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1962 lines
68 KiB
1962 lines
68 KiB
/* -*- 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 isWorker = (typeof window == 'undefined'); |
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|
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/** |
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* Maximum file size of the font. |
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*/ |
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var kMaxFontFileSize = 200000; |
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|
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/** |
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* Maximum time to wait for a font to be loaded by font-face rules. |
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*/ |
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var kMaxWaitForFontFace = 1000; |
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|
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/** |
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* Hold a map of decoded fonts and of the standard fourteen Type1 fonts and |
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* their acronyms. |
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* TODO Add the standard fourteen Type1 fonts list by default |
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* http://cgit.freedesktop.org/poppler/poppler/tree/poppler/GfxFont.cc#n65 |
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*/ |
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|
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var FontMeasure = (function FontMeasure() { |
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var kScalePrecision = 40; |
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var ctx = document.createElement('canvas').getContext('2d'); |
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ctx.scale(1 / kScalePrecision, 1); |
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var current; |
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var measureCache; |
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|
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return { |
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setActive: function fonts_setActive(font, size) { |
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if (current = font) { |
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var sizes = current.sizes; |
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if (!(measureCache = sizes[size])) |
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measureCache = sizes[size] = Object.create(null); |
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} else { |
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measureCache = null |
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} |
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|
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ctx.font = (size * kScalePrecision) + 'px "' + font.loadedName + '"'; |
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}, |
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measureText: function fonts_measureText(text) { |
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var width; |
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if (measureCache && (width = measureCache[text])) |
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return width; |
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width = ctx.measureText(text).width / kScalePrecision; |
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if (measureCache) |
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measureCache[text] = width; |
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return width; |
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} |
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}; |
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})(); |
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var FontLoader = { |
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listeningForFontLoad: false, |
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bind: function(fonts, callback) { |
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function checkFontsLoaded() { |
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for (var i = 0; i < objs.length; i++) { |
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var fontObj = objs[i]; |
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if (fontObj.loading) { |
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return false; |
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} |
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} |
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document.documentElement.removeEventListener( |
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'pdfjsFontLoad', checkFontsLoaded, false); |
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callback(); |
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return true; |
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} |
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|
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var rules = [], names = [], objs = []; |
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for (var i = 0; i < fonts.length; i++) { |
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var font = fonts[i]; |
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var obj = new Font(font.name, font.file, font.properties); |
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obj.loading = true; |
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objs.push(obj); |
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var str = ''; |
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var data = obj.data; |
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var length = data.length; |
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for (var j = 0; j < length; j++) |
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str += String.fromCharCode(data[j]); |
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|
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var rule = isWorker ? obj.bindWorker(str) : obj.bindDOM(str); |
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if (rule) { |
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rules.push(rule); |
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names.push(obj.loadedName); |
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} |
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} |
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this.listeningForFontLoad = false; |
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if (!isWorker && rules.length) { |
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FontLoader.prepareFontLoadEvent(rules, names, objs); |
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} |
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|
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if (!checkFontsLoaded()) { |
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document.documentElement.addEventListener( |
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'pdfjsFontLoad', checkFontsLoaded, false); |
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} |
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|
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return objs; |
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}, |
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// Set things up so that at least one pdfjsFontLoad event is |
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// dispatched when all the @font-face |rules| for |names| have been |
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// loaded in a subdocument. It's expected that the load of |rules| |
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// has already started in this (outer) document, so that they should |
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// be ordered before the load in the subdocument. |
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prepareFontLoadEvent: function(rules, names, objs) { |
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/** Hack begin */ |
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// There's 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. This code will be obsoleted by Mozilla bug 471915. |
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// |
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// The only reliable way to know if a font is loaded in Gecko |
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// (at the moment) is document.onload in a document with |
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// a @font-face rule defined in a "static" stylesheet. We use a |
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// subdocument in an <iframe>, set up properly, to know when |
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// our @font-face rule was loaded. However, the subdocument and |
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// outer document can't share CSS rules, so the inner document |
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// is only part of the puzzle. The second piece is an invisible |
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// div created in order to force loading of the @font-face in |
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// the *outer* document. (The font still needs to be loaded for |
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// its metrics, for reflow). We create the div first for the |
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// outer document, then create the iframe. Unless something |
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// goes really wonkily, we expect the @font-face for the outer |
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// document to be processed before the inner. That's still |
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// fragile, but seems to work in practice. |
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// |
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// The postMessage() hackery was added to work around chrome bug |
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// 82402. |
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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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var html = ''; |
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for (var i = 0; i < names.length; ++i) { |
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html += '<span style="font-family:' + names[i] + '">Hi</span>'; |
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} |
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div.innerHTML = html; |
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document.body.appendChild(div); |
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if (!this.listeningForFontLoad) { |
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window.addEventListener( |
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'message', |
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function(e) { |
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var fontNames = JSON.parse(e.data); |
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for (var i = 0; i < objs.length; ++i) { |
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var font = objs[i]; |
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font.loading = false; |
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} |
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var evt = document.createEvent('Events'); |
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evt.initEvent('pdfjsFontLoad', true, false); |
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document.documentElement.dispatchEvent(evt); |
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}, |
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false); |
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this.listeningForFontLoad = true; |
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} |
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// XXX we should have a time-out here too, and maybe fire |
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// pdfjsFontLoadFailed? |
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var src = '<!DOCTYPE HTML><html><head>'; |
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src += '<style type="text/css">'; |
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for (var i = 0; i < rules.length; ++i) { |
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src += rules[i]; |
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} |
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src += '</style>'; |
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src += '<script type="application/javascript">'; |
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var fontNamesArray = ''; |
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for (var i = 0; i < names.length; ++i) { |
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fontNamesArray += '"' + names[i] + '", '; |
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} |
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src += ' var fontNames=[' + fontNamesArray + '];\n'; |
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src += ' window.onload = function () {\n'; |
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src += ' top.postMessage(JSON.stringify(fontNames), "*");\n'; |
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src += ' }'; |
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src += '</script></head><body>'; |
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for (var i = 0; i < names.length; ++i) { |
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src += '<p style="font-family:\'' + names[i] + '\'">Hi</p>'; |
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} |
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src += '</body></html>'; |
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var frame = document.createElement('iframe'); |
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frame.src = 'data:text/html,' + src; |
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frame.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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document.body.appendChild(frame); |
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/** Hack end */ |
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} |
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}; |
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var UnicodeRanges = [ |
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{ 'begin': 0x0000, 'end': 0x007F }, // Basic Latin |
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{ 'begin': 0x0080, 'end': 0x00FF }, // Latin-1 Supplement |
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{ 'begin': 0x0100, 'end': 0x017F }, // Latin Extended-A |
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{ 'begin': 0x0180, 'end': 0x024F }, // Latin Extended-B |
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{ 'begin': 0x0250, 'end': 0x02AF }, // IPA Extensions |
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{ 'begin': 0x02B0, 'end': 0x02FF }, // Spacing Modifier Letters |
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{ 'begin': 0x0300, 'end': 0x036F }, // Combining Diacritical Marks |
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{ 'begin': 0x0370, 'end': 0x03FF }, // Greek and Coptic |
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{ 'begin': 0x2C80, 'end': 0x2CFF }, // Coptic |
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{ 'begin': 0x0400, 'end': 0x04FF }, // Cyrillic |
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{ 'begin': 0x0530, 'end': 0x058F }, // Armenian |
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{ 'begin': 0x0590, 'end': 0x05FF }, // Hebrew |
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{ 'begin': 0xA500, 'end': 0xA63F }, // Vai |
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{ 'begin': 0x0600, 'end': 0x06FF }, // Arabic |
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{ 'begin': 0x07C0, 'end': 0x07FF }, // NKo |
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{ 'begin': 0x0900, 'end': 0x097F }, // Devanagari |
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{ 'begin': 0x0980, 'end': 0x09FF }, // Bengali |
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{ 'begin': 0x0A00, 'end': 0x0A7F }, // Gurmukhi |
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{ 'begin': 0x0A80, 'end': 0x0AFF }, // Gujarati |
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{ 'begin': 0x0B00, 'end': 0x0B7F }, // Oriya |
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{ 'begin': 0x0B80, 'end': 0x0BFF }, // Tamil |
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{ 'begin': 0x0C00, 'end': 0x0C7F }, // Telugu |
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{ 'begin': 0x0C80, 'end': 0x0CFF }, // Kannada |
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{ 'begin': 0x0D00, 'end': 0x0D7F }, // Malayalam |
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{ 'begin': 0x0E00, 'end': 0x0E7F }, // Thai |
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{ 'begin': 0x0E80, 'end': 0x0EFF }, // Lao |
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{ 'begin': 0x10A0, 'end': 0x10FF }, // Georgian |
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{ 'begin': 0x1B00, 'end': 0x1B7F }, // Balinese |
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{ 'begin': 0x1100, 'end': 0x11FF }, // Hangul Jamo |
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{ 'begin': 0x1E00, 'end': 0x1EFF }, // Latin Extended Additional |
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{ 'begin': 0x1F00, 'end': 0x1FFF }, // Greek Extended |
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{ 'begin': 0x2000, 'end': 0x206F }, // General Punctuation |
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{ 'begin': 0x2070, 'end': 0x209F }, // Superscripts And Subscripts |
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{ 'begin': 0x20A0, 'end': 0x20CF }, // Currency Symbol |
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{ 'begin': 0x20D0, 'end': 0x20FF }, // Combining Diacritical Marks For Symbols |
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{ 'begin': 0x2100, 'end': 0x214F }, // Letterlike Symbols |
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{ 'begin': 0x2150, 'end': 0x218F }, // Number Forms |
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{ 'begin': 0x2190, 'end': 0x21FF }, // Arrows |
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{ 'begin': 0x2200, 'end': 0x22FF }, // Mathematical Operators |
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{ 'begin': 0x2300, 'end': 0x23FF }, // Miscellaneous Technical |
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{ 'begin': 0x2400, 'end': 0x243F }, // Control Pictures |
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{ 'begin': 0x2440, 'end': 0x245F }, // Optical Character Recognition |
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{ 'begin': 0x2460, 'end': 0x24FF }, // Enclosed Alphanumerics |
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{ 'begin': 0x2500, 'end': 0x257F }, // Box Drawing |
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{ 'begin': 0x2580, 'end': 0x259F }, // Block Elements |
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{ 'begin': 0x25A0, 'end': 0x25FF }, // Geometric Shapes |
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{ 'begin': 0x2600, 'end': 0x26FF }, // Miscellaneous Symbols |
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{ 'begin': 0x2700, 'end': 0x27BF }, // Dingbats |
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{ 'begin': 0x3000, 'end': 0x303F }, // CJK Symbols And Punctuation |
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{ 'begin': 0x3040, 'end': 0x309F }, // Hiragana |
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{ 'begin': 0x30A0, 'end': 0x30FF }, // Katakana |
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{ 'begin': 0x3100, 'end': 0x312F }, // Bopomofo |
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{ 'begin': 0x3130, 'end': 0x318F }, // Hangul Compatibility Jamo |
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{ 'begin': 0xA840, 'end': 0xA87F }, // Phags-pa |
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{ 'begin': 0x3200, 'end': 0x32FF }, // Enclosed CJK Letters And Months |
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{ 'begin': 0x3300, 'end': 0x33FF }, // CJK Compatibility |
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{ 'begin': 0xAC00, 'end': 0xD7AF }, // Hangul Syllables |
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{ 'begin': 0xD800, 'end': 0xDFFF }, // Non-Plane 0 * |
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{ 'begin': 0x10900, 'end': 0x1091F }, // Phoenicia |
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{ 'begin': 0x4E00, 'end': 0x9FFF }, // CJK Unified Ideographs |
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{ 'begin': 0xE000, 'end': 0xF8FF }, // Private Use Area (plane 0) |
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{ 'begin': 0x31C0, 'end': 0x31EF }, // CJK Strokes |
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{ 'begin': 0xFB00, 'end': 0xFB4F }, // Alphabetic Presentation Forms |
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{ 'begin': 0xFB50, 'end': 0xFDFF }, // Arabic Presentation Forms-A |
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{ 'begin': 0xFE20, 'end': 0xFE2F }, // Combining Half Marks |
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{ 'begin': 0xFE10, 'end': 0xFE1F }, // Vertical Forms |
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{ 'begin': 0xFE50, 'end': 0xFE6F }, // Small Form Variants |
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{ 'begin': 0xFE70, 'end': 0xFEFF }, // Arabic Presentation Forms-B |
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{ 'begin': 0xFF00, 'end': 0xFFEF }, // Halfwidth And Fullwidth Forms |
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{ 'begin': 0xFFF0, 'end': 0xFFFF }, // Specials |
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{ 'begin': 0x0F00, 'end': 0x0FFF }, // Tibetan |
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{ 'begin': 0x0700, 'end': 0x074F }, // Syriac |
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{ 'begin': 0x0780, 'end': 0x07BF }, // Thaana |
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{ 'begin': 0x0D80, 'end': 0x0DFF }, // Sinhala |
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{ 'begin': 0x1000, 'end': 0x109F }, // Myanmar |
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{ 'begin': 0x1200, 'end': 0x137F }, // Ethiopic |
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{ 'begin': 0x13A0, 'end': 0x13FF }, // Cherokee |
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{ 'begin': 0x1400, 'end': 0x167F }, // Unified Canadian Aboriginal Syllabics |
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{ 'begin': 0x1680, 'end': 0x169F }, // Ogham |
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{ 'begin': 0x16A0, 'end': 0x16FF }, // Runic |
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{ 'begin': 0x1780, 'end': 0x17FF }, // Khmer |
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{ 'begin': 0x1800, 'end': 0x18AF }, // Mongolian |
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{ 'begin': 0x2800, 'end': 0x28FF }, // Braille Patterns |
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{ 'begin': 0xA000, 'end': 0xA48F }, // Yi Syllables |
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{ 'begin': 0x1700, 'end': 0x171F }, // Tagalog |
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{ 'begin': 0x10300, 'end': 0x1032F }, // Old Italic |
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{ 'begin': 0x10330, 'end': 0x1034F }, // Gothic |
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{ 'begin': 0x10400, 'end': 0x1044F }, // Deseret |
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{ 'begin': 0x1D000, 'end': 0x1D0FF }, // Byzantine Musical Symbols |
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{ 'begin': 0x1D400, 'end': 0x1D7FF }, // Mathematical Alphanumeric Symbols |
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{ 'begin': 0xFF000, 'end': 0xFFFFD }, // Private Use (plane 15) |
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{ 'begin': 0xFE00, 'end': 0xFE0F }, // Variation Selectors |
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{ 'begin': 0xE0000, 'end': 0xE007F }, // Tags |
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{ 'begin': 0x1900, 'end': 0x194F }, // Limbu |
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{ 'begin': 0x1950, 'end': 0x197F }, // Tai Le |
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{ 'begin': 0x1980, 'end': 0x19DF }, // New Tai Lue |
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{ 'begin': 0x1A00, 'end': 0x1A1F }, // Buginese |
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{ 'begin': 0x2C00, 'end': 0x2C5F }, // Glagolitic |
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{ 'begin': 0x2D30, 'end': 0x2D7F }, // Tifinagh |
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{ 'begin': 0x4DC0, 'end': 0x4DFF }, // Yijing Hexagram Symbols |
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{ 'begin': 0xA800, 'end': 0xA82F }, // Syloti Nagri |
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{ 'begin': 0x10000, 'end': 0x1007F }, // Linear B Syllabary |
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{ 'begin': 0x10140, 'end': 0x1018F }, // Ancient Greek Numbers |
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{ 'begin': 0x10380, 'end': 0x1039F }, // Ugaritic |
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{ 'begin': 0x103A0, 'end': 0x103DF }, // Old Persian |
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{ 'begin': 0x10450, 'end': 0x1047F }, // Shavian |
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{ 'begin': 0x10480, 'end': 0x104AF }, // Osmanya |
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{ 'begin': 0x10800, 'end': 0x1083F }, // Cypriot Syllabary |
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{ 'begin': 0x10A00, 'end': 0x10A5F }, // Kharoshthi |
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{ 'begin': 0x1D300, 'end': 0x1D35F }, // Tai Xuan Jing Symbols |
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{ 'begin': 0x12000, 'end': 0x123FF }, // Cuneiform |
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{ 'begin': 0x1D360, 'end': 0x1D37F }, // Counting Rod Numerals |
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{ 'begin': 0x1B80, 'end': 0x1BBF }, // Sundanese |
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{ 'begin': 0x1C00, 'end': 0x1C4F }, // Lepcha |
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{ 'begin': 0x1C50, 'end': 0x1C7F }, // Ol Chiki |
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{ 'begin': 0xA880, 'end': 0xA8DF }, // Saurashtra |
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{ 'begin': 0xA900, 'end': 0xA92F }, // Kayah Li |
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{ 'begin': 0xA930, 'end': 0xA95F }, // Rejang |
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{ 'begin': 0xAA00, 'end': 0xAA5F }, // Cham |
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{ 'begin': 0x10190, 'end': 0x101CF }, // Ancient Symbols |
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{ 'begin': 0x101D0, 'end': 0x101FF }, // Phaistos Disc |
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{ 'begin': 0x102A0, 'end': 0x102DF }, // Carian |
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{ 'begin': 0x1F030, 'end': 0x1F09F } // Domino Tiles |
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]; |
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|
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function getUnicodeRangeFor(value) { |
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for (var i = 0; i < UnicodeRanges.length; i++) { |
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var range = UnicodeRanges[i]; |
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if (value >= range.begin && value < range.end) |
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return i; |
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} |
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return -1; |
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} |
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/** |
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* 'Font' is the class the outside world should use, it encapsulate all the font |
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* decoding logics whatever type it is (assuming the font type is supported). |
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* |
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* For example to read a Type1 font and to attach it to the document: |
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* var type1Font = new Font("MyFontName", binaryFile, propertiesObject); |
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* type1Font.bind(); |
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*/ |
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var Font = (function() { |
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var constructor = function font_constructor(name, file, properties) { |
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this.name = name; |
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this.textMatrix = properties.textMatrix || IDENTITY_MATRIX; |
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this.encoding = properties.encoding; |
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this.sizes = []; |
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|
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// If the font is to be ignored, register it like an already loaded font |
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// to avoid the cost of waiting for it be be loaded by the platform. |
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if (properties.ignore) { |
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this.loadedName = 'Arial'; |
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return; |
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} |
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var data; |
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switch (properties.type) { |
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case 'Type1': |
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case 'CIDFontType0': |
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var cff = new CFF(name, file, properties); |
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this.mimetype = 'font/opentype'; |
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|
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// Wrap the CFF data inside an OTF font file |
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data = this.convert(name, cff, properties); |
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break; |
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|
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case 'TrueType': |
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case 'CIDFontType2': |
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this.mimetype = 'font/opentype'; |
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|
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// Repair the TrueType file if it is can be damaged in the point of |
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// view of the sanitizer |
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data = this.checkAndRepair(name, file, properties); |
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break; |
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default: |
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warn('Font ' + properties.type + ' is not supported'); |
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break; |
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} |
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this.data = data; |
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this.type = properties.type; |
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this.loadedName = getUniqueName(); |
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this.compositeFont = properties.compositeFont; |
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}; |
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|
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var numFonts = 0; |
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function getUniqueName() { |
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return 'pdfFont' + numFonts++; |
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} |
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|
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function stringToArray(str) { |
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var array = []; |
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for (var i = 0; i < str.length; ++i) |
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array[i] = str.charCodeAt(i); |
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|
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return array; |
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}; |
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|
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function int16(bytes) { |
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return (bytes[0] << 8) + (bytes[1] & 0xff); |
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}; |
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|
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function int32(bytes) { |
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return (bytes[0] << 24) + (bytes[1] << 16) + |
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(bytes[2] << 8) + (bytes[3] & 0xff); |
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}; |
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|
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function getMaxPower2(number) { |
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var maxPower = 0; |
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var value = number; |
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while (value >= 2) { |
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value /= 2; |
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maxPower++; |
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} |
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|
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value = 2; |
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for (var i = 1; i < maxPower; i++) |
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value *= 2; |
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return value; |
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}; |
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|
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function string16(value) { |
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return String.fromCharCode((value >> 8) & 0xff) + |
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String.fromCharCode(value & 0xff); |
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}; |
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|
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function string32(value) { |
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return String.fromCharCode((value >> 24) & 0xff) + |
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String.fromCharCode((value >> 16) & 0xff) + |
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String.fromCharCode((value >> 8) & 0xff) + |
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String.fromCharCode(value & 0xff); |
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}; |
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|
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function createOpenTypeHeader(sfnt, file, offsets, numTables) { |
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// sfnt version (4 bytes) |
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var header = sfnt; |
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|
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// numTables (2 bytes) |
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header += string16(numTables); |
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|
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// searchRange (2 bytes) |
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var tablesMaxPower2 = getMaxPower2(numTables); |
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var searchRange = tablesMaxPower2 * 16; |
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header += string16(searchRange); |
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|
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// entrySelector (2 bytes) |
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header += string16(Math.log(tablesMaxPower2) / Math.log(2)); |
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|
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// rangeShift (2 bytes) |
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header += string16(numTables * 16 - searchRange); |
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|
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file.set(stringToArray(header), offsets.currentOffset); |
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offsets.currentOffset += header.length; |
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offsets.virtualOffset += header.length; |
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}; |
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|
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function createTableEntry(file, offsets, tag, data) { |
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// offset |
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var offset = offsets.virtualOffset; |
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|
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// length |
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var length = data.length; |
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|
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// Per spec tables must be 4-bytes align so add padding as needed |
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while (data.length & 3) |
|
data.push(0x00); |
|
|
|
while (offsets.virtualOffset & 3) |
|
offsets.virtualOffset++; |
|
|
|
// checksum |
|
var checksum = 0, n = data.length; |
|
for (var i = 0; i < n; i+=4) |
|
checksum = (checksum + int32([data[i], data[i+1], data[i+2], data[i+3]])) | 0; |
|
|
|
var tableEntry = (tag + string32(checksum) + |
|
string32(offset) + string32(length)); |
|
tableEntry = stringToArray(tableEntry); |
|
file.set(tableEntry, offsets.currentOffset); |
|
|
|
offsets.currentOffset += tableEntry.length; |
|
offsets.virtualOffset += data.length; |
|
}; |
|
|
|
function getRanges(glyphs) { |
|
// Array.sort() sorts by characters, not numerically, so convert to an |
|
// array of characters. |
|
var codes = []; |
|
var length = glyphs.length; |
|
for (var n = 0; n < length; ++n) |
|
codes.push(String.fromCharCode(glyphs[n].unicode)); |
|
codes.sort(); |
|
|
|
// Split the sorted codes into ranges. |
|
var ranges = []; |
|
for (var n = 0; n < length; ) { |
|
var start = codes[n++].charCodeAt(0); |
|
var end = start; |
|
while (n < length && end + 1 == codes[n].charCodeAt(0)) { |
|
++end; |
|
++n; |
|
} |
|
ranges.push([start, end]); |
|
} |
|
return ranges; |
|
}; |
|
|
|
function createCMapTable(glyphs) { |
|
glyphs.push({ unicode: 0x0000 }); |
|
var ranges = getRanges(glyphs); |
|
|
|
var numTables = 1; |
|
var cmap = '\x00\x00' + // version |
|
string16(numTables) + // numTables |
|
'\x00\x03' + // platformID |
|
'\x00\x01' + // encodingID |
|
string32(4 + numTables * 8); // start of the table record |
|
|
|
var segCount = ranges.length + 1; |
|
var segCount2 = segCount * 2; |
|
var searchRange = getMaxPower2(segCount) * 2; |
|
var searchEntry = Math.log(segCount) / Math.log(2); |
|
var rangeShift = 2 * segCount - searchRange; |
|
|
|
// Fill up the 4 parallel arrays describing the segments. |
|
var startCount = ''; |
|
var endCount = ''; |
|
var idDeltas = ''; |
|
var idRangeOffsets = ''; |
|
var glyphsIds = ''; |
|
var bias = 0; |
|
for (var i = 0; i < segCount - 1; i++) { |
|
var range = ranges[i]; |
|
var start = range[0]; |
|
var end = range[1]; |
|
var delta = (bias - start) & 0xffff; |
|
bias += (end - start + 1); |
|
|
|
startCount += string16(start); |
|
endCount += string16(end); |
|
idDeltas += string16(delta); |
|
idRangeOffsets += string16(0); |
|
|
|
for (var j = start; j <= end; j++) { |
|
glyphsIds += string16(j); |
|
} |
|
} |
|
|
|
endCount += '\xFF\xFF'; |
|
startCount += '\xFF\xFF'; |
|
idDeltas += '\x00\x01'; |
|
idRangeOffsets += '\x00\x00'; |
|
|
|
var format314 = '\x00\x00' + // language |
|
string16(segCount2) + |
|
string16(searchRange) + |
|
string16(searchEntry) + |
|
string16(rangeShift) + |
|
endCount + '\x00\x00' + startCount + |
|
idDeltas + idRangeOffsets + glyphsIds; |
|
|
|
return stringToArray(cmap + |
|
'\x00\x04' + // format |
|
string16(format314.length + 4) + // length |
|
format314); |
|
}; |
|
|
|
function createOS2Table(properties) { |
|
var ulUnicodeRange1 = 0; |
|
var ulUnicodeRange2 = 0; |
|
var ulUnicodeRange3 = 0; |
|
var ulUnicodeRange4 = 0; |
|
|
|
var charset = properties.charset; |
|
if (charset && charset.length) { |
|
var firstCharIndex = null; |
|
var lastCharIndex = 0; |
|
|
|
for (var i = 0; i < charset.length; i++) { |
|
var code = GlyphsUnicode[charset[i]]; |
|
if (firstCharIndex > code || !firstCharIndex) |
|
firstCharIndex = code; |
|
if (lastCharIndex < code) |
|
lastCharIndex = code; |
|
|
|
var position = getUnicodeRangeFor(code); |
|
if (position < 32) { |
|
ulUnicodeRange1 |= 1 << position; |
|
} else if (position < 64) { |
|
ulUnicodeRange2 |= 1 << position - 32; |
|
} else if (position < 96) { |
|
ulUnicodeRange3 |= 1 << position - 64; |
|
} else if (position < 123) { |
|
ulUnicodeRange4 |= 1 << position - 96; |
|
} else { |
|
error('Unicode ranges Bits > 123 are reserved for internal usage'); |
|
} |
|
} |
|
} |
|
|
|
return '\x00\x03' + // version |
|
'\x02\x24' + // xAvgCharWidth |
|
'\x01\xF4' + // usWeightClass |
|
'\x00\x05' + // usWidthClass |
|
'\x00\x00' + // fstype (0 to let the font loads via font-face on IE) |
|
'\x02\x8A' + // ySubscriptXSize |
|
'\x02\xBB' + // ySubscriptYSize |
|
'\x00\x00' + // ySubscriptXOffset |
|
'\x00\x8C' + // ySubscriptYOffset |
|
'\x02\x8A' + // ySuperScriptXSize |
|
'\x02\xBB' + // ySuperScriptYSize |
|
'\x00\x00' + // ySuperScriptXOffset |
|
'\x01\xDF' + // ySuperScriptYOffset |
|
'\x00\x31' + // yStrikeOutSize |
|
'\x01\x02' + // yStrikeOutPosition |
|
'\x00\x00' + // sFamilyClass |
|
'\x00\x00\x06' + |
|
String.fromCharCode(properties.fixedPitch ? 0x09 : 0x00) + |
|
'\x00\x00\x00\x00\x00\x00' + // Panose |
|
string32(ulUnicodeRange1) + // ulUnicodeRange1 (Bits 0-31) |
|
string32(ulUnicodeRange2) + // ulUnicodeRange2 (Bits 32-63) |
|
string32(ulUnicodeRange3) + // ulUnicodeRange3 (Bits 64-95) |
|
string32(ulUnicodeRange4) + // ulUnicodeRange4 (Bits 96-127) |
|
'\x2A\x32\x31\x2A' + // achVendID |
|
string16(properties.italicAngle ? 1 : 0) + // fsSelection |
|
string16(firstCharIndex || |
|
properties.firstChar) + // usFirstCharIndex |
|
string16(lastCharIndex || properties.lastChar) + // usLastCharIndex |
|
string16(properties.ascent) + // sTypoAscender |
|
string16(properties.descent) + // sTypoDescender |
|
'\x00\x64' + // sTypoLineGap (7%-10% of the unitsPerEM value) |
|
string16(properties.ascent) + // usWinAscent |
|
string16(-properties.descent) + // usWinDescent |
|
'\x00\x00\x00\x00' + // ulCodePageRange1 (Bits 0-31) |
|
'\x00\x00\x00\x00' + // ulCodePageRange2 (Bits 32-63) |
|
string16(properties.xHeight) + // sxHeight |
|
string16(properties.capHeight) + // sCapHeight |
|
string16(0) + // usDefaultChar |
|
string16(firstCharIndex || properties.firstChar) + // usBreakChar |
|
'\x00\x03'; // usMaxContext |
|
}; |
|
|
|
function createPostTable(properties) { |
|
var angle = Math.floor(properties.italicAngle * (Math.pow(2, 16))); |
|
return '\x00\x03\x00\x00' + // Version number |
|
string32(angle) + // italicAngle |
|
'\x00\x00' + // underlinePosition |
|
'\x00\x00' + // underlineThickness |
|
string32(properties.fixedPitch) + // isFixedPitch |
|
'\x00\x00\x00\x00' + // minMemType42 |
|
'\x00\x00\x00\x00' + // maxMemType42 |
|
'\x00\x00\x00\x00' + // minMemType1 |
|
'\x00\x00\x00\x00'; // maxMemType1 |
|
}; |
|
|
|
function createNameTable(name) { |
|
var strings = [ |
|
'Original licence', // 0.Copyright |
|
name, // 1.Font family |
|
'Unknown', // 2.Font subfamily (font weight) |
|
'uniqueID', // 3.Unique ID |
|
name, // 4.Full font name |
|
'Version 0.11', // 5.Version |
|
'', // 6.Postscript name |
|
'Unknown', // 7.Trademark |
|
'Unknown', // 8.Manufacturer |
|
'Unknown' // 9.Designer |
|
]; |
|
|
|
// Mac want 1-byte per character strings while Windows want |
|
// 2-bytes per character, so duplicate the names table |
|
var stringsUnicode = []; |
|
for (var i = 0; i < strings.length; i++) { |
|
var str = strings[i]; |
|
|
|
var strUnicode = ''; |
|
for (var j = 0; j < str.length; j++) |
|
strUnicode += string16(str.charCodeAt(j)); |
|
stringsUnicode.push(strUnicode); |
|
} |
|
|
|
var names = [strings, stringsUnicode]; |
|
var platforms = ['\x00\x01', '\x00\x03']; |
|
var encodings = ['\x00\x00', '\x00\x01']; |
|
var languages = ['\x00\x00', '\x04\x09']; |
|
|
|
var namesRecordCount = strings.length * platforms.length; |
|
var nameTable = |
|
'\x00\x00' + // format |
|
string16(namesRecordCount) + // Number of names Record |
|
string16(namesRecordCount * 12 + 6); // Storage |
|
|
|
// Build the name records field |
|
var strOffset = 0; |
|
for (var i = 0; i < platforms.length; i++) { |
|
var strs = names[i]; |
|
for (var j = 0; j < strs.length; j++) { |
|
var str = strs[j]; |
|
var nameRecord = |
|
platforms[i] + // platform ID |
|
encodings[i] + // encoding ID |
|
languages[i] + // language ID |
|
string16(j) + // name ID |
|
string16(str.length) + |
|
string16(strOffset); |
|
nameTable += nameRecord; |
|
strOffset += str.length; |
|
} |
|
} |
|
|
|
nameTable += strings.join('') + stringsUnicode.join(''); |
|
return nameTable; |
|
} |
|
|
|
constructor.prototype = { |
|
name: null, |
|
font: null, |
|
mimetype: null, |
|
encoding: null, |
|
|
|
checkAndRepair: function font_checkAndRepair(name, font, properties) { |
|
function readTableEntry(file) { |
|
// tag |
|
var tag = file.getBytes(4); |
|
tag = String.fromCharCode(tag[0]) + |
|
String.fromCharCode(tag[1]) + |
|
String.fromCharCode(tag[2]) + |
|
String.fromCharCode(tag[3]); |
|
|
|
var checksum = int32(file.getBytes(4)); |
|
var offset = int32(file.getBytes(4)); |
|
var length = int32(file.getBytes(4)); |
|
|
|
// Read the table associated data |
|
var previousPosition = file.pos; |
|
file.pos = file.start ? file.start : 0; |
|
file.skip(offset); |
|
var data = file.getBytes(length); |
|
file.pos = previousPosition; |
|
|
|
if (tag == 'head') |
|
data[8] = data[9] = data[10] = data[11] = 0; // clearing checksum adjustment |
|
|
|
return { |
|
tag: tag, |
|
checksum: checksum, |
|
length: offset, |
|
offset: length, |
|
data: data |
|
}; |
|
}; |
|
|
|
function readOpenTypeHeader(ttf) { |
|
return { |
|
version: ttf.getBytes(4), |
|
numTables: int16(ttf.getBytes(2)), |
|
searchRange: int16(ttf.getBytes(2)), |
|
entrySelector: int16(ttf.getBytes(2)), |
|
rangeShift: int16(ttf.getBytes(2)) |
|
}; |
|
}; |
|
|
|
function replaceCMapTable(cmap, font, properties) { |
|
font.pos = (font.start ? font.start : 0) + cmap.length; |
|
|
|
var version = int16(font.getBytes(2)); |
|
var numTables = int16(font.getBytes(2)); |
|
|
|
for (var i = 0; i < numTables; i++) { |
|
var platformID = int16(font.getBytes(2)); |
|
var encodingID = int16(font.getBytes(2)); |
|
var offset = int32(font.getBytes(4)); |
|
var format = int16(font.getBytes(2)); |
|
var length = int16(font.getBytes(2)); |
|
var language = int16(font.getBytes(2)); |
|
|
|
if ((format == 0 && numTables == 1) || |
|
(format == 6 && numTables == 1 && !properties.encoding.empty)) { |
|
// Format 0 alone is not allowed by the sanitizer so let's rewrite |
|
// that to a 3-1-4 Unicode BMP table |
|
TODO('Use an other source of informations than ' + |
|
'charset here, it is not reliable'); |
|
var charset = properties.charset; |
|
var glyphs = []; |
|
for (var j = 0; j < charset.length; j++) { |
|
glyphs.push({ |
|
unicode: GlyphsUnicode[charset[j]] || 0 |
|
}); |
|
} |
|
|
|
cmap.data = createCMapTable(glyphs); |
|
} else if (format == 6 && numTables == 1) { |
|
// Format 6 is a 2-bytes dense mapping, which means the font data |
|
// lives glue together even if they are pretty far in the unicode |
|
// table. (This looks weird, so I can have missed something), this |
|
// works on Linux but seems to fails on Mac so let's rewrite the |
|
// cmap table to a 3-1-4 style |
|
var firstCode = int16(font.getBytes(2)); |
|
var entryCount = int16(font.getBytes(2)); |
|
|
|
var glyphs = []; |
|
var min = 0xffff, max = 0; |
|
for (var j = 0; j < entryCount; j++) { |
|
var charcode = int16(font.getBytes(2)); |
|
glyphs.push(charcode); |
|
|
|
if (charcode < min) |
|
min = charcode; |
|
if (charcode > max) |
|
max = charcode; |
|
} |
|
|
|
// Since Format 6 is a dense array, check for gaps |
|
for (var j = min; j < max; j++) { |
|
if (glyphs.indexOf(j) == -1) |
|
glyphs.push(j); |
|
} |
|
|
|
for (var j = 0; j < glyphs.length; j++) |
|
glyphs[j] = { unicode: glyphs[j] + firstCode }; |
|
|
|
var ranges = getRanges(glyphs); |
|
assert(ranges.length == 1, 'Got ' + ranges.length + |
|
' ranges in a dense array'); |
|
|
|
var encoding = properties.encoding; |
|
var denseRange = ranges[0]; |
|
var start = denseRange[0]; |
|
var end = denseRange[1]; |
|
var index = firstCode; |
|
for (var j = start; j <= end; j++) |
|
encoding[index++] = glyphs[j - firstCode - 1].unicode; |
|
cmap.data = createCMapTable(glyphs); |
|
} |
|
} |
|
}; |
|
|
|
// Check that required tables are present |
|
var requiredTables = ['OS/2', 'cmap', 'head', 'hhea', |
|
'hmtx', 'maxp', 'name', 'post']; |
|
|
|
var header = readOpenTypeHeader(font); |
|
var numTables = header.numTables; |
|
|
|
// This keep a reference to the CMap and the post tables since they can |
|
// be rewritted |
|
var cmap, post, nameTable, maxp; |
|
|
|
var tables = []; |
|
for (var i = 0; i < numTables; i++) { |
|
var table = readTableEntry(font); |
|
var index = requiredTables.indexOf(table.tag); |
|
if (index != -1) { |
|
if (table.tag == 'cmap') |
|
cmap = table; |
|
else if (table.tag == 'post') |
|
post = table; |
|
else if (table.tag == 'name') |
|
nameTable = table; |
|
else if (table.tag == 'maxp') |
|
maxp = table; |
|
|
|
requiredTables.splice(index, 1); |
|
} |
|
tables.push(table); |
|
} |
|
|
|
// If any tables are still in the array this means some required |
|
// tables are missing, which means that we need to rebuild the |
|
// font in order to pass the sanitizer. |
|
if (requiredTables.length && requiredTables[0] == 'OS/2') { |
|
// Create a new file to hold the new version of our truetype with a new |
|
// header and new offsets |
|
var ttf = new Uint8Array(kMaxFontFileSize); |
|
|
|
// The offsets object holds at the same time a representation of where |
|
// to write the table entry information about a table and another offset |
|
// representing the offset where to put the actual data of a particular |
|
// table |
|
var numTables = header.numTables + requiredTables.length; |
|
var offsets = { |
|
currentOffset: 0, |
|
virtualOffset: numTables * (4 * 4) |
|
}; |
|
|
|
// The new numbers of tables will be the last one plus the num |
|
// of missing tables |
|
createOpenTypeHeader('\x00\x01\x00\x00', ttf, offsets, numTables); |
|
|
|
// Insert the missing table |
|
tables.push({ |
|
tag: 'OS/2', |
|
data: stringToArray(createOS2Table(properties)) |
|
}); |
|
|
|
// Replace the old CMAP table with a shiny new one |
|
if (properties.type == 'CIDFontType2') { |
|
// Type2 composite fonts map characters directly to glyphs so the cmap |
|
// table must be replaced. |
|
|
|
var glyphs = []; |
|
var charset = properties.charset; |
|
if (!charset.length) { |
|
// PDF did not contain a GIDMap for the font so create an identity cmap |
|
|
|
// First get the number of glyphs from the maxp table |
|
font.pos = (font.start ? font.start : 0) + maxp.length; |
|
var version = int16(font.getBytes(4)); |
|
var numGlyphs = int16(font.getBytes(2)); |
|
|
|
// Now create an identity mapping |
|
for (var i = 1; i < numGlyphs; i++) { |
|
glyphs.push({ |
|
unicode: i |
|
}); |
|
} |
|
} else { |
|
for (var i = 1; i < charset.length; i++) { |
|
var index = charset.indexOf(i); |
|
if (index != -1) { |
|
glyphs.push({ |
|
unicode: index |
|
}); |
|
} else { |
|
break; |
|
} |
|
} |
|
} |
|
|
|
if (!cmap) { |
|
// Font did not contain a cmap |
|
tables.push({ |
|
tag: 'cmap', |
|
data: createCMapTable(glyphs) |
|
}) |
|
} else { |
|
cmap.data = createCMapTable(glyphs); |
|
} |
|
} else { |
|
replaceCMapTable(cmap, font, properties); |
|
} |
|
|
|
// Rewrite the 'post' table if needed |
|
if (!post) { |
|
tables.push({ |
|
tag: 'post', |
|
data: stringToArray(createPostTable(properties)) |
|
}); |
|
} |
|
|
|
// Rewrite the 'name' table if needed |
|
if (!nameTable) { |
|
tables.push({ |
|
tag: 'name', |
|
data: stringToArray(createNameTable(this.name)) |
|
}); |
|
} |
|
|
|
// Tables needs to be written by ascendant alphabetic order |
|
tables.sort(function tables_sort(a, b) { |
|
return (a.tag > b.tag) - (a.tag < b.tag); |
|
}); |
|
|
|
// rewrite the tables but tweak offsets |
|
for (var i = 0; i < tables.length; i++) { |
|
var table = tables[i]; |
|
var data = []; |
|
|
|
var tableData = table.data; |
|
for (var j = 0; j < tableData.length; j++) |
|
data.push(tableData[j]); |
|
createTableEntry(ttf, offsets, table.tag, data); |
|
} |
|
|
|
// Add the table datas |
|
for (var i = 0; i < tables.length; i++) { |
|
var table = tables[i]; |
|
var tableData = table.data; |
|
ttf.set(tableData, offsets.currentOffset); |
|
offsets.currentOffset += tableData.length; |
|
|
|
// 4-byte aligned data |
|
while (offsets.currentOffset & 3) |
|
offsets.currentOffset++; |
|
} |
|
|
|
var fontData = []; |
|
for (var i = 0; i < offsets.currentOffset; i++) |
|
fontData.push(ttf[i]); |
|
|
|
return fontData; |
|
} else if (requiredTables.length) { |
|
error('Table ' + requiredTables[0] + |
|
' is missing from the TrueType font'); |
|
} |
|
|
|
return font.getBytes(); |
|
}, |
|
|
|
convert: function font_convert(fontName, font, properties) { |
|
function isFixedPitch(glyphs) { |
|
for (var i = 0; i < glyphs.length - 1; i++) { |
|
if (glyphs[i] != glyphs[i + 1]) |
|
return false; |
|
} |
|
return true; |
|
}; |
|
|
|
// The offsets object holds at the same time a representation of where |
|
// to write the table entry information about a table and another offset |
|
// representing the offset where to draw the actual data of a particular |
|
// table |
|
var kRequiredTablesCount = 9; |
|
var offsets = { |
|
currentOffset: 0, |
|
virtualOffset: 9 * (4 * 4) |
|
}; |
|
|
|
var otf = new Uint8Array(kMaxFontFileSize); |
|
createOpenTypeHeader('\x4F\x54\x54\x4F', otf, offsets, 9); |
|
|
|
var charstrings = font.charstrings; |
|
properties.fixedPitch = isFixedPitch(charstrings); |
|
var fields = { |
|
// PostScript Font Program |
|
'CFF ': font.data, |
|
|
|
// OS/2 and Windows Specific metrics |
|
'OS/2': stringToArray(createOS2Table(properties)), |
|
|
|
// Character to glyphs mapping |
|
'cmap': createCMapTable(charstrings.slice()), |
|
|
|
// Font header |
|
'head': (function() { |
|
return stringToArray( |
|
'\x00\x01\x00\x00' + // Version number |
|
'\x00\x00\x10\x00' + // fontRevision |
|
'\x00\x00\x00\x00' + // checksumAdjustement |
|
'\x5F\x0F\x3C\xF5' + // magicNumber |
|
'\x00\x00' + // Flags |
|
'\x03\xE8' + // unitsPerEM (defaulting to 1000) |
|
'\x00\x00\x00\x00\x9e\x0b\x7e\x27' + // creation date |
|
'\x00\x00\x00\x00\x9e\x0b\x7e\x27' + // modifification date |
|
'\x00\x00' + // xMin |
|
string16(properties.descent) + // yMin |
|
'\x0F\xFF' + // xMax |
|
string16(properties.ascent) + // yMax |
|
string16(properties.italicAngle ? 2 : 0) + // macStyle |
|
'\x00\x11' + // lowestRecPPEM |
|
'\x00\x00' + // fontDirectionHint |
|
'\x00\x00' + // indexToLocFormat |
|
'\x00\x00'); // glyphDataFormat |
|
})(), |
|
|
|
// Horizontal header |
|
'hhea': (function() { |
|
return stringToArray( |
|
'\x00\x01\x00\x00' + // Version number |
|
string16(properties.ascent) + // Typographic Ascent |
|
string16(properties.descent) + // Typographic Descent |
|
'\x00\x00' + // Line Gap |
|
'\xFF\xFF' + // advanceWidthMax |
|
'\x00\x00' + // minLeftSidebearing |
|
'\x00\x00' + // minRightSidebearing |
|
'\x00\x00' + // xMaxExtent |
|
string16(properties.capHeight) + // caretSlopeRise |
|
string16(Math.tan(properties.italicAngle) * |
|
properties.xHeight) + // caretSlopeRun |
|
'\x00\x00' + // caretOffset |
|
'\x00\x00' + // -reserved- |
|
'\x00\x00' + // -reserved- |
|
'\x00\x00' + // -reserved- |
|
'\x00\x00' + // -reserved- |
|
'\x00\x00' + // metricDataFormat |
|
string16(charstrings.length + 1)); // Number of HMetrics |
|
})(), |
|
|
|
// Horizontal metrics |
|
'hmtx': (function() { |
|
var hmtx = '\x00\x00\x00\x00'; // Fake .notdef |
|
for (var i = 0; i < charstrings.length; i++) { |
|
hmtx += string16(charstrings[i].width) + string16(0); |
|
} |
|
return stringToArray(hmtx); |
|
})(), |
|
|
|
// Maximum profile |
|
'maxp': (function() { |
|
return stringToArray( |
|
'\x00\x00\x50\x00' + // Version number |
|
string16(charstrings.length + 1)); // Num of glyphs |
|
})(), |
|
|
|
// Naming tables |
|
'name': stringToArray(createNameTable(fontName)), |
|
|
|
// PostScript informations |
|
'post': stringToArray(createPostTable(properties)) |
|
}; |
|
|
|
for (var field in fields) |
|
createTableEntry(otf, offsets, field, fields[field]); |
|
|
|
for (var field in fields) { |
|
var table = fields[field]; |
|
otf.set(table, offsets.currentOffset); |
|
offsets.currentOffset += table.length; |
|
} |
|
|
|
var fontData = []; |
|
for (var i = 0; i < offsets.currentOffset; i++) |
|
fontData.push(otf[i]); |
|
return fontData; |
|
}, |
|
|
|
bindWorker: function font_bindWorker(data) { |
|
postMessage({ |
|
action: 'font', |
|
data: { |
|
raw: data, |
|
fontName: this.loadedName, |
|
mimetype: this.mimetype |
|
} |
|
}); |
|
}, |
|
|
|
bindDOM: function font_bindDom(data) { |
|
var fontName = this.loadedName; |
|
|
|
// Add the font-face rule to the document |
|
var url = ('url(data:' + this.mimetype + ';base64,' + |
|
window.btoa(data) + ');'); |
|
var rule = "@font-face { font-family:'" + fontName + "';src:" + url + '}'; |
|
var styleSheet = document.styleSheets[0]; |
|
styleSheet.insertRule(rule, styleSheet.cssRules.length); |
|
|
|
return rule; |
|
}, |
|
|
|
charsToUnicode: function fonts_chars2Unicode(chars) { |
|
var charsCache = this.charsCache; |
|
var str; |
|
|
|
// if we translated this string before, just grab it from the cache |
|
if (charsCache) { |
|
str = charsCache[chars]; |
|
if (str) |
|
return str; |
|
} |
|
|
|
// lazily create the translation cache |
|
if (!charsCache) |
|
charsCache = this.charsCache = Object.create(null); |
|
|
|
if (this.compositeFont) { |
|
// composite fonts have multi-byte strings |
|
// convert the string from single-byte to multi-byte |
|
// XXX assuming CIDFonts are two-byte - later need to extract the correct byte encoding |
|
// according to the PDF spec |
|
str = ''; |
|
var multiByteStr = ""; |
|
var length = chars.length; |
|
for (var i = 0; i < length; i++) { |
|
var byte1 = chars.charCodeAt(i++) & 0xFF; |
|
var byte2; |
|
if (i == length) |
|
byte2 = 0; |
|
else |
|
byte2 = chars.charCodeAt(i) & 0xFF; |
|
multiByteStr += String.fromCharCode((byte1 << 8) | byte2); |
|
} |
|
str = multiByteStr; |
|
} |
|
else { |
|
// translate the string using the font's encoding |
|
var encoding = this.encoding; |
|
if (!encoding) |
|
return chars; |
|
|
|
str = ''; |
|
for (var i = 0; i < chars.length; ++i) { |
|
var charcode = chars.charCodeAt(i); |
|
var unicode = encoding[charcode]; |
|
if ('undefined' == typeof(unicode)) { |
|
// FIXME/issue 233: we're hitting this in test/pdf/sizes.pdf |
|
// at the moment, for unknown reasons. |
|
warn('Unencoded charcode '+ charcode); |
|
unicode = charcode; |
|
} |
|
|
|
// Check if the glyph has already been converted |
|
if (!IsNum(unicode)) |
|
unicode = encoding[unicode] = GlyphsUnicode[unicode.name]; |
|
|
|
// Handle surrogate pairs |
|
if (unicode > 0xFFFF) { |
|
str += String.fromCharCode(unicode & 0xFFFF); |
|
unicode >>= 16; |
|
} |
|
str += String.fromCharCode(unicode); |
|
} |
|
} |
|
|
|
// Enter the translated string into the cache |
|
return charsCache[chars] = str; |
|
} |
|
}; |
|
|
|
return constructor; |
|
})(); |
|
|
|
/** |
|
* Type1Parser encapsulate the needed code for parsing a Type1 font |
|
* program. Some of its logic depends on the Type2 charstrings |
|
* structure. |
|
*/ |
|
var Type1Parser = function() { |
|
/* |
|
* Decrypt a Sequence of Ciphertext Bytes to Produce the Original Sequence |
|
* of Plaintext Bytes. The function took a key as a parameter which can be |
|
* for decrypting the eexec block of for decoding charStrings. |
|
*/ |
|
var kEexecEncryptionKey = 55665; |
|
var kCharStringsEncryptionKey = 4330; |
|
|
|
function decrypt(stream, key, discardNumber) { |
|
var r = key, c1 = 52845, c2 = 22719; |
|
var decryptedString = []; |
|
|
|
var value = ''; |
|
var count = stream.length; |
|
for (var i = 0; i < count; i++) { |
|
value = stream[i]; |
|
decryptedString[i] = value ^ (r >> 8); |
|
r = ((value + r) * c1 + c2) & ((1 << 16) - 1); |
|
} |
|
return decryptedString.slice(discardNumber); |
|
}; |
|
|
|
/* |
|
* CharStrings are encoded following the the CharString Encoding sequence |
|
* describe in Chapter 6 of the "Adobe Type1 Font Format" specification. |
|
* The value in a byte indicates a command, a number, or subsequent bytes |
|
* that are to be interpreted in a special way. |
|
* |
|
* CharString Number Encoding: |
|
* A CharString byte containing the values from 32 through 255 inclusive |
|
* indicate an integer. These values are decoded in four ranges. |
|
* |
|
* 1. A CharString byte containing a value, v, between 32 and 246 inclusive, |
|
* indicate the integer v - 139. Thus, the integer values from -107 through |
|
* 107 inclusive may be encoded in single byte. |
|
* |
|
* 2. A CharString byte containing a value, v, between 247 and 250 inclusive, |
|
* indicates an integer involving the next byte, w, according to the formula: |
|
* [(v - 247) x 256] + w + 108 |
|
* |
|
* 3. A CharString byte containing a value, v, between 251 and 254 inclusive, |
|
* indicates an integer involving the next byte, w, according to the formula: |
|
* -[(v - 251) * 256] - w - 108 |
|
* |
|
* 4. A CharString containing the value 255 indicates that the next 4 bytes |
|
* are a two complement signed integer. The first of these bytes contains the |
|
* highest order bits, the second byte contains the next higher order bits |
|
* and the fourth byte contain the lowest order bits. |
|
* |
|
* |
|
* CharString Command Encoding: |
|
* CharStrings commands are encoded in 1 or 2 bytes. |
|
* |
|
* Single byte commands are encoded in 1 byte that contains a value between |
|
* 0 and 31 inclusive. |
|
* If a command byte contains the value 12, then the value in the next byte |
|
* indicates a command. This "escape" mechanism allows many extra commands |
|
* to be encoded and this encoding technique helps to minimize the length of |
|
* the charStrings. |
|
*/ |
|
var charStringDictionary = { |
|
'1': 'hstem', |
|
'3': 'vstem', |
|
'4': 'vmoveto', |
|
'5': 'rlineto', |
|
'6': 'hlineto', |
|
'7': 'vlineto', |
|
'8': 'rrcurveto', |
|
|
|
// closepath is a Type1 command that do not take argument and is useless |
|
// in Type2 and it can simply be ignored. |
|
'9': null, // closepath |
|
|
|
'10': 'callsubr', |
|
|
|
// return is normally used inside sub-routines to tells to the execution |
|
// flow that it can be back to normal. |
|
// During the translation process Type1 charstrings will be flattened and |
|
// sub-routines will be embedded directly into the charstring directly, so |
|
// this can be ignored safely. |
|
'11': 'return', |
|
|
|
'12': { |
|
// dotsection is a Type1 command to specify some hinting feature for dots |
|
// that do not take a parameter and it can safely be ignored for Type2. |
|
'0': null, // dotsection |
|
|
|
// [vh]stem3 are Type1 only and Type2 supports [vh]stem with multiple |
|
// parameters, so instead of returning [vh]stem3 take a shortcut and |
|
// return [vhstem] instead. |
|
'1': 'vstem', |
|
'2': 'hstem', |
|
|
|
// Type1 only command with command not (yet) built-in ,throw an error |
|
'6': -1, // seac |
|
'7': -1, //sbw |
|
|
|
'11': 'sub', |
|
'12': 'div', |
|
|
|
// callothersubr is a mechanism to make calls on the postscript |
|
// interpreter, this is not supported by Type2 charstring but hopefully |
|
// most of the default commands can be ignored safely. |
|
'16': 'callothersubr', |
|
|
|
'17': 'pop', |
|
|
|
// setcurrentpoint sets the current point to x, y without performing a |
|
// moveto (this is a one shot positionning command). This is used only |
|
// with the return of an OtherSubrs call. |
|
// TODO Implement the OtherSubrs charstring embedding and replace this |
|
// call by a no-op, like 2 'pop' commands for example. |
|
'33': null //setcurrentpoint |
|
}, |
|
'13': 'hsbw', |
|
'14': 'endchar', |
|
'21': 'rmoveto', |
|
'22': 'hmoveto', |
|
'30': 'vhcurveto', |
|
'31': 'hvcurveto' |
|
}; |
|
|
|
var kEscapeCommand = 12; |
|
|
|
function decodeCharString(array) { |
|
var charstring = []; |
|
var lsb = 0; |
|
var width = 0; |
|
var used = false; |
|
|
|
var value = ''; |
|
var count = array.length; |
|
for (var i = 0; i < count; i++) { |
|
value = parseInt(array[i]); |
|
|
|
if (value < 32) { |
|
var command = null; |
|
if (value == kEscapeCommand) { |
|
var escape = array[++i]; |
|
|
|
// TODO Clean this code |
|
if (escape == 16) { |
|
var index = charstring.pop(); |
|
var argc = charstring.pop(); |
|
var data = charstring.pop(); |
|
|
|
// If the flex mechanishm is not used in a font program, Adobe |
|
// state that that entries 0, 1 and 2 can simply be replace by |
|
// {}, which means that we can simply ignore them. |
|
if (index < 3) { |
|
continue; |
|
} |
|
|
|
// This is the same things about hint replacement, if it is not used |
|
// entry 3 can be replaced by {3} |
|
if (index == 3) { |
|
charstring.push(3); |
|
i++; |
|
continue; |
|
} |
|
} |
|
|
|
command = charStringDictionary['12'][escape]; |
|
} else { |
|
// TODO Clean this code |
|
if (value == 13) { |
|
if (charstring.length == 2) { |
|
width = charstring[1]; |
|
} else if (charstring.length == 4 && charstring[3] == 'div') { |
|
width = charstring[1] / charstring[2]; |
|
} else { |
|
error('Unsupported hsbw format: ' + charstring); |
|
} |
|
|
|
lsb = charstring[0]; |
|
charstring.push(lsb, 'hmoveto'); |
|
charstring.splice(0, 1); |
|
continue; |
|
} |
|
command = charStringDictionary[value]; |
|
} |
|
|
|
// Some charstring commands are meaningless in Type2 and will return |
|
// a null, let's just ignored them |
|
if (!command && i < count) { |
|
continue; |
|
} else if (!command) { |
|
break; |
|
} else if (command == -1) { |
|
error('Support for Type1 command ' + value + |
|
' (' + escape + ') is not implemented in charstring: ' + |
|
charString); |
|
} |
|
|
|
value = command; |
|
} else if (value <= 246) { |
|
value = parseInt(value) - 139; |
|
} else if (value <= 250) { |
|
value = ((value - 247) * 256) + parseInt(array[++i]) + 108; |
|
} else if (value <= 254) { |
|
value = -((value - 251) * 256) - parseInt(array[++i]) - 108; |
|
} else { |
|
value = (array[++i] & 0xff) << 24 | (array[++i] & 0xff) << 16 | |
|
(array[++i] & 0xff) << 8 | (array[++i] & 0xff) << 0; |
|
} |
|
|
|
charstring.push(value); |
|
} |
|
|
|
return { charstring: charstring, width: width, lsb: lsb }; |
|
}; |
|
|
|
/** |
|
* Returns an object containing a Subrs array and a CharStrings |
|
* array extracted from and eexec encrypted block of data |
|
*/ |
|
function readNumberArray(str, index) { |
|
var start = ++index; |
|
var count = 0; |
|
while (str[index++] != ']') |
|
count++; |
|
|
|
var array = str.substr(start, count).split(' '); |
|
for (var i = 0; i < array.length; i++) |
|
array[i] = parseFloat(array[i] || 0); |
|
return array; |
|
}; |
|
|
|
function readNumber(str, index) { |
|
while (str[index++] == ' ') |
|
; |
|
var start = index; |
|
|
|
var count = 0; |
|
while (str[index++] != ' ') |
|
count++; |
|
|
|
return parseFloat(str.substr(start, count) || 0); |
|
}; |
|
|
|
this.extractFontProgram = function t1_extractFontProgram(stream) { |
|
var eexec = decrypt(stream, kEexecEncryptionKey, 4); |
|
var eexecStr = ''; |
|
for (var i = 0; i < eexec.length; i++) |
|
eexecStr += String.fromCharCode(eexec[i]); |
|
|
|
var glyphsSection = false, subrsSection = false; |
|
var program = { |
|
subrs: [], |
|
charstrings: [], |
|
properties: { |
|
'private': {} |
|
} |
|
}; |
|
|
|
var glyph = ''; |
|
var token = ''; |
|
var length = 0; |
|
|
|
var c = ''; |
|
var count = eexecStr.length; |
|
for (var i = 0; i < count; i++) { |
|
var c = eexecStr[i]; |
|
|
|
if ((glyphsSection || subrsSection) && c == 'R') { |
|
var data = eexec.slice(i + 3, i + 3 + length); |
|
var encoded = decrypt(data, kCharStringsEncryptionKey, 4); |
|
var str = decodeCharString(encoded); |
|
|
|
if (glyphsSection) { |
|
program.charstrings.push({ |
|
glyph: glyph, |
|
data: str.charstring, |
|
lsb: str.lsb, |
|
width: str.width |
|
}); |
|
} else { |
|
program.subrs.push(str.charstring); |
|
} |
|
i += length + 3; |
|
} else if (c == ' ' || c == '\n') { |
|
length = parseInt(token); |
|
token = ''; |
|
} else { |
|
token += c; |
|
if (!glyphsSection) { |
|
switch (token) { |
|
case '/CharString': |
|
glyphsSection = true; |
|
break; |
|
case '/Subrs': |
|
subrsSection = true; |
|
break; |
|
case '/BlueValues': |
|
case '/OtherBlues': |
|
case '/FamilyBlues': |
|
case '/FamilyOtherBlues': |
|
case '/StemSnapH': |
|
case '/StemSnapV': |
|
program.properties.private[token.substring(1)] = readNumberArray(eexecStr, i + 2); |
|
break; |
|
case '/StdHW': |
|
case '/StdVW': |
|
program.properties.private[token.substring(1)] = readNumberArray(eexecStr, i + 2)[0]; |
|
break; |
|
case '/BlueShift': |
|
case '/BlueFuzz': |
|
case '/BlueScale': |
|
case '/LanguageGroup': |
|
case '/ExpansionFactor': |
|
program.properties.private[token.substring(1)] = readNumber(eexecStr, i + 1); |
|
break; |
|
} |
|
} else if (c == '/') { |
|
token = glyph = ''; |
|
while ((c = eexecStr[++i]) != ' ') |
|
glyph += c; |
|
} |
|
} |
|
} |
|
|
|
return program; |
|
}, |
|
|
|
this.extractFontHeader = function t1_extractFontProgram(stream) { |
|
var headerString = ''; |
|
for (var i = 0; i < stream.length; i++) |
|
headerString += String.fromCharCode(stream[i]); |
|
|
|
var info = { |
|
textMatrix: null |
|
}; |
|
|
|
var token = ''; |
|
var count = headerString.length; |
|
for (var i = 0; i < count; i++) { |
|
var c = headerString[i]; |
|
if (c == ' ' || c == '\n') { |
|
switch (token) { |
|
case '/FontMatrix': |
|
var matrix = readNumberArray(headerString, i + 1); |
|
|
|
// The FontMatrix is in unitPerEm, so make it pixels |
|
for (var j = 0; j < matrix.length; j++) |
|
matrix[j] *= 1000; |
|
|
|
// Make the angle into the right direction |
|
matrix[2] *= -1; |
|
|
|
info.textMatrix = matrix; |
|
break; |
|
} |
|
token = ''; |
|
} else { |
|
token += c; |
|
} |
|
} |
|
|
|
return info; |
|
}; |
|
}; |
|
|
|
/** |
|
* The CFF class takes a Type1 file and wrap it into a 'Compact Font Format', |
|
* which itself embed Type2 charstrings. |
|
*/ |
|
var CFFStrings = [ |
|
'.notdef', 'space', 'exclam', 'quotedbl', 'numbersign', 'dollar', 'percent', |
|
'ampersand', 'quoteright', 'parenleft', 'parenright', 'asterisk', 'plus', |
|
'comma', 'hyphen', 'period', 'slash', 'zero', 'one', 'two', 'three', 'four', |
|
'five', 'six', 'seven', 'eight', 'nine', 'colon', 'semicolon', 'less', |
|
'equal', 'greater', 'question', 'at', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', |
|
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', |
|
'X', 'Y', 'Z', 'bracketleft', 'backslash', 'bracketright', 'asciicircum', |
|
'underscore', 'quoteleft', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', |
|
'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', |
|
'z', 'braceleft', 'bar', 'braceright', 'asciitilde', 'exclamdown', 'cent', |
|
'sterling', 'fraction', 'yen', 'florin', 'section', 'currency', |
|
'quotesingle', 'quotedblleft', 'guillemotleft', 'guilsinglleft', |
|
'guilsinglright', 'fi', 'fl', 'endash', 'dagger', 'daggerdbl', |
|
'periodcentered', 'paragraph', 'bullet', 'quotesinglbase', 'quotedblbase', |
|
'quotedblright', 'guillemotright', 'ellipsis', 'perthousand', 'questiondown', |
|
'grave', 'acute', 'circumflex', 'tilde', 'macron', 'breve', 'dotaccent', |
|
'dieresis', 'ring', 'cedilla', 'hungarumlaut', 'ogonek', 'caron', 'emdash', |
|
'AE', 'ordfeminine', 'Lslash', 'Oslash', 'OE', 'ordmasculine', 'ae', |
|
'dotlessi', 'lslash', 'oslash', 'oe', 'germandbls', 'onesuperior', |
|
'logicalnot', 'mu', 'trademark', 'Eth', 'onehalf', 'plusminus', 'Thorn', |
|
'onequarter', 'divide', 'brokenbar', 'degree', 'thorn', 'threequarters', |
|
'twosuperior', 'registered', 'minus', 'eth', 'multiply', 'threesuperior', |
|
'copyright', 'Aacute', 'Acircumflex', 'Adieresis', 'Agrave', 'Aring', |
|
'Atilde', 'Ccedilla', 'Eacute', 'Ecircumflex', 'Edieresis', 'Egrave', |
|
'Iacute', 'Icircumflex', 'Idieresis', 'Igrave', 'Ntilde', 'Oacute', |
|
'Ocircumflex', 'Odieresis', 'Ograve', 'Otilde', 'Scaron', 'Uacute', |
|
'Ucircumflex', 'Udieresis', 'Ugrave', 'Yacute', 'Ydieresis', 'Zcaron', |
|
'aacute', 'acircumflex', 'adieresis', 'agrave', 'aring', 'atilde', |
|
'ccedilla', 'eacute', 'ecircumflex', 'edieresis', 'egrave', 'iacute', |
|
'icircumflex', 'idieresis', 'igrave', 'ntilde', 'oacute', 'ocircumflex', |
|
'odieresis', 'ograve', 'otilde', 'scaron', 'uacute', 'ucircumflex', |
|
'udieresis', 'ugrave', 'yacute', 'ydieresis', 'zcaron', 'exclamsmall', |
|
'Hungarumlautsmall', 'dollaroldstyle', 'dollarsuperior', 'ampersandsmall', |
|
'Acutesmall', 'parenleftsuperior', 'parenrightsuperior', '266 ff', |
|
'onedotenleader', 'zerooldstyle', 'oneoldstyle', 'twooldstyle', |
|
'threeoldstyle', 'fouroldstyle', 'fiveoldstyle', 'sixoldstyle', |
|
'sevenoldstyle', 'eightoldstyle', 'nineoldstyle', 'commasuperior', |
|
'threequartersemdash', 'periodsuperior', 'questionsmall', 'asuperior', |
|
'bsuperior', 'centsuperior', 'dsuperior', 'esuperior', 'isuperior', |
|
'lsuperior', 'msuperior', 'nsuperior', 'osuperior', 'rsuperior', 'ssuperior', |
|
'tsuperior', 'ff', 'ffi', 'ffl', 'parenleftinferior', 'parenrightinferior', |
|
'Circumflexsmall', 'hyphensuperior', 'Gravesmall', 'Asmall', 'Bsmall', |
|
'Csmall', 'Dsmall', 'Esmall', 'Fsmall', 'Gsmall', 'Hsmall', 'Ismall', |
|
'Jsmall', 'Ksmall', 'Lsmall', 'Msmall', 'Nsmall', 'Osmall', 'Psmall', |
|
'Qsmall', 'Rsmall', 'Ssmall', 'Tsmall', 'Usmall', 'Vsmall', 'Wsmall', |
|
'Xsmall', 'Ysmall', 'Zsmall', 'colonmonetary', 'onefitted', 'rupiah', |
|
'Tildesmall', 'exclamdownsmall', 'centoldstyle', 'Lslashsmall', |
|
'Scaronsmall', 'Zcaronsmall', 'Dieresissmall', 'Brevesmall', 'Caronsmall', |
|
'Dotaccentsmall', 'Macronsmall', 'figuredash', 'hypheninferior', |
|
'Ogoneksmall', 'Ringsmall', 'Cedillasmall', 'questiondownsmall', 'oneeighth', |
|
'threeeighths', 'fiveeighths', 'seveneighths', 'onethird', 'twothirds', |
|
'zerosuperior', 'foursuperior', 'fivesuperior', 'sixsuperior', |
|
'sevensuperior', 'eightsuperior', 'ninesuperior', 'zeroinferior', |
|
'oneinferior', 'twoinferior', 'threeinferior', 'fourinferior', |
|
'fiveinferior', 'sixinferior', 'seveninferior', 'eightinferior', |
|
'nineinferior', 'centinferior', 'dollarinferior', 'periodinferior', |
|
'commainferior', 'Agravesmall', 'Aacutesmall', 'Acircumflexsmall', |
|
'Atildesmall', 'Adieresissmall', 'Aringsmall', 'AEsmall', 'Ccedillasmall', |
|
'Egravesmall', 'Eacutesmall', 'Ecircumflexsmall', 'Edieresissmall', |
|
'Igravesmall', 'Iacutesmall', 'Icircumflexsmall', 'Idieresissmall', |
|
'Ethsmall', 'Ntildesmall', 'Ogravesmall', 'Oacutesmall', 'Ocircumflexsmall', |
|
'Otildesmall', 'Odieresissmall', 'OEsmall', 'Oslashsmall', 'Ugravesmall', |
|
'Uacutesmall', 'Ucircumflexsmall', 'Udieresissmall', 'Yacutesmall', |
|
'Thornsmall', 'Ydieresissmall', '001.000', '001.001', '001.002', '001.003', |
|
'Black', 'Bold', 'Book', 'Light', 'Medium', 'Regular', 'Roman', 'Semibold' |
|
]; |
|
|
|
var type1Parser = new Type1Parser(); |
|
|
|
var CFF = function(name, file, properties) { |
|
// Get the data block containing glyphs and subrs informations |
|
var length1 = file.dict.get('Length1'); |
|
var length2 = file.dict.get('Length2'); |
|
|
|
var headerBlock = file.getBytes(length1); |
|
var header = type1Parser.extractFontHeader(headerBlock); |
|
for (var info in header) |
|
properties[info] = header[info]; |
|
|
|
// Decrypt the data blocks and retrieve it's content |
|
var eexecBlock = file.getBytes(length2); |
|
var data = type1Parser.extractFontProgram(eexecBlock); |
|
for (var info in data.properties) |
|
properties[info] = data.properties[info]; |
|
|
|
var charstrings = this.getOrderedCharStrings(data.charstrings); |
|
var type2Charstrings = this.getType2Charstrings(charstrings); |
|
var subrs = this.getType2Subrs(data.subrs); |
|
|
|
this.charstrings = charstrings; |
|
this.data = this.wrap(name, type2Charstrings, this.charstrings, |
|
subrs, properties); |
|
}; |
|
|
|
CFF.prototype = { |
|
createCFFIndexHeader: function cff_createCFFIndexHeader(objects, isByte) { |
|
// First 2 bytes contains the number of objects contained into this index |
|
var count = objects.length; |
|
|
|
// If there is no object, just create an array saying that with another |
|
// offset byte. |
|
if (count == 0) |
|
return '\x00\x00\x00'; |
|
|
|
var data = String.fromCharCode(count >> 8, count & 0xff); |
|
|
|
// Next byte contains the offset size use to reference object in the file |
|
// Actually we're using 0x04 to be sure to be able to store everything |
|
// without thinking of it while coding. |
|
data += '\x04'; |
|
|
|
// Add another offset after this one because we need a new offset |
|
var relativeOffset = 1; |
|
for (var i = 0; i < count + 1; i++) { |
|
data += String.fromCharCode((relativeOffset >>> 24) & 0xFF, (relativeOffset >> 16) & 0xFF, |
|
(relativeOffset >> 8) & 0xFF, relativeOffset & 0xFF); |
|
|
|
if (objects[i]) |
|
relativeOffset += objects[i].length; |
|
} |
|
|
|
for (var i = 0; i < count; i++) { |
|
for (var j = 0; j < objects[i].length; j++) |
|
data += isByte ? String.fromCharCode(objects[i][j] & 0xFF) : objects[i][j]; |
|
} |
|
return data; |
|
}, |
|
|
|
encodeNumber: function cff_encodeNumber(value) { |
|
if (value >= -32768 && value <= 32767) { |
|
return '\x1c' + |
|
String.fromCharCode((value >> 8) & 0xFF) + |
|
String.fromCharCode(value & 0xFF); |
|
} else if (value >= (-2147483648) && value <= 2147483647) { |
|
return '\xff' + |
|
String.fromCharCode((value >>> 24) & 0xFF) + |
|
String.fromCharCode((value >> 16) & 0xFF) + |
|
String.fromCharCode((value >> 8) & 0xFF) + |
|
String.fromCharCode(value & 0xFF); |
|
} |
|
error('Value: ' + value + ' is not allowed'); |
|
return null; |
|
}, |
|
|
|
getOrderedCharStrings: function cff_getOrderedCharStrings(glyphs) { |
|
var charstrings = []; |
|
|
|
for (var i = 0; i < glyphs.length; i++) { |
|
var glyph = glyphs[i]; |
|
var unicode = GlyphsUnicode[glyph.glyph]; |
|
if (!unicode) { |
|
if (glyph.glyph != '.notdef') { |
|
warn(glyph.glyph + |
|
' does not have an entry in the glyphs unicode dictionary'); |
|
} |
|
} else { |
|
charstrings.push({ |
|
glyph: glyph, |
|
unicode: unicode, |
|
charstring: glyph.data, |
|
width: glyph.width, |
|
lsb: glyph.lsb |
|
}); |
|
} |
|
} |
|
|
|
charstrings.sort(function charstrings_sort(a, b) { |
|
return a.unicode - b.unicode; |
|
}); |
|
return charstrings; |
|
}, |
|
|
|
getType2Charstrings: function cff_getType2Charstrings(type1Charstrings) { |
|
var type2Charstrings = []; |
|
var count = type1Charstrings.length; |
|
for (var i = 0; i < count; i++) { |
|
var charstring = type1Charstrings[i].charstring; |
|
type2Charstrings.push(this.flattenCharstring(charstring.slice(), |
|
this.commandsMap)); |
|
} |
|
return type2Charstrings; |
|
}, |
|
|
|
getType2Subrs: function cff_getType2Charstrings(type1Subrs) { |
|
var bias = 0; |
|
var count = type1Subrs.length; |
|
if (count < 1240) |
|
bias = 107; |
|
else if (count < 33900) |
|
bias = 1131; |
|
else |
|
bias = 32768; |
|
|
|
// Add a bunch of empty subrs to deal with the Type2 bias |
|
var type2Subrs = []; |
|
for (var i = 0; i < bias; i++) |
|
type2Subrs.push([0x0B]); |
|
|
|
for (var i = 0; i < count; i++) |
|
type2Subrs.push(this.flattenCharstring(type1Subrs[i], this.commandsMap)); |
|
|
|
return type2Subrs; |
|
}, |
|
|
|
/* |
|
* Flatten the commands by interpreting the postscript code and replacing |
|
* every 'callsubr', 'callothersubr' by the real commands. |
|
*/ |
|
commandsMap: { |
|
'hstem': 1, |
|
'vstem': 3, |
|
'vmoveto': 4, |
|
'rlineto': 5, |
|
'hlineto': 6, |
|
'vlineto': 7, |
|
'rrcurveto': 8, |
|
'callsubr': 10, |
|
'return': 11, |
|
'sub': [12, 11], |
|
'div': [12, 12], |
|
'pop': [1, 12, 18], |
|
'endchar': 14, |
|
'rmoveto': 21, |
|
'hmoveto': 22, |
|
'vhcurveto': 30, |
|
'hvcurveto': 31 |
|
}, |
|
|
|
flattenCharstring: function flattenCharstring(charstring, map) { |
|
for (var i = 0; i < charstring.length; i++) { |
|
var command = charstring[i]; |
|
if (command.charAt) { |
|
var cmd = map[command]; |
|
assert(cmd, 'Unknow command: ' + command); |
|
|
|
if (IsArray(cmd)) { |
|
charstring.splice(i++, 1, cmd[0], cmd[1]); |
|
} else { |
|
charstring[i] = cmd; |
|
} |
|
} else { |
|
charstring.splice(i, 1, 28, command >> 8, command & 0xff); |
|
i += 2; |
|
} |
|
} |
|
return charstring; |
|
}, |
|
|
|
wrap: function wrap(name, glyphs, charstrings, subrs, properties) { |
|
var fields = { |
|
// major version, minor version, header size, offset size |
|
'header': '\x01\x00\x04\x04', |
|
|
|
'names': this.createCFFIndexHeader([name]), |
|
|
|
'topDict': (function topDict(self) { |
|
return function() { |
|
var dict = |
|
'\x00\x01\x01\x01\x30' + |
|
'\xf8\x1b\x00' + // version |
|
'\xf8\x1c\x01' + // Notice |
|
'\xf8\x1d\x02' + // FullName |
|
'\xf8\x1e\x03' + // FamilyName |
|
'\xf8\x1f\x04' + // Weight |
|
'\x1c\x00\x00\x10'; // Encoding |
|
|
|
var boundingBox = properties.bbox; |
|
for (var i = 0; i < boundingBox.length; i++) |
|
dict += self.encodeNumber(boundingBox[i]); |
|
dict += '\x05'; // FontBBox; |
|
|
|
var offset = fields.header.length + |
|
fields.names.length + |
|
(dict.length + (4 + 4 + 7)) + |
|
fields.strings.length + |
|
fields.globalSubrs.length; |
|
dict += self.encodeNumber(offset) + '\x0f'; // Charset |
|
|
|
offset = offset + (glyphs.length * 2) + 1; |
|
dict += self.encodeNumber(offset) + '\x11'; // Charstrings |
|
|
|
dict += self.encodeNumber(fields.private.length); |
|
offset = offset + fields.charstrings.length; |
|
dict += self.encodeNumber(offset) + '\x12'; // Private |
|
|
|
return dict; |
|
}; |
|
})(this), |
|
|
|
'strings': (function strings(self) { |
|
var strings = [ |
|
'Version 0.11', // Version |
|
'See original notice', // Notice |
|
name, // FullName |
|
name, // FamilyName |
|
'Medium' // Weight |
|
]; |
|
return self.createCFFIndexHeader(strings); |
|
})(this), |
|
|
|
'globalSubrs': this.createCFFIndexHeader([]), |
|
|
|
'charset': (function charset(self) { |
|
var charset = '\x00'; // Encoding |
|
|
|
var count = glyphs.length; |
|
for (var i = 0; i < count; i++) { |
|
var index = CFFStrings.indexOf(charstrings[i].glyph.glyph); |
|
// Some characters like asterikmath && circlecopyrt are |
|
// missing from the original strings, for the moment let's |
|
// map them to .notdef and see later if it cause any |
|
// problems |
|
if (index == -1) |
|
index = 0; |
|
|
|
charset += String.fromCharCode(index >> 8, index & 0xff); |
|
} |
|
return charset; |
|
})(this), |
|
|
|
'charstrings': this.createCFFIndexHeader([[0x8B, 0x0E]].concat(glyphs), |
|
true), |
|
|
|
'private': (function(self) { |
|
var data = |
|
'\x8b\x14' + // defaultWidth |
|
'\x8b\x15'; // nominalWidth |
|
var fieldMap = { |
|
BlueValues: '\x06', |
|
OtherBlues: '\x07', |
|
FamilyBlues: '\x08', |
|
FamilyOtherBlues: '\x09', |
|
StemSnapH: '\x0c\x0c', |
|
StemSnapV: '\x0c\x0d', |
|
BlueShift: '\x0c\x0a', |
|
BlueFuzz: '\x0c\x0b', |
|
BlueScale: '\x0c\x09', |
|
LanguageGroup: '\x0c\x11', |
|
ExpansionFactor: '\x0c\x18' |
|
}; |
|
for (var field in fieldMap) { |
|
if (!properties.private.hasOwnProperty(field)) continue; |
|
var value = properties.private[field]; |
|
|
|
if (IsArray(value)) { |
|
data += self.encodeNumber(value[0]); |
|
for (var i = 1; i < value.length; i++) |
|
data += self.encodeNumber(value[i] - value[i - 1]); |
|
} else { |
|
data += self.encodeNumber(value); |
|
} |
|
data += fieldMap[field]; |
|
} |
|
|
|
data += self.encodeNumber(data.length + 4) + '\x13'; // Subrs offset |
|
|
|
return data; |
|
})(this), |
|
|
|
'localSubrs': this.createCFFIndexHeader(subrs, true) |
|
}; |
|
fields.topDict = fields.topDict(); |
|
|
|
|
|
var cff = []; |
|
for (var index in fields) { |
|
var field = fields[index]; |
|
for (var i = 0; i < field.length; i++) |
|
cff.push(field.charCodeAt(i)); |
|
} |
|
|
|
return cff; |
|
} |
|
}; |
|
|
|
|