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