]> git.sur5r.net Git - i3/i3/blob - src/xinerama.c
8d00eb4cddff02205d7f8a9fee4c6161d5e9fc24
[i3/i3] / 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 #include <assert.h>
16
17 #include <xcb/xcb.h>
18 #include <xcb/xinerama.h>
19
20 #include "queue.h"
21 #include "i3.h"
22 #include "data.h"
23 #include "table.h"
24 #include "util.h"
25 #include "xinerama.h"
26 #include "layout.h"
27 #include "xcb.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                 LOG("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  * Gets the screen which is the last one in the given direction, for example the screen
68  * on the most bottom when direction == D_DOWN, the screen most right when direction == D_RIGHT
69  * and so on.
70  *
71  * This function always returns a screen.
72  *
73  */
74 i3Screen *get_screen_most(direction_t direction) {
75         i3Screen *screen, *candidate = NULL;
76         int position = 0;
77         TAILQ_FOREACH(screen, virtual_screens, screens) {
78                 /* Repeated calls of WIN determine the winner of the comparison */
79                 #define WIN(variable, condition) \
80                         if (variable condition) { \
81                                 candidate = screen; \
82                                 position = variable; \
83                         } \
84                         break;
85
86                 switch (direction) {
87                         case D_UP:
88                                 WIN(screen->rect.y, <= position);
89                         case D_DOWN:
90                                 WIN(screen->rect.y, >= position);
91                         case D_LEFT:
92                                 WIN(screen->rect.x, <= position);
93                         case D_RIGHT:
94                                 WIN(screen->rect.x, >= position);
95                 }
96         }
97
98         assert(candidate != NULL);
99
100         return candidate;
101 }
102
103 /*
104  * Fills virtual_screens with exactly one screen with width/height of the whole X server.
105  *
106  */
107 static void disable_xinerama(xcb_connection_t *conn) {
108         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
109
110         i3Screen *s = calloc(sizeof(i3Screen), 1);
111
112         s->rect.x = 0;
113         s->rect.y = 0;
114         s->rect.width = root_screen->width_in_pixels;
115         s->rect.height = root_screen->height_in_pixels;
116
117         TAILQ_INSERT_TAIL(virtual_screens, s, screens);
118
119         xinerama_enabled = false;
120 }
121
122 /*
123  * Gets the Xinerama screens and converts them to virtual i3Screens (only one screen for two
124  * Xinerama screen which are configured in clone mode) in the given screenlist
125  *
126  */
127 static void query_screens(xcb_connection_t *conn, struct screens_head *screenlist) {
128         xcb_xinerama_query_screens_reply_t *reply;
129         xcb_xinerama_screen_info_t *screen_info;
130
131         reply = xcb_xinerama_query_screens_reply(conn, xcb_xinerama_query_screens_unchecked(conn), NULL);
132         if (!reply) {
133                 LOG("Couldn't get Xinerama screens\n");
134                 return;
135         }
136         screen_info = xcb_xinerama_query_screens_screen_info(reply);
137         int screens = xcb_xinerama_query_screens_screen_info_length(reply);
138         num_screens = 0;
139
140         for (int screen = 0; screen < screens; screen++) {
141                 i3Screen *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org, screenlist);
142                 if (s!= NULL) {
143                         /* This screen already exists. We use the littlest screen so that the user
144                            can always see the complete workspace */
145                         s->rect.width = min(s->rect.width, screen_info[screen].width);
146                         s->rect.height = min(s->rect.height, screen_info[screen].height);
147                 } else {
148                         s = calloc(sizeof(i3Screen), 1);
149                         s->rect.x = screen_info[screen].x_org;
150                         s->rect.y = screen_info[screen].y_org;
151                         s->rect.width = screen_info[screen].width;
152                         s->rect.height = screen_info[screen].height;
153                         /* We always treat the screen at 0x0 as the primary screen */
154                         if (s->rect.x == 0 && s->rect.y == 0)
155                                 TAILQ_INSERT_HEAD(screenlist, s, screens);
156                         else TAILQ_INSERT_TAIL(screenlist, s, screens);
157                         num_screens++;
158                 }
159
160                 LOG("found Xinerama screen: %d x %d at %d x %d\n",
161                                 screen_info[screen].width, screen_info[screen].height,
162                                 screen_info[screen].x_org, screen_info[screen].y_org);
163         }
164
165         free(reply);
166 }
167
168 static void initialize_screen(xcb_connection_t *conn, i3Screen *screen, Workspace *workspace) {
169         i3Font *font = load_font(conn, config.font);
170
171         workspace->screen = screen;
172         screen->current_workspace = workspace->num;
173
174         /* Create a bar for each screen */
175         Rect bar_rect = {screen->rect.x,
176                          screen->rect.height - (font->height + 6),
177                          screen->rect.x + screen->rect.width,
178                          font->height + 6};
179         uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
180         uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
181         screen->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, mask, values);
182         screen->bargc = xcb_generate_id(conn);
183         xcb_create_gc(conn, screen->bargc, screen->bar, 0, 0);
184
185         /* Copy dimensions */
186         memcpy(&(workspace->rect), &(screen->rect), sizeof(Rect));
187         LOG("that is virtual screen at %d x %d with %d x %d\n",
188                         screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
189 }
190
191 /*
192  * We have just established a connection to the X server and need the initial Xinerama
193  * information to setup workspaces for each screen.
194  *
195  */
196 void initialize_xinerama(xcb_connection_t *conn) {
197         virtual_screens = scalloc(sizeof(struct screens_head));
198         TAILQ_INIT(virtual_screens);
199
200         if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
201                 LOG("Xinerama extension not found, disabling.\n");
202                 disable_xinerama(conn);
203                 return;
204         }
205
206         xcb_xinerama_is_active_reply_t *reply;
207         reply = xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL);
208
209         if (!reply->state) {
210                 LOG("Xinerama is not active (in your X-Server), disabling.\n");
211                 free(reply);
212                 disable_xinerama(conn);
213                 return;
214         }
215
216         free(reply);
217
218         query_screens(conn, virtual_screens);
219
220         i3Screen *s;
221         num_screens = 0;
222         /* Just go through each workspace and associate as many screens as we can. */
223         TAILQ_FOREACH(s, virtual_screens, screens) {
224                 s->num = num_screens;
225                 initialize_screen(conn, s, &(workspaces[num_screens]));
226                 num_screens++;
227         }
228 }
229
230 /*
231  * This is called when the rootwindow receives a configure_notify event and therefore the
232  * number/position of the Xinerama screens could have changed.
233  *
234  */
235 void xinerama_requery_screens(xcb_connection_t *conn) {
236         /* POSSIBLE PROBLEM: Is the order of the Xinerama screens always constant? That is, can
237            it change when I move the --right-of video projector to --left-of? */
238
239         if (!xinerama_enabled) {
240                 LOG("Xinerama is disabled\n");
241                 return;
242         }
243
244         /* We use a separate copy to diff with the previous set of screens */
245         struct screens_head *new_screens = scalloc(sizeof(struct screens_head));
246         TAILQ_INIT(new_screens);
247
248         query_screens(conn, new_screens);
249
250         i3Screen *first = TAILQ_FIRST(new_screens),
251                  *screen;
252         int screen_count = 0;
253         TAILQ_FOREACH(screen, new_screens, screens) {
254                 screen->num = screen_count;
255                 screen->current_workspace = -1;
256                 for (int c = 0; c < 10; c++)
257                         if ((workspaces[c].screen != NULL) &&
258                             (workspaces[c].screen->num == screen_count)) {
259                                 LOG("Found a matching screen\n");
260                                 /* Try to use the same workspace, if it’s available */
261                                 if (workspaces[c].screen->current_workspace)
262                                         screen->current_workspace = workspaces[c].screen->current_workspace;
263
264                                 if (screen->current_workspace == -1)
265                                         screen->current_workspace = c;
266
267                                 /* Re-use the old bar window */
268                                 screen->bar = workspaces[c].screen->bar;
269                                 screen->bargc = workspaces[c].screen->bargc;
270
271                                 /* Update the dimensions */
272                                 memcpy(&(workspaces[c].rect), &(screen->rect), sizeof(Rect));
273                                 workspaces[c].screen = screen;
274                         }
275                 if (screen->current_workspace == -1) {
276                         /* Create a new workspace for this screen, it’s new */
277                         for (int c = 0; c < 10; c++)
278                                 if (workspaces[c].screen == NULL) {
279                                         LOG("fix: initializing new workspace, setting num to %d\n", c);
280                                         initialize_screen(conn, screen, &(workspaces[c]));
281                                         break;
282                                 }
283                 }
284                 screen_count++;
285         }
286
287         /* Check for workspaces which are out of bounds */
288         for (int c = 0; c < 10; c++)
289                 if ((workspaces[c].screen != NULL) &&
290                     (workspaces[c].screen->num >= num_screens)) {
291                         LOG("Closing bar window\n");
292                         xcb_destroy_window(conn, workspaces[c].screen->bar);
293
294                         LOG("Workspace %d's screen out of bounds, assigning to first screen\n", c+1);
295                         workspaces[c].screen = first;
296                         memcpy(&(workspaces[c].rect), &(first->rect), sizeof(Rect));
297                 }
298
299         /* Free the old list */
300         while (!TAILQ_EMPTY(virtual_screens)) {
301                 screen = TAILQ_FIRST(virtual_screens);
302                 TAILQ_REMOVE(virtual_screens, screen, screens);
303                 free(screen);
304         }
305         free(virtual_screens);
306
307         virtual_screens = new_screens;
308
309         LOG("Current workspace is now: %d\n", first->current_workspace);
310
311         render_layout(conn);
312 }