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Actually compute proper foreground color for labels (#16729)

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Clar Fon 2021-08-25 13:55:47 -04:00 • committed by GitHub
parent 20efc6b56c
commit 29b971b6d5
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2 changed files with 53 additions and 12 deletions
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29
web_src/js/components/ContextPopup.vue
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@ -24,6 +24,22 @@ import {SvgIcon} from '../svg.js';
const {AppSubUrl} = window.config;
// NOTE: see models/issue_label.go for similar implementation
const srgbToLinear = (color) => {
color /= 255;
if (color <= 0.04045) {
return color / 12.92;
}
return ((color + 0.055) / 1.055) ** 2.4;
};
const luminance = (colorString) => {
const r = srgbToLinear(parseInt(colorString.substring(0, 2), 16));
const g = srgbToLinear(parseInt(colorString.substring(2, 4), 16));
const b = srgbToLinear(parseInt(colorString.substring(4, 6), 16));
return 0.2126 * r + 0.7152 * g + 0.0722 * b;
};
const luminanceThreshold = 0.179;
export default {
name: 'ContextPopup',
@ -74,14 +90,13 @@ export default {
labels() {
return this.issue.labels.map((label) => {
const red = parseInt(label.color.substring(0, 2), 16);
const green = parseInt(label.color.substring(2, 4), 16);
const blue = parseInt(label.color.substring(4, 6), 16);
let color = '#ffffff';
if ((red * 0.299 + green * 0.587 + blue * 0.114) > 125) {
color = '#000000';
let textColor;
if (luminance(label.color) < luminanceThreshold) {
textColor = '#ffffff';
} else {
textColor = '#000000';
}
return {name: label.name, color: `#${label.color}`, textColor: color};
return {name: label.name, color: `#${label.color}`, textColor};
});
}
},