plug-ins: Fix Foggify color property

Since the color space invasion, GimpRGB
properties do not create widgets anymore.
For Python plug-ins, we need to add
GeglColor properties as GObjects with
GeglColor value types as a workaround.
This patch does this and updates the
Foggify plug-in with the new datatype.

libgimp/gimpgpparams-body.c

@@ -563,6 +563,10 @@ _gimp_param_spec_to_gp_param_def (GParamSpec *pspec,
         {
           type_name = "GimpParamPattern";
         }
+      else if (value_type == GEGL_TYPE_COLOR)
+        {
+          type_name = "GeglParamColor";
+        }
 
       if (type_name)
         {

libgimpconfig/gimpconfig-params.c

@@ -288,6 +288,20 @@ gimp_config_param_spec_duplicate (GParamSpec *pspec)
       color = g_value_dup_object (&value);
       g_value_unset (&value);
 
+      copy = gegl_param_spec_color (name, nick, blurb,
+                                    /*TRUE,*/
+                                    color, flags);
+      g_clear_object (&color);
+    }
+  else if (G_IS_PARAM_SPEC_OBJECT (pspec) &&
+           G_PARAM_SPEC_VALUE_TYPE (pspec) == GEGL_TYPE_COLOR)
+    {
+      GValue    *value;
+      GeglColor *color;
+
+      value = (GValue *) g_param_spec_get_default_value (pspec);
+      color = g_value_dup_object (value);
+
       copy = gegl_param_spec_color (name, nick, blurb,
                                     /*TRUE,*/
                                     color, flags);

plug-ins/python/foggify.py

@@ -19,6 +19,8 @@ gi.require_version('Gimp', '3.0')
 from gi.repository import Gimp
 gi.require_version('GimpUi', '3.0')
 from gi.repository import GimpUi
+gi.require_version('Gegl', '0.4')
+from gi.repository import Gegl
 from gi.repository import GObject
 from gi.repository import GLib
 from gi.repository import Gio
@@ -28,11 +30,12 @@ import sys
 def N_(message): return message
 def _(message): return GLib.dgettext(None, message)
 
-_color = Gimp.RGB()
-_color.set_uchar(240, 0, 0)
-_color.set_alpha(1.0)
-
 def foggify(procedure, run_mode, image, n_drawables, drawables, config, data):
+    Gegl.init(None)
+
+    _color = Gegl.Color.new("black")
+    _color.set_rgba(0.94, 0, 0, 1.0)
+
     # Work around not being able to set default color by only setting it
     # when color in our config is None. This won't help when resetting to
     # factory default. This also fixes a critical when running without
@@ -43,6 +46,7 @@ def foggify(procedure, run_mode, image, n_drawables, drawables, config, data):
 
     if run_mode == Gimp.RunMode.INTERACTIVE:
         GimpUi.init('python-fu-foggify')
+
         dialog = GimpUi.ProcedureDialog(procedure=procedure, config=config)
         dialog.fill(None)
         if not dialog.run():
@@ -123,7 +127,7 @@ class Foggify (Gimp.PlugIn):
     # supposed to allow setting a default, except it doesn't seem to
     # work. I still leave it this way for now until we figure this out
     # as it should be the better syntax.
-    color = GObject.Property(type =Gimp.RGB, default=_color,
+    color = GObject.Property(type =Gegl.Color, default=None,
                              nick =_("_Fog color"),
                              blurb=_("Fog color"))