[gegl] maze: pass-through on infinite planes (issue #179)

[Thomas Manni <tmanni src gnome org>]

commit 32829d10d88dc0fdcf1d65e585ac4d324e6b87fd
Author: Thomas Manni <thomas manni free fr>
Date:   Tue Jul 30 21:25:50 2019 +0200

    maze: pass-through on infinite planes (issue #179)

 operations/common-gpl3+/maze.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)
---
diff --git a/operations/common-gpl3+/maze.c b/operations/common-gpl3+/maze.c
index b7cdb5c17..eecc0dad7 100644
--- a/operations/common-gpl3+/maze.c
+++ b/operations/common-gpl3+/maze.c
@@ -584,7 +584,8 @@ get_cached_region (GeglOperation       *operation,
   GeglRectangle *in_rect;
 
   in_rect = gegl_operation_source_get_bounding_box (operation, "input");
-  if (in_rect)
+
+  if (in_rect && ! gegl_rectangle_is_infinite_plane (in_rect))
     {
       result = *in_rect;
     }
@@ -776,6 +777,32 @@ process (GeglOperation       *operation,
   return TRUE;
 }
 
+static gboolean
+operation_process (GeglOperation        *operation,
+                   GeglOperationContext *context,
+                   const gchar          *output_prop,
+                   const GeglRectangle  *result,
+                   gint                  level)
+{
+  GeglOperationClass  *operation_class;
+
+  const GeglRectangle *in_rect =
+    gegl_operation_source_get_bounding_box (operation, "input");
+
+  if (in_rect && gegl_rectangle_is_infinite_plane (in_rect))
+    {
+      gpointer in = gegl_operation_context_get_object (context, "input");
+      gegl_operation_context_take_object (context, "output",
+                                          g_object_ref (G_OBJECT (in)));
+      return TRUE;
+    }
+
+  operation_class = GEGL_OPERATION_CLASS (gegl_op_parent_class);
+
+  return operation_class->process (operation, context, output_prop, result,
+                                   gegl_operation_context_get_level (context));
+}
+
 static void
 gegl_op_class_init (GeglOpClass *klass)
 {
@@ -787,6 +814,7 @@ gegl_op_class_init (GeglOpClass *klass)
 
   operation_class->get_cached_region = get_cached_region;
   operation_class->prepare           = prepare;
+  operation_class->process           = operation_process;
   operation_class->threaded          = FALSE;
   filter_class->process              = process;