forked from NYANDEV/forgejo
Modify luminance calculation and extract related functions into single files (#24586)
Close #24508 Main changes: As discussed in the issue 1. Change luminance calculation function to use [Relative Luminance](https://www.w3.org/WAI/GL/wiki/Relative_luminance) 2. Move the luminance related functions into color.go/color.js 3. Add tests for both the files (Not sure if test cases are too many now) Before (tests included by `UseLightTextOnBackground` are labels started with `##`): https://try.gitea.io/HesterG/testrepo/labels After: <img width="1307" alt="Screen Shot 2023-05-08 at 13 37 55" src="https://user-images.githubusercontent.com/17645053/236742562-fdfc3a4d-2fab-466b-9613-96f2bf96b4bc.png"> <img width="1289" alt="Screen Shot 2023-05-08 at 13 38 06" src="https://user-images.githubusercontent.com/17645053/236742570-022db68e-cec0-43bb-888a-fc54f5332cc3.png"> <img width="1299" alt="Screen Shot 2023-05-08 at 13 38 20" src="https://user-images.githubusercontent.com/17645053/236742572-9af1de45-fb7f-460b-828d-ba25fae20f51.png"> --------- Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: Giteabot <teabot@gitea.io>
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10 changed files with 238 additions and 81 deletions
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@ -159,33 +159,6 @@ func (l *Label) BelongsToRepo() bool {
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return l.RepoID > 0
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}
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// Get color as RGB values in 0..255 range
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func (l *Label) ColorRGB() (float64, float64, float64, error) {
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color, err := strconv.ParseUint(l.Color[1:], 16, 64)
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if err != nil {
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return 0, 0, 0, err
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}
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r := float64(uint8(0xFF & (uint32(color) >> 16)))
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g := float64(uint8(0xFF & (uint32(color) >> 8)))
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b := float64(uint8(0xFF & uint32(color)))
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return r, g, b, nil
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}
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// Determine if label text should be light or dark to be readable on background color
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func (l *Label) UseLightTextColor() bool {
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if strings.HasPrefix(l.Color, "#") {
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if r, g, b, err := l.ColorRGB(); err == nil {
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// Perceived brightness from: https://www.w3.org/TR/AERT/#color-contrast
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// In the future WCAG 3 APCA may be a better solution
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brightness := (0.299*r + 0.587*g + 0.114*b) / 255
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return brightness < 0.35
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}
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}
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return false
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}
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// Return scope substring of label name, or empty string if none exists
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func (l *Label) ExclusiveScope() string {
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if !l.Exclusive {
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