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 /*
  48  * Get a specific output by its internal X11 id. Used by randr_query_screens
  49  * to check if the output is new (only in the first scan) or if we are
  50  * re-scanning.
  51  *
  52  */
  53 static Output *get_output_by_id(xcb_randr_output_t id) {
  54         Output *output;
  55         TAILQ_FOREACH(output, &outputs, outputs)
  56                 if (output->id == id)
  57                         return output;
  58
  59         return NULL;
  60 }
  61
  62 /*
  63  * Returns the output with the given name if it is active (!) or NULL.
  64  *
  65  */
  66 Output *get_output_by_name(const char *name) {
  67         Output *output;
  68         TAILQ_FOREACH(output, &outputs, outputs)
  69                 if (output->active &&
  70                     strcasecmp(output->name, name) == 0)
  71                         return output;
  72
  73         return NULL;
  74 }
  75
  76 /*
  77  * Returns the first output which is active.
  78  *
  79  */
  80 Output *get_first_output() {
  81         Output *screen;
  82
  83         TAILQ_FOREACH(screen, &outputs, outputs) {
  84                 if (screen->active)
  85                         return screen;
  86         }
  87
  88         return NULL;
  89 }
  90
  91 /*
  92  * Looks in virtual_screens for the Output which contains coordinates x, y
  93  *
  94  */
  95 Output *get_screen_containing(int x, int y) {
  96         Output *screen;
  97         TAILQ_FOREACH(screen, &outputs, outputs) {
  98                 if (!screen->active)
  99                         continue;
 100                 DLOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
 101                                 x, y, screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
 102                 if (x >= screen->rect.x && x < (screen->rect.x + screen->rect.width) &&
 103                     y >= screen->rect.y && y < (screen->rect.y + screen->rect.height))
 104                         return screen;
 105         }
 106
 107         return NULL;
 108 }
 109
 110 /*
 111  * Gets the screen which is the last one in the given direction, for example the screen
 112  * on the most bottom when direction == D_DOWN, the screen most right when direction == D_RIGHT
 113  * and so on.
 114  *
 115  * This function always returns a screen.
 116  *
 117  */
 118 Output *get_screen_most(direction_t direction, Output *current) {
 119         Output *screen, *candidate = NULL;
 120         int position = 0;
 121         TAILQ_FOREACH(screen, &outputs, outputs) {
 122                 if (!screen->active)
 123                         continue;
 124
 125                 /* Repeated calls of WIN determine the winner of the comparison */
 126                 #define WIN(variable, condition) \
 127                         if (variable condition) { \
 128                                 candidate = screen; \
 129                                 position = variable; \
 130                         } \
 131                         break;
 132
 133                 if (((direction == D_UP) || (direction == D_DOWN)) &&
 134                     (current->rect.x != screen->rect.x))
 135                         continue;
 136
 137                 if (((direction == D_LEFT) || (direction == D_RIGHT)) &&
 138                     (current->rect.y != screen->rect.y))
 139                         continue;
 140
 141                 switch (direction) {
 142                         case D_UP:
 143                                 WIN(screen->rect.y, <= position);
 144                         case D_DOWN:
 145                                 WIN(screen->rect.y, >= position);
 146                         case D_LEFT:
 147                                 WIN(screen->rect.x, <= position);
 148                         case D_RIGHT:
 149                                 WIN(screen->rect.x, >= position);
 150                 }
 151         }
 152
 153         assert(candidate != NULL);
 154
 155         return candidate;
 156 }
 157
 158 static void initialize_output(xcb_connection_t *conn, Output *output,
 159                               Workspace *workspace) {
 160         i3Font *font = load_font(conn, config.font);
 161
 162         workspace->output = output;
 163         output->current_workspace = workspace;
 164
 165         /* Create a xoutput for each output */
 166         Rect bar_rect = {output->rect.x,
 167                          output->rect.y + output->rect.height - (font->height + 6),
 168                          output->rect.x + output->rect.width,
 169                          font->height + 6};
 170         uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 171         uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
 172         output->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
 173         output->bargc = xcb_generate_id(conn);
 174         xcb_create_gc(conn, output->bargc, output->bar, 0, 0);
 175
 176         SLIST_INIT(&(output->dock_clients));
 177
 178         DLOG("initialized output at (%d, %d) with %d x %d\n",
 179                         output->rect.x, output->rect.y, output->rect.width, output->rect.height);
 180 }
 181
 182 /*
 183  * Fills virtual_screens with exactly one screen with width/height of the
 184  * whole X screen.
 185  *
 186  */
 187 static void disable_randr(xcb_connection_t *conn) {
 188         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
 189
 190         DLOG("RandR extension not found, disabling.\n");
 191
 192         Output *s = scalloc(sizeof(Output));
 193
 194         s->active = true;
 195         s->rect.x = 0;
 196         s->rect.y = 0;
 197         s->rect.width = root_screen->width_in_pixels;
 198         s->rect.height = root_screen->height_in_pixels;
 199
 200         TAILQ_INSERT_TAIL(&outputs, s, outputs);
 201 }
 202
 203 /*
 204  * Searches for a mode in the current RandR configuration by the mode id.
 205  * Returns NULL if no such mode could be found (should never happen).
 206  *
 207  */
 208 static mode_info *get_mode_by_id(resources_reply *reply, xcb_randr_mode_t mode) {
 209         xcb_randr_mode_info_iterator_t it;
 210
 211         for (it = xcb_randr_get_screen_resources_current_modes_iterator(reply);
 212                 it.rem > 0;
 213                 xcb_randr_mode_info_next(&it)) {
 214                 if (it.data->id == mode)
 215                         return it.data;
 216         }
 217
 218         return NULL;
 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 }
 257
 258 /*
 259  * Gets called by randr_query_screens() for each output. The function adds new
 260  * outputs to the list of outputs, checks if the mode of existing outputs has
 261  * been changed or if an existing output has been disabled.
 262  *
 263  */
 264 static void handle_output(xcb_connection_t *conn, xcb_randr_output_t id,
 265                           xcb_randr_get_output_info_reply_t *output,
 266                           xcb_timestamp_t cts, resources_reply *res) {
 267         Workspace *ws;
 268
 269         /* each CRT controller has a position in which we are interested in */
 270         crtc_info *crtc;
 271
 272         /* the CRTC runs in a specific mode, while the position is stored in
 273          * the output itself */
 274         mode_info *mode;
 275
 276         Output *new = get_output_by_id(id);
 277         bool existing = (new != NULL);
 278         if (!existing)
 279                 new = scalloc(sizeof(Output));
 280         new->id = id;
 281         asprintf(&new->name, "%.*s",
 282                         xcb_randr_get_output_info_name_length(output),
 283                         xcb_randr_get_output_info_name(output));
 284
 285         DLOG("found output with name %s\n", new->name);
 286
 287         /* Even if no CRTC is used at the moment, we store the output so that
 288          * we do not need to change the list ever again (we only update the
 289          * position/size) */
 290         if (output->crtc == XCB_NONE) {
 291                 if (!existing)
 292                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 293                 else if (new->active) {
 294                         new->active = false;
 295                         new->current_workspace = NULL;
 296                         DLOG("Output %s disabled (no CRTC)\n", new->name);
 297                         TAILQ_FOREACH(ws, workspaces, workspaces) {
 298                                 if (ws->output != new)
 299                                         continue;
 300
 301                                 workspace_assign_to(ws, get_first_output());
 302                         }
 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             (mode = get_mode_by_id(res, crtc->mode)) == NULL) {
 313                 DLOG("Skipping output %s: could not get CRTC/mode (%p/%p)\n",
 314                      new->name, crtc, mode);
 315                 free(new);
 316                 free(output);
 317                 return;
 318         }
 319
 320         new->active = true;
 321         bool updated = update_if_necessary(&(new->rect.x), crtc->x) |
 322                        update_if_necessary(&(new->rect.y), crtc->y) |
 323                        update_if_necessary(&(new->rect.width), mode->width) |
 324                        update_if_necessary(&(new->rect.height), mode->height);
 325
 326         DLOG("mode: %dx%d+%d+%d\n", new->rect.width, new->rect.height,
 327                                     new->rect.x, new->rect.y);
 328
 329         /* If we don’t need to change an existing output or if the output
 330          * does not exist in the first place, the case is simple: we either
 331          * need to insert the new output or we are done. */
 332         if (!updated || !existing) {
 333                 if (!existing)
 334                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 335                 free(output);
 336                 return;
 337         }
 338
 339         output_change_mode(conn, new);
 340 }
 341
 342 /*
 343  * (Re-)queries the outputs via RandR and stores them in the list of outputs.
 344  *
 345  */
 346 void randr_query_screens(xcb_connection_t *conn) {
 347         xcb_randr_get_screen_resources_current_cookie_t rcookie;
 348         resources_reply *res;
 349         /* timestamp of the configuration so that we get consistent replies to all
 350          * requests (if the configuration changes between our different calls) */
 351         xcb_timestamp_t cts;
 352
 353         /* an output is VGA-1, LVDS-1, etc. (usually physical video outputs) */
 354         xcb_randr_output_t *randr_outputs;
 355
 356         /* Get screen resources (crtcs, outputs, modes) */
 357         rcookie = xcb_randr_get_screen_resources_current(conn, root);
 358         if ((res = xcb_randr_get_screen_resources_current_reply(conn, rcookie, NULL)) == NULL)
 359                 die("Could not get RandR screen resources\n");
 360         cts = res->config_timestamp;
 361
 362         int len = xcb_randr_get_screen_resources_current_outputs_length(res);
 363         randr_outputs = xcb_randr_get_screen_resources_current_outputs(res);
 364
 365         /* Request information for each output */
 366         xcb_randr_get_output_info_cookie_t ocookie[len];
 367         for (int i = 0; i < len; i++)
 368                 ocookie[i] = xcb_randr_get_output_info(conn, randr_outputs[i], cts);
 369
 370         /* Loop through all outputs available for this X11 screen */
 371         xcb_randr_get_output_info_reply_t *output;
 372         for (int i = 0; i < len; i++) {
 373                 if ((output = xcb_randr_get_output_info_reply(conn, ocookie[i], NULL)) == NULL)
 374                         continue;
 375
 376                 handle_output(conn, randr_outputs[i], output, cts, res);
 377         }
 378
 379         free(res);
 380         Output *screen, *oscreen;
 381         /* Check for clones and reduce the mode  to the lowest common mode */
 382         TAILQ_FOREACH(screen, &outputs, outputs) {
 383                 if (!screen->active)
 384                         continue;
 385                 DLOG("screen %p, position (%d, %d), checking for clones\n",
 386                         screen, screen->rect.x, screen->rect.y);
 387
 388                 TAILQ_FOREACH(oscreen, &outputs, outputs) {
 389                         if (oscreen == screen || !oscreen->active)
 390                                 continue;
 391
 392                         if (oscreen->rect.x != screen->rect.x ||
 393                             oscreen->rect.y != screen->rect.y)
 394                                 continue;
 395
 396                         DLOG("screen %p has the same position, his mode = %d x %d\n",
 397                                         oscreen, oscreen->rect.width, oscreen->rect.height);
 398                         uint32_t width = min(oscreen->rect.width, screen->rect.width);
 399                         uint32_t height = min(oscreen->rect.height, screen->rect.height);
 400
 401                         if (update_if_necessary(&(screen->rect.width), width) |
 402                             update_if_necessary(&(screen->rect.height), height))
 403                                 output_change_mode(conn, screen);
 404
 405                         if (update_if_necessary(&(oscreen->rect.width), width) |
 406                             update_if_necessary(&(oscreen->rect.height), height))
 407                                 output_change_mode(conn, oscreen);
 408
 409
 410                         DLOG("new screen mode %d x %d, oscreen mode %d x %d\n",
 411                                         screen->rect.width, screen->rect.height,
 412                                         oscreen->rect.width, oscreen->rect.height);
 413                 }
 414         }
 415
 416         ewmh_update_workarea();
 417
 418         /* Just go through each workspace and associate as many screens as we can. */
 419         TAILQ_FOREACH(screen, &outputs, outputs) {
 420                 if (!screen->active || screen->current_workspace != NULL)
 421                         continue;
 422                 Workspace *ws = get_first_workspace_for_screen(screen);
 423                 initialize_output(conn, screen, ws);
 424         }
 425
 426         /* render_layout flushes */
 427         render_layout(conn);
 428 }
 429
 430 /*
 431  * We have just established a connection to the X server and need the initial
 432  * XRandR information to setup workspaces for each screen.
 433  *
 434  */
 435 void initialize_randr(xcb_connection_t *conn, int *event_base) {
 436         const xcb_query_extension_reply_t *extreply;
 437
 438         extreply = xcb_get_extension_data(conn, &xcb_randr_id);
 439         if (!extreply->present)
 440                 disable_randr(conn);
 441         else randr_query_screens(conn);
 442
 443         if (event_base != NULL)
 444                 *event_base = extreply->first_event;
 445
 446         xcb_randr_select_input(conn, root,
 447                 XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
 448                 XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
 449                 XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE |
 450                 XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY);
 451
 452         xcb_flush(conn);
 453 }