i3
src/xinerama.c
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00001 /*
00002  * vim:ts=4:sw=4:expandtab
00003  *
00004  * i3 - an improved dynamic tiling window manager
00005  *
00006  * © 2009-2011 Michael Stapelberg and contributors
00007  *
00008  * See file LICENSE for license information.
00009  *
00010  * This is LEGACY code (we support RandR, which can do much more than
00011  * Xinerama), but necessary for the poor users of the nVidia binary
00012  * driver which does not support RandR in 2010 *sigh*.
00013  *
00014  */
00015 
00016 #include <xcb/xinerama.h>
00017 
00018 #include "all.h"
00019 
00020 static int num_screens;
00021 
00022 /*
00023  * Looks in outputs for the Output whose start coordinates are x, y
00024  *
00025  */
00026 static Output *get_screen_at(int x, int y) {
00027     Output *output;
00028     TAILQ_FOREACH(output, &outputs, outputs)
00029         if (output->rect.x == x && output->rect.y == y)
00030             return output;
00031 
00032     return NULL;
00033 }
00034 
00035 /*
00036  * Gets the Xinerama screens and converts them to virtual Outputs (only one screen for two
00037  * Xinerama screen which are configured in clone mode) in the given screenlist
00038  *
00039  */
00040 static void query_screens(xcb_connection_t *conn) {
00041     xcb_xinerama_query_screens_reply_t *reply;
00042     xcb_xinerama_screen_info_t *screen_info;
00043 
00044     reply = xcb_xinerama_query_screens_reply(conn, xcb_xinerama_query_screens_unchecked(conn), NULL);
00045     if (!reply) {
00046         ELOG("Couldn't get Xinerama screens\n");
00047         return;
00048     }
00049     screen_info = xcb_xinerama_query_screens_screen_info(reply);
00050     int screens = xcb_xinerama_query_screens_screen_info_length(reply);
00051 
00052     for (int screen = 0; screen < screens; screen++) {
00053         Output *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org);
00054         if (s != NULL) {
00055             DLOG("Re-used old Xinerama screen %p\n", s);
00056             /* This screen already exists. We use the littlest screen so that the user
00057                can always see the complete workspace */
00058             s->rect.width = min(s->rect.width, screen_info[screen].width);
00059             s->rect.height = min(s->rect.height, screen_info[screen].height);
00060         } else {
00061             s = scalloc(sizeof(Output));
00062             asprintf(&(s->name), "xinerama-%d", num_screens);
00063             DLOG("Created new Xinerama screen %s (%p)\n", s->name, s);
00064             s->active = true;
00065             s->rect.x = screen_info[screen].x_org;
00066             s->rect.y = screen_info[screen].y_org;
00067             s->rect.width = screen_info[screen].width;
00068             s->rect.height = screen_info[screen].height;
00069             /* We always treat the screen at 0x0 as the primary screen */
00070             if (s->rect.x == 0 && s->rect.y == 0)
00071                     TAILQ_INSERT_HEAD(&outputs, s, outputs);
00072             else TAILQ_INSERT_TAIL(&outputs, s, outputs);
00073             output_init_con(s);
00074             init_ws_for_output(s, output_get_content(s->con));
00075             num_screens++;
00076         }
00077 
00078         DLOG("found Xinerama screen: %d x %d at %d x %d\n",
00079                         screen_info[screen].width, screen_info[screen].height,
00080                         screen_info[screen].x_org, screen_info[screen].y_org);
00081     }
00082 
00083     free(reply);
00084 
00085     if (num_screens == 0) {
00086         ELOG("No screens found. Please fix your setup. i3 will exit now.\n");
00087         exit(0);
00088     }
00089 }
00090 
00091 /*
00092  * We have just established a connection to the X server and need the initial Xinerama
00093  * information to setup workspaces for each screen.
00094  *
00095  */
00096 void xinerama_init() {
00097     if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
00098         DLOG("Xinerama extension not found, disabling.\n");
00099         disable_randr(conn);
00100     } else {
00101         xcb_xinerama_is_active_reply_t *reply;
00102         reply = xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL);
00103 
00104         if (reply == NULL || !reply->state) {
00105             DLOG("Xinerama is not active (in your X-Server), disabling.\n");
00106             disable_randr(conn);
00107         } else
00108             query_screens(conn);
00109 
00110         FREE(reply);
00111     }
00112 
00113 #if 0
00114     Output *output;
00115     Workspace *ws;
00116     /* Just go through each active output and associate one workspace */
00117     TAILQ_FOREACH(output, &outputs, outputs) {
00118         ws = get_first_workspace_for_output(output);
00119         initialize_output(conn, output, ws);
00120     }
00121 #endif
00122 }