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zeekayandHanzo Dev
aa87442fdd
Source files keep their SPDX-License-Identifier and Hanzo copyright line; the Gitea, Gogs and LFS Test Server copyrights they used to repeat now live once in NOTICE, alongside LICENSE. The header lint accepts any copyright line above the SPDX line, so it no longer demands an upstream one. Co-authored-by: Hanzo Dev <[email protected]>
60 lines
1.9 KiB
Go
60 lines
1.9 KiB
Go
// Copyright 2026 Hanzo AI, Inc. All rights reserved.
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// SPDX-License-Identifier: MIT
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package util
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import (
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"fmt"
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"strconv"
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"strings"
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)
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// HexToRBGColor parses color as RGB values in 0..255 range from the hex color string (with or without #)
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func HexToRBGColor(colorString string) (float64, float64, float64) {
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hexString := colorString
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if strings.HasPrefix(colorString, "#") {
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hexString = colorString[1:]
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}
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// only support transfer of rgb, rgba, rrggbb and rrggbbaa
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// if not in these formats, use default values 0, 0, 0
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if len(hexString) != 3 && len(hexString) != 4 && len(hexString) != 6 && len(hexString) != 8 {
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return 0, 0, 0
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}
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if len(hexString) == 3 || len(hexString) == 4 {
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hexString = fmt.Sprintf("%c%c%c%c%c%c", hexString[0], hexString[0], hexString[1], hexString[1], hexString[2], hexString[2])
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}
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if len(hexString) == 8 {
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hexString = hexString[0:6]
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}
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color, err := strconv.ParseUint(hexString, 16, 32)
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color32 := uint32(color)
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if err != nil {
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return 0, 0, 0
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}
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r := float64(uint8(0xFF & (color32 >> 16)))
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g := float64(uint8(0xFF & (color32 >> 8)))
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b := float64(uint8(0xFF & color32))
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return r, g, b
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}
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// GetRelativeLuminance returns relative luminance for a SRGB color - https://en.wikipedia.org/wiki/Relative_luminance
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// Keep this in sync with web_src/js/utils/color.js
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func GetRelativeLuminance(color string) float64 {
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r, g, b := HexToRBGColor(color)
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return (0.2126729*r + 0.7151522*g + 0.0721750*b) / 255
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}
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func UseLightText(backgroundColor string) bool {
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return GetRelativeLuminance(backgroundColor) < 0.453
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}
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// ContrastColor returns a black or white foreground color that the highest contrast ratio.
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// In the future, the APCA contrast function, or CSS `contrast-color` will be better.
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// https://github.com/color-js/color.js/blob/eb7b53f7a13bb716ec8b28c7a56f052cd599acd9/src/contrast/APCA.js#L42
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func ContrastColor(backgroundColor string) string {
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if UseLightText(backgroundColor) {
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return "#fff"
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}
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return "#000"
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}
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