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enhance(ui): improve luminance calculations (#38682)

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silverwind
2026-08-06 08:41:40 +02:00
committed by GitHub
parent cc0d348d84
commit 92ac357b1a
5 changed files with 45 additions and 22 deletions
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modules/templates/util_render.go
+7 -7
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@@ -120,15 +120,15 @@ func (ut *RenderUtils) RenderLabel(label *issues_model.Label) template.HTML {
itemHTML := ut.RenderEmoji(label.Name[len(labelScope)+1:])
// Make scope and item background colors slightly darker and lighter respectively.
// More contrast needed with higher luminance, empirically tweaked.
luminance := util.GetRelativeLuminance(label.Color)
contrast := 0.01 + luminance*0.03
// More contrast needed with higher brightness, empirically tweaked.
brightness := util.GetPerceivedBrightness(label.Color)
contrast := 0.01 + brightness*0.03
// Ensure we add the same amount of contrast also near 0 and 1.
darken := contrast + math.Max(luminance+contrast-1.0, 0.0)
lighten := contrast + math.Max(contrast-luminance, 0.0)
darken := contrast + math.Max(brightness+contrast-1.0, 0.0)
lighten := contrast + math.Max(contrast-brightness, 0.0)
// Compute the factor to keep RGB values proportional.
darkenFactor := math.Max(luminance-darken, 0.0) / math.Max(luminance, 1.0/255.0)
lightenFactor := math.Min(luminance+lighten, 1.0) / math.Max(luminance, 1.0/255.0)
darkenFactor := math.Max(brightness-darken, 0.0) / math.Max(brightness, 1.0/255.0)
lightenFactor := math.Min(brightness+lighten, 1.0) / math.Max(brightness, 1.0/255.0)
r, g, b := util.HexToRBGColor(label.Color)
scopeBytes := []byte{