package zenutil import ( "fmt" "image/color" "strings" "golang.org/x/image/colornames" ) // ParseColor is internal. func ParseColor(s string) color.Color { if len(s) == 4 || len(s) == 5 { c := color.NRGBA{A: 0xf} n, _ := fmt.Sscanf(s, "#%1x%1x%1x%1x", &c.R, &c.G, &c.B, &c.A) c.R, c.G, c.B, c.A = c.R*0x11, c.G*0x11, c.B*0x11, c.A*0x11 if n >= 3 { return c } } if len(s) == 7 || len(s) == 9 { c := color.NRGBA{A: 0xff} n, _ := fmt.Sscanf(s, "#%02x%02x%02x%02x", &c.R, &c.G, &c.B, &c.A) if n >= 3 { return c } } if len(s) >= 10 { c := color.NRGBA{A: 0xff} if _, err := fmt.Sscanf(s, "rgb(%d,%d,%d)", &c.R, &c.G, &c.B); err == nil { return c } var a float32 if _, err := fmt.Sscanf(s, "rgba(%d,%d,%d,%f)", &c.R, &c.G, &c.B, &a); err == nil { switch { case a <= 0: c.A = 0 case a >= 1: c.A = 255 default: c.A = uint8(255*a + 0.5) } return c } } c, ok := colornames.Map[strings.ToLower(s)] if ok { return c } return nil } // UnparseColor is internal. func UnparseColor(c color.Color) string { n := color.NRGBAModel.Convert(c).(color.NRGBA) if n.A == 255 { return fmt.Sprintf("rgb(%d,%d,%d)", n.R, n.G, n.B) } else { return fmt.Sprintf("rgba(%d,%d,%d,%f)", n.R, n.G, n.B, float32(n.A)/255) } } // ColorEquals is internal. func ColorEquals(c1, c2 color.Color) bool { if c1 == nil || c2 == nil { return c1 == c2 } r1, g1, b1, a1 := c1.RGBA() r2, g2, b2, a2 := c2.RGBA() return r1 == r2 && g1 == g2 && b1 == b2 && a1 == a2 }