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refactor lab colors

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This commit is contained in:
Jake Stewart
2026-02-03 19:37:38 +08:00
committed by Mitchell Hashimoto
parent fad72e0ed1
commit 5f89228a7a
2 changed files with 81 additions and 68 deletions
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82
src/config/Config.zig
View File

@@ -22,6 +22,7 @@ const fontpkg = @import("../font/main.zig");
const inputpkg = @import("../input.zig");
const internal_os = @import("../os/main.zig");
const cli = @import("../cli.zig");
const Lab = @import("../lab.zig").Lab;
const conditional = @import("conditional.zig");
const Conditional = conditional.Conditional;
@@ -5620,25 +5621,26 @@ pub const Palette = struct {
) terminal.color.Palette {
var result = self.value;
var base8_lab: [8]Lab = undefined;
for (0..8) |i| base8_lab[i] = rgbToLab(result[i]);
const bg_lab = rgbToLab(bg);
const fg_lab = rgbToLab(fg);
for (0..8) |i| base8_lab[i] = Lab.fromTerminalRgb(result[i]);
const bg_lab = Lab.fromTerminalRgb(bg);
const fg_lab = Lab.fromTerminalRgb(fg);
var idx: usize = 16;
for (0..6) |ri| {
const tr = @as(f32, @floatFromInt(ri)) / 5.0;
const c0 = lerpLab(tr, bg_lab, base8_lab[1]);
const c1 = lerpLab(tr, base8_lab[2], base8_lab[3]);
const c2 = lerpLab(tr, base8_lab[4], base8_lab[5]);
const c3 = lerpLab(tr, base8_lab[6], fg_lab);
const c0 = Lab.lerp(tr, bg_lab, base8_lab[1]);
const c1 = Lab.lerp(tr, base8_lab[2], base8_lab[3]);
const c2 = Lab.lerp(tr, base8_lab[4], base8_lab[5]);
const c3 = Lab.lerp(tr, base8_lab[6], fg_lab);
for (0..6) |gi| {
const tg = @as(f32, @floatFromInt(gi)) / 5.0;
const c4 = lerpLab(tg, c0, c1);
const c5 = lerpLab(tg, c2, c3);
const c4 = Lab.lerp(tg, c0, c1);
const c5 = Lab.lerp(tg, c2, c3);
for (0..6) |bi| {
if (!self.mask.isSet(idx)) {
const c6 = lerpLab(@as(f32, @floatFromInt(bi)) / 5.0, c4, c5);
result[idx] = labToRgb(c6);
const c6 = Lab.lerp(
@as(f32, @floatFromInt(bi)) / 5.0, c4, c5);
result[idx] = c6.toTerminalRgb();
}
idx += 1;
}
@@ -5648,7 +5650,7 @@ pub const Palette = struct {
for (0..24) |i| {
const t = @as(f32, @floatFromInt(i + 1)) / 25.0;
if (!self.mask.isSet(idx)) {
result[idx] = labToRgb(lerpLab(t, bg_lab, fg_lab));
result[idx] = Lab.lerp(t, bg_lab, fg_lab).toTerminalRgb();
}
idx += 1;
}
@@ -10486,59 +10488,3 @@ test "compatibility: window new-window" {
}
}
const Lab = struct { l: f32, a: f32, b: f32 };
fn rgbToLab(rgb: terminal.color.RGB) Lab {
var r: f32 = @as(f32, @floatFromInt(rgb.r)) / 255.0;
var g: f32 = @as(f32, @floatFromInt(rgb.g)) / 255.0;
var b: f32 = @as(f32, @floatFromInt(rgb.b)) / 255.0;
r = if (r > 0.04045) std.math.pow(f32, (r + 0.055) / 1.055, 2.4) else r / 12.92;
g = if (g > 0.04045) std.math.pow(f32, (g + 0.055) / 1.055, 2.4) else g / 12.92;
b = if (b > 0.04045) std.math.pow(f32, (b + 0.055) / 1.055, 2.4) else b / 12.92;
var x = (r * 0.4124564 + g * 0.3575761 + b * 0.1804375) / 0.95047;
var y = r * 0.2126729 + g * 0.7151522 + b * 0.0721750;
var z = (r * 0.0193339 + g * 0.1191920 + b * 0.9503041) / 1.08883;
x = if (x > 0.008856) std.math.cbrt(x) else 7.787 * x + 16.0 / 116.0;
y = if (y > 0.008856) std.math.cbrt(y) else 7.787 * y + 16.0 / 116.0;
z = if (z > 0.008856) std.math.cbrt(z) else 7.787 * z + 16.0 / 116.0;
return .{ .l = 116.0 * y - 16.0, .a = 500.0 * (x - y), .b = 200.0 * (y - z) };
}
fn labToRgb(lab: Lab) terminal.color.RGB {
const y = (lab.l + 16.0) / 116.0;
const x = lab.a / 500.0 + y;
const z = y - lab.b / 200.0;
const x3 = x * x * x;
const y3 = y * y * y;
const z3 = z * z * z;
const xf = (if (x3 > 0.008856) x3 else (x - 16.0 / 116.0) / 7.787) * 0.95047;
const yf = if (y3 > 0.008856) y3 else (y - 16.0 / 116.0) / 7.787;
const zf = (if (z3 > 0.008856) z3 else (z - 16.0 / 116.0) / 7.787) * 1.08883;
var r = xf * 3.2404542 - yf * 1.5371385 - zf * 0.4985314;
var g = -xf * 0.9692660 + yf * 1.8760108 + zf * 0.0415560;
var b = xf * 0.0556434 - yf * 0.2040259 + zf * 1.0572252;
r = if (r > 0.0031308) 1.055 * std.math.pow(f32, r, 1.0 / 2.4) - 0.055 else 12.92 * r;
g = if (g > 0.0031308) 1.055 * std.math.pow(f32, g, 1.0 / 2.4) - 0.055 else 12.92 * g;
b = if (b > 0.0031308) 1.055 * std.math.pow(f32, b, 1.0 / 2.4) - 0.055 else 12.92 * b;
return .{
.r = @intFromFloat(@min(@max(r, 0.0), 1.0) * 255.0 + 0.5),
.g = @intFromFloat(@min(@max(g, 0.0), 1.0) * 255.0 + 0.5),
.b = @intFromFloat(@min(@max(b, 0.0), 1.0) * 255.0 + 0.5),
};
}
fn lerpLab(t: f32, a: Lab, b: Lab) Lab {
return .{
.l = a.l + t * (b.l - a.l),
.a = a.a + t * (b.a - a.a),
.b = a.b + t * (b.b - a.b)
};
}

67
src/lab.zig Normal file
View File

@@ -0,0 +1,67 @@
const terminal = @import("./terminal/main.zig");
const std = @import("std");
pub const Lab = struct {
l: f32,
a: f32,
b: f32,
pub fn fromTerminalRgb(rgb: terminal.color.RGB) Lab {
var r: f32 = @as(f32, @floatFromInt(rgb.r)) / 255.0;
var g: f32 = @as(f32, @floatFromInt(rgb.g)) / 255.0;
var b: f32 = @as(f32, @floatFromInt(rgb.b)) / 255.0;
r = if (r > 0.04045) std.math.pow(f32, (r + 0.055) / 1.055, 2.4) else r / 12.92;
g = if (g > 0.04045) std.math.pow(f32, (g + 0.055) / 1.055, 2.4) else g / 12.92;
b = if (b > 0.04045) std.math.pow(f32, (b + 0.055) / 1.055, 2.4) else b / 12.92;
var x = (r * 0.4124564 + g * 0.3575761 + b * 0.1804375) / 0.95047;
var y = r * 0.2126729 + g * 0.7151522 + b * 0.0721750;
var z = (r * 0.0193339 + g * 0.1191920 + b * 0.9503041) / 1.08883;
x = if (x > 0.008856) std.math.cbrt(x) else 7.787 * x + 16.0 / 116.0;
y = if (y > 0.008856) std.math.cbrt(y) else 7.787 * y + 16.0 / 116.0;
z = if (z > 0.008856) std.math.cbrt(z) else 7.787 * z + 16.0 / 116.0;
return .{ .l = 116.0 * y - 16.0, .a = 500.0 * (x - y), .b = 200.0 * (y - z) };
}
pub fn toTerminalRgb(self: Lab) terminal.color.RGB {
const y = (self.l + 16.0) / 116.0;
const x = self.a / 500.0 + y;
const z = y - self.b / 200.0;
const x3 = x * x * x;
const y3 = y * y * y;
const z3 = z * z * z;
const xf = (if (x3 > 0.008856) x3 else (x - 16.0 / 116.0) / 7.787) * 0.95047;
const yf = if (y3 > 0.008856) y3 else (y - 16.0 / 116.0) / 7.787;
const zf = (if (z3 > 0.008856) z3 else (z - 16.0 / 116.0) / 7.787) * 1.08883;
var r = xf * 3.2404542 - yf * 1.5371385 - zf * 0.4985314;
var g = -xf * 0.9692660 + yf * 1.8760108 + zf * 0.0415560;
var b = xf * 0.0556434 - yf * 0.2040259 + zf * 1.0572252;
r = if (r > 0.0031308) 1.055 * std.math.pow(f32, r, 1.0 / 2.4) - 0.055 else 12.92 * r;
g = if (g > 0.0031308) 1.055 * std.math.pow(f32, g, 1.0 / 2.4) - 0.055 else 12.92 * g;
b = if (b > 0.0031308) 1.055 * std.math.pow(f32, b, 1.0 / 2.4) - 0.055 else 12.92 * b;
return .{
.r = @intFromFloat(@min(@max(r, 0.0), 1.0) * 255.0 + 0.5),
.g = @intFromFloat(@min(@max(g, 0.0), 1.0) * 255.0 + 0.5),
.b = @intFromFloat(@min(@max(b, 0.0), 1.0) * 255.0 + 0.5),
};
}
pub fn lerp(t: f32, a: Lab, b: Lab) Lab {
return .{
.l = a.l + t * (b.l - a.l),
.a = a.a + t * (b.a - a.a),
.b = a.b + t * (b.b - a.b)
};
}
};