111 lines
3.0 KiB
JavaScript
111 lines
3.0 KiB
JavaScript
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
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'use strict';
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var pdfDocument, canvas, pageScale, pageDisplay, pageNum, numPages;
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function load(userInput) {
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canvas = document.getElementById('canvas');
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canvas.mozOpaque = true;
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pageNum = ('page' in queryParams()) ? parseInt(queryParams().page) : 1;
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pageScale = ('scale' in queryParams()) ? parseInt(queryParams().scale) : 1.5;
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var fileName = userInput;
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if (!userInput) {
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fileName = queryParams().file || 'compressed.tracemonkey-pldi-09.pdf';
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}
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open(fileName);
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}
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function queryParams() {
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var qs = window.location.search.substring(1);
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var kvs = qs.split('&');
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var params = { };
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for (var i = 0; i < kvs.length; ++i) {
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var kv = kvs[i].split('=');
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params[unescape(kv[0])] = unescape(kv[1]);
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}
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return params;
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}
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function open(url) {
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document.title = url;
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if (url.indexOf("http") == 0)
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return;
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var req = new XMLHttpRequest();
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req.open('GET', url);
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req.mozResponseType = req.responseType = 'arraybuffer';
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req.expected = (document.URL.indexOf('file:') == 0) ? 0 : 200;
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req.onreadystatechange = function() {
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if (req.readyState == 4 && req.status == req.expected) {
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var data = (req.mozResponseArrayBuffer || req.mozResponse ||
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req.responseArrayBuffer || req.response);
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loadDocument(data);
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}
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};
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req.send(null);
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}
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window.addEventListener("pdfloaded", function(aEvent) {
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loadDocument(aEvent.detail);
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}, true);
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function loadDocument(data) {
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pdfDocument = new PDFDoc(new Stream(data));
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numPages = pdfDocument.numPages;
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document.getElementById('numPages').innerHTML = numPages.toString();
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goToPage(pageNum);
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}
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function gotoPage(num) {
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if (0 <= num && num <= numPages)
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pageNum = num;
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displayPage(pageNum);
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}
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function displayPage(num) {
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document.getElementById('pageNumber').value = num;
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var t0 = Date.now();
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var page = pdfDocument.getPage(pageNum = num);
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var pdfToCssUnitsCoef = 96.0 / 72.0;
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var pageWidth = (page.mediaBox[2] - page.mediaBox[0]);
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var pageHeight = (page.mediaBox[3] - page.mediaBox[1]);
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canvas.width = pageScale * pageWidth * pdfToCssUnitsCoef;
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canvas.height = pageScale * pageHeight * pdfToCssUnitsCoef;
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var t1 = Date.now();
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var ctx = canvas.getContext('2d');
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ctx.save();
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ctx.fillStyle = 'rgb(255, 255, 255)';
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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ctx.restore();
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page.startRendering(
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ctx,
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function() {
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var infoDisplay = document.getElementById('info');
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var stats = page.stats;
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var t2 = stats.compile, t3 = stats.fonts, t4 = stats.render;
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infoDisplay.innerHTML = 'Time to load/compile/fonts/render: ' +
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(t1 - t0) + '/' + (t2 - t1) + '/' + (t3 - t2) + '/' + (t4 - t3) + ' ms';
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});
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}
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function nextPage() {
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if (pageNum < pdfDocument.numPages)
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displayPage(++pageNum);
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}
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function prevPage() {
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if (pageNum > 1)
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displayPage(--pageNum);
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}
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function goToPage(num) {
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if (0 <= num && num <= numPages)
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displayPage(pageNum = num);
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}
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