[vala/0.42] libgvc: Some additions and ownership/return-type fixes

[Rico Tzschichholz <ricotz src gnome org>]

commit c17897d6caad70250f530c92f56268e4c9531ebc
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Nov 15 11:18:04 2018 +0100

    libgvc: Some additions and ownership/return-type fixes

 vapi/libgvc.vapi | 40 +++++++++++++++++++++++++---------------
 1 file changed, 25 insertions(+), 15 deletions(-)
---
diff --git a/vapi/libgvc.vapi b/vapi/libgvc.vapi
index b3477e4a0..e28c910fc 100644
--- a/vapi/libgvc.vapi
+++ b/vapi/libgvc.vapi
@@ -91,7 +91,7 @@ namespace Gvc {
                public int render_jobs (Graph graph);
 
                [CCode (cname = "gvRenderData")]
-               public int render_data (Graph graph, [CCode (type = "char*")] string file_type, [CCode (type 
= "char**")] out uint8[] output_data);
+               public int render_data (Graph graph, [CCode (type = "char*")] string file_type, [CCode 
(array_length_type = "unsigned int", type = "char**")] out uint8[] output_data);
        }
 
        [Compact]
@@ -104,7 +104,7 @@ namespace Gvc {
                public unowned string? get ([CCode (type = "char*")] string attribute_name);
 
                [CCode (cname = "agset")]
-               public void set ([CCode (type = "char*")] string attribute_name, [CCode (type = "char*")] 
string attribute_value);
+               public int set ([CCode (type = "char*")] string attribute_name, [CCode (type = "char*")] 
string attribute_value);
 
                [CCode (cname = "agsafeset")]
                public void safe_set ([CCode (type = "char*")] string attribute_name, [CCode (type = 
"char*")] string attribute_value, [CCode (type = "char*")] string? default_value);
@@ -141,47 +141,58 @@ namespace Gvc {
 
                [CCode (cname = "agnode")]
 #if WITH_CGRAPH
-               public Node create_node ([CCode (type = "char*")] string node_name, int createflag = 1);
+               public unowned Node create_node ([CCode (type = "char*")] string node_name, int createflag = 
1);
 #else
-               public Node create_node ([CCode (type = "char*")] string node_name);
+               public unowned Node create_node ([CCode (type = "char*")] string node_name);
 #endif
 
                [CCode (cname = "agedge")]
 #if WITH_CGRAPH
-               public Edge create_edge (Node from, Node to, string? name = null, int createflag = 1);
+               public unowned Edge create_edge (Node from, Node to, string? name = null, int createflag = 1);
 #else
-               public Edge create_edge (Node from, Node to);
+               public unowned Edge create_edge (Node from, Node to);
 #endif
 
+               [CCode (cname = "agfindedge")]
+               public unowned Edge? find_edge (Node from, Node tO);
+
                [CCode (cname = "agsubg")]
+#if WITH_CGRAPH
+               public unowned Graph create_subgraph ([CCode (type = "char*")] string? name, int createflag = 
1);
+#else
                public unowned Graph create_subgraph ([CCode (type = "char*")] string? name);
+#endif
 
                [CCode (cname = "agfindsubg")]
-               public Graph find_subgraph ([CCode (type = "char*")] string name);
+               public unowned Graph? find_subgraph ([CCode (type = "char*")] string name);
 
                [CCode (cname = "agidsubg")]
-               public Graph create_subgraph_id (ulong id);
+#if WITH_CGRAPH
+               public unowned Graph create_subgraph_id (ulong id, int createflag = 1);
+#else
+               public unowned Graph create_subgraph_id (ulong id);
+#endif
 
                [CCode (cname = "agfstsubg")]
-               public Graph get_first_subgraph ();
+               public unowned Graph? get_first_subgraph ();
 
                [CCode (cname = "agnxtsubg")]
-               public Graph get_next_subgraph ();
+               public unowned Graph? get_next_subgraph ();
 
                [CCode (cname = "agparent")]
-               public Graph get_parent_graph ();
+               public unowned Graph? get_parent_graph ();
 
                [CCode (cname = "agdelsubg")]
                public int delete_subgraph (Graph subgraph);
 
                [CCode (cname = "agfindnode")]
-               public Node? find_node ([CCode (type = "char*")] string node_name);
+               public unowned Node? find_node ([CCode (type = "char*")] string node_name);
 
                [CCode (cname = "agfstnode")]
-               public Node? get_first_node ();
+               public unowned Node? get_first_node ();
 
                [CCode (cname = "agnxtnode")]
-               public Node? get_next_node (Node node);
+               public unowned Node? get_next_node (Node node);
 
                [CCode (cname = "agget")]
                public unowned string? get ([CCode (type = "char*")] string attribute_name);
@@ -197,7 +208,6 @@ namespace Gvc {
 
                [CCode (cname = "AG_IS_STRICT")]
                public bool is_strict ();
-
        }
 
        [CCode (cname = "char", copy_function = "agdupstr_html", free_function = "agstrfree")]