# modules/rgba_support.js

    /**
     * @license
     *
     * Copyright (c) 2021 Antti Palola, https://github.com/Pantura
     *
     * Permission is hereby granted, free of charge, to any person obtaining
     * a copy of this software and associated documentation files (the
     * "Software"), to deal in the Software without restriction, including
     * without limitation the rights to use, copy, modify, merge, publish,
     * distribute, sublicense, and/or sell copies of the Software, and to
     * permit persons to whom the Software is furnished to do so, subject to
     * the following conditions:
     *
     * The above copyright notice and this permission notice shall be
     * included in all copies or substantial portions of the Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     * ====================================================================
     */

    import { jsPDF } from "../jspdf.js";

    /**
     * jsPDF RGBA array PlugIn
     * @name rgba_support
     * @module
     */
    (function(jsPDFAPI) {
      "use strict";

      /**
       * @name processRGBA
       * @function
       *
       * Process RGBA Array. This is a one-dimension array with pixel data [red, green, blue, alpha, red, green, ...].
       * RGBA array data can be obtained from DOM canvas getImageData.
       * @ignore
       */
      jsPDFAPI.processRGBA = function(imageData, index, alias) {
        "use strict";

        var imagePixels = imageData.data;
        var length = imagePixels.length;
        // jsPDF takes alpha data separately so extract that.
        var rgbOut = new Uint8Array((length / 4) * 3);
        var alphaOut = new Uint8Array(length / 4);
        var outIndex = 0;
        var alphaIndex = 0;

        for (var i = 0; i < length; i += 4) {
          var r = imagePixels[i];
          var g = imagePixels[i + 1];
          var b = imagePixels[i + 2];
          var alpha = imagePixels[i + 3];
          rgbOut[outIndex++] = r;
          rgbOut[outIndex++] = g;
          rgbOut[outIndex++] = b;
          alphaOut[alphaIndex++] = alpha;
        }

        var rgbData = this.__addimage__.arrayBufferToBinaryString(rgbOut);
        var alphaData = this.__addimage__.arrayBufferToBinaryString(alphaOut);

        return {
          alpha: alphaData,
          data: rgbData,
          index: index,
          alias: alias,
          colorSpace: "DeviceRGB",
          bitsPerComponent: 8,
          width: imageData.width,
          height: imageData.height
        };
      };
    })(jsPDF.API);