pdf-transform/pdfjs-dist/lib/test/unit/custom_spec.js

Transforms PDF to png or html files

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2020 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";

var _test_utils = require("./test_utils.js");

var _display_utils = require("../../display/display_utils.js");

var _api = require("../../display/api.js");

var _is_node = require("../../shared/is_node.js");

function getTopLeftPixel(canvasContext) {
  const imgData = canvasContext.getImageData(0, 0, 1, 1);
  return {
    r: imgData.data[0],
    g: imgData.data[1],
    b: imgData.data[2],
    a: imgData.data[3]
  };
}

describe("custom canvas rendering", function () {
  const transparentGetDocumentParams = (0, _test_utils.buildGetDocumentParams)("transparent.pdf");
  let CanvasFactory;
  let loadingTask;
  let page;
  beforeAll(function (done) {
    if (_is_node.isNodeJS) {
      CanvasFactory = new _test_utils.NodeCanvasFactory();
    } else {
      CanvasFactory = new _display_utils.DOMCanvasFactory();
    }

    loadingTask = (0, _api.getDocument)(transparentGetDocumentParams);
    loadingTask.promise.then(function (doc) {
      return doc.getPage(1);
    }).then(function (data) {
      page = data;
      done();
    }).catch(done.fail);
  });
  afterAll(function (done) {
    CanvasFactory = null;
    page = null;
    loadingTask.destroy().then(done);
  });
  it("renders to canvas with a default white background", function (done) {
    var viewport = page.getViewport({
      scale: 1
    });
    var canvasAndCtx = CanvasFactory.create(viewport.width, viewport.height);
    const renderTask = page.render({
      canvasContext: canvasAndCtx.context,
      viewport
    });
    renderTask.promise.then(function () {
      expect(getTopLeftPixel(canvasAndCtx.context)).toEqual({
        r: 255,
        g: 255,
        b: 255,
        a: 255
      });
      CanvasFactory.destroy(canvasAndCtx);
      done();
    }).catch(done.fail);
  });
  it("renders to canvas with a custom background", function (done) {
    var viewport = page.getViewport({
      scale: 1
    });
    var canvasAndCtx = CanvasFactory.create(viewport.width, viewport.height);
    const renderTask = page.render({
      canvasContext: canvasAndCtx.context,
      viewport,
      background: "rgba(255,0,0,1.0)"
    });
    renderTask.promise.then(function () {
      expect(getTopLeftPixel(canvasAndCtx.context)).toEqual({
        r: 255,
        g: 0,
        b: 0,
        a: 255
      });
      CanvasFactory.destroy(canvasAndCtx);
      done();
    }).catch(done.fail);
  });
});