[template-glib] gi: locate GTypes from GIRegisteredTypeInfo

[Christian Hergert <chergert src gnome org>]

commit 740490e16e918adfbf991a5e46d4a137d7b6703a
Author: Christian Hergert <chergert redhat com>
Date:   Mon Oct 23 16:33:38 2017 -0700

    gi: locate GTypes from GIRegisteredTypeInfo
    
    This allows you to convert something like GObject.Object into a
    GType when the GI parameter is expected a GType.

 src/tmpl-gi.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/tmpl-gi.c b/src/tmpl-gi.c
index 092fff1..2c04c54 100644
--- a/src/tmpl-gi.c
+++ b/src/tmpl-gi.c
@@ -142,6 +142,10 @@ tmpl_gi_argument_from_g_value (const GValue  *value,
     case GI_TYPE_TAG_GTYPE:
       if (G_VALUE_HOLDS (value, G_TYPE_GTYPE))
         arg->v_long = g_value_get_gtype (value);
+      else if (G_VALUE_HOLDS (value, TMPL_TYPE_BASE_INFO) &&
+               g_value_get_pointer (value) != NULL &&
+               GI_IS_REGISTERED_TYPE_INFO (g_value_get_pointer (value)))
+        arg->v_long = g_registered_type_info_get_g_type (g_value_get_pointer (value));
       else
         return_type_mismatch (value, G_TYPE_GTYPE);
       return TRUE;