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                 /* Repeated calls of WIN determine the winner of the comparison */
 123                 #define WIN(variable, condition) \
 124                         if (variable condition) { \
 125                                 candidate = screen; \
 126                                 position = variable; \
 127                         } \
 128                         break;
 129
 130                 if (((direction == D_UP) || (direction == D_DOWN)) &&
 131                     (current->rect.x != screen->rect.x))
 132                         continue;
 133
 134                 if (((direction == D_LEFT) || (direction == D_RIGHT)) &&
 135                     (current->rect.y != screen->rect.y))
 136                         continue;
 137
 138                 switch (direction) {
 139                         case D_UP:
 140                                 WIN(screen->rect.y, <= position);
 141                         case D_DOWN:
 142                                 WIN(screen->rect.y, >= position);
 143                         case D_LEFT:
 144                                 WIN(screen->rect.x, <= position);
 145                         case D_RIGHT:
 146                                 WIN(screen->rect.x, >= position);
 147                 }
 148         }
 149
 150         assert(candidate != NULL);
 151
 152         return candidate;
 153 }
 154
 155 static void initialize_output(xcb_connection_t *conn, Output *output,
 156                               Workspace *workspace) {
 157         i3Font *font = load_font(conn, config.font);
 158
 159         workspace->output = output;
 160         output->current_workspace = workspace;
 161
 162         /* Create a xoutput for each output */
 163         Rect bar_rect = {output->rect.x,
 164                          output->rect.y + output->rect.height - (font->height + 6),
 165                          output->rect.x + output->rect.width,
 166                          font->height + 6};
 167         uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 168         uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
 169         output->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
 170         output->bargc = xcb_generate_id(conn);
 171         xcb_create_gc(conn, output->bargc, output->bar, 0, 0);
 172
 173         SLIST_INIT(&(output->dock_clients));
 174
 175         DLOG("initialized output at (%d, %d) with %d x %d\n",
 176                         output->rect.x, output->rect.y, output->rect.width, output->rect.height);
 177 }
 178
 179 /*
 180  * Fills virtual_screens with exactly one screen with width/height of the
 181  * whole X screen.
 182  *
 183  */
 184 static void disable_randr(xcb_connection_t *conn) {
 185         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
 186
 187         DLOG("RandR extension not found, disabling.\n");
 188
 189         Output *s = scalloc(sizeof(Output));
 190
 191         s->active = true;
 192         s->rect.x = 0;
 193         s->rect.y = 0;
 194         s->rect.width = root_screen->width_in_pixels;
 195         s->rect.height = root_screen->height_in_pixels;
 196
 197         TAILQ_INSERT_TAIL(&outputs, s, outputs);
 198 }
 199
 200 /*
 201  * Searches for a mode in the current RandR configuration by the mode id.
 202  * Returns NULL if no such mode could be found (should never happen).
 203  *
 204  */
 205 static mode_info *get_mode_by_id(resources_reply *reply, xcb_randr_mode_t mode) {
 206         xcb_randr_mode_info_iterator_t it;
 207
 208         for (it = xcb_randr_get_screen_resources_current_modes_iterator(reply);
 209                 it.rem > 0;
 210                 xcb_randr_mode_info_next(&it)) {
 211                 if (it.data->id == mode)
 212                         return it.data;
 213         }
 214
 215         return NULL;
 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 }
 254
 255 /*
 256  * Gets called by randr_query_screens() for each output. The function adds new
 257  * outputs to the list of outputs, checks if the mode of existing outputs has
 258  * been changed or if an existing output has been disabled.
 259  *
 260  */
 261 static void handle_output(xcb_connection_t *conn, xcb_randr_output_t id,
 262                           xcb_randr_get_output_info_reply_t *output,
 263                           xcb_timestamp_t cts, resources_reply *res) {
 264         Workspace *ws;
 265
 266         /* each CRT controller has a position in which we are interested in */
 267         crtc_info *crtc;
 268
 269         /* the CRTC runs in a specific mode, while the position is stored in
 270          * the output itself */
 271         mode_info *mode;
 272
 273         Output *new = get_output_by_id(id);
 274         bool existing = (new != NULL);
 275         if (!existing)
 276                 new = scalloc(sizeof(Output));
 277         new->id = id;
 278         asprintf(&new->name, "%.*s",
 279                         xcb_randr_get_output_info_name_length(output),
 280                         xcb_randr_get_output_info_name(output));
 281
 282         DLOG("found output with name %s\n", new->name);
 283
 284         /* Even if no CRTC is used at the moment, we store the output so that
 285          * we do not need to change the list ever again (we only update the
 286          * position/size) */
 287         if (output->crtc == XCB_NONE) {
 288                 if (!existing)
 289                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 290                 else if (new->active) {
 291                         new->active = false;
 292                         new->current_workspace = NULL;
 293                         DLOG("Output %s disabled (no CRTC)\n", new->name);
 294                         TAILQ_FOREACH(ws, workspaces, workspaces) {
 295                                 if (ws->output != new)
 296                                         continue;
 297
 298                                 workspace_assign_to(ws, get_first_output());
 299                         }
 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             (mode = get_mode_by_id(res, crtc->mode)) == NULL) {
 310                 DLOG("Skipping output %s: could not get CRTC/mode (%p/%p)\n",
 311                      new->name, crtc, mode);
 312                 free(new);
 313                 free(output);
 314                 return;
 315         }
 316
 317         new->active = true;
 318         bool updated = update_if_necessary(&(new->rect.x), crtc->x) |
 319                        update_if_necessary(&(new->rect.y), crtc->y) |
 320                        update_if_necessary(&(new->rect.width), mode->width) |
 321                        update_if_necessary(&(new->rect.height), mode->height);
 322
 323         DLOG("mode: %dx%d+%d+%d\n", new->rect.width, new->rect.height,
 324                                     new->rect.x, new->rect.y);
 325
 326         /* If we don’t need to change an existing output or if the output
 327          * does not exist in the first place, the case is simple: we either
 328          * need to insert the new output or we are done. */
 329         if (!updated || !existing) {
 330                 if (!existing)
 331                         TAILQ_INSERT_TAIL(&outputs, new, outputs);
 332                 free(output);
 333                 return;
 334         }
 335
 336         output_change_mode(conn, new);
 337 }
 338
 339 /*
 340  * (Re-)queries the outputs via RandR and stores them in the list of outputs.
 341  *
 342  */
 343 void randr_query_screens(xcb_connection_t *conn) {
 344         xcb_randr_get_screen_resources_current_cookie_t rcookie;
 345         resources_reply *res;
 346         /* timestamp of the configuration so that we get consistent replies to all
 347          * requests (if the configuration changes between our different calls) */
 348         xcb_timestamp_t cts;
 349
 350         /* an output is VGA-1, LVDS-1, etc. (usually physical video outputs) */
 351         xcb_randr_output_t *randr_outputs;
 352
 353         /* Get screen resources (crtcs, outputs, modes) */
 354         rcookie = xcb_randr_get_screen_resources_current(conn, root);
 355         if ((res = xcb_randr_get_screen_resources_current_reply(conn, rcookie, NULL)) == NULL)
 356                 die("Could not get RandR screen resources\n");
 357         cts = res->config_timestamp;
 358
 359         int len = xcb_randr_get_screen_resources_current_outputs_length(res);
 360         randr_outputs = xcb_randr_get_screen_resources_current_outputs(res);
 361
 362         /* Request information for each output */
 363         xcb_randr_get_output_info_cookie_t ocookie[len];
 364         for (int i = 0; i < len; i++)
 365                 ocookie[i] = xcb_randr_get_output_info(conn, randr_outputs[i], cts);
 366
 367         /* Loop through all outputs available for this X11 screen */
 368         xcb_randr_get_output_info_reply_t *output;
 369         for (int i = 0; i < len; i++) {
 370                 if ((output = xcb_randr_get_output_info_reply(conn, ocookie[i], NULL)) == NULL)
 371                         continue;
 372
 373                 handle_output(conn, randr_outputs[i], output, cts, res);
 374         }
 375
 376         free(res);
 377         Output *screen, *oscreen;
 378         /* Check for clones and reduce the mode  to the lowest common mode */
 379         TAILQ_FOREACH(screen, &outputs, outputs) {
 380                 if (!screen->active)
 381                         continue;
 382                 DLOG("screen %p, position (%d, %d), checking for clones\n",
 383                         screen, screen->rect.x, screen->rect.y);
 384
 385                 TAILQ_FOREACH(oscreen, &outputs, outputs) {
 386                         if (oscreen == screen || !oscreen->active)
 387                                 continue;
 388
 389                         if (oscreen->rect.x != screen->rect.x ||
 390                             oscreen->rect.y != screen->rect.y)
 391                                 continue;
 392
 393                         DLOG("screen %p has the same position, his mode = %d x %d\n",
 394                                         oscreen, oscreen->rect.width, oscreen->rect.height);
 395                         uint32_t width = min(oscreen->rect.width, screen->rect.width);
 396                         uint32_t height = min(oscreen->rect.height, screen->rect.height);
 397
 398                         if (update_if_necessary(&(screen->rect.width), width) |
 399                             update_if_necessary(&(screen->rect.height), height))
 400                                 output_change_mode(conn, screen);
 401
 402                         if (update_if_necessary(&(oscreen->rect.width), width) |
 403                             update_if_necessary(&(oscreen->rect.height), height))
 404                                 output_change_mode(conn, oscreen);
 405
 406
 407                         DLOG("new screen mode %d x %d, oscreen mode %d x %d\n",
 408                                         screen->rect.width, screen->rect.height,
 409                                         oscreen->rect.width, oscreen->rect.height);
 410                 }
 411         }
 412
 413         ewmh_update_workarea();
 414
 415         /* Just go through each workspace and associate as many screens as we can. */
 416         TAILQ_FOREACH(screen, &outputs, outputs) {
 417                 if (!screen->active || screen->current_workspace != NULL)
 418                         continue;
 419                 Workspace *ws = get_first_workspace_for_screen(screen);
 420                 initialize_output(conn, screen, ws);
 421         }
 422
 423         /* render_layout flushes */
 424         render_layout(conn);
 425 }
 426
 427 /*
 428  * We have just established a connection to the X server and need the initial
 429  * XRandR information to setup workspaces for each screen.
 430  *
 431  */
 432 void initialize_randr(xcb_connection_t *conn, int *event_base) {
 433         const xcb_query_extension_reply_t *extreply;
 434
 435         extreply = xcb_get_extension_data(conn, &xcb_randr_id);
 436         if (!extreply->present)
 437                 disable_randr(conn);
 438         else randr_query_screens(conn);
 439
 440         if (event_base != NULL)
 441                 *event_base = extreply->first_event;
 442
 443         xcb_randr_select_input(conn, root,
 444                 XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
 445                 XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
 446                 XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE |
 447                 XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY);
 448
 449         xcb_flush(conn);
 450 }