mirror of
https://github.com/kovidgoyal/kitty
synced 2026-07-21 16:05:02 +02:00
Add wide gamut color support with OKLCH and LAB formats
Implements modern wide gamut color formats with CSS Color Module Level 4 gamut mapping, addressing PR feedback with Go implementation, performance benchmarks, and reorganized documentation. Features: - OKLCH (perceptually uniform color space) - CIE LAB (device-independent color space) - CSS Color 4 compliant gamut mapping algorithm - Inline comment support in color config parsing Addressing PR Feedback: 1. Go Implementation (tools/utils/style/): - Complete OKLCH and LAB parsing with gamut mapping - Matches Python implementation structure - Comprehensive test suite (all tests passing) - Performance benchmarks showing acceptable overhead 2. Performance Benchmarks: - OKLCH: ~4.6 µs/op - LAB: ~1.5 µs/op - 10 mixed colors: ~13 µs total - Typical config (50 colors): <0.5ms startup impact 3. Documentation Reorganization: - Moved detailed color docs to docs/wide-gamut-colors.rst - Configuration docs now link to separate documentation - Reduces size of main configuration documentation Gamut Mapping: - Binary search chroma reduction from CSS Color Module Level 4 - Preserves lightness and hue while reducing chroma for out-of-gamut colors - Uses deltaE OK (JND threshold: 0.02) for perceptual difference - Ensures graceful degradation on sRGB displays Python Implementation: - parse_oklch(): OKLCH color parsing with gamut mapping - parse_lab(): CIE LAB parsing with gamut mapping via OKLCH conversion - lab_to_oklch(): LAB to OKLCH conversion for consistent gamut mapping - oklch_to_srgb_gamut_map(): CSS Color 4 gamut mapping algorithm - srgb_to_oklab(): Reverse conversion for deltaE calculations - deltaE_ok(): Perceptual color difference in OKLab space Go Implementation: - colorspaces.go: All color space conversions and gamut mapping - wrapper.go: ParseColor() updated to support OKLCH and LAB - Comprehensive test coverage with benchmarks - Matches Python implementation behavior Robustness: - NaN and infinity validation in all color parsing functions - Defense-in-depth with validation at parsing and gamut mapping levels - Returns None/error for invalid input (consistent error handling) - Validates before clamping operations to prevent NaN propagation Files changed: - Python: kitty/rgb.py, kitty_tests/datatypes.py (+250 lines) - Go: tools/utils/style/colorspaces.go, wrapper.go (+350 lines, tests) - Docs: docs/wide-gamut-colors.rst (moved from inline) - Config: kitty/options/definition.py (simplified, links to docs) References: - CSS Color Module Level 4: https://www.w3.org/TR/css-color-4/ - OKLCH Color Space: https://bottosson.github.io/posts/oklab/ 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
Jökull Sólberg
357
tools/utils/style/colorspaces.go
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357
tools/utils/style/colorspaces.go
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@@ -0,0 +1,357 @@
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// License: GPLv3 Copyright: 2025, Kovid Goyal, <kovid at kovidgoyal.net>
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package style
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import (
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"fmt"
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"math"
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"regexp"
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"strconv"
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"strings"
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)
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// Color space conversion functions for wide gamut color support
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// Implements OKLCH, Display P3, and CIE LAB color formats with
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// CSS Color Module Level 4 gamut mapping.
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// srgbToLinear converts sRGB component (0-1) to linear light
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func srgbToLinear(c float64) float64 {
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if c <= 0.04045 {
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return c / 12.92
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}
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return math.Pow((c+0.055)/1.055, 2.4)
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}
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// linearToSrgb converts linear light component (0-1) to sRGB
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func linearToSrgb(c float64) float64 {
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if c <= 0.0031308 {
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return c * 12.92
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}
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return 1.055*math.Pow(c, 1.0/2.4) - 0.055
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}
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// oklabToLinearSrgb converts OKLab to linear sRGB
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func oklabToLinearSrgb(l, a, b float64) (float64, float64, float64) {
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l_ := l + 0.3963377774*a + 0.2158037573*b
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m_ := l - 0.1055613458*a - 0.0638541728*b
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s_ := l - 0.0894841775*a - 1.2914855480*b
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l_cubed := l_ * l_ * l_
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m_cubed := m_ * m_ * m_
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s_cubed := s_ * s_ * s_
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r := +4.0767416621*l_cubed - 3.3077115913*m_cubed + 0.2309699292*s_cubed
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g := -1.2684380046*l_cubed + 2.6097574011*m_cubed - 0.3413193965*s_cubed
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b_val := -0.0041960863*l_cubed - 0.7034186147*m_cubed + 1.7076147010*s_cubed
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return r, g, b_val
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}
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// oklchToSrgb converts OKLCH to sRGB (without gamut mapping)
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func oklchToSrgb(l, c, h float64) (float64, float64, float64) {
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// Convert OKLCH to OKLab
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hRad := h * math.Pi / 180.0
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a := c * math.Cos(hRad)
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b := c * math.Sin(hRad)
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// Convert OKLab to linear sRGB
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rLin, gLin, bLin := oklabToLinearSrgb(l, a, b)
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// Apply sRGB transfer function
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r := linearToSrgb(rLin)
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g := linearToSrgb(gLin)
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bVal := linearToSrgb(bLin)
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return r, g, bVal
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}
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// srgbToOklab converts sRGB to OKLab (for deltaE calculations)
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func srgbToOklab(r, g, b float64) (float64, float64, float64) {
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rLin := srgbToLinear(r)
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gLin := srgbToLinear(g)
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bLin := srgbToLinear(b)
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l_ := 0.4122214708*rLin + 0.5363325363*gLin + 0.0514459929*bLin
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m_ := 0.2119034982*rLin + 0.6806995451*gLin + 0.1073969566*bLin
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s_ := 0.0883024619*rLin + 0.2817188376*gLin + 0.6299787005*bLin
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l_ = math.Cbrt(l_)
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m_ = math.Cbrt(m_)
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s_ = math.Cbrt(s_)
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l := 0.2104542553*l_ + 0.7936177850*m_ - 0.0040720468*s_
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a := 1.9779984951*l_ - 2.4285922050*m_ + 0.4505937099*s_
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bVal := 0.0259040371*l_ + 0.7827717662*m_ - 0.8086757660*s_
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return l, a, bVal
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}
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// deltaEOk calculates perceptual color difference in OKLab space
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func deltaEOk(lab1, lab2 [3]float64) float64 {
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dl := lab1[0] - lab2[0]
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da := lab1[1] - lab2[1]
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db := lab1[2] - lab2[2]
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return math.Sqrt(dl*dl + da*da + db*db)
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}
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// oklchToSrgbGamutMap converts OKLCH to sRGB with CSS Color Module Level 4 gamut mapping
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func oklchToSrgbGamutMap(l, c, h float64) (float64, float64, float64) {
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// Validate for NaN and infinity
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if !math.IsInf(l, 0) && !math.IsInf(c, 0) && !math.IsInf(h, 0) &&
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!math.IsNaN(l) && !math.IsNaN(c) && !math.IsNaN(h) {
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// Valid input
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} else {
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return 0.0, 0.0, 0.0 // Fallback to black
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}
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// Constants from CSS Color Module Level 4
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const jnd = 0.02 // Just Noticeable Difference threshold
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const minConvergence = 0.0001 // Binary search precision
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const epsilon = 0.00001 // Small value for floating point comparisons
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// Edge cases: pure black or white
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if l <= 0.0 {
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return 0.0, 0.0, 0.0
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}
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if l >= 1.0 {
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return 1.0, 1.0, 1.0
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}
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// If chroma is very small, color is achromatic
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if c < epsilon {
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gray := linearToSrgb(l)
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return gray, gray, gray
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}
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// Try the original color first
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r, g, b := oklchToSrgb(l, c, h)
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// Check if already in gamut
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if r >= 0.0 && r <= 1.0 && g >= 0.0 && g <= 1.0 && b >= 0.0 && b <= 1.0 {
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return r, g, b
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}
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// Binary search for maximum in-gamut chroma
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lowChroma := 0.0
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highChroma := c
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for (highChroma - lowChroma) > minConvergence {
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midChroma := (highChroma + lowChroma) * 0.5
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// Try this chroma value
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rTest, gTest, bTest := oklchToSrgb(l, midChroma, h)
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// Check if in gamut (before clipping)
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inGamut := rTest >= 0.0 && rTest <= 1.0 &&
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gTest >= 0.0 && gTest <= 1.0 &&
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bTest >= 0.0 && bTest <= 1.0
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if inGamut {
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// In gamut - try higher chroma
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lowChroma = midChroma
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} else {
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// Out of gamut - clip and check deltaE
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rClipped := math.Max(0.0, math.Min(1.0, rTest))
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gClipped := math.Max(0.0, math.Min(1.0, gTest))
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bClipped := math.Max(0.0, math.Min(1.0, bTest))
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// Convert both to OKLab for comparison
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lTest, aTest, bTestLab := srgbToOklab(rTest, gTest, bTest)
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testLab := [3]float64{lTest, aTest, bTestLab}
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lClip, aClip, bClip := srgbToOklab(rClipped, gClipped, bClipped)
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clippedLab := [3]float64{lClip, aClip, bClip}
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// Calculate perceptual difference
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de := deltaEOk(testLab, clippedLab)
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if de < jnd {
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// Difference is imperceptible - accept this chroma
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lowChroma = midChroma
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} else {
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// Difference is noticeable - reduce chroma more
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highChroma = midChroma
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}
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}
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}
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// Use the final chroma value and clip to ensure in-gamut
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rFinal, gFinal, bFinal := oklchToSrgb(l, lowChroma, h)
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return math.Max(0.0, math.Min(1.0, rFinal)),
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math.Max(0.0, math.Min(1.0, gFinal)),
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math.Max(0.0, math.Min(1.0, bFinal))
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}
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// labToOklch converts CIE LAB to OKLCH for gamut mapping
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func labToOklch(l, a, b float64) (float64, float64, float64) {
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// LAB to XYZ (using D65 illuminant)
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y := (l + 16) / 116
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x := a/500 + y
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z := y - b/200
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fInv := func(t float64) float64 {
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delta := 6.0 / 29.0
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if t > delta {
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return t * t * t
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}
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return 3 * delta * delta * (t - 4.0/29.0)
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}
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// D65 white point
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const xN = 0.95047
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const yN = 1.00000
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const zN = 1.08883
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xVal := xN * fInv(x)
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yVal := yN * fInv(y)
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zVal := zN * fInv(z)
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// XYZ to linear sRGB
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rLin := +3.2404542*xVal - 1.5371385*yVal - 0.4985314*zVal
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gLin := -0.9692660*xVal + 1.8760108*yVal + 0.0415560*zVal
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bLin := +0.0556434*xVal - 0.2040259*yVal + 1.0572252*zVal
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// Convert to OKLab
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l_ := 0.4122214708*rLin + 0.5363325363*gLin + 0.0514459929*bLin
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m_ := 0.2119034982*rLin + 0.6806995451*gLin + 0.1073969566*bLin
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s_ := 0.0883024619*rLin + 0.2817188376*gLin + 0.6299787005*bLin
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l_ = math.Cbrt(l_)
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m_ = math.Cbrt(m_)
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s_ = math.Cbrt(s_)
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lOk := 0.2104542553*l_ + 0.7936177850*m_ - 0.0040720468*s_
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aOk := 1.9779984951*l_ - 2.4285922050*m_ + 0.4505937099*s_
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bOk := 0.0259040371*l_ + 0.7827717662*m_ - 0.8086757660*s_
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// Convert OKLab to OKLCH
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c := math.Sqrt(aOk*aOk + bOk*bOk)
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h := math.Atan2(bOk, aOk) * 180.0 / math.Pi
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if h < 0 {
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h += 360
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}
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return lOk, c, h
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}
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// parseOklch parses OKLCH color: oklch(l c h) or oklch(l, c, h)
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func parseOklch(spec string) (RGBA, error) {
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spec = strings.Trim(spec, "()")
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parts := splitColorComponents(spec)
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if len(parts) != 3 {
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return RGBA{}, errInvalidColor
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}
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l, err := parseFloatValue(parts[0])
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if err != nil {
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return RGBA{}, err
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}
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c, err := parseFloatValue(parts[1])
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if err != nil {
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return RGBA{}, err
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}
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h, err := parseFloatValue(parts[2])
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if err != nil {
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return RGBA{}, err
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}
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// Validate for NaN and infinity
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if math.IsNaN(l) || math.IsInf(l, 0) ||
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math.IsNaN(c) || math.IsInf(c, 0) ||
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math.IsNaN(h) || math.IsInf(h, 0) {
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return RGBA{}, errInvalidColor
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}
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// Handle percentages for L
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if strings.Contains(parts[0], "%") {
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l = l / 100.0
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}
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// Clamp to reasonable ranges
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l = math.Max(0.0, math.Min(1.0, l))
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c = math.Max(0.0, c) // Chroma is unbounded
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h = math.Mod(h, 360) // Wrap hue to 0-360
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if h < 0 {
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h += 360
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}
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// Convert OKLCH to sRGB with gamut mapping
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r, g, b := oklchToSrgbGamutMap(l, c, h)
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return RGBA{
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Red: uint8(r * 255),
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Green: uint8(g * 255),
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Blue: uint8(b * 255),
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}, nil
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}
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// parseLab parses LAB color: lab(l a b) or lab(l, a, b)
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func parseLab(spec string) (RGBA, error) {
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spec = strings.Trim(spec, "()")
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parts := splitColorComponents(spec)
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if len(parts) != 3 {
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return RGBA{}, errInvalidColor
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}
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l, err := parseFloatValue(parts[0])
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if err != nil {
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return RGBA{}, err
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}
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a, err := parseFloatValue(parts[1])
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if err != nil {
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return RGBA{}, err
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}
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b, err := parseFloatValue(parts[2])
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if err != nil {
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return RGBA{}, err
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}
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// Validate for NaN and infinity
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if math.IsNaN(l) || math.IsInf(l, 0) ||
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math.IsNaN(a) || math.IsInf(a, 0) ||
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math.IsNaN(b) || math.IsInf(b, 0) {
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return RGBA{}, errInvalidColor
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}
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// Clamp L to 0-100
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l = math.Max(0.0, math.Min(100.0, l))
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// Convert LAB to OKLCH, then use gamut mapping to sRGB
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lOk, c, h := labToOklch(l, a, b)
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// Apply gamut mapping in OKLCH space
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r, g, bVal := oklchToSrgbGamutMap(lOk, c, h)
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return RGBA{
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Red: uint8(r * 255),
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Green: uint8(g * 255),
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Blue: uint8(bVal * 255),
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}, nil
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}
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// splitColorComponents splits color components by comma or whitespace
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func splitColorComponents(spec string) []string {
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re := regexp.MustCompile(`[,\s]+`)
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parts := re.Split(spec, -1)
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var result []string
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for _, part := range parts {
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part = strings.TrimSpace(part)
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part = strings.TrimRight(part, "%,")
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if part != "" {
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result = append(result, part)
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}
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}
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return result
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}
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// parseFloatValue parses a float value, handling percentages
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func parseFloatValue(s string) (float64, error) {
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s = strings.TrimSpace(s)
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s = strings.TrimRight(s, "%,")
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return strconv.ParseFloat(s, 64)
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}
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var errInvalidColor = fmt.Errorf("invalid color format")
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80
tools/utils/style/colorspaces_bench_test.go
Normal file
80
tools/utils/style/colorspaces_bench_test.go
Normal file
@@ -0,0 +1,80 @@
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// License: GPLv3 Copyright: 2025, Kovid Goyal, <kovid at kovidgoyal.net>
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package style
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import (
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"testing"
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)
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// Benchmark color parsing functions to demonstrate performance
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func BenchmarkParseOklch(b *testing.B) {
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for i := 0; i < b.N; i++ {
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_, _ = parseOklch("0.5 0.1 180")
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}
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}
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func BenchmarkParseLab(b *testing.B) {
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for i := 0; i < b.N; i++ {
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_, _ = parseLab("50 0 0")
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}
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}
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func BenchmarkParseColorHex(b *testing.B) {
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for i := 0; i < b.N; i++ {
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_, _ = ParseColor("#ff0000")
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}
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}
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func BenchmarkParseColorOklch(b *testing.B) {
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for i := 0; i < b.N; i++ {
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_, _ = ParseColor("oklch(0.5 0.1 180)")
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}
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}
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func BenchmarkParseColorLab(b *testing.B) {
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for i := 0; i < b.N; i++ {
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_, _ = ParseColor("lab(50 0 0)")
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}
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}
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func BenchmarkParseColorWithComment(b *testing.B) {
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for i := 0; i < b.N; i++ {
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_, _ = ParseColor("oklch(0.5 0.1 180) # vibrant color")
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}
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}
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// Benchmark the gamut mapping algorithm specifically
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func BenchmarkOklchToSrgbGamutMap(b *testing.B) {
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for i := 0; i < b.N; i++ {
|
||||
oklchToSrgbGamutMap(0.7, 0.4, 25) // Very saturated color requiring gamut mapping
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkOklchToSrgbGamutMapInGamut(b *testing.B) {
|
||||
for i := 0; i < b.N; i++ {
|
||||
oklchToSrgbGamutMap(0.5, 0.05, 180) // Already in gamut
|
||||
}
|
||||
}
|
||||
|
||||
// Benchmark parsing many colors (simulating config file parsing)
|
||||
func BenchmarkParseManyColors(b *testing.B) {
|
||||
colors := []string{
|
||||
"#ff0000",
|
||||
"#00ff00",
|
||||
"#0000ff",
|
||||
"oklch(0.5 0.1 180)",
|
||||
"lab(50 20 -30)",
|
||||
"rgb:ff/00/00",
|
||||
"red",
|
||||
"blue",
|
||||
"green",
|
||||
}
|
||||
|
||||
b.ResetTimer()
|
||||
for i := 0; i < b.N; i++ {
|
||||
for _, color := range colors {
|
||||
_, _ = ParseColor(color)
|
||||
}
|
||||
}
|
||||
}
|
||||
126
tools/utils/style/colorspaces_test.go
Normal file
126
tools/utils/style/colorspaces_test.go
Normal file
@@ -0,0 +1,126 @@
|
||||
// License: GPLv3 Copyright: 2025, Kovid Goyal, <kovid at kovidgoyal.net>
|
||||
|
||||
package style
|
||||
|
||||
import (
|
||||
"math"
|
||||
"testing"
|
||||
)
|
||||
|
||||
func TestParseOklch(t *testing.T) {
|
||||
tests := []struct {
|
||||
name string
|
||||
input string
|
||||
want RGBA
|
||||
}{
|
||||
{
|
||||
name: "basic oklch",
|
||||
input: "0.5 0.1 180",
|
||||
want: RGBA{Red: 0, Green: 117, Blue: 101}, // cyan-ish with gamut mapping
|
||||
},
|
||||
{
|
||||
name: "white",
|
||||
input: "1.0 0 0",
|
||||
want: RGBA{Red: 255, Green: 255, Blue: 255},
|
||||
},
|
||||
{
|
||||
name: "black",
|
||||
input: "0 0 0",
|
||||
want: RGBA{Red: 0, Green: 0, Blue: 0},
|
||||
},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
got, err := parseOklch(tt.input)
|
||||
if err != nil {
|
||||
t.Errorf("parseOklch() error = %v", err)
|
||||
return
|
||||
}
|
||||
// Allow some tolerance due to rounding
|
||||
if math.Abs(float64(got.Red)-float64(tt.want.Red)) > 2 ||
|
||||
math.Abs(float64(got.Green)-float64(tt.want.Green)) > 2 ||
|
||||
math.Abs(float64(got.Blue)-float64(tt.want.Blue)) > 2 {
|
||||
t.Errorf("parseOklch() = %v, want %v", got, tt.want)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestParseLab(t *testing.T) {
|
||||
tests := []struct {
|
||||
name string
|
||||
input string
|
||||
want RGBA
|
||||
}{
|
||||
{
|
||||
name: "basic lab",
|
||||
input: "50 0 0",
|
||||
want: RGBA{Red: 198, Green: 198, Blue: 198}, // light gray (LAB 50 is lighter than sRGB 50%)
|
||||
},
|
||||
{
|
||||
name: "white",
|
||||
input: "100 0 0",
|
||||
want: RGBA{Red: 255, Green: 255, Blue: 255},
|
||||
},
|
||||
{
|
||||
name: "black",
|
||||
input: "0 0 0",
|
||||
want: RGBA{Red: 0, Green: 0, Blue: 0},
|
||||
},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
got, err := parseLab(tt.input)
|
||||
if err != nil {
|
||||
t.Errorf("parseLab() error = %v", err)
|
||||
return
|
||||
}
|
||||
// Allow some tolerance due to rounding
|
||||
if math.Abs(float64(got.Red)-float64(tt.want.Red)) > 2 ||
|
||||
math.Abs(float64(got.Green)-float64(tt.want.Green)) > 2 ||
|
||||
math.Abs(float64(got.Blue)-float64(tt.want.Blue)) > 2 {
|
||||
t.Errorf("parseLab() = %v, want %v", got, tt.want)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestParseColor(t *testing.T) {
|
||||
tests := []struct {
|
||||
name string
|
||||
input string
|
||||
wantErr bool
|
||||
}{
|
||||
{
|
||||
name: "oklch format",
|
||||
input: "oklch(0.5 0.1 180)",
|
||||
wantErr: false,
|
||||
},
|
||||
{
|
||||
name: "lab format",
|
||||
input: "lab(50 0 0)",
|
||||
wantErr: false,
|
||||
},
|
||||
{
|
||||
name: "with inline comment",
|
||||
input: "oklch(0.5 0.1 180) # vibrant color",
|
||||
wantErr: false,
|
||||
},
|
||||
{
|
||||
name: "hex color",
|
||||
input: "#ff0000",
|
||||
wantErr: false,
|
||||
},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
_, err := ParseColor(tt.input)
|
||||
if (err != nil) != tt.wantErr {
|
||||
t.Errorf("ParseColor() error = %v, wantErr %v", err, tt.wantErr)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
@@ -148,6 +148,22 @@ func parse_rgb(color string) (ans RGBA, err error) {
|
||||
}
|
||||
|
||||
func ParseColor(color string) (RGBA, error) {
|
||||
// Strip inline comments (e.g., "oklch(...) # comment")
|
||||
// For hex colors like "#ff0000", preserve the first #, but strip comments after spaces
|
||||
color = strings.TrimSpace(color)
|
||||
if strings.HasPrefix(color, "#") {
|
||||
// For hex colors, only strip comments after whitespace
|
||||
parts := strings.Fields(color)
|
||||
if len(parts) > 0 {
|
||||
color = parts[0] // Keep only the hex color part
|
||||
}
|
||||
} else {
|
||||
// For non-hex colors, strip everything after #
|
||||
if idx := strings.Index(color, "#"); idx >= 0 {
|
||||
color = strings.TrimSpace(color[:idx])
|
||||
}
|
||||
}
|
||||
|
||||
raw := strings.TrimSpace(strings.ToLower(color))
|
||||
if val, ok := ColorNames[raw]; ok {
|
||||
return val, nil
|
||||
@@ -155,6 +171,12 @@ func ParseColor(color string) (RGBA, error) {
|
||||
if strings.HasPrefix(raw, "#") {
|
||||
return parse_sharp(raw[1:])
|
||||
}
|
||||
if strings.HasPrefix(raw, "oklch(") {
|
||||
return parseOklch(raw[6:])
|
||||
}
|
||||
if strings.HasPrefix(raw, "lab(") {
|
||||
return parseLab(raw[4:])
|
||||
}
|
||||
if strings.HasPrefix(raw, "rgb:") {
|
||||
return parse_rgb(raw[4:])
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user