From d80ccb08d892203ba3ef41e6e4afe2eaace96801 Mon Sep 17 00:00:00 2001
From: Alx Sa <cmyk.student@gmail.com>
Date: Wed, 1 Jan 2025 21:25:52 -0500
Subject: [PATCH] plug-ins: Include filters when composing

Since we use gimp_drawable_get_buffer () to get the
pixel data when composing or recomposing, NDE filters
were not being included in the final output.
This patch temporarily duplicates the layer, merges the
filters, and then retrieves the GeglBuffer from the merged
version of the layer rather than the raw pixels.
---
 plug-ins/common/compose.c | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

diff --git a/plug-ins/common/compose.c b/plug-ins/common/compose.c
index 0b8a5e9083..5b108add95 100644
--- a/plug-ins/common/compose.c
+++ b/plug-ins/common/compose.c
@@ -145,6 +145,9 @@ static void        cpn_affine_transform   (GeglBuffer          *buffer,
                                            gdouble              min,
                                            gdouble              max);
 
+static GeglBuffer * get_buffer_with_filters
+                                          (GimpLayer           *layer);
+
 static void   fill_buffer_from_components (GeglBuffer          *temp[MAX_COMPOSE_IMAGES],
                                            GeglBuffer          *dst,
                                            gint                 num_cpn,
@@ -854,6 +857,32 @@ cpn_affine_transform (GeglBuffer *buffer,
     }
 }
 
+static GeglBuffer *
+get_buffer_with_filters (GimpLayer *layer)
+{
+  GimpImage  *image = gimp_item_get_image (GIMP_ITEM (layer));
+  GimpLayer  *temp  = gimp_layer_copy (layer);
+  GeglBuffer *src_buffer;
+  GeglBuffer *dst_buffer;
+
+  gimp_image_insert_layer (image, temp, NULL,
+                           gimp_image_get_item_position (image,
+                                                         GIMP_ITEM (layer)));
+
+  gimp_drawable_merge_filters (GIMP_DRAWABLE (temp));
+
+  src_buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (temp));
+  dst_buffer = gegl_buffer_new (gegl_buffer_get_extent (src_buffer),
+                                gegl_buffer_get_format (src_buffer));
+
+  gegl_buffer_copy (src_buffer, NULL, GEGL_ABYSS_NONE, dst_buffer, NULL);
+
+  gimp_image_remove_layer (image, temp);
+  g_object_unref (src_buffer);
+
+  return dst_buffer;
+}
+
 static void
 fill_buffer_from_components (GeglBuffer   *temp[MAX_COMPOSE_IMAGES],
                              GeglBuffer   *dst,
@@ -1055,7 +1084,7 @@ compose (const gchar         *compose_type,
       for (j = 0; j < num_images; j++)
         {
           if (inputs[j].is_object)
-            buffer_src[j] = gimp_drawable_get_buffer (inputs[j].comp.object);
+            buffer_src[j] = get_buffer_with_filters (inputs[j].comp.object);
           else
             buffer_src[j] = NULL;
         }
@@ -1097,7 +1126,7 @@ compose (const gchar         *compose_type,
                 }
 
               /* Get drawable for layer */
-              buffer_src[j] = gimp_drawable_get_buffer (GIMP_DRAWABLE (layers[0]));
+              buffer_src[j] = get_buffer_with_filters (layers[0]);
               g_free (layers);
             }
         }