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