[gnome-builder] colorpicker: allow color name changes from colorpicker UI

[Sébastien Lafargue <slafargue src gnome org>]

commit 442948191cf5c01dc00005a4e58a5946df5fed72
Author: Sebastien Lafargue <slafargue gnome org>
Date:   Tue Nov 1 16:53:02 2016 +0100

    colorpicker: allow color name changes from colorpicker UI
    
    After selecting a color name ('red' for example),
    you can now change it from the color plane.
    
    For now, we don't search for a matching existing color name,
    but use the rgba syntax. see the TODO

 contrib/gstyle/gstyle-color.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/contrib/gstyle/gstyle-color.c b/contrib/gstyle/gstyle-color.c
index bc35219..cdc8dd4 100644
--- a/contrib/gstyle/gstyle-color.c
+++ b/contrib/gstyle/gstyle-color.c
@@ -242,7 +242,14 @@ gstyle_color_to_string (GstyleColor     *self,
         string = g_strdup (predefined_colors_table [self->name_index].name);
       else
         {
-          /* TODO: get similar color using cie2000 */
+          /* TODO: search for a corresponding name in the predefined_colors_table
+           * or fallback to rgba syntax
+           */
+          red = (guint)(0.5 + CLAMP (self->rgba.red, 0.0, 1.0) * 255.0);
+          green = (guint)(0.5 + CLAMP (self->rgba.green, 0.0, 1.0) * 255.0);
+          blue = (guint)(0.5 + CLAMP (self->rgba.blue, 0.0, 1.0) * 255.0);
+
+          string = g_strdup_printf ("rgba(%i, %i, %i, %s)", red, green, blue, alpha_str);
         }
       break;