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Code Issues Releases Activity

Expose Colour.BrightenOrDarken (useful for #211).

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This commit is contained in:
Alec Thomas 2018-12-31 10:48:45 +11:00
parent 881a441774
commit 69c9a262c3
2 changed files with 10 additions and 9 deletions
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8
colour.go
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@ -92,6 +92,14 @@ func (c Colour) Brighten(factor float64) Colour {
return NewColour(uint8(r), uint8(g), uint8(b))
}
// BrightenOrDarken brightens a colour if it is < 0.5 brighteness or darkens if > 0.5 brightness.
func (c Colour) BrightenOrDarken(factor float64) Colour {
if c.Brightness() < 0.5 {
return c.Brighten(factor)
}
return c.Brighten(-factor)
}
// Brightness of the colour (roughly) in the range 0.0 to 1.0
func (c Colour) Brightness() float64 {
return (float64(c.Red()) + float64(c.Green()) + float64(c.Blue())) / 255.0 / 3.0

11
formatters/html/html.go
View File

@ -99,13 +99,6 @@ func (f *Formatter) Format(w io.Writer, style *chroma.Style, iterator chroma.Ite
return f.writeHTML(w, style, iterator.Tokens())
}
func brightenOrDarken(colour chroma.Colour, factor float64) chroma.Colour {
if colour.Brightness() < 0.5 {
return colour.Brighten(factor)
}
return colour.Brighten(-factor)
}
// Ensure that style entries exist for highlighting, etc.
func (f *Formatter) restyle(style *chroma.Style) (*chroma.Style, error) {
builder := style.Builder()
@ -113,13 +106,13 @@ func (f *Formatter) restyle(style *chroma.Style) (*chroma.Style, error) {
// If we don't have a line highlight colour, make one that is 10% brighter/darker than the background.
if !style.Has(chroma.LineHighlight) {
highlight := chroma.StyleEntry{Background: bg.Background}
highlight.Background = brightenOrDarken(highlight.Background, 0.1)
highlight.Background = highlight.Background.BrightenOrDarken(0.1)
builder.AddEntry(chroma.LineHighlight, highlight)
}
// If we don't have line numbers, use the text colour but 20% brighter/darker
if !style.Has(chroma.LineNumbers) {
text := chroma.StyleEntry{Colour: bg.Colour}
text.Colour = brightenOrDarken(text.Colour, 0.5)
text.Colour = text.Colour.BrightenOrDarken(0.5)
builder.AddEntry(chroma.LineNumbers, text)
builder.AddEntry(chroma.LineNumbersTable, text)
}