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 xoutput for each output */
 177         Rect bar_rect = {output->rect.x,
 178                          output->rect.y + output->rect.height - (font->height + 6),
 179                          output->rect.x + output->rect.width,
 180                          font->height + 6};
 181         uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 182         uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
 183         output->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
 184         output->bargc = xcb_generate_id(conn);
 185         xcb_create_gc(conn, output->bargc, output->bar, 0, 0);
 186
 187         SLIST_INIT(&(output->dock_clients));
 188
 189         DLOG("initialized output at (%d, %d) with %d x %d\n",
 190                         output->rect.x, output->rect.y, output->rect.width, output->rect.height);
 191 }
 192
 193 /*
 194  * Disables RandR support by creating exactly one output with the size of the
 195  * X11 screen.
 196  *
 197  */
 198 void disable_randr(xcb_connection_t *conn) {
 199         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
 200
 201         DLOG("RandR extension unusable, disabling.\n");
 202
 203         Output *s = scalloc(sizeof(Output));
 204
 205         s->active = true;
 206         s->rect.x = 0;
 207         s->rect.y = 0;
 208         s->rect.width = root_screen->width_in_pixels;
 209         s->rect.height = root_screen->height_in_pixels;
 210
 211         TAILQ_INSERT_TAIL(&outputs, s, outputs);
 212
 213         randr_disabled = true;
 214 }
 215
 216 /*
 217  * Searches for a mode in the current RandR configuration by the mode id.
 218  * Returns NULL if no such mode could be found (should never happen).
 219  *
 220  */
 221 static mode_info *get_mode_by_id(resources_reply *reply, xcb_randr_mode_t mode) {
 222         xcb_randr_mode_info_iterator_t it;
 223
 224         for (it = xcb_randr_get_screen_resources_current_modes_iterator(reply);
 225                 it.rem > 0;
 226                 xcb_randr_mode_info_next(&it)) {
 227                 if (it.data->id == mode)
 228                         return it.data;
 229         }
 230
 231         return NULL;
 232 }
 233
 234 /*
 235  * This function needs to be called when changing the mode of an output when
 236  * it already has some workspaces (or a bar window) assigned.
 237  *
 238  * It reconfigures the bar window for the new mode, copies the new rect into
 239  * each workspace on this output and forces all windows on the affected
 240  * workspaces to be reconfigured.
 241  *
 242  * It is necessary to call render_layout() afterwards.
 243  *
 244  */
 245 static void output_change_mode(xcb_connection_t *conn, Output *output) {
 246         i3Font *font = load_font(conn, config.font);
 247         Workspace *ws;
 248         Client *client;
 249
 250         DLOG("Output mode changed, reconfiguring bar, updating workspaces\n");
 251         Rect bar_rect = {output->rect.x,
 252                          output->rect.y + output->rect.height - (font->height + 6),
 253                          output->rect.x + output->rect.width,
 254                          font->height + 6};
 255
 256         xcb_set_window_rect(conn, output->bar, bar_rect);
 257
 258         /* go through all workspaces and set force_reconfigure */
 259         TAILQ_FOREACH(ws, workspaces, workspaces) {
 260                 if (ws->output != output)
 261                         continue;
 262
 263                 /* Update dimensions from output */
 264                 memcpy(&(ws->rect), &(ws->output->rect), sizeof(Rect));
 265
 266                 SLIST_FOREACH(client, &(ws->focus_stack), focus_clients)
 267                         client->force_reconfigure = true;
 268
 269                 /* Update the dimensions of a fullscreen client, if any */
 270                 if (ws->fullscreen_client != NULL) {
 271                         DLOG("Updating fullscreen client size\n");
 272                         client = ws->fullscreen_client;
 273                         Rect r = ws->rect;
 274                         xcb_set_window_rect(conn, client->frame, r);
 275
 276                         r.x = 0;
 277                         r.y = 0;
 278                         xcb_set_window_rect(conn, client->child, r);
 279                 }
 280         }
 281 }
 282
 283 /*
 284  * Gets called by randr_query_outputs() for each output. The function adds new
 285  * outputs to the list of outputs, checks if the mode of existing outputs has
 286  * been changed or if an existing output has been disabled. It will then change
 287  * either the "changed" or the "to_be_deleted" flag of the output, if
 288  * appropriate.
 289  *
 290  */
 291 static void handle_output(xcb_connection_t *conn, xcb_randr_output_t id,
 292                           xcb_randr_get_output_info_reply_t *output,
 293                           xcb_timestamp_t cts, resources_reply *res) {
 294         /* each CRT controller has a position in which we are interested in */
 295         crtc_info *crtc;
 296
 297         /* the CRTC runs in a specific mode, while the position is stored in
 298          * the output itself */
 299         mode_info *mode;
 300
 301         Output *new = get_output_by_id(id);
 302         bool existing = (new != NULL);
 303         if (!existing)
 304                 new = scalloc(sizeof(Output));
 305         new->id = id;
 306         asprintf(&new->name, "%.*s",
 307                         xcb_randr_get_output_info_name_length(output),
 308                         xcb_randr_get_output_info_name(output));
 309
 310         DLOG("found output with name %s\n", new->name);
 311
 312         /* Even if no CRTC is used at the moment, we store the output so that
 313          * we do not need to change the list ever again (we only update the
 314          * position/size) */
 315         if (output->crtc == XCB_NONE) {
 316                 if (!existing)
 317                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 318                 else if (new->active) {
 319                         new->to_be_disabled = true;
 320
 321                 }
 322                 free(output);
 323                 return;
 324         }
 325
 326         xcb_randr_get_crtc_info_cookie_t icookie;
 327         icookie = xcb_randr_get_crtc_info(conn, output->crtc, cts);
 328         if ((crtc = xcb_randr_get_crtc_info_reply(conn, icookie, NULL)) == NULL ||
 329             (mode = get_mode_by_id(res, crtc->mode)) == NULL) {
 330                 DLOG("Skipping output %s: could not get CRTC/mode (%p/%p)\n",
 331                      new->name, crtc, mode);
 332                 free(new);
 333                 free(output);
 334                 return;
 335         }
 336
 337         new->active = true;
 338         bool updated = update_if_necessary(&(new->rect.x), crtc->x) |
 339                        update_if_necessary(&(new->rect.y), crtc->y) |
 340                        update_if_necessary(&(new->rect.width), mode->width) |
 341                        update_if_necessary(&(new->rect.height), mode->height);
 342
 343         DLOG("mode: %dx%d+%d+%d\n", new->rect.width, new->rect.height,
 344                                     new->rect.x, new->rect.y);
 345
 346         /* If we don’t need to change an existing output or if the output
 347          * does not exist in the first place, the case is simple: we either
 348          * need to insert the new output or we are done. */
 349         if (!updated || !existing) {
 350                 if (!existing)
 351                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 352                 free(output);
 353                 return;
 354         }
 355
 356         new->changed = true;
 357 }
 358
 359 /*
 360  * (Re-)queries the outputs via RandR and stores them in the list of outputs.
 361  *
 362  */
 363 void randr_query_outputs(xcb_connection_t *conn) {
 364         Workspace *ws;
 365         Output *output, *other, *first;
 366         xcb_randr_get_screen_resources_current_cookie_t rcookie;
 367         resources_reply *res;
 368         /* timestamp of the configuration so that we get consistent replies to all
 369          * requests (if the configuration changes between our different calls) */
 370         xcb_timestamp_t cts;
 371
 372         /* an output is VGA-1, LVDS-1, etc. (usually physical video outputs) */
 373         xcb_randr_output_t *randr_outputs;
 374
 375         if (randr_disabled)
 376                 return;
 377
 378         /* Get screen resources (crtcs, outputs, modes) */
 379         rcookie = xcb_randr_get_screen_resources_current(conn, root);
 380         if ((res = xcb_randr_get_screen_resources_current_reply(conn, rcookie, NULL)) == NULL) {
 381                 disable_randr(conn);
 382                 return;
 383         }
 384         cts = res->config_timestamp;
 385
 386         int len = xcb_randr_get_screen_resources_current_outputs_length(res);
 387         randr_outputs = xcb_randr_get_screen_resources_current_outputs(res);
 388
 389         /* Request information for each output */
 390         xcb_randr_get_output_info_cookie_t ocookie[len];
 391         for (int i = 0; i < len; i++)
 392                 ocookie[i] = xcb_randr_get_output_info(conn, randr_outputs[i], cts);
 393
 394         /* Loop through all outputs available for this X11 screen */
 395         for (int i = 0; i < len; i++) {
 396                 xcb_randr_get_output_info_reply_t *output;
 397
 398                 if ((output = xcb_randr_get_output_info_reply(conn, ocookie[i], NULL)) == NULL)
 399                         continue;
 400
 401                 handle_output(conn, randr_outputs[i], output, cts, res);
 402         }
 403
 404         free(res);
 405         /* Check for clones, disable the clones and reduce the mode to the
 406          * lowest common mode */
 407         TAILQ_FOREACH(output, &outputs, outputs) {
 408                 if (!output->active || output->to_be_disabled)
 409                         continue;
 410                 DLOG("output %p, position (%d, %d), checking for clones\n",
 411                         output, output->rect.x, output->rect.y);
 412
 413                 for (other = output;
 414                      other != TAILQ_END(&outputs);
 415                      other = TAILQ_NEXT(other, outputs)) {
 416                         if (other == output || !other->active || other->to_be_disabled)
 417                                 continue;
 418
 419                         if (other->rect.x != output->rect.x ||
 420                             other->rect.y != output->rect.y)
 421                                 continue;
 422
 423                         DLOG("output %p has the same position, his mode = %d x %d\n",
 424                                         other, other->rect.width, other->rect.height);
 425                         uint32_t width = min(other->rect.width, output->rect.width);
 426                         uint32_t height = min(other->rect.height, output->rect.height);
 427
 428                         if (update_if_necessary(&(output->rect.width), width) |
 429                             update_if_necessary(&(output->rect.height), height))
 430                                 output->changed = true;
 431
 432                         update_if_necessary(&(other->rect.width), width);
 433                         update_if_necessary(&(other->rect.height), height);
 434
 435                         DLOG("disabling output %p (%s)\n", other, other->name);
 436                         other->to_be_disabled = true;
 437
 438                         DLOG("new output mode %d x %d, other mode %d x %d\n",
 439                                         output->rect.width, output->rect.height,
 440                                         other->rect.width, other->rect.height);
 441                 }
 442         }
 443
 444         /* Handle outputs which have a new mode or are disabled now (either
 445          * because the user disabled them or because they are clones) */
 446         TAILQ_FOREACH(output, &outputs, outputs) {
 447                 if (output->to_be_disabled) {
 448                         output->active = false;
 449                         DLOG("Output %s disabled, re-assigning workspaces/docks\n", output->name);
 450
 451                         if ((first = get_first_output()) == NULL)
 452                                 die("No usable outputs available\n");
 453
 454                         bool needs_init = (first->current_workspace == NULL);
 455
 456                         TAILQ_FOREACH(ws, workspaces, workspaces) {
 457                                 if (ws->output != output)
 458                                         continue;
 459
 460                                 workspace_assign_to(ws, first, true);
 461                                 if (!needs_init)
 462                                         continue;
 463                                 initialize_output(conn, first, ws);
 464                                 needs_init = false;
 465                         }
 466
 467                         Client *dock;
 468                         while (!SLIST_EMPTY(&(output->dock_clients))) {
 469                                 dock = SLIST_FIRST(&(output->dock_clients));
 470                                 SLIST_INSERT_HEAD(&(first->dock_clients), dock, dock_clients);
 471                                 SLIST_REMOVE_HEAD(&(output->dock_clients), dock_clients);
 472                         }
 473                         output->current_workspace = NULL;
 474                         output->to_be_disabled = false;
 475                 } else if (output->changed) {
 476                         output_change_mode(conn, output);
 477                         output->changed = false;
 478                 }
 479         }
 480
 481         ewmh_update_workarea();
 482
 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
 491         /* render_layout flushes */
 492         render_layout(conn);
 493 }
 494
 495 /*
 496  * We have just established a connection to the X server and need the initial
 497  * XRandR information to setup workspaces for each screen.
 498  *
 499  */
 500 void initialize_randr(xcb_connection_t *conn, int *event_base) {
 501         const xcb_query_extension_reply_t *extreply;
 502
 503         extreply = xcb_get_extension_data(conn, &xcb_randr_id);
 504         if (!extreply->present)
 505                 disable_randr(conn);
 506         else randr_query_outputs(conn);
 507
 508         if (event_base != NULL)
 509                 *event_base = extreply->first_event;
 510
 511         xcb_randr_select_input(conn, root,
 512                 XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
 513                 XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
 514                 XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE |
 515                 XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY);
 516
 517         xcb_flush(conn);
 518 }