Description
void 
swf_addcolor ( float r, float g, float b, float a )
     The swf_addcolor() function sets the global
     add color to the rgba color specified.
     This color is then used (implicitly) by the
     swf_placeobject(),
     swf_modifyobject() and the
     swf_addbuttonrecord() functions.  The color of
     the object will be add by the rgba values
     when the object is written to the screen.
    
Note: 
      The rgba values can be either positive or
      negative.