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Modify luminance calculation and extract related functions into single files (#24586)

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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>
This commit is contained in:
Hester Gong 2023-05-10 19:19:03 +08:00 • committed by GitHub
parent 0ca5adee16
commit ea7954f069
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GPG key ID: 4AEE18F83AFDEB23
10 changed files with 238 additions and 81 deletions
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27
models/issues/label.go
View file

@ -159,33 +159,6 @@ func (l *Label) BelongsToRepo() bool {
return l.RepoID > 0
}
// Get color as RGB values in 0..255 range
func (l *Label) ColorRGB() (float64, float64, float64, error) {
color, err := strconv.ParseUint(l.Color[1:], 16, 64)
if err != nil {
return 0, 0, 0, err
}
r := float64(uint8(0xFF & (uint32(color) >> 16)))
g := float64(uint8(0xFF & (uint32(color) >> 8)))
b := float64(uint8(0xFF & uint32(color)))
return r, g, b, nil
}
// Determine if label text should be light or dark to be readable on background color
func (l *Label) UseLightTextColor() bool {
if strings.HasPrefix(l.Color, "#") {
if r, g, b, err := l.ColorRGB(); err == nil {
// Perceived brightness from: https://www.w3.org/TR/AERT/#color-contrast
// In the future WCAG 3 APCA may be a better solution
brightness := (0.299*r + 0.587*g + 0.114*b) / 255
return brightness < 0.35
}
}
return false
}
// Return scope substring of label name, or empty string if none exists
func (l *Label) ExclusiveScope() string {
if !l.Exclusive {