_t *output,
 305                           xcb_timestamp_t cts, resources_reply *res) {
 306         /* each CRT controller has a position in which we are interested in */
 307         crtc_info *crtc;
 308
 309         Output *new = get_output_by_id(id);
 310         bool existing = (new != NULL);
 311         if (!existing)
 312                 new = scalloc(sizeof(Output));
 313         new->id = id;
 314         asprintf(&new->name, "%.*s",
 315                         xcb_randr_get_output_info_name_length(output),
 316                         xcb_randr_get_output_info_name(output));
 317
 318         DLOG("found output with name %s\n", new->name);
 319
 320         /* Even if no CRTC is used at the moment, we store the output so that
 321          * we do not need to change the list ever again (we only update the
 322          * position/size) */
 323         if (output->crtc == XCB_NONE) {
 324                 if (!existing)
 325                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 326                 else if (new->active) {
 327                         new->to_be_disabled = true;
 328
 329                 }
 330                 free(output);
 331                 return;
 332         }
 333
 334         xcb_randr_get_crtc_info_cookie_t icookie;
 335         icookie = xcb_randr_get_crtc_info(conn, output->crtc, cts);
 336         if ((crtc = xcb_randr_get_crtc_info_reply(conn, icookie, NULL)) == NULL) {
 337                 DLOG("Skipping output %s: could not get CRTC (%p)\n",
 338                      new->name, crtc);
 339                 free(new);
 340                 free(output);
 341                 return;
 342         }
 343
 344         new->active = true;
 345         bool updated = update_if_necessary(&(new->rect.x), crtc->x) |
 346                        update_if_necessary(&(new->rect.y), crtc->y) |
 347                        update_if_necessary(&(new->rect.width), crtc->width) |
 348                        update_if_necessary(&(new->rect.height), crtc->height);
 349
 350         DLOG("mode: %dx%d+%d+%d\n", new->rect.width, new->rect.height,
 351                                     new->rect.x, new->rect.y);
 352
 353         /* If we don’t need to change an existing output or if the output
 354          * does not exist in the first place, the case is simple: we either
 355          * need to insert the new output or we are done. */
 356         if (!updated || !existing) {
 357                 if (!existing)
 358                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 359                 free(output);
 360                 return;
 361         }
 362
 363         new->changed = true;
 364 }
 365
 366 /*
 367  * (Re-)queries the outputs via RandR and stores them in the list of outputs.
 368  *
 369  */
 370 void randr_query_outputs(xcb_connection_t *conn) {
 371         Workspace *ws;
 372         Output *output, *other, *first;
 373         xcb_randr_get_screen_resources_current_cookie_t rcookie;
 374         resources_reply *res;
 375         /* timestamp of the configuration so that we get consistent replies to all
 376          * requests (if the configuration changes between our different calls) */
 377         xcb_timestamp_t cts;
 378
 379         /* an output is VGA-1, LVDS-1, etc. (usually physical video outputs) */
 380         xcb_randr_output_t *randr_outputs;
 381
 382         if (randr_disabled)
 383                 return;
 384
 385         /* Get screen resources (crtcs, outputs, modes) */
 386         rcookie = xcb_randr_get_screen_resources_current(conn, root);
 387         if ((res = xcb_randr_get_screen_resources_current_reply(conn, rcookie, NULL)) == NULL) {
 388                 disable_randr(conn);
 389                 return;
 390         }
 391         cts = res->config_timestamp;
 392
 393         int len = xcb_randr_get_screen_resources_current_outputs_length(res);
 394         randr_outputs = xcb_randr_get_screen_resources_current_outputs(res);
 395
 396         /* Request information for each output */
 397         xcb_randr_get_output_info_cookie_t ocookie[len];
 398         for (int i = 0; i < len; i++)
 399                 ocookie[i] = xcb_randr_get_output_info(conn, randr_outputs[i], cts);
 400
 401         /* Loop through all outputs available for this X11 screen */
 402         for (int i = 0; i < len; i++) {
 403                 xcb_randr_get_output_info_reply_t *output;
 404
 405                 if ((output = xcb_randr_get_output_info_reply(conn, ocookie[i], NULL)) == NULL)
 406                         continue;
 407
 408                 handle_output(conn, randr_outputs[i], output, cts, res);
 409         }
 410
 411         free(res);
 412         /* Check for clones, disable the clones and reduce the mode to the
 413          * lowest common mode */
 414         TAILQ_FOREACH(output, &outputs, outputs) {
 415                 if (!output->active || output->to_be_disabled)
 416                         continue;
 417                 DLOG("output %p, position (%d, %d), checking for clones\n",
 418                         output, output->rect.x, output->rect.y);
 419
 420                 for (other = output;
 421                      other != TAILQ_END(&outputs);
 422                      other = TAILQ_NEXT(other, outputs)) {
 423                         if (other == output || !other->active || other->to_be_disabled)
 424                                 continue;
 425
 426                         if (other->rect.x != output->rect.x ||
 427                             other->rect.y != output->rect.y)
 428                                 continue;
 429
 430                         DLOG("output %p has the same position, his mode = %d x %d\n",
 431                                         other, other->rect.width, other->rect.height);
 432                         uint32_t width = min(other->rect.width, output->rect.width);
 433                         uint32_t height = min(other->rect.height, output->rect.height);
 434
 435                         if (update_if_necessary(&(output->rect.width), width) |
 436                             update_if_necessary(&(output->rect.height), height))
 437                                 output->changed = true;
 438
 439                         update_if_necessary(&(other->rect.width), width);
 440                         update_if_necessary(&(other->rect.height), height);
 441
 442                         DLOG("disabling output %p (%s)\n", other, other->name);
 443                         other->to_be_disabled = true;
 444
 445                         DLOG("new output mode %d x %d, other mode %d x %d\n",
 446                                         output->rect.width, output->rect.height,
 447                                         other->rect.width, other->rect.height);
 448                 }
 449         }
 450
 451         /* Handle outputs which have a new mode or are disabled now (either
 452          * because the user disabled them or because they are clones) */
 453         TAILQ_FOREACH(output, &outputs, outputs) {
 454                 if (output->to_be_disabled) {
 455                         output->active = false;
 456                         DLOG("Output %s disabled, re-assigning workspaces/docks\n", output->name);
 457
 458                         if ((first = get_first_output()) == NULL)
 459                                 die("No usable outputs available\n");
 460
 461                         bool needs_init = (first->current_workspace == NULL);
 462
 463                         TAILQ_FOREACH(ws, workspaces, workspaces) {
 464                                 if (ws->output != output)
 465                                         continue;
 466
 467                                 workspace_assign_to(ws, first, true);
 468                                 if (!needs_init)
 469                                         continue;
 470                                 initialize_output(conn, first, ws);
 471                                 needs_init = false;
 472                         }
 473
 474                         Client *dock;
 475                         while (!SLIST_EMPTY(&(output->dock_clients))) {
 476                                 dock = SLIST_FIRST(&(output->dock_clients));
 477                                 SLIST_REMOVE_HEAD(&(output->dock_clients), dock_clients);
 478                                 SLIST_INSERT_HEAD(&(first->dock_clients), dock, dock_clients);
 479                         }
 480                         output->current_workspace = NULL;
 481                         output->to_be_disabled = false;
 482                 } else if (output->changed) {
 483                         output_change_mode(conn, output);
 484                         output->changed = false;
 485                 }
 486         }
 487
 488         if (TAILQ_EMPTY(&outputs)) {
 489                 ELOG("No outputs found via RandR, disabling\n");
 490                 disable_randr(conn);
 491         }
 492
 493         ewmh_update_workarea();
 494
 495         /* Just go through each active output and associate one workspace */
 496         TAILQ_FOREACH(output, &outputs, outputs) {
 497                 if (!output->active || output->current_workspace != NULL)
 498                         continue;
 499                 ws = get_first_workspace_for_output(output);
 500                 initialize_output(conn, output, ws);
 501         }
 502
 503         /* render_layout flushes */
 504         render_layout(conn);
 505 }
 506
 507 /*
 508  * We have just established a connection to the X server and need the initial
 509  * XRandR information to setup workspaces for each screen.
 510  *
 511  */
 512 void initialize_randr(xcb_connection_t *conn, int *event_base) {
 513         const xcb_query_extension_reply_t *extreply;
 514
 515         extreply = xcb_get_extension_data(conn, &xcb_randr_id);
 516         if (!extreply->present)
 517                 disable_randr(conn);
 518         else randr_query_outputs(conn);
 519
 520         if (event_base != NULL)
 521                 *event_base = extreply->first_event;
 522
 523         xcb_randr_select_input(conn, root,
 524                 XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
 525                 XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
 526                 XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE |
 527                 XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY);
 528
 529         xcb_flush(conn);
 530 }