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Edit File: map.js

import converter from './converter.js';
import prepare from './_prepare.js';
import { getMode } from './modes.js';

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
};

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