parse unicode color names (#686)

lib/threads/color.py

@@ -1,8 +1,10 @@
 import colorsys
-from pyembroidery.EmbThread import EmbThread
 import re
 
+import tinycss2.color3
+
 import simplestyle
+from pyembroidery.EmbThread import EmbThread
 
 
 class ThreadColor(object):
@@ -17,6 +19,10 @@ class ThreadColor(object):
             self.manufacturer = color.brand
             self.rgb = (color.get_red(), color.get_green(), color.get_blue())
             return
+        elif isinstance(color, unicode):
+            self.rgb = tinycss2.color3.parse_color(color)
+            # remove alpha channel and multiply with 255
+            self.rgb = tuple(channel * 255.0 for channel in list(self.rgb)[:-1])
         elif isinstance(color, (list, tuple)):
             self.rgb = tuple(color)
         elif self.hex_str_re.match(color):