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  * 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         Workspace *ws;
 232         Client *client;
 233
 234         DLOG("Output mode changed, reconfiguring bar, updating workspaces\n");
 235         Rect bar_rect = {output->rect.x,
 236                          output->rect.y + output->rect.height - (font->height + 6),
 237                          output->rect.x + output->rect.width,
 238                          font->height + 6};
 239
 240         xcb_set_window_rect(conn, output->bar, bar_rect);
 241
 242         /* go through all workspaces and set force_reconfigure */
 243         TAILQ_FOREACH(ws, workspaces, workspaces) {
 244                 if (ws->output != output)
 245                         continue;
 246
 247                 /* Update dimensions from output */
 248                 memcpy(&(ws->rect), &(ws->output->rect), sizeof(Rect));
 249
 250                 SLIST_FOREACH(client, &(ws->focus_stack), focus_clients)
 251                         client->force_reconfigure = true;
 252
 253                 /* Update the dimensions of a fullscreen client, if any */
 254                 if (ws->fullscreen_client != NULL) {
 255                         DLOG("Updating fullscreen client size\n");
 256                         client = ws->fullscreen_client;
 257                         Rect r = ws->rect;
 258                         xcb_set_window_rect(conn, client->frame, r);
 259
 260                         r.x = 0;
 261                         r.y = 0;
 262                         xcb_set_window_rect(conn, client->child, r);
 263                 }
 264         }
 265 }
 266
 267 /*
 268  * Gets called by randr_query_outputs() for each output. The function adds new
 269  * outputs to the list of outputs, checks if the mode of existing outputs has
 270  * been changed or if an existing output has been disabled. It will then change
 271  * either the "changed" or the "to_be_deleted" flag of the output, if
 272  * appropriate.
 273  *
 274  */
 275 static void handle_output(xcb_connection_t *conn, xcb_randr_output_t id,
 276                           xcb_randr_get_output_info_reply_t *output,
 277                           xcb_timestamp_t cts, resources_reply *res) {
 278         /* each CRT controller has a position in which we are interested in */
 279         crtc_info *crtc;
 280
 281         Output *new = get_output_by_id(id);
 282         bool existing = (new != NULL);
 283         if (!existing)
 284                 new = scalloc(sizeof(Output));
 285         new->id = id;
 286         asprintf(&new->name, "%.*s",
 287                         xcb_randr_get_output_info_name_length(output),
 288                         xcb_randr_get_output_info_name(output));
 289
 290         DLOG("found output with name %s\n", new->name);
 291
 292         /* Even if no CRTC is used at the moment, we store the output so that
 293          * we do not need to change the list ever again (we only update the
 294          * position/size) */
 295         if (output->crtc == XCB_NONE) {
 296                 if (!existing)
 297                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 298                 else if (new->active) {
 299                         new->to_be_disabled = true;
 300
 301                 }
 302                 free(output);
 303                 return;
 304         }
 305
 306         xcb_randr_get_crtc_info_cookie_t icookie;
 307         icookie = xcb_randr_get_crtc_info(conn, output->crtc, cts);
 308         if ((crtc = xcb_randr_get_crtc_info_reply(conn, icookie, NULL)) == NULL) {
 309                 DLOG("Skipping output %s: could not get CRTC (%p)\n",
 310                      new->name, crtc);
 311                 free(new);
 312                 free(output);
 313                 return;
 314         }
 315
 316         new->active = true;
 317         bool updated = update_if_necessary(&(new->rect.x), crtc->x) |
 318                        update_if_necessary(&(new->rect.y), crtc->y) |
 319                        update_if_necessary(&(new->rect.width), crtc->width) |
 320                        update_if_necessary(&(new->rect.height), crtc->height);
 321
 322         DLOG("mode: %dx%d+%d+%d\n", new->rect.width, new->rect.height,
 323                                     new->rect.x, new->rect.y);
 324
 325         /* If we don’t need to change an existing output or if the output
 326          * does not exist in the first place, the case is simple: we either
 327          * need to insert the new output or we are done. */
 328         if (!updated || !existing) {
 329                 if (!existing)
 330                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 331                 free(output);
 332                 return;
 333         }
 334
 335         new->changed = true;
 336 }
 337
 338 /*
 339  * (Re-)queries the outputs via RandR and stores them in the list of outputs.
 340  *
 341  */
 342 void randr_query_outputs(xcb_connection_t *conn) {
 343         Workspace *ws;
 344         Output *output, *other, *first;
 345         xcb_randr_get_screen_resources_current_cookie_t rcookie;
 346         resources_reply *res;
 347         /* timestamp of the configuration so that we get consistent replies to all
 348          * requests (if the configuration changes between our different calls) */
 349         xcb_timestamp_t cts;
 350
 351         /* an output is VGA-1, LVDS-1, etc. (usually physical video outputs) */
 352         xcb_randr_output_t *randr_outputs;
 353
 354         if (randr_disabled)
 355                 return;
 356
 357         /* Get screen resources (crtcs, outputs, modes) */
 358         rcookie = xcb_randr_get_screen_resources_current(conn, root);
 359         if ((res = xcb_randr_get_screen_resources_current_reply(conn, rcookie, NULL)) == NULL) {
 360                 disable_randr(conn);
 361                 return;
 362         }
 363         cts = res->config_timestamp;
 364
 365         int len = xcb_randr_get_screen_resources_current_outputs_length(res);
 366         randr_outputs = xcb_randr_get_screen_resources_current_outputs(res);
 367
 368         /* Request information for each output */
 369         xcb_randr_get_output_info_cookie_t ocookie[len];
 370         for (int i = 0; i < len; i++)
 371                 ocookie[i] = xcb_randr_get_output_info(conn, randr_outputs[i], cts);
 372
 373         /* Loop through all outputs available for this X11 screen */
 374         for (int i = 0; i < len; i++) {
 375                 xcb_randr_get_output_info_reply_t *output;
 376
 377                 if ((output = xcb_randr_get_output_info_reply(conn, ocookie[i], NULL)) == NULL)
 378                         continue;
 379
 380                 handle_output(conn, randr_outputs[i], output, cts, res);
 381         }
 382
 383         free(res);
 384         /* Check for clones, disable the clones and reduce the mode to the
 385          * lowest common mode */
 386         TAILQ_FOREACH(output, &outputs, outputs) {
 387                 if (!output->active || output->to_be_disabled)
 388                         continue;
 389                 DLOG("output %p, position (%d, %d), checking for clones\n",
 390                         output, output->rect.x, output->rect.y);
 391
 392                 for (other = output;
 393                      other != TAILQ_END(&outputs);
 394                      other = TAILQ_NEXT(other, outputs)) {
 395                         if (other == output || !other->active || other->to_be_disabled)
 396                                 continue;
 397
 398                         if (other->rect.x != output->rect.x ||
 399                             other->rect.y != output->rect.y)
 400                                 continue;
 401
 402                         DLOG("output %p has the same position, his mode = %d x %d\n",
 403                                         other, other->rect.width, other->rect.height);
 404                         uint32_t width = min(other->rect.width, output->rect.width);
 405                         uint32_t height = min(other->rect.height, output->rect.height);
 406
 407                         if (update_if_necessary(&(output->rect.width), width) |
 408                             update_if_necessary(&(output->rect.height), height))
 409                                 output->changed = true;
 410
 411                         update_if_necessary(&(other->rect.width), width);
 412                         update_if_necessary(&(other->rect.height), height);
 413
 414                         DLOG("disabling output %p (%s)\n", other, other->name);
 415                         other->to_be_disabled = true;
 416
 417                         DLOG("new output mode %d x %d, other mode %d x %d\n",
 418                                         output->rect.width, output->rect.height,
 419                                         other->rect.width, other->rect.height);
 420                 }
 421         }
 422
 423         /* Handle outputs which have a new mode or are disabled now (either
 424          * because the user disabled them or because they are clones) */
 425         TAILQ_FOREACH(output, &outputs, outputs) {
 426                 if (output->to_be_disabled) {
 427                         output->active = false;
 428                         DLOG("Output %s disabled, re-assigning workspaces/docks\n", output->name);
 429
 430                         if ((first = get_first_output()) == NULL)
 431                                 die("No usable outputs available\n");
 432
 433                         bool needs_init = (first->current_workspace == NULL);
 434
 435                         TAILQ_FOREACH(ws, workspaces, workspaces) {
 436                                 if (ws->output != output)
 437                                         continue;
 438
 439                                 workspace_assign_to(ws, first, true);
 440                                 if (!needs_init)
 441                                         continue;
 442                                 initialize_output(conn, first, ws);
 443                                 needs_init = false;
 444                         }
 445
 446                         Client *dock;
 447                         while (!SLIST_EMPTY(&(output->dock_clients))) {
 448                                 dock = SLIST_FIRST(&(output->dock_clients));
 449                                 SLIST_INSERT_HEAD(&(first->dock_clients), dock, dock_clients);
 450                                 SLIST_REMOVE_HEAD(&(output->dock_clients), dock_clients);
 451                         }
 452                         output->current_workspace = NULL;
 453                         output->to_be_disabled = false;
 454                 } else if (output->changed) {
 455                         output_change_mode(conn, output);
 456                         output->changed = false;
 457                 }
 458         }
 459
 460         ewmh_update_workarea();
 461
 462         /* Just go through each active output and associate one workspace */
 463         TAILQ_FOREACH(output, &outputs, outputs) {
 464                 if (!output->active || output->current_workspace != NULL)
 465                         continue;
 466                 ws = get_first_workspace_for_output(output);
 467                 initialize_output(conn, output, ws);
 468         }
 469
 470         /* render_layout flushes */
 471         render_layout(conn);
 472 }
 473
 474 /*
 475  * We have just established a connection to the X server and need the initial
 476  * XRandR information to setup workspaces for each screen.
 477  *
 478  */
 479 void initialize_randr(xcb_connection_t *conn, int *event_base) {
 480         const xcb_query_extension_reply_t *extreply;
 481
 482         extreply = xcb_get_extension_data(conn, &xcb_randr_id);
 483         if (!extreply->present)
 484                 disable_randr(conn);
 485         else randr_query_outputs(conn);
 486
 487         if (event_base != NULL)
 488                 *event_base = extreply->first_event;
 489
 490         xcb_randr_select_input(conn, root,
 491                 XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
 492                 XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
 493                 XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE |
 494                 XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY);
 495
 496         xcb_flush(conn);
 497 }