git.sur5r.net Git - i3/i3/blob - src/randr.c

   1 /*
   2  * vim:ts=4:sw=4: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 }