import converter from './converter.js';import prepare from './_prepare.js';import { getMode } from './modes.js';
const mapper = (fn, mode = 'rgb', preserve_mode = false) => { let channels = mode ? getMode(mode).channels : null; let conv = mode ? converter(mode) : prepare; return color => { let conv_color = conv(color); let res = (channels || getMode(color.mode).channels).reduce( (res, ch) => { let v = fn(conv_color[ch], ch, conv_color, mode); if (v !== undefined && !isNaN(v)) { res[ch] = v; } return res; }, { mode } ); if (!preserve_mode) { return res; } let prep = prepare(color); if (prep && prep.mode !== res.mode) { return converter(prep.mode)(res); } return res; };};
const mapAlphaMultiply = (v, ch, c) => { if (ch !== 'alpha') { return (v || 0) * (c.alpha !== undefined ? c.alpha : 1); } return v;};
const mapAlphaDivide = (v, ch, c) => { if (ch !== 'alpha' && c.alpha !== 0) { return (v || 0) / (c.alpha !== undefined ? c.alpha : 1); } return v;};
const mapTransferLinear = (slope = 1, intercept = 0) => (v, ch) => { if (ch !== 'alpha') { return v * slope + intercept; } return v; };
const mapTransferGamma = (amplitude = 1, exponent = 1, offset = 0) => (v, ch) => { if (ch !== 'alpha') { return amplitude * Math.pow(v, exponent) + offset; } return v; };
export { mapper, mapAlphaMultiply, mapAlphaDivide, mapTransferLinear, mapTransferGamma};