modules/rgba_support.js

  1. /**
  2.  * @license
  3.  *
  4.  * Copyright (c) 2021 Antti Palola, https://github.com/Pantura
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining
  7.  * a copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sublicense, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice shall be
  15.  * included in all copies or substantial portions of the Software.
  16.  *
  17.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18.  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20.  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  21.  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22.  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23.  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24.  * ====================================================================
  25.  */
  27. import { jsPDF } from "../jspdf.js";
  29. /**
  30.  * jsPDF RGBA array PlugIn
  31.  * @name rgba_support
  32.  * @module
  33.  */
  34. (function(jsPDFAPI) {
  35.   "use strict";
  37.   /**
  38.    * @name processRGBA
  39.    * @function
  40.    *
  41.    * Process RGBA Array. This is a one-dimension array with pixel data [red, green, blue, alpha, red, green, ...].
  42.    * RGBA array data can be obtained from DOM canvas getImageData.
  43.    * @ignore
  44.    */
  45.   jsPDFAPI.processRGBA = function(imageData, index, alias) {
  46.     "use strict";
  48.     var imagePixels = imageData.data;
  49.     var length = imagePixels.length;
  50.     // jsPDF takes alpha data separately so extract that.
  51.     var rgbOut = new Uint8Array((length / 4) * 3);
  52.     var alphaOut = new Uint8Array(length / 4);
  53.     var outIndex = 0;
  54.     var alphaIndex = 0;
  56.     for (var i = 0; i < length; i += 4) {
  57.       var r = imagePixels[i];
  58.       var g = imagePixels[i + 1];
  59.       var b = imagePixels[i + 2];
  60.       var alpha = imagePixels[i + 3];
  61.       rgbOut[outIndex++] = r;
  62.       rgbOut[outIndex++] = g;
  63.       rgbOut[outIndex++] = b;
  64.       alphaOut[alphaIndex++] = alpha;
  65.     }
  67.     var rgbData = this.__addimage__.arrayBufferToBinaryString(rgbOut);
  68.     var alphaData = this.__addimage__.arrayBufferToBinaryString(alphaOut);
  70.     return {
  71.       alpha: alphaData,
  72.       data: rgbData,
  73.       index: index,
  74.       alias: alias,
  75.       colorSpace: "DeviceRGB",
  76.       bitsPerComponent: 8,
  77.       width: imageData.width,
  78.       height: imageData.height
  79.     };
  80.   };
  81. })(jsPDF.API);