pdfjs-dist/lib/shared/scripting_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.ColorConverters = void 0;

function makeColorComp(n) {
  return Math.floor(Math.max(0, Math.min(1, n)) * 255).toString(16).padStart(2, "0");
}

class ColorConverters {
  static CMYK_G([c, y, m, k]) {
    return ["G", 1 - Math.min(1, 0.3 * c + 0.59 * m + 0.11 * y + k)];
  }

  static G_CMYK([g]) {
    return ["CMYK", 0, 0, 0, 1 - g];
  }

  static G_RGB([g]) {
    return ["RGB", g, g, g];
  }

  static G_HTML([g]) {
    const G = makeColorComp(g);
    return `#${G}${G}${G}`;
  }

  static RGB_G([r, g, b]) {
    return ["G", 0.3 * r + 0.59 * g + 0.11 * b];
  }

  static RGB_HTML([r, g, b]) {
    const R = makeColorComp(r);
    const G = makeColorComp(g);
    const B = makeColorComp(b);
    return `#${R}${G}${B}`;
  }

  static T_HTML() {
    return "#00000000";
  }

  static CMYK_RGB([c, y, m, k]) {
    return ["RGB", 1 - Math.min(1, c + k), 1 - Math.min(1, m + k), 1 - Math.min(1, y + k)];
  }

  static CMYK_HTML(components) {
    const rgb = this.CMYK_RGB(components).slice(1);
    return this.RGB_HTML(rgb);
  }

  static RGB_CMYK([r, g, b]) {
    const c = 1 - r;
    const m = 1 - g;
    const y = 1 - b;
    const k = Math.min(c, m, y);
    return ["CMYK", c, m, y, k];
  }

}

exports.ColorConverters = ColorConverters;