[gimp] libgimpcolor: add gimp_param_spec_rgb_get_default()

[Michael Natterer <mitch src gnome org>]

commit 3597e92a20095ba49b0dca1442b62d5beb5ddd46
Author: Michael Natterer <mitch gimp org>
Date:   Sat Jul 27 16:10:24 2019 +0200

    libgimpcolor: add gimp_param_spec_rgb_get_default()

 libgimpcolor/gimpcolor.def |  1 +
 libgimpcolor/gimprgb.c     | 21 +++++++++++++++++++++
 libgimpcolor/gimprgb.h     | 22 ++++++++++++----------
 3 files changed, 34 insertions(+), 10 deletions(-)
---
diff --git a/libgimpcolor/gimpcolor.def b/libgimpcolor/gimpcolor.def
index 505baf7211..47dbb99c57 100644
--- a/libgimpcolor/gimpcolor.def
+++ b/libgimpcolor/gimpcolor.def
@@ -69,6 +69,7 @@ EXPORTS
        gimp_hsva_set
        gimp_param_rgb_get_type
        gimp_param_spec_rgb
+       gimp_param_spec_rgb_get_default
        gimp_param_spec_rgb_has_alpha
        gimp_pixbuf_create_buffer
        gimp_pixbuf_get_format
diff --git a/libgimpcolor/gimprgb.c b/libgimpcolor/gimprgb.c
index 5bdc20e6f3..913b83974a 100644
--- a/libgimpcolor/gimprgb.c
+++ b/libgimpcolor/gimprgb.c
@@ -765,10 +765,31 @@ gimp_param_spec_rgb (const gchar   *name,
 
   if (default_value)
     cspec->default_value = *default_value;
+  else
+    gimp_rgba_set (&cspec->default_value, 0.0, 0.0, 0.0, 1.0);
 
   return G_PARAM_SPEC (cspec);
 }
 
+/**
+ * gimp_param_spec_rgb_get_default:
+ * @pspec:         a #GimpParamSpecRGB.
+ * @default_value: return location for @pspec's default value
+ *
+ * Returns the @pspec's default color value.
+ *
+ * Since: 2.10.12
+ **/
+void
+gimp_param_spec_rgb_get_default (GParamSpec *pspec,
+                                 GimpRGB    *default_value)
+{
+  g_return_if_fail (GIMP_IS_PARAM_SPEC_RGB (pspec));
+  g_return_if_fail (default_value != NULL);
+
+  *default_value = GIMP_PARAM_SPEC_RGB (pspec)->default_value;
+}
+
 /**
  * gimp_param_spec_rgb_has_alpha:
  * @pspec: a #GParamSpec to hold an #GimpRGB value.
diff --git a/libgimpcolor/gimprgb.h b/libgimpcolor/gimprgb.h
index 485ecce022..0bb0791bad 100644
--- a/libgimpcolor/gimprgb.h
+++ b/libgimpcolor/gimprgb.h
@@ -51,16 +51,18 @@ void    gimp_value_set_rgb          (GValue        *value,
 #define GIMP_IS_PARAM_SPEC_RGB(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), GIMP_TYPE_PARAM_RGB))
 
 
-GType        gimp_param_rgb_get_type       (void) G_GNUC_CONST;
-
-GParamSpec * gimp_param_spec_rgb           (const gchar    *name,
-                                            const gchar    *nick,
-                                            const gchar    *blurb,
-                                            gboolean        has_alpha,
-                                            const GimpRGB  *default_value,
-                                            GParamFlags     flags);
-
-gboolean     gimp_param_spec_rgb_has_alpha (GParamSpec     *pspec);
+GType        gimp_param_rgb_get_type         (void) G_GNUC_CONST;
+
+GParamSpec * gimp_param_spec_rgb             (const gchar    *name,
+                                              const gchar    *nick,
+                                              const gchar    *blurb,
+                                              gboolean        has_alpha,
+                                              const GimpRGB  *default_value,
+                                              GParamFlags     flags);
+
+void         gimp_param_spec_rgb_get_default (GParamSpec     *pspec,
+                                              GimpRGB        *default_value);
+gboolean     gimp_param_spec_rgb_has_alpha   (GParamSpec     *pspec);
 
 
 /*  RGB and RGBA color types and operations taken from LibGCK  */