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monitor-manager-xrandr: Be more robust when reading XRROutputInfos

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We might get modes in XRROutputInfos that aren't in the
XRRScreenResources we get earlier. This always seems to be transient,
i.e. when it happens, the X server will usually send us a follow up
RRScreenChangeNotify where we then get a "stable" view of the world
again.

In any case, when these glitches happen, we end up with NULL pointers
in the MetaOutput->modes array which makes us crash later on. This
patch ensures that doesn't happen.

https://bugzilla.gnome.org/show_bug.cgi?id=756660
This commit is contained in:
Rui Matos 2015-10-15 19:34:40 +02:00
parent d6d377a447
commit 43a1d43f2b
1 changed files with 29 additions and 13 deletions
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42
src/backends/x11/meta-monitor-manager-xrandr.c
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@ -637,6 +637,32 @@ output_get_connector_type (MetaMonitorManagerXrandr *manager_xrandr,
return META_CONNECTOR_TYPE_Unknown;
}
static void
output_get_modes (MetaMonitorManager *manager,
MetaOutput *meta_output,
XRROutputInfo *output)
{
guint j, k;
guint n_actual_modes;
meta_output->modes = g_new0 (MetaMonitorMode *, output->nmode);
n_actual_modes = 0;
for (j = 0; j < (guint)output->nmode; j++)
{
for (k = 0; k < manager->n_modes; k++)
{
if (output->modes[j] == (XID)manager->modes[k].mode_id)
{
meta_output->modes[n_actual_modes] = &manager->modes[k];
n_actual_modes += 1;
break;
}
}
}
meta_output->n_modes = n_actual_modes;
}
static char *
get_xmode_name (XRRModeInfo *xmode)
{
@ -773,6 +799,8 @@ meta_monitor_manager_xrandr_read_current (MetaMonitorManager *manager)
MetaOutput *meta_output;
output = XRRGetOutputInfo (manager_xrandr->xdisplay, resources, resources->outputs[i]);
if (!output)
continue;
meta_output = &manager->outputs[n_actual_outputs];
@ -796,19 +824,7 @@ meta_monitor_manager_xrandr_read_current (MetaMonitorManager *manager)
meta_output->connector_type = output_get_connector_type (manager_xrandr, meta_output);
output_get_tile_info (manager_xrandr, meta_output);
meta_output->n_modes = output->nmode;
meta_output->modes = g_new0 (MetaMonitorMode *, meta_output->n_modes);
for (j = 0; j < meta_output->n_modes; j++)
{
for (k = 0; k < manager->n_modes; k++)
{
if (output->modes[j] == (XID)manager->modes[k].mode_id)
{
meta_output->modes[j] = &manager->modes[k];
break;
}
}
}
output_get_modes (manager, meta_output, output);
meta_output->preferred_mode = meta_output->modes[0];
meta_output->n_possible_crtcs = output->ncrtc;