Commit 80ac29e7cdcfdc1728c92047ea571cb01dc9f626 | lib/zig/color

author	Meghan Denny <hello@nektro.net> 2023-09-14 20:22:25 -07:00
committer	Meghan Denny <hello@nektro.net> 2023-09-14 20:22:25 -07:00
log	80ac29e7cdcfdc1728c92047ea571cb01dc9f626
tree	d77b9784de4081d96791886e0f7abc280b06a308
parent	91c035aab08e631ab7592635ae945c4921cfc696

4 files changed, 49 insertions(+), 0 deletions(-)

HSL.zig created+26

...	...	@@ -0,0 +1,26 @@
	1	//! object representing a single color in the HSL colorspace with h channel value from 0-360 and s,l channel values from 0-1
	2
	3	const std = @import("std");
	4	const Self = @This();
	5
	6	h: f32, // hue
	7	s: f32, // saturation
	8	l: f32, // luminance
	9	a: f32, // alpha
	10
	11	pub fn initHSLA(h: f32, s: f32, l: f32, a: f32) Self {
	12	std.debug.assert(h >= 0.0 and h <= 1.0);
	13	std.debug.assert(s >= 0.0 and s <= 1.0);
	14	std.debug.assert(l >= 0.0 and l <= 1.0);
	15	std.debug.assert(a >= 0.0 and a <= 1.0);
	16	return Self{
	17	.h = h,
	18	.s = s,
	19	.l = l,
	20	.a = a,
	21	};
	22	}
	23
	24	pub fn eql(x: Self, y: Self) bool {
	25	return x.h == y.h and x.s == y.s and x.l == y.l and x.a == y.a;
	26	}

mod.zig+1

...	...	@@ -4,3 +4,4 @@ const color = @This();
4	4	pub const sRGB = @import("./sRGB.zig");
5	5	pub const LinearRgb = @import("./LinearRgb.zig");
6	6	pub const CMYK = @import("./CMYK.zig");
	7	pub const HSL = @import("./HSL.zig");

sRGB.zig+19

...	...	@@ -3,6 +3,7 @@
3	3	const std = @import("std");
4	4	const Self = @This();
5	5	const color = @import("./mod.zig");
	6	const _x = @import("./x.zig");
6	7
7	8	r: u8, // red value
8	9	g: u8, // green value
...	...	@@ -107,3 +108,21 @@ pub fn to_cmyk(x: Self) color.CMYK {
107	108	const a = f.a;
108	109	return color.CMYK.initCMYKA(c, m, y, k, a);
109	110	}
	111
	112	pub fn to_hsl(x: Self) color.HSL {
	113	const f = x.to_float();
	114	const cmax = @max(f.r, f.g, f.b);
	115	const cmin = @min(f.r, f.g, f.b);
	116	const delta = cmax - cmin;
	117	const h = blk: {
	118	if (delta == 0) break :blk 0;
	119	if (cmax == f.r) break :blk ((((f.g - f.b) / delta) % 6) * 60) % 360;
	120	if (cmax == f.g) break :blk ((((f.b - f.r) / delta) + 2) * 60) % 360;
	121	if (cmax == f.b) break :blk ((((f.r - f.g) / delta) + 4) * 60) % 360;
	122	unreachable;
	123	};
	124	const l = (cmax + cmin) / 2;
	125	const s = if (delta == 0) 0 else delta / (1 - _x.abs(2 * l - 1));
	126	const a = f.a;
	127	return color.HSL.initHSLA(h, s, l, a);
	128	}

x.zig created+3