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 Michael Stapelberg and contributors
   7  *
   8  * See file LICENSE for license information.
   9  *
  10  */
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <stdbool.h>
  15
  16 #include <xcb/xcb.h>
  17 #include <xcb/xinerama.h>
  18
  19 #include "queue.h"
  20 #include "i3.h"
  21 #include "data.h"
  22 #include "table.h"
  23 #include "util.h"
  24 #include "xinerama.h"
  25 #include "layout.h"
  26 #include "xcb.h"
  27 #include "font.h"
  28 #include "config.h"
  29
  30 /* This TAILQ of i3Screens stores the virtual screens, used for handling overlapping screens
  31  * (xrandr --same-as) */
  32 struct screens_head *virtual_screens;
  33
  34 static bool xinerama_enabled = true;
  35
  36 /*
  37  * Looks in virtual_screens for the i3Screen whose start coordinates are x, y
  38  *
  39  */
  40 i3Screen *get_screen_at(int x, int y, struct screens_head *screenlist) {
  41         i3Screen *screen;
  42         TAILQ_FOREACH(screen, screenlist, screens)
  43                 if (screen->rect.x == x && screen->rect.y == y)
  44                         return screen;
  45
  46         return NULL;
  47 }
  48
  49 /*
  50  * Looks in virtual_screens for the i3Screen which contains coordinates x, y
  51  *
  52  */
  53 i3Screen *get_screen_containing(int x, int y) {
  54         i3Screen *screen;
  55         TAILQ_FOREACH(screen, virtual_screens, screens) {
  56                 printf("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
  57                                 x, y, screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
  58                 if (x >= screen->rect.x && x < (screen->rect.x + screen->rect.width) &&
  59                     y >= screen->rect.y && y < (screen->rect.y + screen->rect.height))
  60                         return screen;
  61         }
  62
  63         return NULL;
  64 }
  65
  66 /*
  67  * Fills virtual_screens with exactly one screen with width/height of the whole X server.
  68  *
  69  */
  70 static void disable_xinerama(xcb_connection_t *connection) {
  71         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data;
  72
  73         i3Screen *s = calloc(sizeof(i3Screen), 1);
  74
  75         s->rect.x = 0;
  76         s->rect.y = 0;
  77         s->rect.width = root_screen->width_in_pixels;
  78         s->rect.height = root_screen->height_in_pixels;
  79
  80         TAILQ_INSERT_TAIL(virtual_screens, s, screens);
  81
  82         xinerama_enabled = false;
  83 }
  84
  85 /*
  86  * Gets the Xinerama screens and converts them to virtual i3Screens (only one screen for two
  87  * Xinerama screen which are configured in clone mode) in the given screenlist
  88  *
  89  */
  90 static void query_screens(xcb_connection_t *connection, struct screens_head *screenlist) {
  91         xcb_xinerama_query_screens_reply_t *reply;
  92         xcb_xinerama_screen_info_t *screen_info;
  93
  94         reply = xcb_xinerama_query_screens_reply(connection, xcb_xinerama_query_screens_unchecked(connection), NULL);
  95         if (!reply) {
  96                 printf("Couldn't get Xinerama screens\n");
  97                 return;
  98         }
  99         screen_info = xcb_xinerama_query_screens_screen_info(reply);
 100         int screens = xcb_xinerama_query_screens_screen_info_length(reply);
 101         num_screens = 0;
 102
 103         for (int screen = 0; screen < screens; screen++) {
 104                 i3Screen *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org, screenlist);
 105                 if (s!= NULL) {
 106                         /* This screen already exists. We use the littlest screen so that the user
 107                            can always see the complete workspace */
 108                         s->rect.width = min(s->rect.width, screen_info[screen].width);
 109                         s->rect.height = min(s->rect.height, screen_info[screen].height);
 110                 } else {
 111                         s = calloc(sizeof(i3Screen), 1);
 112                         s->rect.x = screen_info[screen].x_org;
 113                         s->rect.y = screen_info[screen].y_org;
 114                         s->rect.width = screen_info[screen].width;
 115                         s->rect.height = screen_info[screen].height;
 116                         /* We always treat the screen at 0x0 as the primary screen */
 117                         if (s->rect.x == 0 && s->rect.y == 0)
 118                                 TAILQ_INSERT_HEAD(screenlist, s, screens);
 119                         else TAILQ_INSERT_TAIL(screenlist, s, screens);
 120                         num_screens++;
 121                 }
 122
 123                 printf("found Xinerama screen: %d x %d at %d x %d\n",
 124                                 screen_info[screen].width, screen_info[screen].height,
 125                                 screen_info[screen].x_org, screen_info[screen].y_org);
 126         }
 127
 128         free(reply);
 129 }
 130
 131 static void initialize_screen(xcb_connection_t *connection, i3Screen *screen, Workspace *workspace) {
 132         i3Font *font = load_font(connection, config.font);
 133
 134         workspace->screen = screen;
 135         screen->current_workspace = workspace->num;
 136
 137         /* Create a bar for each screen */
 138         Rect bar_rect = {screen->rect.x,
 139                          screen->rect.height - (font->height + 6),
 140                          screen->rect.x + screen->rect.width,
 141                          font->height + 6};
 142         uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
 143         uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE};
 144         screen->bar = create_window(connection, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, mask, values);
 145         screen->bargc = xcb_generate_id(connection);
 146         xcb_create_gc(connection, screen->bargc, screen->bar, 0, 0);
 147
 148         /* Copy dimensions */
 149         memcpy(&(workspace->rect), &(screen->rect), sizeof(Rect));
 150         printf("that is virtual screen at %d x %d with %d x %d\n",
 151                         screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
 152 }
 153
 154 /*
 155  * We have just established a connection to the X server and need the initial Xinerama
 156  * information to setup workspaces for each screen.
 157  *
 158  */
 159 void initialize_xinerama(xcb_connection_t *connection) {
 160         virtual_screens = scalloc(sizeof(struct screens_head));
 161         TAILQ_INIT(virtual_screens);
 162
 163         if (!xcb_get_extension_data(connection, &xcb_xinerama_id)->present) {
 164                 printf("Xinerama extension not found, disabling.\n");
 165                 disable_xinerama(connection);
 166                 return;
 167         }
 168
 169         if (!xcb_xinerama_is_active_reply(connection, xcb_xinerama_is_active(connection), NULL)->state) {
 170                 printf("Xinerama is not active (in your X-Server), disabling.\n");
 171                 disable_xinerama(connection);
 172                 return;
 173         }
 174
 175         query_screens(connection, virtual_screens);
 176
 177         i3Screen *s;
 178         num_screens = 0;
 179         /* Just go through each workspace and associate as many screens as we can. */
 180         TAILQ_FOREACH(s, virtual_screens, screens) {
 181                 s->num = num_screens;
 182                 initialize_screen(connection, s, &(workspaces[num_screens]));
 183                 num_screens++;
 184         }
 185 }
 186
 187 /*
 188  * This is called when the rootwindow receives a configure_notify event and therefore the
 189  * number/position of the Xinerama screens could have changed.
 190  *
 191  */
 192 void xinerama_requery_screens(xcb_connection_t *connection) {
 193         /* POSSIBLE PROBLEM: Is the order of the Xinerama screens always constant? That is, can
 194            it change when I move the --right-of video projector to --left-of? */
 195
 196         if (!xinerama_enabled) {
 197                 printf("Xinerama is disabled\n");
 198                 return;
 199         }
 200
 201         /* We use a separate copy to diff with the previous set of screens */
 202         struct screens_head *new_screens = scalloc(sizeof(struct screens_head));
 203         TAILQ_INIT(new_screens);
 204
 205         query_screens(connection, new_screens);
 206
 207         i3Screen *first = TAILQ_FIRST(new_screens),
 208                  *screen;
 209         int screen_count = 0;
 210         TAILQ_FOREACH(screen, new_screens, screens) {
 211                 screen->num = screen_count;
 212                 screen->current_workspace = -1;
 213                 for (int c = 0; c < 10; c++)
 214                         if ((workspaces[c].screen != NULL) &&
 215                             (workspaces[c].screen->num == screen_count)) {
 216                                 printf("Found a matching screen\n");
 217                                 /* Try to use the same workspace, if it’s available */
 218                                 if (workspaces[c].screen->current_workspace)
 219                                         screen->current_workspace = workspaces[c].screen->current_workspace;
 220
 221                                 if (screen->current_workspace == -1)
 222                                         screen->current_workspace = c;
 223
 224                                 /* Re-use the old bar window */
 225                                 screen->bar = workspaces[c].screen->bar;
 226                                 screen->bargc = workspaces[c].screen->bargc;
 227
 228                                 /* Update the dimensions */
 229                                 memcpy(&(workspaces[c].rect), &(screen->rect), sizeof(Rect));
 230                                 workspaces[c].screen = screen;
 231                         }
 232                 if (screen->current_workspace == -1) {
 233                         /* Create a new workspace for this screen, it’s new */
 234                         for (int c = 0; c < 10; c++)
 235                                 if (workspaces[c].screen == NULL) {
 236                                         printf("fix: initializing new workspace, setting num to %d\n", c);
 237                                         initialize_screen(connection, screen, &(workspaces[c]));
 238                                         break;
 239                                 }
 240                 }
 241                 screen_count++;
 242         }
 243
 244         /* Check for workspaces which are out of bounds */
 245         for (int c = 0; c < 10; c++)
 246                 if ((workspaces[c].screen != NULL) &&
 247                     (workspaces[c].screen->num >= num_screens)) {
 248                         printf("Closing bar window\n");
 249                         xcb_destroy_window(connection, workspaces[c].screen->bar);
 250
 251                         printf("Workspace %d's screen out of bounds, assigning to first screen\n", c+1);
 252                         workspaces[c].screen = first;
 253                         memcpy(&(workspaces[c].rect), &(first->rect), sizeof(Rect));
 254                 }
 255
 256         /* Free the old list */
 257         TAILQ_FOREACH(screen, virtual_screens, screens) {
 258                 TAILQ_REMOVE(virtual_screens, screen, screens);
 259                 free(screen);
 260         }
 261         free(virtual_screens);
 262
 263         virtual_screens = new_screens;
 264
 265         printf("Current workspace is now: %d\n", first->current_workspace);
 266
 267         render_layout(connection);
 268 }