git.sur5r.net Git - i3/i3/blob - src/xinerama.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  * This is LEGACY code (we support RandR, which can do much more than
  11  * Xinerama), but necessary for the poor users of the nVidia binary
  12  * driver which does not support RandR in 2010 *sigh*.
  13  *
  14  */
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18
  19 #include <xcb/xcb.h>
  20 #include <xcb/xinerama.h>
  21
  22 #include "queue.h"
  23 #include "data.h"
  24 #include "util.h"
  25 #include "xinerama.h"
  26 #include "workspace.h"
  27 #include "log.h"
  28 #include "randr.h"
  29
  30 static int num_screens;
  31
  32 /*
  33  * Looks in outputs for the Output whose start coordinates are x, y
  34  *
  35  */
  36 static Output *get_screen_at(int x, int y) {
  37         Output *output;
  38         TAILQ_FOREACH(output, &outputs, outputs)
  39                 if (output->rect.x == x && output->rect.y == y)
  40                         return output;
  41
  42         return NULL;
  43 }
  44
  45 /*
  46  * Gets the Xinerama screens and converts them to virtual Outputs (only one screen for two
  47  * Xinerama screen which are configured in clone mode) in the given screenlist
  48  *
  49  */
  50 static void query_screens(xcb_connection_t *conn) {
  51         xcb_xinerama_query_screens_reply_t *reply;
  52         xcb_xinerama_screen_info_t *screen_info;
  53
  54         reply = xcb_xinerama_query_screens_reply(conn, xcb_xinerama_query_screens_unchecked(conn), NULL);
  55         if (!reply) {
  56                 ELOG("Couldn't get Xinerama screens\n");
  57                 return;
  58         }
  59         screen_info = xcb_xinerama_query_screens_screen_info(reply);
  60         int screens = xcb_xinerama_query_screens_screen_info_length(reply);
  61
  62         for (int screen = 0; screen < screens; screen++) {
  63                 Output *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org);
  64                 if (s != NULL) {
  65                         DLOG("Re-used old Xinerama screen %p\n", s);
  66                         /* This screen already exists. We use the littlest screen so that the user
  67                            can always see the complete workspace */
  68                         s->rect.width = min(s->rect.width, screen_info[screen].width);
  69                         s->rect.height = min(s->rect.height, screen_info[screen].height);
  70                 } else {
  71                         s = scalloc(sizeof(Output));
  72                         asprintf(&(s->name), "xinerama-%d", num_screens);
  73                         DLOG("Created new Xinerama screen %s (%p)\n", s->name, s);
  74                         s->active = true;
  75                         s->rect.x = screen_info[screen].x_org;
  76                         s->rect.y = screen_info[screen].y_org;
  77                         s->rect.width = screen_info[screen].width;
  78                         s->rect.height = screen_info[screen].height;
  79                         /* We always treat the screen at 0x0 as the primary screen */
  80                         if (s->rect.x == 0 && s->rect.y == 0)
  81                                 TAILQ_INSERT_HEAD(&outputs, s, outputs);
  82                         else TAILQ_INSERT_TAIL(&outputs, s, outputs);
  83                         num_screens++;
  84                 }
  85
  86                 DLOG("found Xinerama screen: %d x %d at %d x %d\n",
  87                                 screen_info[screen].width, screen_info[screen].height,
  88                                 screen_info[screen].x_org, screen_info[screen].y_org);
  89         }
  90
  91         free(reply);
  92
  93         if (num_screens == 0) {
  94                 ELOG("No screens found. Please fix your setup. i3 will exit now.\n");
  95                 exit(0);
  96         }
  97 }
  98
  99 /*
 100  * We have just established a connection to the X server and need the initial Xinerama
 101  * information to setup workspaces for each screen.
 102  *
 103  */
 104 void initialize_xinerama(xcb_connection_t *conn) {
 105         if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
 106                 DLOG("Xinerama extension not found, disabling.\n");
 107                 disable_randr(conn);
 108         } else {
 109                 xcb_xinerama_is_active_reply_t *reply;
 110                 reply = xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL);
 111
 112                 if (reply == NULL || !reply->state) {
 113                         DLOG("Xinerama is not active (in your X-Server), disabling.\n");
 114                         disable_randr(conn);
 115                 } else
 116                         query_screens(conn);
 117
 118                 FREE(reply);
 119         }
 120
 121         Output *output;
 122         Workspace *ws;
 123         /* Just go through each active output and associate one workspace */
 124         TAILQ_FOREACH(output, &outputs, outputs) {
 125                 ws = get_first_workspace_for_output(output);
 126                 initialize_output(conn, output, ws);
 127         }
 128 }