Submitted By: Pierre Labastie <pierre dot labastie at neuf dot fr>
Date: 2025-09-30
Initial Package Version: 0.56.18
Upstream Status: issue #1621
Origin: archlinux
Description: (from bug report)
The gvRenderData changed the length type for the array to size_t. I attached
a patch file which changes the length type in the vapi and in the charts
write_buffer function. There are more similar breaking changes, which would
need changes in the vapi, which are not included in this patch, this is the
minimal change to make valadoc working with graphviz 13.0.0.

diff --git i/libvaladoc/charts/chart.vala w/libvaladoc/charts/chart.vala
index 4e642d1ce..5ef49527b 100644
--- i/libvaladoc/charts/chart.vala
+++ w/libvaladoc/charts/chart.vala
@@ -52,15 +52,16 @@ public class Valadoc.Charts.Chart : Api.Visitor {
 		context.render (graph, file_type, file);
 	}
 
-	public uint8[]? write_buffer (string file_type) {
+	public uint8[:size_t]? write_buffer (string file_type) {
 		if (context == null) {
 			context = factory.create_context (graph);
 		}
 
-		uint8[]? data;
+		uint8[:size_t]? data;
 
 		/* This will return null in data if it fails. */
 		context.render_data (graph, file_type, out data);
+
 		return data;
 	}
 
diff --git i/vapi/libgvc.vapi w/vapi/libgvc.vapi
index b128a02ad..8a2211ce2 100644
--- i/vapi/libgvc.vapi
+++ w/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 (array_length_type = "unsigned int", type = "char**")] out uint8[] output_data);
+		public int render_data (Graph graph, [CCode (type = "char*")] string file_type, [CCode (array_length_type = "size_t", type = "char**")] out uint8[] output_data);
 	}
 
 	[Compact]