image_utils.js

/**
 * @licstart The following is the entire license notice for the
 * JavaScript code in this page
 *
 * Copyright 2022 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @licend The above is the entire license notice for the
 * JavaScript code in this page
 */
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.applyMaskImageData = applyMaskImageData;

var _util = require("./util.js");

function applyMaskImageData({
  src,
  srcPos = 0,
  dest,
  destPos = 0,
  width,
  height,
  inverseDecode = false
}) {
  const opaque = _util.FeatureTest.isLittleEndian ? 0xff000000 : 0x000000ff;
  const [zeroMapping, oneMapping] = !inverseDecode ? [opaque, 0] : [0, opaque];
  const widthInSource = width >> 3;
  const widthRemainder = width & 7;
  const srcLength = src.length;
  dest = new Uint32Array(dest.buffer);

  for (let i = 0; i < height; i++) {
    for (const max = srcPos + widthInSource; srcPos < max; srcPos++) {
      const elem = srcPos < srcLength ? src[srcPos] : 255;
      dest[destPos++] = elem & 0b10000000 ? oneMapping : zeroMapping;
      dest[destPos++] = elem & 0b1000000 ? oneMapping : zeroMapping;
      dest[destPos++] = elem & 0b100000 ? oneMapping : zeroMapping;
      dest[destPos++] = elem & 0b10000 ? oneMapping : zeroMapping;
      dest[destPos++] = elem & 0b1000 ? oneMapping : zeroMapping;
      dest[destPos++] = elem & 0b100 ? oneMapping : zeroMapping;
      dest[destPos++] = elem & 0b10 ? oneMapping : zeroMapping;
      dest[destPos++] = elem & 0b1 ? oneMapping : zeroMapping;
    }

    if (widthRemainder === 0) {
      continue;
    }

    const elem = srcPos < srcLength ? src[srcPos++] : 255;

    for (let j = 0; j < widthRemainder; j++) {
      dest[destPos++] = elem & 1 << 7 - j ? oneMapping : zeroMapping;
    }
  }

  return {
    srcPos,
    destPos
  };
}