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monitor: Add support to privacy screen

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Some monitors support hardware features to enable the privacy screen
mode that allows users to toggle (via software or hardware button) a
state in which the display may be harder to see to people not sitting
in front of it.

Expose then this capability to the monitor level so that we can get its
state and set it.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1952>
This commit is contained in:
Marco Trevisan (Treviño)
2021-03-22 01:02:19 +01:00
committed by Marge Bot
parent 8ebdae8092
commit f231672084
4 changed files with 112 additions and 0 deletions
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44
src/backends/meta-output.c
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@@ -419,6 +419,50 @@ meta_output_finalize (GObject *object)
G_OBJECT_CLASS (meta_output_parent_class)->finalize (object);
}
MetaPrivacyScreenState
meta_output_get_privacy_screen_state (MetaOutput *output)
{
MetaOutputClass *output_class = META_OUTPUT_GET_CLASS (output);
if (!output_class->get_privacy_screen_state)
return META_PRIVACY_SCREEN_UNAVAILABLE;
return output_class->get_privacy_screen_state (output);
}
gboolean
meta_output_set_privacy_screen_enabled (MetaOutput *output,
gboolean enabled,
GError **error)
{
MetaOutputClass *output_class = META_OUTPUT_GET_CLASS (output);
MetaPrivacyScreenState state;
state = meta_output_get_privacy_screen_state (output);
if (state == META_PRIVACY_SCREEN_UNAVAILABLE)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
"The privacy screen is not supported by this output");
return FALSE;
}
g_assert (output_class->set_privacy_screen_enabled != NULL);
if (state & META_PRIVACY_SCREEN_LOCKED)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
"The privacy screen is locked at hardware level, "
"impossible to set it");
return FALSE;
}
if (!!(state & META_PRIVACY_SCREEN_ENABLED) == enabled)
return TRUE;
return output_class->set_privacy_screen_enabled (output, enabled, error);
}
static void
meta_output_init (MetaOutput *output)
{