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 #include "client.h"
  39
  40 /* While a clean namespace is usually a pretty good thing, we really need
  41  * to use shorter names than the whole xcb_randr_* default names. */
  42 typedef xcb_randr_get_crtc_info_reply_t crtc_info;
  43 typedef xcb_randr_mode_info_t mode_info;
  44 typedef xcb_randr_get_screen_resources_current_reply_t resources_reply;
  45
  46 /* Stores all outputs available in your current session. */
  47 struct outputs_head outputs = TAILQ_HEAD_INITIALIZER(outputs);
  48
  49 static bool randr_disabled = false;
  50
  51 /*
  52  * Get a specific output by its internal X11 id. Used by randr_query_outputs
  53  * to check if the output is new (only in the first scan) or if we are
  54  * re-scanning.
  55  *
  56  */
  57 static Output *get_output_by_id(xcb_randr_output_t id) {
  58         Output *output;
  59         TAILQ_FOREACH(output, &outputs, outputs)
  60                 if (output->id == id)
  61                         return output;
  62
  63         return NULL;
  64 }
  65
  66 /*
  67  * Returns the output with the given name if it is active (!) or NULL.
  68  *
  69  */
  70 Output *get_output_by_name(const char *name) {
  71         Output *output;
  72         TAILQ_FOREACH(output, &outputs, outputs)
  73                 if (output->active &&
  74                     strcasecmp(output->name, name) == 0)
  75                         return output;
  76
  77         return NULL;
  78 }
  79
  80 /*
  81  * Returns the first output which is active.
  82  *
  83  */
  84 Output *get_first_output() {
  85         Output *output;
  86
  87         TAILQ_FOREACH(output, &outputs, outputs)
  88                 if (output->active)
  89                         return output;
  90
  91         return NULL;
  92 }
  93
  94 /*
  95  * Returns the active (!) output which contains the coordinates x, y or NULL
  96  * if there is no output which contains these coordinates.
  97  *
  98  */
  99 Output *get_output_containing(int x, int y) {
 100         Output *output;
 101         TAILQ_FOREACH(output, &outputs, outputs) {
 102                 if (!output->active)
 103                         continue;
 104                 DLOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
 105                                 x, y, output->rect.x, output->rect.y, output->rect.width, output->rect.height);
 106                 if (x >= output->rect.x && x < (output->rect.x + output->rect.width) &&
 107                     y >= output->rect.y && y < (output->rect.y + output->rect.height))
 108                         return output;
 109         }
 110
 111         return NULL;
 112 }
 113
 114 /*
 115  * Gets the output which is the last one in the given direction, for example
 116  * the output on the most bottom when direction == D_DOWN, the output most
 117  * right when direction == D_RIGHT and so on.
 118  *
 119  * This function always returns a output.
 120  *
 121  */
 122 Output *get_output_most(direction_t direction, Output *current) {
 123         Output *output, *candidate = NULL;
 124         int position = 0;
 125         TAILQ_FOREACH(output, &outputs, outputs) {
 126                 if (!output->active)
 127                         continue;
 128
 129                 /* Repeated calls of WIN determine the winner of the comparison */
 130                 #define WIN(variable, condition) \
 131                         if (variable condition) { \
 132                                 candidate = output; \
 133                                 position = variable; \
 134                         } \
 135                         break;
 136
 137                 if (((direction == D_UP) || (direction == D_DOWN)) &&
 138                     (current->rect.x != output->rect.x))
 139                         continue;
 140
 141                 if (((direction == D_LEFT) || (direction == D_RIGHT)) &&
 142                     (current->rect.y != output->rect.y))
 143                         continue;
 144
 145                 switch (direction) {
 146                         case D_UP:
 147                                 WIN(output->rect.y, <= position);
 148                         case D_DOWN:
 149                                 WIN(output->rect.y, >= position);
 150                         case D_LEFT:
 151                                 WIN(output->rect.x, <= position);
 152                         case D_RIGHT:
 153                                 WIN(output->rect.x, >= position);
 154                 }
 155         }
 156
 157         assert(candidate != NULL);
 158
 159         return candidate;
 160 }
 161
 162 /*
 163  * Initializes the specified output, assigning the specified workspace to it.
 164  *
 165  */
 166 void initialize_output(xcb_connection_t *conn, Output *output, Workspace *workspace) {
 167         i3Font *font = load_font(conn, config.font);
 168
 169         workspace->output = output;
 170         output->current_workspace = workspace;
 171
 172         /* Copy rect for the workspace */
 173         memcpy(&(workspace->rect), &(output->rect), sizeof(Rect));
 174
 175         /* Map clients on the workspace, if any */
 176         workspace_map_clients(conn, workspace);
 177
 178         /* Create a bar window on each output */
 179         if (!config.disable_workspace_bar) {
 180                 Rect bar_rect = {output->rect.x,
 181                                  output->rect.y + output->rect.height - (font->height + 6),
 182                                  output->rect.x + output->rect.width,
 183                                  font->height + 6};
 184                 uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 185                 uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
 186                 output->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
 187                 output->bargc = xcb_generate_id(conn);
 188                 xcb_create_gc(conn, output->bargc, output->bar, 0, 0);
 189         }
 190
 191         SLIST_INIT(&(output->dock_clients));
 192
 193         ipc_send_event("workspace", I3_IPC_EVENT_WORKSPACE, "{\"change\":\"init\"}");
 194         DLOG("initialized output at (%d, %d) with %d x %d\n",
 195                         output->rect.x, output->rect.y, output->rect.width, output->rect.height);
 196 }
 197
 198 /*
 199  * Disables RandR support by creating exactly one output with the size of the
 200  * X11 screen.
 201  *
 202  */
 203 void disable_randr(xcb_connection_t *conn) {
 204         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
 205
 206         DLOG("RandR extension unusable, disabling.\n");
 207
 208         Output *s = scalloc(sizeof(Output));
 209
 210         s->active = true;
 211         s->rect.x = 0;
 212         s->rect.y = 0;
 213         s->rect.width = root_screen->width_in_pixels;
 214         s->rect.height = root_screen->height_in_pixels;
 215         s->name = "xroot-0";
 216
 217         TAILQ_INSERT_TAIL(&outputs, s, outputs);
 218
 219         randr_disabled = true;
 220 }
 221
 222 /*
 223  * This function needs to be called when changing the mode of an output when
 224  * it already has some workspaces (or a bar window) assigned.
 225  *
 226  * It reconfigures the bar window for the new mode, copies the new rect into
 227  * each workspace on this output and forces all windows on the affected
 228  * workspaces to be reconfigured.
 229  *
 230  * It is necessary to call render_layout() afterwards.
 231  *
 232  */
 233 static void output_change_mode(xcb_connection_t *conn, Output *output) {
 234         i3Font *font = load_font(conn, config.font);
 235         Workspace *ws;
 236         Client *client;
 237
 238         DLOG("Output mode changed, reconfiguring bar, updating workspaces\n");
 239         Rect bar_rect = {output->rect.x,
 240                          output->rect.y + output->rect.height - (font->height + 6),
 241                          output->rect.x + output->rect.width,
 242                          font->height + 6};
 243
 244         xcb_set_window_rect(conn, output->bar, bar_rect);
 245
 246         /* go through all workspaces and set force_reconfigure */
 247         TAILQ_FOREACH(ws, workspaces, workspaces) {
 248                 if (ws->output != output)
 249                         continue;
 250
 251                 SLIST_FOREACH(client, &(ws->focus_stack), focus_clients) {
 252                         client->force_reconfigure = true;
 253                         if (!client_is_floating(client))
 254                                 continue;
 255                         /* For floating clients we need to translate the
 256                          * coordinates (old workspace to new workspace) */
 257                         DLOG("old: (%x, %x)\n", client->rect.x, client->rect.y);
 258                         client->rect.x -= ws->rect.x;
 259                         client->rect.y -= ws->rect.y;
 260                         client->rect.x += ws->output->rect.x;
 261                         client->rect.y += ws->output->rect.y;
 262                         DLOG("new: (%x, %x)\n", client->rect.x, client->rect.y);
 263                 }
 264
 265                 /* Update dimensions from output */
 266                 memcpy(&(ws->rect), &(ws->output->rect), sizeof(Rect));
 267
 268                 /* Update the dimensions of a fullscreen client, if any */
 269                 if (ws->fullscreen_client != NULL) {
 270                         DLOG("Updating fullscreen client size\n");
 271                         client = ws->fullscreen_client;
 272                         Rect r = ws->rect;
 273                         xcb_set_window_rect(conn, client->frame, r);
 274
 275                         r.x = 0;
 276                         r.y = 0;
 277                         xcb_set_window_rect(conn, client->child, r);
 278                 }
 279         }
 280 }
 281
 282 /*
 283  * Gets called by randr_query_outputs() for each output. The function adds new
 284  * outputs to the list of outputs, checks if the mode of existing outputs has
 285  * been changed or if an existing output has been disabled. It will then change
 286  * either the "changed" or the "to_be_deleted" flag of the output, if
 287  * appropriate.
 288  *
 289  */
 290 static void handle_output(xcb_connection_t *conn, xcb_randr_output_t id,
 291                           xcb_randr_get_output_info_reply_t *output,
 292                           xcb_timestamp_t cts, resources_reply *res) {
 293         /* each CRT controller has a position in which we are interested in */
 294         crtc_info *crtc;
 295
 296         Output *new = get_output_by_id(id);
 297         bool existing = (new != NULL);
 298         if (!existing)
 299                 new = scalloc(sizeof(Output));
 300         new->id = id;
 301         asprintf(&new->name, "%.*s",
 302                         xcb_randr_get_output_info_name_length(output),
 303                         xcb_randr_get_output_info_name(output));
 304
 305         DLOG("found output with name %s\n", new->name);
 306
 307         /* Even if no CRTC is used at the moment, we store the output so that
 308          * we do not need to change the list ever again (we only update the
 309          * position/size) */
 310         if (output->crtc == XCB_NONE) {
 311                 if (!existing)
 312                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 313                 else if (new->active) {
 314                         new->to_be_disabled = true;
 315
 316                 }
 317                 free(output);
 318                 return;
 319         }
 320
 321         xcb_randr_get_crtc_info_cookie_t icookie;
 322         icookie = xcb_randr_get_crtc_info(conn, output->crtc, cts);
 323         if ((crtc = xcb_randr_get_crtc_info_reply(conn, icookie, NULL)) == NULL) {
 324                 DLOG("Skipping output %s: could not get CRTC (%p)\n",
 325                      new->name, crtc);
 326                 free(new);
 327                 free(output);
 328                 return;
 329         }
 330
 331         new->active = true;
 332         bool updated = update_if_necessary(&(new->rect.x), crtc->x) |
 333                        update_if_necessary(&(new->rect.y), crtc->y) |
 334                        update_if_necessary(&(new->rect.width), crtc->width) |
 335                        update_if_necessary(&(new->rect.height), crtc->height);
 336
 337         DLOG("mode: %dx%d+%d+%d\n", new->rect.width, new->rect.height,
 338                                     new->rect.x, new->rect.y);
 339
 340         /* If we don’t need to change an existing output or if the output
 341          * does not exist in the first place, the case is simple: we either
 342          * need to insert the new output or we are done. */
 343         if (!updated || !existing) {
 344                 if (!existing)
 345                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 346                 free(output);
 347                 return;
 348         }
 349
 350         new->changed = true;
 351 }
 352
 353 /*
 354  * (Re-)queries the outputs via RandR and stores them in the list of outputs.
 355  *
 356  */
 357 void randr_query_outputs(xcb_connection_t *conn) {
 358         Workspace *ws;
 359         Output *output, *other, *first;
 360         xcb_randr_get_screen_resources_current_cookie_t rcookie;
 361         resources_reply *res;
 362         /* timestamp of the configuration so that we get consistent replies to all
 363          * requests (if the configuration changes between our different calls) */
 364         xcb_timestamp_t cts;
 365
 366         /* an output is VGA-1, LVDS-1, etc. (usually physical video outputs) */
 367         xcb_randr_output_t *randr_outputs;
 368
 369         if (randr_disabled)
 370                 return;
 371
 372         /* Get screen resources (crtcs, outputs, modes) */
 373         rcookie = xcb_randr_get_screen_resources_current(conn, root);
 374         if ((res = xcb_randr_get_screen_resources_current_reply(conn, rcookie, NULL)) == NULL) {
 375                 disable_randr(conn);
 376                 return;
 377         }
 378         cts = res->config_timestamp;
 379
 380         int len = xcb_randr_get_screen_resources_current_outputs_length(res);
 381         randr_outputs = xcb_randr_get_screen_resources_current_outputs(res);
 382
 383         /* Request information for each output */
 384         xcb_randr_get_output_info_cookie_t ocookie[len];
 385         for (int i = 0; i < len; i++)
 386                 ocookie[i] = xcb_randr_get_output_info(conn, randr_outputs[i], cts);
 387
 388         /* Loop through all outputs available for this X11 screen */
 389         for (int i = 0; i < len; i++) {
 390                 xcb_randr_get_output_info_reply_t *output;
 391
 392                 if ((output = xcb_randr_get_output_info_reply(conn, ocookie[i], NULL)) == NULL)
 393                         continue;
 394
 395                 handle_output(conn, randr_outputs[i], output, cts, res);
 396         }
 397
 398         free(res);
 399         /* Check for clones, disable the clones and reduce the mode to the
 400          * lowest common mode */
 401         TAILQ_FOREACH(output, &outputs, outputs) {
 402                 if (!output->active || output->to_be_disabled)
 403                         continue;
 404                 DLOG("output %p, position (%d, %d), checking for clones\n",
 405                         output, output->rect.x, output->rect.y);
 406
 407                 for (other = output;
 408                      other != TAILQ_END(&outputs);
 409                      other = TAILQ_NEXT(other, outputs)) {
 410                         if (other == output || !other->active || other->to_be_disabled)
 411                                 continue;
 412
 413                         if (other->rect.x != output->rect.x ||
 414                             other->rect.y != output->rect.y)
 415                                 continue;
 416
 417                         DLOG("output %p has the same position, his mode = %d x %d\n",
 418                                         other, other->rect.width, other->rect.height);
 419                         uint32_t width = min(other->rect.width, output->rect.width);
 420                         uint32_t height = min(other->rect.height, output->rect.height);
 421
 422                         if (update_if_necessary(&(output->rect.width), width) |
 423                             update_if_necessary(&(output->rect.height), height))
 424                                 output->changed = true;
 425
 426                         update_if_necessary(&(other->rect.width), width);
 427                         update_if_necessary(&(other->rect.height), height);
 428
 429                         DLOG("disabling output %p (%s)\n", other, other->name);
 430                         other->to_be_disabled = true;
 431
 432                         DLOG("new output mode %d x %d, other mode %d x %d\n",
 433                                         output->rect.width, output->rect.height,
 434                                         other->rect.width, other->rect.height);
 435                 }
 436         }
 437
 438         /* Handle outputs which have a new mode or are disabled now (either
 439          * because the user disabled them or because they are clones) */
 440         TAILQ_FOREACH(output, &outputs, outputs) {
 441                 if (output->to_be_disabled) {
 442                         output->active = false;
 443                         DLOG("Output %s disabled, re-assigning workspaces/docks\n", output->name);
 444
 445                         if ((first = get_first_output()) == NULL)
 446                                 die("No usable outputs available\n");
 447
 448                         bool needs_init = (first->current_workspace == NULL);
 449
 450                         TAILQ_FOREACH(ws, workspaces, workspaces) {
 451                                 if (ws->output != output)
 452                                         continue;
 453
 454                                 workspace_assign_to(ws, first, true);
 455                                 if (!needs_init)
 456                                         continue;
 457                                 initialize_output(conn, first, ws);
 458                                 needs_init = false;
 459                         }
 460
 461                         Client *dock;
 462                         while (!SLIST_EMPTY(&(output->dock_clients))) {
 463                                 dock = SLIST_FIRST(&(output->dock_clients));
 464                                 SLIST_REMOVE_HEAD(&(output->dock_clients), dock_clients);
 465                                 SLIST_INSERT_HEAD(&(first->dock_clients), dock, dock_clients);
 466                         }
 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         /* Just go through each active output and associate one workspace */
 483         TAILQ_FOREACH(output, &outputs, outputs) {
 484                 if (!output->active || output->current_workspace != NULL)
 485                         continue;
 486                 ws = get_first_workspace_for_output(output);
 487                 initialize_output(conn, output, ws);
 488         }
 489
 490         /* render_layout flushes */
 491         render_layout(conn);
 492 }
 493
 494 /*
 495  * We have just established a connection to the X server and need the initial
 496  * XRandR information to setup workspaces for each screen.
 497  *
 498  */
 499 void initialize_randr(xcb_connection_t *conn, int *event_base) {
 500         const xcb_query_extension_reply_t *extreply;
 501
 502         extreply = xcb_get_extension_data(conn, &xcb_randr_id);
 503         if (!extreply->present)
 504                 disable_randr(conn);
 505         else randr_query_outputs(conn);
 506
 507         if (event_base != NULL)
 508                 *event_base = extreply->first_event;
 509
 510         xcb_randr_select_input(conn, root,
 511                 XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
 512                 XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
 513                 XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE |
 514                 XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY);
 515
 516         xcb_flush(conn);
 517 }