import { mapper, mapTransferLinear } from './map.js';import converter from './converter.js';import prepare from './_prepare.js';import lerp from './util/lerp.js';import { getMode } from './modes.js';
const minzero = v => Math.max(v, 0);const clamp = v => Math.max(Math.min(v, 1), 0);
const matrixSepia = amount => { let a = 1 - clamp(amount); return [ 0.393 + 0.607 * a, 0.769 - 0.769 * a, 0.189 - 0.189 * a, 0, 0.349 - 0.349 * a, 0.686 + 0.314 * a, 0.168 - 0.168 * a, 0, 0.272 - 0.272 * a, 0.534 - 0.534 * a, 0.131 + 0.869 * a, 0, 0, 0, 0, 1 ];};
const matrixSaturate = sat => { let s = minzero(sat); return [ 0.213 + 0.787 * s, 0.715 - 0.715 * s, 0.072 - 0.072 * s, 0, 0.213 - 0.213 * s, 0.715 + 0.285 * s, 0.072 - 0.072 * s, 0, 0.213 - 0.213 * s, 0.715 - 0.715 * s, 0.072 + 0.928 * s, 0, 0, 0, 0, 1 ];};
const matrixGrayscale = amount => { let a = 1 - clamp(amount); return [ 0.2126 + 0.7874 * a, 0.7152 - 0.7152 * a, 0.0722 - 0.0722 * a, 0, 0.2126 - 0.2126 * a, 0.7152 + 0.2848 * a, 0.0722 - 0.0722 * a, 0, 0.2126 - 0.2126 * a, 0.7152 - 0.7152 * a, 0.0722 + 0.9278 * a, 0, 0, 0, 0, 1 ];};
const matrixHueRotate = degrees => { let rad = (Math.PI * degrees) / 180; let c = Math.cos(rad); let s = Math.sin(rad); return [ 0.213 + c * 0.787 - s * 0.213, 0.715 - c * 0.715 - s * 0.715, 0.072 - c * 0.072 + s * 0.928, 0, 0.213 - c * 0.213 + s * 0.143, 0.715 + c * 0.285 + s * 0.14, 0.072 - c * 0.072 - s * 0.283, 0, 0.213 - c * 0.213 - s * 0.787, 0.715 - c * 0.715 + s * 0.715, 0.072 + c * 0.928 + s * 0.072, 0, 0, 0, 0, 1 ];};
const matrix = (values, mode, preserve_mode = false) => { let conv = converter(mode); let channels = getMode(mode).channels; return color => { let c = conv(color); if (!c) { return undefined; } let res = { mode }; let ch; let count = channels.length; for (let i = 0; i < values.length; i++) { ch = channels[Math.floor(i / count)]; if (c[ch] === undefined) { continue; } res[ch] = (res[ch] || 0) + values[i] * (c[channels[i % count]] || 0); } if (!preserve_mode) { return res; } let prep = prepare(color); return prep && res.mode !== prep.mode ? converter(prep.mode)(res) : res; };};
const filterBrightness = (amt = 1, mode = 'rgb') => { let a = minzero(amt); return mapper(mapTransferLinear(a), mode, true);};
const filterContrast = (amt = 1, mode = 'rgb') => { let a = minzero(amt); return mapper(mapTransferLinear(a, (1 - a) / 2), mode, true);};const filterSepia = (amt = 1, mode = 'rgb') => matrix(matrixSepia(amt), mode, true);const filterSaturate = (amt = 1, mode = 'rgb') => matrix(matrixSaturate(amt), mode, true);const filterGrayscale = (amt = 1, mode = 'rgb') => matrix(matrixGrayscale(amt), mode, true);const filterInvert = (amt = 1, mode = 'rgb') => { let a = clamp(amt); return mapper( (v, ch) => (ch === 'alpha' ? v : lerp(a, 1 - a, v)), mode, true );};const filterHueRotate = (deg = 0, mode = 'rgb') => matrix(matrixHueRotate(deg), mode, true);
export { filterBrightness, filterContrast, filterSepia, filterSaturate, filterGrayscale, filterInvert, filterHueRotate};