git.sur5r.net Git - i3/i3/blob - src/restore_layout.c

   1 #undef I3__FILE__
   2 #define I3__FILE__ "restore_layout.c"
   3 /*
   4  * vim:ts=4:sw=4:expandtab
   5  *
   6  * i3 - an improved dynamic tiling window manager
   7  * © 2009-2013 Michael Stapelberg and contributors (see also: LICENSE)
   8  *
   9  * restore_layout.c: Everything for restored containers that is not pure state
  10  *                   parsing (which can be found in load_layout.c).
  11  *
  12  *
  13  */
  14 #include "all.h"
  15
  16 typedef struct placeholder_state {
  17     /** The X11 placeholder window. */
  18     xcb_window_t window;
  19     /** The container to which this placeholder window belongs. */
  20     Con *con;
  21
  22     /** Current size of the placeholder window (to detect size changes). */
  23     Rect rect;
  24
  25     /** The pixmap to render on (back buffer). */
  26     xcb_pixmap_t pixmap;
  27     /** The graphics context for “pixmap”. */
  28     xcb_gcontext_t gc;
  29
  30     TAILQ_ENTRY(placeholder_state) state;
  31 } placeholder_state;
  32
  33 static TAILQ_HEAD(state_head, placeholder_state) state_head =
  34     TAILQ_HEAD_INITIALIZER(state_head);
  35
  36 static xcb_connection_t *restore_conn;
  37
  38 static struct ev_io *xcb_watcher;
  39 static struct ev_check *xcb_check;
  40 static struct ev_prepare *xcb_prepare;
  41
  42 static void restore_handle_event(int type, xcb_generic_event_t *event);
  43
  44 /* Documentation for these functions can be found in src/main.c, starting at xcb_got_event */
  45 static void restore_xcb_got_event(EV_P_ struct ev_io *w, int revents) {
  46 }
  47
  48 static void restore_xcb_prepare_cb(EV_P_ ev_prepare *w, int revents) {
  49     xcb_flush(restore_conn);
  50 }
  51
  52 static void restore_xcb_check_cb(EV_P_ ev_check *w, int revents) {
  53     xcb_generic_event_t *event;
  54
  55     if (xcb_connection_has_error(restore_conn)) {
  56         DLOG("restore X11 connection has an error, reconnecting\n");
  57         restore_connect();
  58         return;
  59     }
  60
  61     while ((event = xcb_poll_for_event(restore_conn)) != NULL) {
  62         if (event->response_type == 0) {
  63             xcb_generic_error_t *error = (xcb_generic_error_t *)event;
  64             DLOG("X11 Error received (probably harmless)! sequence 0x%x, error_code = %d\n",
  65                  error->sequence, error->error_code);
  66             free(event);
  67             continue;
  68         }
  69
  70         /* Strip off the highest bit (set if the event is generated) */
  71         int type = (event->response_type & 0x7F);
  72
  73         restore_handle_event(type, event);
  74
  75         free(event);
  76     }
  77 }
  78
  79 /*
  80  * Opens a separate connection to X11 for placeholder windows when restoring
  81  * layouts. This is done as a safety measure (users can xkill a placeholder
  82  * window without killing their window manager) and for better isolation, both
  83  * on the wire to X11 and thus also in the code.
  84  *
  85  */
  86 void restore_connect(void) {
  87     if (restore_conn != NULL) {
  88         /* This is not the initial connect, but a reconnect, most likely
  89          * because our X11 connection was killed (e.g. by a user with xkill. */
  90         ev_io_stop(main_loop, xcb_watcher);
  91         ev_check_stop(main_loop, xcb_check);
  92         ev_prepare_stop(main_loop, xcb_prepare);
  93
  94         placeholder_state *state;
  95         while (!TAILQ_EMPTY(&state_head)) {
  96             state = TAILQ_FIRST(&state_head);
  97             TAILQ_REMOVE(&state_head, state, state);
  98             free(state);
  99         }
 100
 101         free(restore_conn);
 102         free(xcb_watcher);
 103         free(xcb_check);
 104         free(xcb_prepare);
 105     }
 106
 107     int screen;
 108     restore_conn = xcb_connect(NULL, &screen);
 109     if (restore_conn == NULL || xcb_connection_has_error(restore_conn))
 110         errx(EXIT_FAILURE, "Cannot open display\n");
 111
 112     xcb_watcher = scalloc(sizeof(struct ev_io));
 113     xcb_check = scalloc(sizeof(struct ev_check));
 114     xcb_prepare = scalloc(sizeof(struct ev_prepare));
 115
 116     ev_io_init(xcb_watcher, restore_xcb_got_event, xcb_get_file_descriptor(restore_conn), EV_READ);
 117     ev_io_start(main_loop, xcb_watcher);
 118
 119     ev_check_init(xcb_check, restore_xcb_check_cb);
 120     ev_check_start(main_loop, xcb_check);
 121
 122     ev_prepare_init(xcb_prepare, restore_xcb_prepare_cb);
 123     ev_prepare_start(main_loop, xcb_prepare);
 124 }
 125
 126 static void update_placeholder_contents(placeholder_state *state) {
 127     xcb_change_gc(restore_conn, state->gc, XCB_GC_FOREGROUND,
 128                   (uint32_t[]){config.client.placeholder.background});
 129     xcb_poly_fill_rectangle(restore_conn, state->pixmap, state->gc, 1,
 130                             (xcb_rectangle_t[]){{0, 0, state->rect.width, state->rect.height}});
 131
 132     // TODO: make i3font functions per-connection, at least these two for now…?
 133     xcb_flush(restore_conn);
 134     xcb_aux_sync(restore_conn);
 135
 136     set_font_colors(state->gc, config.client.placeholder.text, config.client.placeholder.background);
 137
 138     Match *swallows;
 139     int n = 0;
 140     TAILQ_FOREACH(swallows, &(state->con->swallow_head), matches) {
 141         char *serialized = NULL;
 142
 143 #define APPEND_REGEX(re_name)                                                                                                                        \
 144     do {                                                                                                                                             \
 145         if (swallows->re_name != NULL) {                                                                                                             \
 146             sasprintf(&serialized, "%s%s" #re_name "=\"%s\"", (serialized ? serialized : "["), (serialized ? " " : ""), swallows->re_name->pattern); \
 147         }                                                                                                                                            \
 148     } while (0)
 149
 150         APPEND_REGEX(class);
 151         APPEND_REGEX(instance);
 152         APPEND_REGEX(window_role);
 153         APPEND_REGEX(title);
 154
 155         if (serialized == NULL) {
 156             DLOG("This swallows specification is not serializable?!\n");
 157             continue;
 158         }
 159
 160         sasprintf(&serialized, "%s]", serialized);
 161         DLOG("con %p (placeholder 0x%08x) line %d: %s\n", state->con, state->window, n, serialized);
 162
 163         i3String *str = i3string_from_utf8(serialized);
 164         draw_text(str, state->pixmap, state->gc, 2, (n * (config.font.height + 2)) + 2, state->rect.width - 2);
 165         i3string_free(str);
 166         n++;
 167         free(serialized);
 168     }
 169
 170     // TODO: render the watch symbol in a bigger font
 171     i3String *line = i3string_from_utf8("⌚");
 172     int text_width = predict_text_width(line);
 173     int x = (state->rect.width / 2) - (text_width / 2);
 174     int y = (state->rect.height / 2) - (config.font.height / 2);
 175     draw_text(line, state->pixmap, state->gc, x, y, text_width);
 176     i3string_free(line);
 177     xcb_flush(conn);
 178     xcb_aux_sync(conn);
 179 }
 180
 181 static void open_placeholder_window(Con *con) {
 182     if (con_is_leaf(con) &&
 183         (con->window == NULL || con->window->id == XCB_NONE) &&
 184         !TAILQ_EMPTY(&(con->swallow_head)) &&
 185         con->type == CT_CON) {
 186         xcb_window_t placeholder = create_window(
 187             restore_conn,
 188             con->rect,
 189             XCB_COPY_FROM_PARENT,
 190             XCB_COPY_FROM_PARENT,
 191             XCB_WINDOW_CLASS_INPUT_OUTPUT,
 192             XCURSOR_CURSOR_POINTER,
 193             true,
 194             XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK,
 195             (uint32_t[]){
 196                 config.client.placeholder.background,
 197                 XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_STRUCTURE_NOTIFY,
 198             });
 199         /* Set the same name as was stored in the layout file. While perhaps
 200          * slightly confusing in the first instant, this brings additional
 201          * clarity to which placeholder is waiting for which actual window. */
 202         if (con->name != NULL)
 203             xcb_change_property(restore_conn, XCB_PROP_MODE_REPLACE, placeholder,
 204                                 A__NET_WM_NAME, A_UTF8_STRING, 8, strlen(con->name), con->name);
 205         DLOG("Created placeholder window 0x%08x for leaf container %p / %s\n",
 206              placeholder, con, con->name);
 207
 208         placeholder_state *state = scalloc(sizeof(placeholder_state));
 209         state->window = placeholder;
 210         state->con = con;
 211         state->rect = con->rect;
 212         state->pixmap = xcb_generate_id(restore_conn);
 213         xcb_create_pixmap(restore_conn, root_depth, state->pixmap,
 214                           state->window, state->rect.width, state->rect.height);
 215         state->gc = xcb_generate_id(restore_conn);
 216         xcb_create_gc(restore_conn, state->gc, state->pixmap, XCB_GC_GRAPHICS_EXPOSURES, (uint32_t[]){0});
 217         update_placeholder_contents(state);
 218         TAILQ_INSERT_TAIL(&state_head, state, state);
 219
 220         /* create temporary id swallow to match the placeholder */
 221         Match *temp_id = smalloc(sizeof(Match));
 222         match_init(temp_id);
 223         temp_id->id = placeholder;
 224         TAILQ_INSERT_HEAD(&(con->swallow_head), temp_id, matches);
 225     }
 226
 227     Con *child;
 228     TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
 229         open_placeholder_window(child);
 230     }
 231     TAILQ_FOREACH(child, &(con->floating_head), floating_windows) {
 232         open_placeholder_window(child);
 233     }
 234 }
 235
 236 /*
 237  * Open placeholder windows for all children of parent. The placeholder window
 238  * will vanish as soon as a real window is swallowed by the container. Until
 239  * then, it exposes the criteria that must be fulfilled for a window to be
 240  * swallowed by this container.
 241  *
 242  */
 243 void restore_open_placeholder_windows(Con *parent) {
 244     Con *child;
 245     TAILQ_FOREACH(child, &(parent->nodes_head), nodes) {
 246         open_placeholder_window(child);
 247     }
 248     TAILQ_FOREACH(child, &(parent->floating_head), floating_windows) {
 249         open_placeholder_window(child);
 250     }
 251
 252     xcb_flush(restore_conn);
 253 }
 254
 255 /*
 256  * Kill the placeholder window, if placeholder refers to a placeholder window.
 257  * This function is called when manage.c puts a window into an existing
 258  * container. In order not to leak resources, we need to destroy the window and
 259  * all associated X11 objects (pixmap/gc).
 260  *
 261  */
 262 bool restore_kill_placeholder(xcb_window_t placeholder) {
 263     placeholder_state *state;
 264     TAILQ_FOREACH(state, &state_head, state) {
 265         if (state->window != placeholder)
 266             continue;
 267
 268         xcb_destroy_window(restore_conn, state->window);
 269         xcb_free_pixmap(restore_conn, state->pixmap);
 270         xcb_free_gc(restore_conn, state->gc);
 271         TAILQ_REMOVE(&state_head, state, state);
 272         free(state);
 273         DLOG("placeholder window 0x%08x destroyed.\n", placeholder);
 274         return true;
 275     }
 276
 277     DLOG("0x%08x is not a placeholder window, ignoring.\n", placeholder);
 278     return false;
 279 }
 280
 281 static void expose_event(xcb_expose_event_t *event) {
 282     placeholder_state *state;
 283     TAILQ_FOREACH(state, &state_head, state) {
 284         if (state->window != event->window)
 285             continue;
 286
 287         DLOG("refreshing window 0x%08x contents (con %p)\n", state->window, state->con);
 288
 289         /* Since we render to our pixmap on every change anyways, expose events
 290          * only tell us that the X server lost (parts of) the window contents. We
 291          * can handle that by copying the appropriate part from our pixmap to the
 292          * window. */
 293         xcb_copy_area(restore_conn, state->pixmap, state->window, state->gc,
 294                       event->x, event->y, event->x, event->y,
 295                       event->width, event->height);
 296         xcb_flush(restore_conn);
 297         return;
 298     }
 299
 300     ELOG("Received ExposeEvent for unknown window 0x%08x\n", event->window);
 301 }
 302
 303 /*
 304  * Window size has changed. Update the width/height, then recreate the back
 305  * buffer pixmap and the accompanying graphics context and force an immediate
 306  * re-rendering.
 307  *
 308  */
 309 static void configure_notify(xcb_configure_notify_event_t *event) {
 310     placeholder_state *state;
 311     TAILQ_FOREACH(state, &state_head, state) {
 312         if (state->window != event->window)
 313             continue;
 314
 315         DLOG("ConfigureNotify: window 0x%08x has now width=%d, height=%d (con %p)\n",
 316              state->window, event->width, event->height, state->con);
 317
 318         state->rect.width = event->width;
 319         state->rect.height = event->height;
 320
 321         xcb_free_pixmap(restore_conn, state->pixmap);
 322         xcb_free_gc(restore_conn, state->gc);
 323
 324         state->pixmap = xcb_generate_id(restore_conn);
 325         xcb_create_pixmap(restore_conn, root_depth, state->pixmap,
 326                           state->window, state->rect.width, state->rect.height);
 327         state->gc = xcb_generate_id(restore_conn);
 328         xcb_create_gc(restore_conn, state->gc, state->pixmap, XCB_GC_GRAPHICS_EXPOSURES, (uint32_t[]){0});
 329
 330         update_placeholder_contents(state);
 331         xcb_copy_area(restore_conn, state->pixmap, state->window, state->gc,
 332                       0, 0, 0, 0, state->rect.width, state->rect.height);
 333         xcb_flush(restore_conn);
 334         return;
 335     }
 336
 337     ELOG("Received ConfigureNotify for unknown window 0x%08x\n", event->window);
 338 }
 339
 340 static void restore_handle_event(int type, xcb_generic_event_t *event) {
 341     switch (type) {
 342         case XCB_EXPOSE:
 343             expose_event((xcb_expose_event_t *)event);
 344             break;
 345         case XCB_CONFIGURE_NOTIFY:
 346             configure_notify((xcb_configure_notify_event_t *)event);
 347             break;
 348         default:
 349             DLOG("Received unhandled X11 event of type %d\n", type);
 350             break;
 351     }
 352 }