func toPaletted(o *ora.ORA, name string, palette color.Palette) (*image.Paletted, error) {
var p *image.Paletted
if l := o.Layer(name); l != nil {
p = image.NewPaletted(o.Bounds(), palette)
i, err := l.Image()
if err != nil {
return nil, err
}
draw.Draw(p, image.Rect(0, 0, p.Bounds().Max.X, p.Bounds().Max.Y), i, image.Point{}, draw.Src)
}
return p, nil
}
func toGray(o *ora.ORA, name string) (*image.Gray, error) {
var p *image.Gray
if l := o.Layer(name); l != nil {
p = image.NewGray(o.Bounds())
i, err := l.Image()
if err != nil {
return nil, err
}
draw.Draw(p, image.Rect(0, 0, p.Bounds().Max.X, p.Bounds().Max.Y), i, image.Point{}, draw.Src)
}
return p, nil
}