gvRender*: render subgraph when given, not always root graph

These functions always rendered the root graph, even if a sub graph
was given. Apart from being incorrect, this caused
heap-buffer-overflow when trying to render a graph consisting of two
subgraph of which only one had a layout. Also, even if both subgraphs
had layouts, they somehow mixed up the bounding boxes of the graphs
causing some nodes and edges not to be rendered since they were
outside the graph bounding box.

diff --git a/lib/gvc/gvc.c b/lib/gvc/gvc.c
index 1df28de13f71deaeddc36e811d2a84ccb9c7f418..a0de4f647e93a4d265c3f7abc01fc1f6fd35619a 100644 (file)
--- a/lib/gvc/gvc.c
+++ b/lib/gvc/gvc.c
@@ -85,8 +85,6 @@ int gvRender(GVC_t *gvc, graph_t *g, const char *format, FILE *out)
     int rc;
     GVJ_t *job;
 
-    g = g->root;
-
     /* create a job for the required format */
     bool r = gvjobs_output_langname(gvc, format);
     job = gvc->job;
@@ -117,8 +115,6 @@ int gvRenderFilename(GVC_t *gvc, graph_t *g, const char *format, const char *fil
     int rc;
     GVJ_t *job;
 
-    g = g->root;
-
     /* create a job for the required format */
     bool r = gvjobs_output_langname(gvc, format);
     job = gvc->job;
@@ -148,8 +144,6 @@ int gvRenderContext(GVC_t *gvc, graph_t *g, const char *format, void *context)
     int rc;
     GVJ_t *job;
        
-    g = g->root;
-       
     /* create a job for the required format */
     bool r = gvjobs_output_langname(gvc, format);
     job = gvc->job;
@@ -182,8 +176,6 @@ int gvRenderData(GVC_t *gvc, graph_t *g, const char *format, char **result, unsi
     int rc;
     GVJ_t *job;
 
-    g = g->root;
-
     /* create a job for the required format */
     bool r = gvjobs_output_langname(gvc, format);
     job = gvc->job;