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 void restore_handle_event(int type, xcb_generic_event_t *event);
  39
  40 /* Documentation for these functions can be found in src/main.c, starting at xcb_got_event */
  41 static void restore_xcb_got_event(EV_P_ struct ev_io *w, int revents) {
  42 }
  43
  44 static void restore_xcb_prepare_cb(EV_P_ ev_prepare *w, int revents) {
  45     xcb_flush(restore_conn);
  46 }
  47
  48 static void restore_xcb_check_cb(EV_P_ ev_check *w, int revents) {
  49     xcb_generic_event_t *event;
  50
  51     if (xcb_connection_has_error(restore_conn)) {
  52         // TODO: figure out how to reconnect with libev
  53         ELOG("connection has an error\n");
  54         return;
  55     }
  56
  57     while ((event = xcb_poll_for_event(restore_conn)) != NULL) {
  58         if (event->response_type == 0) {
  59             xcb_generic_error_t *error = (xcb_generic_error_t*)event;
  60             DLOG("X11 Error received (probably harmless)! sequence 0x%x, error_code = %d\n",
  61                  error->sequence, error->error_code);
  62             free(event);
  63             continue;
  64         }
  65
  66         /* Strip off the highest bit (set if the event is generated) */
  67         int type = (event->response_type & 0x7F);
  68
  69         restore_handle_event(type, event);
  70
  71         free(event);
  72     }
  73 }
  74
  75 /*
  76  * Opens a separate connection to X11 for placeholder windows when restoring
  77  * layouts. This is done as a safety measure (users can xkill a placeholder
  78  * window without killing their window manager) and for better isolation, both
  79  * on the wire to X11 and thus also in the code.
  80  *
  81  */
  82 void restore_connect(void) {
  83     int screen;
  84     restore_conn = xcb_connect(NULL, &screen);
  85     if (restore_conn == NULL || xcb_connection_has_error(restore_conn))
  86         errx(EXIT_FAILURE, "Cannot open display\n");
  87
  88     struct ev_io *xcb_watcher = scalloc(sizeof(struct ev_io));
  89     struct ev_check *xcb_check = scalloc(sizeof(struct ev_check));
  90     struct ev_prepare *xcb_prepare = scalloc(sizeof(struct ev_prepare));
  91
  92     ev_io_init(xcb_watcher, restore_xcb_got_event, xcb_get_file_descriptor(restore_conn), EV_READ);
  93     ev_io_start(main_loop, xcb_watcher);
  94
  95     ev_check_init(xcb_check, restore_xcb_check_cb);
  96     ev_check_start(main_loop, xcb_check);
  97
  98     ev_prepare_init(xcb_prepare, restore_xcb_prepare_cb);
  99     ev_prepare_start(main_loop, xcb_prepare);
 100 }
 101
 102 static void update_placeholder_contents(placeholder_state *state) {
 103     // TODO: introduce color configuration for placeholder windows.
 104     xcb_change_gc(restore_conn, state->gc, XCB_GC_FOREGROUND, (uint32_t[]) { config.client.background });
 105     xcb_poly_fill_rectangle(restore_conn, state->pixmap, state->gc, 1,
 106             (xcb_rectangle_t[]) { { 0, 0, state->rect.width, state->rect.height } });
 107
 108     // TODO: make i3font functions per-connection, at least these two for now…?
 109     xcb_flush(restore_conn);
 110     xcb_aux_sync(restore_conn);
 111
 112     set_font_colors(state->gc, config.client.focused.background, 0);
 113
 114     Match *swallows;
 115     int n = 0;
 116     TAILQ_FOREACH(swallows, &(state->con->swallow_head), matches) {
 117         char *serialized = NULL;
 118
 119 #define APPEND_REGEX(re_name) do { \
 120     if (swallows->re_name != NULL) { \
 121         sasprintf(&serialized, "%s%s" #re_name "=\"%s\"", \
 122                   (serialized ? serialized : "["), \
 123                   (serialized ? " " : ""), \
 124                   swallows->re_name->pattern); \
 125     } \
 126 } while (0)
 127
 128         APPEND_REGEX(class);
 129         APPEND_REGEX(instance);
 130         APPEND_REGEX(window_role);
 131         APPEND_REGEX(title);
 132
 133         if (serialized == NULL) {
 134             DLOG("This swallows specification is not serializable?!\n");
 135             continue;
 136         }
 137
 138         sasprintf(&serialized, "%s]", serialized);
 139         DLOG("con %p (placeholder 0x%08x) line %d: %s\n", state->con, state->window, n, serialized);
 140
 141         i3String *str = i3string_from_utf8(serialized);
 142         draw_text(str, state->pixmap, state->gc, 2, (n * (config.font.height + 2)) + 2, state->rect.width - 2);
 143         i3string_free(str);
 144         n++;
 145         free(serialized);
 146     }
 147
 148     // TODO: render the watch symbol in a bigger font
 149     i3String *line = i3string_from_utf8("⌚");
 150     int text_width = predict_text_width(line);
 151     int x = (state->rect.width / 2) - (text_width / 2);
 152     int y = (state->rect.height / 2) - (config.font.height / 2);
 153     draw_text(line, state->pixmap, state->gc, x, y, text_width);
 154     i3string_free(line);
 155     xcb_flush(conn);
 156     xcb_aux_sync(conn);
 157 }
 158
 159 static void open_placeholder_window(Con *con) {
 160     if (con_is_leaf(con)) {
 161         xcb_window_t placeholder = create_window(
 162                 restore_conn,
 163                 con->rect,
 164                 XCB_COPY_FROM_PARENT,
 165                 XCB_COPY_FROM_PARENT,
 166                 XCB_WINDOW_CLASS_INPUT_OUTPUT,
 167                 XCURSOR_CURSOR_POINTER,
 168                 true,
 169                 XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK,
 170                 (uint32_t[]){
 171                     // TODO: use the background color as background pixel to avoid flickering
 172                     root_screen->white_pixel,
 173                     XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_STRUCTURE_NOTIFY,
 174                 });
 175         // TODO: set window title from con->name
 176         DLOG("Created placeholder window 0x%08x for leaf container %p / %s\n",
 177              placeholder, con, con->name);
 178
 179         placeholder_state *state = scalloc(sizeof(placeholder_state));
 180         state->window = placeholder;
 181         state->con = con;
 182         state->rect = con->rect;
 183         state->pixmap = xcb_generate_id(restore_conn);
 184         xcb_create_pixmap(restore_conn, root_depth, state->pixmap,
 185                           state->window, state->rect.width, state->rect.height);
 186         state->gc = xcb_generate_id(restore_conn);
 187         xcb_create_gc(restore_conn, state->gc, state->pixmap, XCB_GC_GRAPHICS_EXPOSURES, (uint32_t[]){ 0 });
 188         update_placeholder_contents(state);
 189         TAILQ_INSERT_TAIL(&state_head, state, state);
 190
 191         /* create temporary id swallow to match the placeholder */
 192         Match *temp_id = smalloc(sizeof(Match));
 193         match_init(temp_id);
 194         temp_id->id = placeholder;
 195         TAILQ_INSERT_TAIL(&(con->swallow_head), temp_id, matches);
 196     }
 197
 198     Con *child;
 199     TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
 200         open_placeholder_window(child);
 201     }
 202     TAILQ_FOREACH(child, &(con->floating_head), floating_windows) {
 203         open_placeholder_window(child);
 204     }
 205 }
 206
 207 /*
 208  * Open placeholder windows for all children of parent. The placeholder window
 209  * will vanish as soon as a real window is swallowed by the container. Until
 210  * then, it exposes the criteria that must be fulfilled for a window to be
 211  * swallowed by this container.
 212  *
 213  */
 214 void restore_open_placeholder_windows(Con *parent) {
 215     Con *child;
 216     TAILQ_FOREACH(child, &(parent->nodes_head), nodes) {
 217         open_placeholder_window(child);
 218     }
 219     TAILQ_FOREACH(child, &(parent->floating_head), floating_windows) {
 220         open_placeholder_window(child);
 221     }
 222
 223     xcb_flush(restore_conn);
 224 }
 225
 226 static void expose_event(xcb_expose_event_t *event) {
 227     placeholder_state *state;
 228     TAILQ_FOREACH(state, &state_head, state) {
 229         if (state->window != event->window)
 230             continue;
 231
 232         DLOG("refreshing window 0x%08x contents (con %p)\n", state->window, state->con);
 233
 234         /* Since we render to our pixmap on every change anyways, expose events
 235          * only tell us that the X server lost (parts of) the window contents. We
 236          * can handle that by copying the appropriate part from our pixmap to the
 237          * window. */
 238         xcb_copy_area(restore_conn, state->pixmap, state->window, state->gc,
 239                       event->x, event->y, event->x, event->y,
 240                       event->width, event->height);
 241         xcb_flush(restore_conn);
 242         return;
 243     }
 244
 245     ELOG("Received ExposeEvent for unknown window 0x%08x\n", event->window);
 246 }
 247
 248 /*
 249  * Window size has changed. Update the width/height, then recreate the back
 250  * buffer pixmap and the accompanying graphics context and force an immediate
 251  * re-rendering.
 252  *
 253  */
 254 static void configure_notify(xcb_configure_notify_event_t *event) {
 255     placeholder_state *state;
 256     TAILQ_FOREACH(state, &state_head, state) {
 257         if (state->window != event->window)
 258             continue;
 259
 260         DLOG("ConfigureNotify: window 0x%08x has now width=%d, height=%d (con %p)\n",
 261              state->window, event->width, event->height, state->con);
 262
 263         state->rect.width = event->width;
 264         state->rect.height = event->height;
 265
 266         xcb_free_pixmap(restore_conn, state->pixmap);
 267         xcb_free_gc(restore_conn, state->gc);
 268
 269         state->pixmap = xcb_generate_id(restore_conn);
 270         xcb_create_pixmap(restore_conn, root_depth, state->pixmap,
 271                           state->window, state->rect.width, state->rect.height);
 272         state->gc = xcb_generate_id(restore_conn);
 273         xcb_create_gc(restore_conn, state->gc, state->pixmap, XCB_GC_GRAPHICS_EXPOSURES, (uint32_t[]){ 0 });
 274
 275         update_placeholder_contents(state);
 276         xcb_copy_area(restore_conn, state->pixmap, state->window, state->gc,
 277                       0, 0, 0, 0, state->rect.width, state->rect.height);
 278         xcb_flush(restore_conn);
 279         return;
 280     }
 281
 282     ELOG("Received ConfigureNotify for unknown window 0x%08x\n", event->window);
 283 }
 284
 285 // TODO: this event loop is not taken care of in the floating event handler
 286 static void restore_handle_event(int type, xcb_generic_event_t *event) {
 287     switch (type) {
 288         case XCB_EXPOSE:
 289             expose_event((xcb_expose_event_t*)event);
 290             break;
 291         case XCB_CONFIGURE_NOTIFY:
 292             configure_notify((xcb_configure_notify_event_t*)event);
 293             break;
 294         default:
 295             DLOG("Received unhandled X11 event of type %d\n", type);
 296             break;
 297     }
 298 }