Jérome Maes
6a11f594a8
This huge library handle PDF file to display them, count their pages, ... Due to its size, the lib is declared in a separated optional bundle who should be called with a 't-call-assets' only on the page it is required.
376 lines
13 KiB
JavaScript
376 lines
13 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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/* Copyright 2012 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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/* globals PDFJS, shadow, isWorker, assert, warn, bytesToString, string32,
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globalScope, FontFace, Promise */
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'use strict';
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PDFJS.disableFontFace = false;
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var FontLoader = {
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insertRule: function fontLoaderInsertRule(rule) {
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var styleElement = document.getElementById('PDFJS_FONT_STYLE_TAG');
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if (!styleElement) {
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styleElement = document.createElement('style');
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styleElement.id = 'PDFJS_FONT_STYLE_TAG';
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document.documentElement.getElementsByTagName('head')[0].appendChild(
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styleElement);
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}
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var styleSheet = styleElement.sheet;
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styleSheet.insertRule(rule, styleSheet.cssRules.length);
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},
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clear: function fontLoaderClear() {
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var styleElement = document.getElementById('PDFJS_FONT_STYLE_TAG');
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if (styleElement) {
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styleElement.parentNode.removeChild(styleElement);
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}
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//#if !(MOZCENTRAL)
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this.nativeFontFaces.forEach(function(nativeFontFace) {
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document.fonts.delete(nativeFontFace);
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});
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this.nativeFontFaces.length = 0;
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//#endif
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},
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//#if !(MOZCENTRAL)
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get loadTestFont() {
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// This is a CFF font with 1 glyph for '.' that fills its entire width and
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// height.
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return shadow(this, 'loadTestFont', atob(
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'T1RUTwALAIAAAwAwQ0ZGIDHtZg4AAAOYAAAAgUZGVE1lkzZwAAAEHAAAABxHREVGABQAFQ' +
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'AABDgAAAAeT1MvMlYNYwkAAAEgAAAAYGNtYXABDQLUAAACNAAAAUJoZWFk/xVFDQAAALwA' +
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'AAA2aGhlYQdkA+oAAAD0AAAAJGhtdHgD6AAAAAAEWAAAAAZtYXhwAAJQAAAAARgAAAAGbm' +
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'FtZVjmdH4AAAGAAAAAsXBvc3T/hgAzAAADeAAAACAAAQAAAAEAALZRFsRfDzz1AAsD6AAA' +
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'AADOBOTLAAAAAM4KHDwAAAAAA+gDIQAAAAgAAgAAAAAAAAABAAADIQAAAFoD6AAAAAAD6A' +
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'ABAAAAAAAAAAAAAAAAAAAAAQAAUAAAAgAAAAQD6AH0AAUAAAKKArwAAACMAooCvAAAAeAA' +
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'MQECAAACAAYJAAAAAAAAAAAAAQAAAAAAAAAAAAAAAFBmRWQAwAAuAC4DIP84AFoDIQAAAA' +
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'AAAQAAAAAAAAAAACAAIAABAAAADgCuAAEAAAAAAAAAAQAAAAEAAAAAAAEAAQAAAAEAAAAA' +
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'AAIAAQAAAAEAAAAAAAMAAQAAAAEAAAAAAAQAAQAAAAEAAAAAAAUAAQAAAAEAAAAAAAYAAQ' +
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'AAAAMAAQQJAAAAAgABAAMAAQQJAAEAAgABAAMAAQQJAAIAAgABAAMAAQQJAAMAAgABAAMA' +
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'AQQJAAQAAgABAAMAAQQJAAUAAgABAAMAAQQJAAYAAgABWABYAAAAAAAAAwAAAAMAAAAcAA' +
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'EAAAAAADwAAwABAAAAHAAEACAAAAAEAAQAAQAAAC7//wAAAC7////TAAEAAAAAAAABBgAA' +
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'AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAA' +
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'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +
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'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +
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'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +
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'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMAAA' +
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'AAAAD/gwAyAAAAAQAAAAAAAAAAAAAAAAAAAAABAAQEAAEBAQJYAAEBASH4DwD4GwHEAvgc' +
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'A/gXBIwMAYuL+nz5tQXkD5j3CBLnEQACAQEBIVhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWF' +
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'hYWFhYWFhYAAABAQAADwACAQEEE/t3Dov6fAH6fAT+fPp8+nwHDosMCvm1Cvm1DAz6fBQA' +
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'AAAAAAABAAAAAMmJbzEAAAAAzgTjFQAAAADOBOQpAAEAAAAAAAAADAAUAAQAAAABAAAAAg' +
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'ABAAAAAAAAAAAD6AAAAAAAAA=='
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));
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},
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loadTestFontId: 0,
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loadingContext: {
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requests: [],
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nextRequestId: 0
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},
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isSyncFontLoadingSupported: (function detectSyncFontLoadingSupport() {
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if (isWorker) {
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return false;
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}
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// User agent string sniffing is bad, but there is no reliable way to tell
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// if font is fully loaded and ready to be used with canvas.
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var userAgent = window.navigator.userAgent;
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var m = /Mozilla\/5.0.*?rv:(\d+).*? Gecko/.exec(userAgent);
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if (m && m[1] >= 14) {
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return true;
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}
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// TODO other browsers
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if (userAgent === 'node') {
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return true;
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}
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return false;
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})(),
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nativeFontFaces: [],
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isFontLoadingAPISupported: !isWorker && !!document.fonts,
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addNativeFontFace: function fontLoader_addNativeFontFace(nativeFontFace) {
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this.nativeFontFaces.push(nativeFontFace);
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document.fonts.add(nativeFontFace);
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},
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bind: function fontLoaderBind(fonts, callback) {
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assert(!isWorker, 'bind() shall be called from main thread');
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var rules = [];
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var fontsToLoad = [];
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var fontLoadPromises = [];
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for (var i = 0, ii = fonts.length; i < ii; i++) {
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var font = fonts[i];
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// Add the font to the DOM only once or skip if the font
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// is already loaded.
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if (font.attached || font.loading === false) {
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continue;
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}
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font.attached = true;
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if (this.isFontLoadingAPISupported) {
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var nativeFontFace = font.createNativeFontFace();
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if (nativeFontFace) {
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fontLoadPromises.push(nativeFontFace.loaded);
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}
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} else {
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var rule = font.bindDOM();
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if (rule) {
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rules.push(rule);
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fontsToLoad.push(font);
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}
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}
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}
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var request = FontLoader.queueLoadingCallback(callback);
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if (this.isFontLoadingAPISupported) {
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Promise.all(fontsToLoad).then(function() {
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request.complete();
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});
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} else if (rules.length > 0 && !this.isSyncFontLoadingSupported) {
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FontLoader.prepareFontLoadEvent(rules, fontsToLoad, request);
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} else {
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request.complete();
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}
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},
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queueLoadingCallback: function FontLoader_queueLoadingCallback(callback) {
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function LoadLoader_completeRequest() {
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assert(!request.end, 'completeRequest() cannot be called twice');
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request.end = Date.now();
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// sending all completed requests in order how they were queued
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while (context.requests.length > 0 && context.requests[0].end) {
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var otherRequest = context.requests.shift();
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setTimeout(otherRequest.callback, 0);
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}
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}
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var context = FontLoader.loadingContext;
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var requestId = 'pdfjs-font-loading-' + (context.nextRequestId++);
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var request = {
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id: requestId,
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complete: LoadLoader_completeRequest,
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callback: callback,
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started: Date.now()
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};
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context.requests.push(request);
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return request;
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},
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prepareFontLoadEvent: function fontLoaderPrepareFontLoadEvent(rules,
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fonts,
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request) {
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/** Hack begin */
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// There's currently no event when a font has finished downloading so the
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// following code is a dirty hack to 'guess' when a font is
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// ready. It's assumed fonts are loaded in order, so add a known test
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// font after the desired fonts and then test for the loading of that
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// test font.
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function int32(data, offset) {
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return (data.charCodeAt(offset) << 24) |
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(data.charCodeAt(offset + 1) << 16) |
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(data.charCodeAt(offset + 2) << 8) |
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(data.charCodeAt(offset + 3) & 0xff);
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}
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function spliceString(s, offset, remove, insert) {
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var chunk1 = s.substr(0, offset);
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var chunk2 = s.substr(offset + remove);
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return chunk1 + insert + chunk2;
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}
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var i, ii;
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var canvas = document.createElement('canvas');
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canvas.width = 1;
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canvas.height = 1;
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var ctx = canvas.getContext('2d');
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var called = 0;
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function isFontReady(name, callback) {
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called++;
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// With setTimeout clamping this gives the font ~100ms to load.
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if(called > 30) {
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warn('Load test font never loaded.');
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callback();
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return;
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}
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ctx.font = '30px ' + name;
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ctx.fillText('.', 0, 20);
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var imageData = ctx.getImageData(0, 0, 1, 1);
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if (imageData.data[3] > 0) {
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callback();
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return;
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}
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setTimeout(isFontReady.bind(null, name, callback));
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}
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var loadTestFontId = 'lt' + Date.now() + this.loadTestFontId++;
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// Chromium seems to cache fonts based on a hash of the actual font data,
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// so the font must be modified for each load test else it will appear to
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// be loaded already.
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// TODO: This could maybe be made faster by avoiding the btoa of the full
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// font by splitting it in chunks before hand and padding the font id.
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var data = this.loadTestFont;
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var COMMENT_OFFSET = 976; // has to be on 4 byte boundary (for checksum)
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data = spliceString(data, COMMENT_OFFSET, loadTestFontId.length,
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loadTestFontId);
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// CFF checksum is important for IE, adjusting it
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var CFF_CHECKSUM_OFFSET = 16;
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var XXXX_VALUE = 0x58585858; // the "comment" filled with 'X'
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var checksum = int32(data, CFF_CHECKSUM_OFFSET);
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for (i = 0, ii = loadTestFontId.length - 3; i < ii; i += 4) {
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checksum = (checksum - XXXX_VALUE + int32(loadTestFontId, i)) | 0;
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}
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if (i < loadTestFontId.length) { // align to 4 bytes boundary
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checksum = (checksum - XXXX_VALUE +
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int32(loadTestFontId + 'XXX', i)) | 0;
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}
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data = spliceString(data, CFF_CHECKSUM_OFFSET, 4, string32(checksum));
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var url = 'url(data:font/opentype;base64,' + btoa(data) + ');';
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var rule = '@font-face { font-family:"' + loadTestFontId + '";src:' +
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url + '}';
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FontLoader.insertRule(rule);
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var names = [];
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for (i = 0, ii = fonts.length; i < ii; i++) {
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names.push(fonts[i].loadedName);
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}
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names.push(loadTestFontId);
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var div = document.createElement('div');
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div.setAttribute('style',
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'visibility: hidden;' +
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'width: 10px; height: 10px;' +
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'position: absolute; top: 0px; left: 0px;');
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for (i = 0, ii = names.length; i < ii; ++i) {
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var span = document.createElement('span');
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span.textContent = 'Hi';
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span.style.fontFamily = names[i];
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div.appendChild(span);
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}
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document.body.appendChild(div);
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isFontReady(loadTestFontId, function() {
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document.body.removeChild(div);
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request.complete();
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});
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/** Hack end */
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}
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//#else
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//bind: function fontLoaderBind(fonts, callback) {
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// assert(!isWorker, 'bind() shall be called from main thread');
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//
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// for (var i = 0, ii = fonts.length; i < ii; i++) {
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// var font = fonts[i];
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// if (font.attached) {
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// continue;
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// }
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//
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// font.attached = true;
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// font.bindDOM()
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// }
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//
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// setTimeout(callback);
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//}
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//#endif
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};
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var FontFaceObject = (function FontFaceObjectClosure() {
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function FontFaceObject(name, file, properties) {
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this.compiledGlyphs = {};
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if (arguments.length === 1) {
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// importing translated data
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var data = arguments[0];
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for (var i in data) {
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this[i] = data[i];
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}
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return;
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}
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}
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FontFaceObject.prototype = {
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//#if !(MOZCENTRAL)
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createNativeFontFace: function FontFaceObject_createNativeFontFace() {
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if (!this.data) {
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return null;
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}
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if (PDFJS.disableFontFace) {
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this.disableFontFace = true;
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return null;
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}
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var nativeFontFace = new FontFace(this.loadedName, this.data, {});
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FontLoader.addNativeFontFace(nativeFontFace);
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if (PDFJS.pdfBug && 'FontInspector' in globalScope &&
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globalScope['FontInspector'].enabled) {
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globalScope['FontInspector'].fontAdded(this);
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}
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return nativeFontFace;
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},
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//#endif
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bindDOM: function FontFaceObject_bindDOM() {
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if (!this.data) {
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return null;
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}
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if (PDFJS.disableFontFace) {
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this.disableFontFace = true;
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return null;
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}
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var data = bytesToString(new Uint8Array(this.data));
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var fontName = this.loadedName;
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// Add the font-face rule to the document
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var url = ('url(data:' + this.mimetype + ';base64,' +
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window.btoa(data) + ');');
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var rule = '@font-face { font-family:"' + fontName + '";src:' + url + '}';
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FontLoader.insertRule(rule);
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if (PDFJS.pdfBug && 'FontInspector' in globalScope &&
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globalScope['FontInspector'].enabled) {
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globalScope['FontInspector'].fontAdded(this, url);
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}
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return rule;
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},
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getPathGenerator: function FontLoader_getPathGenerator(objs, character) {
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if (!(character in this.compiledGlyphs)) {
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var js = objs.get(this.loadedName + '_path_' + character);
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/*jshint -W054 */
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this.compiledGlyphs[character] = new Function('c', 'size', js);
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}
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return this.compiledGlyphs[character];
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}
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};
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return FontFaceObject;
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})();
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