Listing all defs in a SVG

Hi,

I needed to know if certain layers were present in a SVG for use with
rsvg_handle_render_cairo_sub(). So I implemented
rsvg_handle_get_all_defs(), and it works for me. The patch is below.

Is this function suitable for inclusion in the API? I was thinking the
function could return the defs prepended with '#', because this is the
form expected by rsvg_handle_render_cairo_sub(), but I'm undecided.


Cheers,

Rodney

Index: librsvg.def
===================================================================
--- librsvg.def	(revision 1179)
+++ librsvg.def	(working copy)
@@ -33,3 +33,4 @@
 _rsvg_acquire_xlink_href_resource
 _rsvg_register_types
 rsvg_pixbuf_from_data_with_size_data
+rsvg_handle_get_all_defs
Index: rsvg-defs.c
===================================================================
--- rsvg-defs.c	(revision 1179)
+++ rsvg-defs.c	(working copy)
@@ -199,3 +199,25 @@
 
     }
 }
+
+/**
+ * rsvg_handle_get_all_defs
+ * @handle: A #RsvgHandle
+ *
+ * Lists the names of all elements of the SVG.
+ *
+ * Returns: a #GList of #gchar* containing all element names in the
+ *   SVG. The content of the list is owned by the SVG handle and
+ *   should not be modified or freed. Use g_list_free() when done
+ *   using the list.
+ *
+ * Since: 2.26
+ */
+GList *
+rsvg_handle_get_all_defs (RsvgHandle *handle)
+{
+	g_return_val_if_fail (handle != NULL, NULL);
+	g_warn_if_fail (handle->priv->is_closed);
+
+	return g_hash_table_get_keys (handle->priv->defs->hash);
+}
Index: rsvg.h
===================================================================
--- rsvg.h	(revision 1179)
+++ rsvg.h	(working copy)
@@ -127,6 +127,8 @@
 RsvgHandle *rsvg_handle_new_from_data (const guint8 * data, gsize data_len, GError ** error);
 RsvgHandle *rsvg_handle_new_from_file (const gchar * file_name, GError ** error);
 
+GList *rsvg_handle_get_all_defs (RsvgHandle * handle);
+
 #ifndef RSVG_DISABLE_DEPRECATED
 
 void rsvg_handle_free (RsvgHandle * handle);

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