[gimp/wip/passthrough: 19/26] app: connect layer backdrop to source node's input

[N/A <ell src gnome org>]

commit 6f301f4181d344dd6f5e87f7218c51c5c17e38c4
Author: Ell <ell_se yahoo com>
Date:   Fri Apr 21 15:38:57 2017 -0400

    app: connect layer backdrop to source node's input
    
    Make sure the input of the layer's filter node is connected to its
    source node (when it has an input pad), so that, once we implement
    pass-though mode, the group's source node can see the backdrop.

 app/core/gimpdrawable.c |    9 +++++++++
 app/core/gimplayer.c    |    6 ++++++
 2 files changed, 15 insertions(+), 0 deletions(-)
---
diff --git a/app/core/gimpdrawable.c b/app/core/gimpdrawable.c
index 8fe8d46..108bdc8 100644
--- a/app/core/gimpdrawable.c
+++ b/app/core/gimpdrawable.c
@@ -1245,6 +1245,7 @@ gimp_drawable_set_buffer_full (GimpDrawable *drawable,
 GeglNode *
 gimp_drawable_get_source_node (GimpDrawable *drawable)
 {
+  GeglNode *input;
   GeglNode *source;
   GeglNode *filter;
   GeglNode *output;
@@ -1256,12 +1257,20 @@ gimp_drawable_get_source_node (GimpDrawable *drawable)
 
   drawable->private->source_node = gegl_node_new ();
 
+  input = gegl_node_get_input_proxy (drawable->private->source_node, "input");
+
   source = GIMP_DRAWABLE_GET_CLASS (drawable)->get_source_node (drawable);
 
   gegl_node_add_child (drawable->private->source_node, source);
 
   g_object_unref (source);
 
+  if (gegl_node_has_pad (source, "input"))
+    {
+      gegl_node_connect_to (input,  "output",
+                            source, "input");
+    }
+
   filter = gimp_filter_stack_get_graph (GIMP_FILTER_STACK (drawable->private->filter_stack));
 
   gegl_node_add_child (drawable->private->source_node, filter);
diff --git a/app/core/gimplayer.c b/app/core/gimplayer.c
index 4860217..8f00663 100644
--- a/app/core/gimplayer.c
+++ b/app/core/gimplayer.c
@@ -700,12 +700,15 @@ gimp_layer_get_node (GimpFilter *filter)
   GimpDrawable *drawable = GIMP_DRAWABLE (filter);
   GimpLayer    *layer    = GIMP_LAYER (filter);
   GeglNode     *node;
+  GeglNode     *input;
   GeglNode     *source;
   GeglNode     *mode_node;
   gboolean      source_node_hijacked = FALSE;
 
   node = GIMP_FILTER_CLASS (parent_class)->get_node (filter);
 
+  input = gegl_node_get_input_proxy (node, "input");
+
   source = gimp_drawable_get_source_node (drawable);
 
   /* if the source node already has a parent, we are a floating
@@ -718,6 +721,9 @@ gimp_layer_get_node (GimpFilter *filter)
   if (! source_node_hijacked)
     gegl_node_add_child (node, source);
 
+  gegl_node_connect_to (input,  "output",
+                        source, "input");
+
   g_warn_if_fail (layer->layer_offset_node == NULL);
   g_warn_if_fail (layer->mask_offset_node == NULL);