image-js/lib/image/internal/copyAlphaChannel.js

Image processing and manipulation in JavaScript

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = copyAlphaChannel;
/**
 * Copies the alpha channel from an image to another. no-op if one of the images has no alpha
 * @private
 * @param {Image} from
 * @param {Image} to
 */
function copyAlphaChannel(from, to) {
  if (from.alpha === 1 && to.alpha === 1) {
    for (let i = 0; i < from.size; i++) {
      to.data[i * to.channels + to.components] = from.data[i * from.channels + from.components];
    }
  }
}