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61 lines
1.3 KiB
61 lines
1.3 KiB
package matrix
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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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func init() {
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colornames.Map["amber"] = color.RGBA{R: 0xff, G: 0x7f, A: 0xff}
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}
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func adjustBrightness(c color.RGBA, f uint32) color.RGBA {
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if f >= 0x0100 {
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return c
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}
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return color.RGBA{
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R: uint8((uint32(c.R) * f) >> 8),
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G: uint8((uint32(c.G) * f) >> 8),
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B: uint8((uint32(c.B) * f) >> 8),
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A: c.A,
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}
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}
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func parseColor(s string) (color.RGBA, error) {
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if len(s) == 0 {
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return colornames.White, nil
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}
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s = strings.Replace(s, " ", "", -1)
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switch {
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case s[0] == '#':
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switch len(s) {
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case 4:
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var c = color.RGBA{A: 0xff}
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_, err := fmt.Sscanf(s, "#%1x%1x%1x", &c.R, &c.G, &c.B)
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c.R *= 0x11
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c.G *= 0x11
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c.B *= 0x11
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return c, err
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case 7:
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var c = color.RGBA{A: 0xff}
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_, err := fmt.Sscanf(s, "#%02x%02x%02x", &c.R, &c.G, &c.B)
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return c, err
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}
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case strings.HasPrefix(s, "rgb("):
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var c = color.RGBA{A: 0xff}
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_, err := fmt.Sscanf(s, "rgb(%d,%d,%d)", &c.R, &c.G, &c.B)
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return c, err
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case strings.HasPrefix(s, "rgba("):
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var c color.RGBA
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_, err := fmt.Sscanf(s, "rgba(%d,%d,%d,%d)", &c.R, &c.G, &c.B, &c.A)
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return c, err
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default:
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if c, ok := colornames.Map[strings.ToLower(s)]; ok {
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return c, nil
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}
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}
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return colornames.White, fmt.Errorf("matrix: unknown color %q", s)
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}
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