59c4041a49
This patch also changes most examples to use "top level await", since that's now supported and slightly simplifies the code.
73 lines
2.7 KiB
JavaScript
73 lines
2.7 KiB
JavaScript
/* Copyright 2014 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const PDF_PATH = "../../web/compressed.tracemonkey-pldi-09.pdf";
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const PAGE_NUMBER = 1;
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const PAGE_SCALE = 1.5;
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const SVG_NS = "http://www.w3.org/2000/svg";
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pdfjsLib.GlobalWorkerOptions.workerSrc =
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"../../node_modules/pdfjs-dist/build/pdf.worker.mjs";
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function buildSVG(viewport, textContent) {
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// Building SVG with size of the viewport (for simplicity)
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const svg = document.createElementNS(SVG_NS, "svg:svg");
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svg.setAttribute("width", viewport.width + "px");
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svg.setAttribute("height", viewport.height + "px");
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// items are transformed to have 1px font size
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svg.setAttribute("font-size", 1);
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// processing all items
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textContent.items.forEach(function (textItem) {
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// we have to take in account viewport transform, which includes scale,
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// rotation and Y-axis flip, and not forgetting to flip text.
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const tx = pdfjsLib.Util.transform(
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pdfjsLib.Util.transform(viewport.transform, textItem.transform),
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[1, 0, 0, -1, 0, 0]
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);
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const style = textContent.styles[textItem.fontName];
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// adding text element
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const text = document.createElementNS(SVG_NS, "svg:text");
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text.setAttribute("transform", "matrix(" + tx.join(" ") + ")");
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text.setAttribute("font-family", style.fontFamily);
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text.textContent = textItem.str;
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svg.append(text);
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});
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return svg;
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}
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async function pageLoaded() {
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// Loading document and page text content
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const loadingTask = pdfjsLib.getDocument({ url: PDF_PATH });
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const pdfDocument = await loadingTask.promise;
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const page = await pdfDocument.getPage(PAGE_NUMBER);
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const viewport = page.getViewport({ scale: PAGE_SCALE });
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const textContent = await page.getTextContent();
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// building SVG and adding that to the DOM
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const svg = buildSVG(viewport, textContent);
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document.getElementById("pageContainer").append(svg);
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// Release page resources.
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page.cleanup();
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}
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document.addEventListener("DOMContentLoaded", function () {
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if (typeof pdfjsLib === "undefined") {
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// eslint-disable-next-line no-alert
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alert("Please build the pdfjs-dist library using\n `gulp dist-install`");
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return;
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}
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pageLoaded();
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});
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