126 lines
3.7 KiB
JavaScript
126 lines
3.7 KiB
JavaScript
/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- /
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/* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
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var pdfDocument, canvas, pageDisplay, pageNum;
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function load() {
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canvas = document.getElementById("canvas");
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canvas.mozOpaque = true;
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pageNum = parseInt(queryParams().page) || 1;
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fileName = queryParams().file || "compressed.tracemonkey-pldi-09.pdf";
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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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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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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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};
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req.send(null);
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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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function display() {
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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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var gfx = new CanvasGraphics(ctx);
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page.display(gfx);
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var t2 = Date.now();
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var infoDisplay = document.getElementById("info");
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infoDisplay.innerHTML = "Time to render: "+ (t1 - t0) + "/" + (t2 - t1) + " ms";
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}
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// Loading a font via data uri is asynchronous, so wait for all font
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// of the page to be fully loaded before loading the page
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var fontsReady = true;
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var fonts = page.fonts;
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for (var i = 0; i < fonts.length; i++) {
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var fontName = fonts[i].replace("+", "_");
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var font = Fonts[fontName];
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if (!font) {
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// load the new font
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var xref = page.xref;
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var resources = xref.fetchIfRef(page.resources);
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var fontResource = resources.get("Font");
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for (var id in fontResource.map) {
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var res = xref.fetch(fontResource.get(id));
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var descriptor = xref.fetch(res.get("FontDescriptor"));
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var name = descriptor.get("FontName").toString();
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if (name == fontName.replace("_", "+")) {
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var subtype = res.get("Subtype").name;
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var fontFile = page.xref.fetchIfRef(descriptor.get("FontFile"));
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if (!fontFile)
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fontFile = page.xref.fetchIfRef(descriptor.get("FontFile2"));
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new Font(fontName, fontFile, subtype);
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fontsReady = false;
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break;
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}
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}
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} else if (font.loading) {
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fontsReady = false;
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break;
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}
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}
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// If everything is ready do not delayed the page loading any more
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if (fontsReady)
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display();
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else
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setTimeout(displayPage, 150, num);
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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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