screen.c

   1 #include "screen.h"
   2 #include "display.h"
   3 #include "list.h"
   4 #include "time.h"
   5 #include "window.h"
   6 #include "render.h"
   7 #include "gettext.h"
   8 #include <string.h>
   9 #include <stdlib.h>
  10 #include <stdio.h>
  11 #include <xcb/composite.h>
  12
  13 #define ROOT_MASK      (XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY | \
  14                         XCB_EVENT_MASK_STRUCTURE_NOTIFY)
  15
  16 #define SELECTION_MASK (XCB_EVENT_MASK_STRUCTURE_NOTIFY | \
  17                         XCB_EVENT_MASK_PROPERTY_CHANGE)
  18
  19 static gboolean screen_init(d_screen_t *sc);
  20 static xcb_timestamp_t screen_timestamp(d_screen_t *sc);
  21 static void screen_add_existing_windows(d_screen_t *sc);
  22
  23 gboolean
  24 screen_register(struct d_display *dpy, int num, d_screen_t *sc)
  25 {
  26     char *name;
  27     xcb_window_t w;
  28     xcb_intern_atom_cookie_t ack;
  29     xcb_intern_atom_reply_t *arep;
  30     xcb_get_selection_owner_cookie_t sck;
  31     xcb_get_selection_owner_reply_t *srep;
  32     uint32_t event_mask;
  33     gboolean taken, ret;
  34
  35     sc->dpy = dpy;
  36     sc->num = num;
  37     w = xcb_generate_id(sc->dpy->conn);
  38     event_mask = SELECTION_MASK;
  39     xcb_create_window(sc->dpy->conn, XCB_COPY_FROM_PARENT, w, sc->super.root,
  40                       0, 0, 1, 1, 0, XCB_WINDOW_CLASS_INPUT_ONLY,
  41                       sc->super.root_visual, XCB_CW_EVENT_MASK, &event_mask);
  42
  43     name = g_strdup_printf("_NET_WM_CM_S%d", sc->num);
  44     ack = xcb_intern_atom(sc->dpy->conn, FALSE, strlen(name), name);
  45     arep = xcb_intern_atom_reply(sc->dpy->conn, ack, NULL);
  46     g_free(name);
  47
  48     xcb_grab_server(sc->dpy->conn);
  49
  50     sck = xcb_get_selection_owner(sc->dpy->conn, arep->atom);
  51     srep = xcb_get_selection_owner_reply(sc->dpy->conn, sck, NULL);
  52     taken = !!srep->owner;
  53     free(srep);
  54     if (taken) {
  55         printf(_("screen %d already has a composite manager, skipping\n"),
  56                sc->num);
  57         ret = FALSE;
  58     }
  59     else {
  60         xcb_timestamp_t time;
  61
  62         sc->selwin = w;
  63         sc->selatom = arep->atom;
  64
  65         time = screen_timestamp(sc);
  66
  67         xcb_set_selection_owner(sc->dpy->conn, w, arep->atom, time);
  68         sck = xcb_get_selection_owner(sc->dpy->conn, arep->atom);
  69         srep = xcb_get_selection_owner_reply(sc->dpy->conn, sck, NULL);
  70         taken = srep->owner == w;
  71         if (taken && screen_init(sc)) {
  72             screen_add_existing_windows(sc);
  73             ret = TRUE;
  74         }
  75         else {
  76             xcb_destroy_window(sc->dpy->conn, w);
  77             ret = FALSE;
  78         }
  79     }
  80
  81     xcb_ungrab_server(sc->dpy->conn);
  82     xcb_flush(sc->dpy->conn);
  83     return ret;
  84 }
  85
  86 static guint
  87 xcb_window_hash(xcb_window_t *w) { return *w; }
  88
  89 static gboolean
  90 xcb_window_compare(xcb_window_t *w1, xcb_window_t *w2) { return *w1 == *w2; }
  91
  92 static gboolean
  93 screen_init(d_screen_t *sc)
  94 {
  95     uint32_t mask;
  96 #if DO_COMP
  97     xcb_generic_error_t *err;
  98     xcb_void_cookie_t redir_ck;
  99     xcb_composite_get_overlay_window_cookie_t overlay_ck;
 100     xcb_composite_get_overlay_window_reply_t *overlay_rep;
 101
 102     redir_ck =
 103         xcb_composite_redirect_subwindows(sc->dpy->conn, sc->super.root,
 104                                           XCB_COMPOSITE_REDIRECT_MANUAL);
 105
 106     overlay_ck = xcb_composite_get_overlay_window(sc->dpy->conn,
 107                                                   sc->super.root);
 108
 109     /* check that the redirect worked */
 110     err = xcb_request_check(sc->dpy->conn, redir_ck);
 111     if (err) {
 112         printf(_("unable to redirect rendering, another composite manager must be running"));
 113         free(err);
 114         return FALSE;
 115     }
 116
 117     /* get the overlay window reply */
 118     overlay_rep = xcb_composite_get_overlay_window_reply(sc->dpy->conn,
 119                                                          overlay_ck,
 120                                                          NULL);
 121     if (!overlay_rep) {
 122         printf(_("unable to get the composite overlay window\n"));
 123         return FALSE;
 124     }
 125     sc->overlay = overlay_rep->overlay_win;
 126     free(overlay_rep);
 127 #endif
 128
 129     mask = SELECTION_MASK;
 130     xcb_change_window_attributes(sc->dpy->conn, sc->selwin,
 131                                  XCB_CW_EVENT_MASK, &mask);
 132     mask = ROOT_MASK;
 133     xcb_change_window_attributes(sc->dpy->conn, sc->super.root,
 134                                  XCB_CW_EVENT_MASK, &mask);
 135
 136     /* use the render backend */
 137     sc->paint = render_paint_screen;
 138
 139     gettimeofday(&sc->next_repaint, NULL);
 140
 141     sc->winhash = g_hash_table_new((GHashFunc)xcb_window_hash,
 142                                    (GCompareFunc)xcb_window_compare);
 143     sc->stacking = list_new();
 144
 145     return TRUE;
 146 }
 147
 148 void screen_free(d_screen_t *sc)
 149 {
 150     g_hash_table_unref(sc->winhash);
 151     list_unref(sc->stacking);
 152 }
 153
 154 void
 155 screen_add_window(d_screen_t *sc, xcb_window_t wid)
 156 {
 157     d_window_t *w;
 158
 159     /* XXX xgetwindowattributes - size and tings */
 160
 161     w = window_new(wid, sc);
 162     g_hash_table_insert(sc->winhash, &w->id, w);
 163
 164     printf("screen added window 0x%x\n", w->id);
 165 }
 166
 167 static void
 168 screen_add_existing_windows(d_screen_t *sc)
 169 {
 170     xcb_query_tree_cookie_t ck;
 171     xcb_query_tree_reply_t *rep;
 172
 173     ck = xcb_query_tree(sc->dpy->conn, sc->super.root);
 174     rep = xcb_query_tree_reply(sc->dpy->conn, ck, NULL);
 175     if (rep) {
 176         xcb_window_iterator_t it;
 177
 178         printf("query\n");
 179         it = xcb_query_tree_children_iterator(rep);
 180         for (; it.rem; xcb_window_next(&it))
 181             screen_add_window(sc, *it.data);
 182
 183         free(rep);
 184     }
 185 }
 186
 187 void
 188 screen_remove_window(d_screen_t *sc, struct d_window *w)
 189 {
 190     printf("screen removed window 0x%x\n", w->id);
 191
 192     g_hash_table_remove(sc->winhash, &w->id);
 193     w->become_zombie(w);
 194     window_unref(w);
 195 }
 196
 197 d_window_t*
 198 screen_find_window(d_screen_t *sc, xcb_window_t id)
 199 {
 200     return g_hash_table_lookup(sc->winhash, &id);
 201 }
 202
 203 static xcb_timestamp_t
 204 screen_timestamp(d_screen_t *sc)
 205 {
 206     xcb_void_cookie_t ck;
 207     xcb_timestamp_t   time;
 208
 209     ck = xcb_change_property(sc->dpy->conn, XCB_PROP_MODE_REPLACE, sc->selwin,
 210                              sc->selatom, sc->selatom, 32, 0, NULL);
 211     xcb_flush(sc->dpy->conn);
 212     while (1) {
 213         xcb_generic_event_t *ev;
 214
 215         ev = xcb_wait_for_event(sc->dpy->conn);
 216         if (!ev) {
 217             printf(_("IO error\n"));
 218             exit(0);
 219         }
 220
 221         /* expect errors.. */
 222         if (!ev->response_type) {
 223             display_error(sc->dpy, (xcb_generic_error_t*)ev);
 224             free(ev);
 225             continue;
 226         }
 227
 228         if (ev->response_type == XCB_PROPERTY_NOTIFY &&
 229             ev->full_sequence == ck.sequence)
 230         {
 231             time = ((xcb_property_notify_event_t*)ev)->time;
 232             free(ev);
 233             break;
 234         }
 235     }
 236     printf("created timestamp %lu\n", (unsigned long) time);
 237     return time;
 238 }
 239
 240 void
 241 screen_stacking_add(d_screen_t *sc, struct d_window *w)
 242 {
 243     list_prepend(sc->stacking, w);
 244 }
 245
 246 void
 247 screen_stacking_remove(d_screen_t *sc, struct d_window *w)
 248 {
 249     list_remove(sc->stacking, w);
 250 }
 251
 252 void
 253 screen_set_next_repaint(d_screen_t *sc)
 254 {
 255     gettimeofday(&sc->next_repaint, NULL);
 256     /* add time for the refresh rate (60 hz) */
 257     time_add(&sc->next_repaint, 1000000/60);
 258 }