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@use 'sass:color';
@use 'sass:math';
@use 'sass:map';
@use 'sass:list';
@use 'sass:meta';
@use 'iro-sass/src/iro-sass' as iro;
@use 'iro-sass/src/easing';
@use 'apca';
@use 'themes';
@function palette($base-color, $contrasts, $chroma-range: 1, $ref-color: $base-color) {
$base-lch: color.to-space($base-color, oklch);
$ref-lch: color.to-space($ref-color, oklch);
$ref-l: color.channel($ref-lch, 'lightness');
$ref-y: apca.sRGB_to_Y($ref-lch);
$cmax: math.max(map.values($contrasts)...);
$cmax: math.max($cmax, math.abs(math.min(map.values($contrasts)...)));
$black-y: apca.sRGB_to_Y(#000);
$white-y: apca.sRGB_to_Y(#fff);
$chroma-inv: false;
@if $chroma-range < 0 {
$chroma-inv: true;
$chroma-range: -1 * $chroma-range;
}
$chroma-easing: meta.get-function(themes.$palette-chroma-easing, $module: easing);
$palette: ();
@each $key, $contrast in $contrasts {
$y: apca.reverse($contrast, $ref-y);
$l: color.channel($base-lch, 'lightness');
$c: 1;
@if $y != false {
$l: color.channel(apca.Y_to_sRGB($y), 'lightness', oklch);
} @else {
$y: $ref-y;
}
@if $chroma-range != 1 {
$c: if($ref-l > 50%, math.clamp(0, math.div($contrast, $cmax), 1), -1 * math.clamp(-1, math.div($contrast, $cmax), 0));
@if $chroma-inv {
$c: 1 - $c;
}
$c: meta.call($chroma-easing, $c);
$c: $chroma-range + (1 - $chroma-range) * $c;
}
$color: oklch($l ($c * color.channel($base-lch, 'chroma')) color.channel($base-lch, 'hue'));
$contrast-black: apca.contrast($black-y, $y);
$contrast-white: apca.contrast($white-y, $y);
$palette: map.set($palette, $key, $color);
$palette: map.set($palette, #{$key}-text, if(math.abs($contrast-black) > math.abs($contrast-white), #000, #fff));
}
@return $palette;
}
@function transparent-palette($color, $text, $alphas) {
$palette: (
--text: $text,
);
@each $key, $alpha in $alphas {
$palette: map.set($palette, $key, rgba($color, $alpha));
}
@return $palette;
}
@function px-to-em($size, $base: iro.$vars-root-size) {
@return math.div($size, $base) * 1em;
}
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