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