[gegl] fattal02: pass-through on infinite planes (issue #179)

[Thomas Manni <tmanni src gnome org>]

commit 2535e9b3dc8278705cac3aa7c4affa0e0d9ea202
Author: Thomas Manni <thomas manni free fr>
Date:   Wed Jul 31 20:20:59 2019 +0200

    fattal02: pass-through on infinite planes (issue #179)

 operations/common/fattal02.c | 53 ++++++++++++++++++++++++++++++++------------
 1 file changed, 39 insertions(+), 14 deletions(-)
---
diff --git a/operations/common/fattal02.c b/operations/common/fattal02.c
index 59accb952..10ef43680 100644
--- a/operations/common/fattal02.c
+++ b/operations/common/fattal02.c
@@ -1226,26 +1226,27 @@ fattal02_prepare (GeglOperation *operation)
   gegl_operation_set_format (operation, "output", babl_format_with_space (OUTPUT_FORMAT, space));
 }
 
-
 static GeglRectangle
-fattal02_get_required_for_output (GeglOperation       *operation,
-                                  const gchar         *input_pad,
-                                  const GeglRectangle *roi)
+fattal02_get_cached_region (GeglOperation       *operation,
+                            const GeglRectangle *roi)
 {
-  GeglRectangle result = *gegl_operation_source_get_bounding_box (operation,
-                                                                  "input");
-  return result;
-}
+  const GeglRectangle *in_rect =
+      gegl_operation_source_get_bounding_box (operation, "input");
 
+  if (in_rect && ! gegl_rectangle_is_infinite_plane (in_rect))
+    return *in_rect;
+
+  return *roi;
+}
 
 static GeglRectangle
-fattal02_get_cached_region (GeglOperation       *operation,
-                            const GeglRectangle *roi)
+fattal02_get_required_for_output (GeglOperation       *operation,
+                                  const gchar         *input_pad,
+                                  const GeglRectangle *roi)
 {
-  return *gegl_operation_source_get_bounding_box (operation, "input");
+  return fattal02_get_cached_region (operation, roi);
 }
 
-
 static gboolean
 fattal02_process (GeglOperation       *operation,
                   GeglBuffer          *input,
@@ -1309,9 +1310,32 @@ fattal02_process (GeglOperation       *operation,
   return TRUE;
 }
 
+static gboolean
+fattal02_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)
 {
@@ -1324,6 +1348,7 @@ gegl_op_class_init (GeglOpClass *klass)
   filter_class->process = fattal02_process;
 
   operation_class->prepare                 = fattal02_prepare;
+  operation_class->process                 = fattal02_operation_process;
   operation_class->get_required_for_output = fattal02_get_required_for_output;
   operation_class->get_cached_region       = fattal02_get_cached_region;
   operation_class->threaded                = FALSE;