package control9 import (	"bitbucket.org/mischief/draw9"	"bitbucket.org/mischief/draw9/color9"	"image") type imagecache map[string]*draw9.Image var (	coltab = map[string]color9.Color{		"red":        color9.DRed,		"blue":       color9.DBlue,		"yellow":     color9.DYellow,		"paleyellow": color9.DPaleyellow,	} 	icache imagecache = map[string]*draw9.Image{}) func geti(name string) *draw9.Image {	return icache[name]} // InitControlset must be called before any other control function to allocate colors.func InitControlset(d *draw9.Display) error {	var err error	icache["opaque"] = d.Opaque	icache["transparent"] = d.Transparent	icache["white"] = d.White	icache["black"] = d.Black	for n, c := range coltab {		icache[n], err = d.AllocImage(image.Rect(0, 0, 1, 1), d.ScreenImage.Pix, true, c)		if err != nil {			return err		}	} 	return err}