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Filter mirrored monitors from the monitors list

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For the purposes of window placement or arranging window manager or
plugin controls, screens that are just mirrors of other screens should
be ignored, so filter them out of the monitors list.

https://bugzilla.gnome.org/show_bug.cgi?id=649299
This commit is contained in:
Owen W. Taylor 2011-05-03 13:04:01 -04:00
parent 64e6b77dc3
commit c573523c4d
1 changed files with 39 additions and 0 deletions
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39
src/core/screen.c
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@ -349,6 +349,43 @@ set_wm_icon_size_hint (MetaScreen *screen)
#undef N_VALS
}
/* The list of monitors reported by the windowing system might include
* mirrored monitors with identical bounds. Since mirrored monitors
* shouldn't be treated as separate monitors for most purposes, we
* filter them out here. (We ignore the possibility of partially
* overlapping monitors because they are rare and it's hard to come
* up with any sensible interpretation.)
*/
static void
filter_mirrored_monitors (MetaScreen *screen)
{
int i, j;
/* Currently always true and simplifies things */
g_assert (screen->primary_monitor_index == 0);
for (i = 1; i < screen->n_monitor_infos; i++)
{
/* In case we've filtered previous monitors */
screen->monitor_infos[i].number = i;
for (j = 0; j < i; j++)
{
if (meta_rectangle_equal (&screen->monitor_infos[i].rect,
&screen->monitor_infos[j].rect))
{
memmove (&screen->monitor_infos[i],
&screen->monitor_infos[i + 1],
(screen->n_monitor_infos - i - 1) * sizeof (MetaMonitorInfo));
screen->n_monitor_infos--;
i--;
continue;
}
}
}
}
static void
reload_monitor_infos (MetaScreen *screen)
{
@ -538,6 +575,8 @@ reload_monitor_infos (MetaScreen *screen)
screen->monitor_infos[0].rect = screen->rect;
}
filter_mirrored_monitors (screen);
g_assert (screen->n_monitor_infos > 0);
g_assert (screen->monitor_infos != NULL);
}