Add color fetching from text layers

lib/psd/layer_info/typetool.coffee

@@ -60,6 +60,17 @@ module.exports = class TextElements extends LayerInfo
     @engineData.EngineDict.ParagraphRun.RunArray.map (s) ->
       alignments[Math.min(parseInt(s.ParagraphSheet.Properties.Justification, 10), 3)]
 
+  # Return all colors used for text in this layer. The colors are returned in RGBA
+  # format as an array of arrays.
+  colors: ->
+    # If the color is opaque black, this field is sometimes omitted.
+    return [[0, 0, 0, 255]] if not @engineData? or not @styles().FillColor?
+
+    @styles().FillColor.map (s) ->
+      values = s.Values.map (v) -> Math.round(v * 255)
+      values.push values.shift() # Change ARGB -> RGBA for consistency
+      values
+
   styles: ->
     return {} unless @engineData?
     return @_styles if @_styles?