1530 lines
51 KiB
JavaScript
1530 lines
51 KiB
JavaScript
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
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"use strict";
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/**
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* Maximum file size of the font.
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*/
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var kMaxFontFileSize = 40000;
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/**
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* Maximum time to wait for a font to be loaded by @font-face
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*/
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var kMaxWaitForFontFace = 1000;
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/**
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* Useful for debugging when you want to certains operations depending on how
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* many fonts are loaded.
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*/
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var fontCount = 0;
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var fontName = "";
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/**
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* If for some reason one want to debug without fonts activated, it just need
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* to turn this pref to true/false.
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*/
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var kDisableFonts = false;
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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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var Fonts = {
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_active: null,
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get active() {
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return this._active;
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},
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set active(name) {
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this._active = this[name];
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},
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charsToUnicode: function fonts_chars2Unicode(chars) {
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var active = this._active;
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if (!active)
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return chars;
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// if we translated this string before, just grab it from the cache
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var str = active.cache[chars];
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if (str)
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return str;
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// translate the string using the font's encoding
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var encoding = active.properties.encoding;
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if (!encoding)
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return chars;
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str = "";
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for (var i = 0; i < chars.length; ++i) {
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var charcode = chars.charCodeAt(i);
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var unicode = encoding[charcode];
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// Check if the glyph has already been converted
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if (unicode instanceof Name)
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unicode = encoding[unicode] = GlyphsUnicode[unicode.name];
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// Handle surrogate pairs
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if (unicode > 0xFFFF) {
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str += String.fromCharCode(unicode & 0xFFFF);
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unicode >>= 16;
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}
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str += String.fromCharCode(unicode);
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}
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// Enter the translated string into the cache
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return active.cache[chars] = str;
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}
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};
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var FontLoader = {
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bind: function(fonts) {
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var worker = (typeof window == "undefined");
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var ready = true;
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for (var i = 0; i < fonts.length; i++) {
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var font = fonts[i];
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if (Fonts[font.name]) {
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ready = ready && !Fonts[font.name].loading;
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continue;
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}
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ready = false;
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var obj = new Font(font.name, font.file, font.properties);
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var str = "";
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var data = Fonts[font.name].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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worker ? obj.bindWorker(str) : obj.bindDOM(str);
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}
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return ready;
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}
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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.encoding = properties.encoding;
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// If the font has already been decoded simply return it
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if (Fonts[name]) {
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this.font = Fonts[name].data;
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return;
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}
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fontCount++;
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fontName = name;
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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 || kDisableFonts) {
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Fonts[name] = {
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data: file,
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loading: false,
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properties: {},
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cache: Object.create(null)
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}
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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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var cff = new CFF(name, file, properties);
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this.mimetype = "font/opentype";
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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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case "TrueType":
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this.mimetype = "font/opentype";
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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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Fonts[name] = {
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data: data,
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properties: properties,
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loading: true,
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cache: Object.create(null)
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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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return array;
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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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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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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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// numTables (2 bytes)
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header += string16(numTables);
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// searchRange (2 bytes)
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var tablesMaxPower2 = FontsUtils.getMaxPower2(numTables);
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var searchRange = tablesMaxPower2 * 16;
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header += string16(searchRange);
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// entrySelector (2 bytes)
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header += string16(Math.log(tablesMaxPower2) / Math.log(2));
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// rangeShift (2 bytes)
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header += string16(numTables * 16 - searchRange);
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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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function createTableEntry(file, offsets, tag, data) {
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// offset
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var offset = offsets.virtualOffset;
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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)
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data.push(0x00);
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while (offsets.virtualOffset & 3)
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offsets.virtualOffset++;
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// length
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var length = data.length;
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// checksum
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var checksum = tag.charCodeAt(0) +
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tag.charCodeAt(1) +
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tag.charCodeAt(2) +
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tag.charCodeAt(3) +
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offset +
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length;
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var tableEntry = tag + string32(checksum) + string32(offset) + string32(length);
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tableEntry = stringToArray(tableEntry);
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file.set(tableEntry, offsets.currentOffset);
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offsets.currentOffset += tableEntry.length;
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offsets.virtualOffset += data.length;
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};
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function getRanges(glyphs) {
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// Array.sort() sorts by characters, not numerically, so convert to an
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// array of characters.
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var codes = [];
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var length = glyphs.length;
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for (var n = 0; n < length; ++n)
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codes.push(String.fromCharCode(glyphs[n].unicode))
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codes.sort();
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// Split the sorted codes into ranges.
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var ranges = [];
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for (var n = 0; n < length; ) {
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var start = codes[n++].charCodeAt(0);
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var end = start;
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while (n < length && end + 1 == codes[n].charCodeAt(0)) {
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++end;
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++n;
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}
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ranges.push([start, end]);
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}
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return ranges;
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};
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function createCMapTable(glyphs) {
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var ranges = getRanges(glyphs);
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var headerSize = (12 * 2 + (ranges.length * 4 * 2));
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var segCount = ranges.length + 1;
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var segCount2 = segCount * 2;
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var searchRange = FontsUtils.getMaxPower2(segCount) * 2;
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var searchEntry = Math.log(segCount) / Math.log(2);
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var rangeShift = 2 * segCount - searchRange;
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var cmap = "\x00\x00" + // version
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"\x00\x01" + // numTables
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"\x00\x03" + // platformID
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"\x00\x01" + // encodingID
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"\x00\x00\x00\x0C" + // start of the table record
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"\x00\x04" + // format
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string16(headerSize) + // length
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"\x00\x00" + // languages
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string16(segCount2) +
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string16(searchRange) +
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string16(searchEntry) +
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string16(rangeShift);
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// Fill up the 4 parallel arrays describing the segments.
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var startCount = "";
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var endCount = "";
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var idDeltas = "";
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var idRangeOffsets = "";
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var glyphsIds = "";
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var bias = 0;
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for (var i = 0; i < segCount - 1; i++) {
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var range = ranges[i];
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var start = range[0];
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var end = range[1];
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var delta = (((start - 1) - bias) ^ 0xffff) + 1;
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bias += (end - start + 1);
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startCount += string16(start);
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endCount += string16(end);
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idDeltas += string16(delta);
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idRangeOffsets += string16(0);
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for (var j = 0; j < range.length; j++)
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glyphsIds += String.fromCharCode(range[j]);
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}
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startCount += "\xFF\xFF";
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endCount += "\xFF\xFF";
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idDeltas += "\x00\x01";
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idRangeOffsets += "\x00\x00";
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return stringToArray(cmap + endCount + "\x00\x00" + startCount +
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idDeltas + idRangeOffsets + glyphsIds);
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};
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function createOS2Table(properties) {
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return "\x00\x03" + // version
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"\x02\x24" + // xAvgCharWidth
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"\x01\xF4" + // usWeightClass
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"\x00\x05" + // usWidthClass
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"\x00\x00" + // fstype
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"\x02\x8A" + // ySubscriptXSize
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"\x02\xBB" + // ySubscriptYSize
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"\x00\x00" + // ySubscriptXOffset
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"\x00\x8C" + // ySubscriptYOffset
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"\x02\x8A" + // ySuperScriptXSize
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"\x02\xBB" + // ySuperScriptYSize
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"\x00\x00" + // ySuperScriptXOffset
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"\x01\xDF" + // ySuperScriptYOffset
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"\x00\x31" + // yStrikeOutSize
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"\x01\x02" + // yStrikeOutPosition
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"\x00\x00" + // sFamilyClass
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"\x02\x00\x06\x03\x00\x00\x00\x00\x00\x00" + // Panose
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"\xFF\xFF\xFF\xFF" + // ulUnicodeRange1 (Bits 0-31)
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"\xFF\xFF\xFF\xFF" + // ulUnicodeRange1 (Bits 32-63)
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"\xFF\xFF\xFF\xFF" + // ulUnicodeRange1 (Bits 64-95)
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"\xFF\xFF\xFF\xFF" + // ulUnicodeRange1 (Bits 96-127)
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"\x2A\x32\x31\x2A" + // achVendID
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"\x00\x20" + // fsSelection
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"\x00\x2D" + // usFirstCharIndex
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"\x00\x7A" + // usLastCharIndex
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"\x00\x03" + // sTypoAscender
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"\x00\x20" + // sTypeDescender
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"\x00\x38" + // sTypoLineGap
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string16(properties.ascent) + // usWinAscent
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string16(properties.descent) + // usWinDescent
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"\x00\xCE\x00\x00" + // ulCodePageRange1 (Bits 0-31)
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"\x00\x01\x00\x00" + // ulCodePageRange2 (Bits 32-63)
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string16(properties.xHeight) + // sxHeight
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string16(properties.capHeight) + // sCapHeight
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"\x00\x01" + // usDefaultChar
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"\x00\xCD" + // usBreakChar
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"\x00\x02"; // usMaxContext
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};
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function createPostTable(properties) {
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TODO("Fill with real values from the font dict");
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return "\x00\x03\x00\x00" + // Version number
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string32(properties.italicAngle) + // italicAngle
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"\x00\x00" + // underlinePosition
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"\x00\x00" + // underlineThickness
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"\x00\x00\x00\x00" + // isFixedPitch
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"\x00\x00\x00\x00" + // minMemType42
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"\x00\x00\x00\x00" + // maxMemType42
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"\x00\x00\x00\x00" + // minMemType1
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"\x00\x00\x00\x00"; // maxMemType1
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};
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constructor.prototype = {
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name: null,
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font: null,
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mimetype: null,
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encoding: null,
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checkAndRepair: function font_checkAndRepair(name, font, properties) {
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function readTableEntry(file) {
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// tag
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var tag = file.getBytes(4);
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tag = String.fromCharCode(tag[0]) +
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String.fromCharCode(tag[1]) +
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String.fromCharCode(tag[2]) +
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String.fromCharCode(tag[3]);
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var checksum = FontsUtils.bytesToInteger(file.getBytes(4));
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var offset = FontsUtils.bytesToInteger(file.getBytes(4));
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var length = FontsUtils.bytesToInteger(file.getBytes(4));
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// Read the table associated data
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var previousPosition = file.pos;
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file.pos = file.start ? file.start : 0;
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file.skip(offset);
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var data = file.getBytes(length);
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file.pos = previousPosition;
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return {
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tag: tag,
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checksum: checksum,
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length: offset,
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offset: length,
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data: data
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}
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};
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function readOpenTypeHeader(ttf) {
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return {
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version: ttf.getBytes(4),
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numTables: FontsUtils.bytesToInteger(ttf.getBytes(2)),
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searchRange: FontsUtils.bytesToInteger(ttf.getBytes(2)),
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entrySelector: FontsUtils.bytesToInteger(ttf.getBytes(2)),
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rangeShift: FontsUtils.bytesToInteger(ttf.getBytes(2))
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}
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};
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function replaceCMapTable(cmap, font, properties) {
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var version = FontsUtils.bytesToInteger(font.getBytes(2));
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var numTables = FontsUtils.bytesToInteger(font.getBytes(2));
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for (var i = 0; i < numTables; i++) {
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var platformID = FontsUtils.bytesToInteger(font.getBytes(2));
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var encodingID = FontsUtils.bytesToInteger(font.getBytes(2));
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var offset = FontsUtils.bytesToInteger(font.getBytes(4));
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var format = FontsUtils.bytesToInteger(font.getBytes(2));
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var length = FontsUtils.bytesToInteger(font.getBytes(2));
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var language = FontsUtils.bytesToInteger(font.getBytes(2));
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if ((format == 0 && numTables == 1) ||
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(format == 6 && numTables == 1 && !properties.encoding.empty)) {
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// Format 0 alone is not allowed by the sanitizer so let's rewrite
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// that to a 3-1-4 Unicode BMP table
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TODO("Use an other source of informations than charset here, it is not reliable");
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var charset = properties.charset;
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var glyphs = [];
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for (var j = 0; j < charset.length; j++) {
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glyphs.push({
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unicode: GlyphsUnicode[charset[j]] || 0
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});
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}
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cmap.data = createCMapTable(glyphs);
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} else if (format == 6 && numTables == 1) {
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// Format 6 is a 2-bytes dense mapping, which means the font data
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// lives glue together even if they are pretty far in the unicode
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// table. (This looks weird, so I can have missed something), this
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// works on Linux but seems to fails on Mac so let's rewrite the
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// cmap table to a 3-1-4 style
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var firstCode = FontsUtils.bytesToInteger(font.getBytes(2));
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var entryCount = FontsUtils.bytesToInteger(font.getBytes(2));
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var glyphs = [];
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var min = 0xffff, max = 0;
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for (var j = 0; j < entryCount; j++) {
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var charcode = FontsUtils.bytesToInteger(font.getBytes(2));
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glyphs.push(charcode);
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if (charcode < min)
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min = charcode;
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if (charcode > max)
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max = charcode;
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}
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|
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// Since Format 6 is a dense array, check for gaps
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for (var j = min; j < max; j++) {
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if (glyphs.indexOf(j) == -1)
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glyphs.push(j);
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}
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for (var j = 0; j < glyphs.length; j++)
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glyphs[j] = { unicode: glyphs[j] + firstCode };
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var ranges= getRanges(glyphs);
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assert(ranges.length == 1, "Got " + ranges.length + " ranges in a dense array");
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var encoding = properties.encoding;
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var denseRange = ranges[0];
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var start = denseRange[0];
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var end = denseRange[1];
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var index = firstCode;
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for (var j = start; j <= end; j++)
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encoding[index++] = glyphs[j - firstCode - 1].unicode;
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cmap.data = createCMapTable(glyphs);
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}
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}
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};
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|
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// Check that required tables are present
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|
var requiredTables = [ "OS/2", "cmap", "head", "hhea",
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"hmtx", "maxp", "name", "post" ];
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|
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var header = readOpenTypeHeader(font);
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var numTables = header.numTables;
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// This keep a reference to the CMap and the post tables since they can
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// be rewritted
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var cmap, post;
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|
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var tables = [];
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for (var i = 0; i < numTables; i++) {
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var table = readTableEntry(font);
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var index = requiredTables.indexOf(table.tag);
|
|
if (index != -1) {
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if (table.tag == "cmap")
|
|
cmap = table;
|
|
else if (table.tag == "post")
|
|
post = 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
|
|
replaceCMapTable(cmap, font, properties);
|
|
|
|
// Rewrite the 'post' table if needed
|
|
if (!post) {
|
|
tables.push({
|
|
tag: "post",
|
|
data: stringToArray(createPostTable(properties))
|
|
});
|
|
}
|
|
|
|
// Tables needs to be written by ascendant alphabetic order
|
|
tables.sort(function tables_sort(a, b) {
|
|
return 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) {
|
|
var otf = new Uint8Array(kMaxFontFileSize);
|
|
|
|
function createNameTable(name) {
|
|
var names = [
|
|
"See original licence", // Copyright
|
|
fontName, // Font family
|
|
"undefined", // Font subfamily (font weight)
|
|
"uniqueID", // Unique ID
|
|
fontName, // Full font name
|
|
"0.1", // Version
|
|
"undefined", // Postscript name
|
|
"undefined", // Trademark
|
|
"undefined", // Manufacturer
|
|
"undefined" // Designer
|
|
];
|
|
|
|
var nameTable =
|
|
"\x00\x00" + // format
|
|
"\x00\x0A" + // Number of names Record
|
|
"\x00\x7E"; // Storage
|
|
|
|
// Build the name records field
|
|
var strOffset = 0;
|
|
for (var i = 0; i < names.length; i++) {
|
|
var str = names[i];
|
|
|
|
var nameRecord =
|
|
"\x00\x01" + // platform ID
|
|
"\x00\x00" + // encoding ID
|
|
"\x00\x00" + // language ID
|
|
"\x00\x00" + // name ID
|
|
string16(str.length) +
|
|
string16(strOffset);
|
|
nameTable += nameRecord;
|
|
|
|
strOffset += str.length;
|
|
}
|
|
|
|
nameTable += names.join("");
|
|
return nameTable;
|
|
}
|
|
|
|
// Required Tables
|
|
var CFF =
|
|
font.data, // PostScript Font Program
|
|
OS2, // OS/2 and Windows Specific metrics
|
|
cmap, // Character to glyphs mapping
|
|
head, // Font header
|
|
hhea, // Horizontal header
|
|
hmtx, // Horizontal metrics
|
|
maxp, // Maximum profile
|
|
name, // Naming tables
|
|
post; // PostScript informations
|
|
var tables = [CFF, OS2, cmap, head, hhea, hmtx, maxp, name, post];
|
|
|
|
// 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 offsets = {
|
|
currentOffset: 0,
|
|
virtualOffset: tables.length * (4 * 4)
|
|
};
|
|
|
|
// It there is only one font, offset table is the first bytes of the file
|
|
createOpenTypeHeader("\x4F\x54\x54\x4F", otf, offsets, tables.length);
|
|
|
|
/** CFF */
|
|
createTableEntry(otf, offsets, "CFF ", CFF);
|
|
|
|
/** OS/2 */
|
|
OS2 = stringToArray(createOS2Table(properties));
|
|
createTableEntry(otf, offsets, "OS/2", OS2);
|
|
|
|
/** CMAP */
|
|
var charstrings = font.charstrings;
|
|
cmap = createCMapTable(charstrings);
|
|
createTableEntry(otf, offsets, "cmap", cmap);
|
|
|
|
/** HEAD */
|
|
head = stringToArray(
|
|
"\x00\x01\x00\x00" + // Version number
|
|
"\x00\x00\x50\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\x00\x00\x00\x00" + // creation date
|
|
"\x00\x00\x00\x00\x00\x00\x00\x00" + // modifification date
|
|
"\x00\x00" + // xMin
|
|
"\x00\x00" + // yMin
|
|
"\x00\x00" + // xMax
|
|
"\x00\x00" + // yMax
|
|
"\x00\x00" + // macStyle
|
|
"\x00\x00" + // lowestRecPPEM
|
|
"\x00\x00" + // fontDirectionHint
|
|
"\x00\x00" + // indexToLocFormat
|
|
"\x00\x00" // glyphDataFormat
|
|
);
|
|
createTableEntry(otf, offsets, "head", head);
|
|
|
|
/** HHEA */
|
|
hhea = stringToArray(
|
|
"\x00\x01\x00\x00" + // Version number
|
|
"\x00\x00" + // Typographic Ascent
|
|
"\x00\x00" + // Typographic Descent
|
|
"\x00\x00" + // Line Gap
|
|
"\xFF\xFF" + // advanceWidthMax
|
|
"\x00\x00" + // minLeftSidebearing
|
|
"\x00\x00" + // minRightSidebearing
|
|
"\x00\x00" + // xMaxExtent
|
|
"\x00\x00" + // caretSlopeRise
|
|
"\x00\x00" + // caretSlopeRun
|
|
"\x00\x00" + // caretOffset
|
|
"\x00\x00" + // -reserved-
|
|
"\x00\x00" + // -reserved-
|
|
"\x00\x00" + // -reserved-
|
|
"\x00\x00" + // -reserved-
|
|
"\x00\x00" + // metricDataFormat
|
|
string16(charstrings.length)
|
|
);
|
|
createTableEntry(otf, offsets, "hhea", hhea);
|
|
|
|
/** HMTX */
|
|
/* For some reasons, probably related to how the backend handle fonts,
|
|
* Linux seems to ignore this file and prefer the data from the CFF itself
|
|
* while Windows use this data. So be careful if you hack on Linux and
|
|
* have to touch the 'hmtx' table
|
|
*/
|
|
hmtx = "\x01\xF4\x00\x00"; // Fake .notdef
|
|
var width = 0, lsb = 0;
|
|
for (var i = 0; i < charstrings.length; i++) {
|
|
width = charstrings[i].charstring[1];
|
|
hmtx += string16(width) + string16(lsb);
|
|
}
|
|
hmtx = stringToArray(hmtx);
|
|
createTableEntry(otf, offsets, "hmtx", hmtx);
|
|
|
|
/** MAXP */
|
|
maxp = "\x00\x00\x50\x00" + // Version number
|
|
string16(charstrings.length + 1); // Num of glyphs (+1 to pass the sanitizer...)
|
|
maxp = stringToArray(maxp);
|
|
createTableEntry(otf, offsets, "maxp", maxp);
|
|
|
|
/** NAME */
|
|
name = stringToArray(createNameTable(name));
|
|
createTableEntry(otf, offsets, "name", name);
|
|
|
|
/** POST */
|
|
post = stringToArray(createPostTable(properties));
|
|
createTableEntry(otf, offsets, "post", post);
|
|
|
|
// Once all the table entries header are written, dump the data!
|
|
var tables = [CFF, OS2, cmap, head, hhea, hmtx, maxp, name, post];
|
|
for (var i = 0; i < tables.length; i++) {
|
|
var table = tables[i];
|
|
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.name,
|
|
mimetype: this.mimetype
|
|
}
|
|
});
|
|
},
|
|
|
|
bindDOM: function font_bindDom(data) {
|
|
var fontName = this.name;
|
|
|
|
/** Hack begin */
|
|
// Actually there is not event when a font has finished downloading so
|
|
// the following code are a dirty hack to 'guess' when a font is ready
|
|
// This code could go away when bug 471915 has landed
|
|
var canvas = document.createElement("canvas");
|
|
var ctx = canvas.getContext("2d");
|
|
ctx.font = "bold italic 20px " + fontName + ", Symbol, Arial";
|
|
var testString = " ";
|
|
|
|
// Periodicaly check for the width of the testString, it will be
|
|
// different once the real font has loaded
|
|
var textWidth = ctx.measureText(testString).width;
|
|
|
|
var interval = window.setInterval(function canvasInterval(self) {
|
|
this.start = this.start || Date.now();
|
|
ctx.font = "bold italic 20px " + fontName + ", Symbol, Arial";
|
|
|
|
// For some reasons the font has not loaded, so mark it loaded for the
|
|
// page to proceed but cry
|
|
if ((Date.now() - this.start) >= kMaxWaitForFontFace) {
|
|
window.clearInterval(interval);
|
|
Fonts[fontName].loading = false;
|
|
warn("Is " + fontName + " loaded?");
|
|
this.start = 0;
|
|
} else if (textWidth != ctx.measureText(testString).width) {
|
|
window.clearInterval(interval);
|
|
Fonts[fontName].loading = false;
|
|
this.start = 0;
|
|
}
|
|
}, 30, this);
|
|
|
|
/** Hack end */
|
|
|
|
// 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.length);
|
|
}
|
|
};
|
|
|
|
return constructor;
|
|
})();
|
|
|
|
|
|
/**
|
|
* FontsUtils is a static class dedicated to hold codes that are not related
|
|
* to fonts in particular and needs to be share between them.
|
|
*/
|
|
var FontsUtils = {
|
|
_bytesArray: new Uint8Array(4),
|
|
integerToBytes: function fu_integerToBytes(value, bytesCount) {
|
|
var bytes = this._bytesArray;
|
|
|
|
if (bytesCount == 1) {
|
|
bytes.set([value]);
|
|
return bytes[0];
|
|
} else if (bytesCount == 2) {
|
|
bytes.set([value >> 8, value]);
|
|
return [bytes[0], bytes[1]];
|
|
} else if (bytesCount == 4) {
|
|
bytes.set([value >> 24, value >> 16, value >> 8, value]);
|
|
return [bytes[0], bytes[1], bytes[2], bytes[3]];
|
|
}
|
|
|
|
error("This number of bytes " + bytesCount + " is not supported");
|
|
return null;
|
|
},
|
|
|
|
bytesToInteger: function fu_bytesToInteger(bytesArray) {
|
|
var value = 0;
|
|
for (var i = 0; i < bytesArray.length; i++)
|
|
value = (value << 8) + bytesArray[i];
|
|
return value;
|
|
},
|
|
|
|
getMaxPower2: function fu_getMaxPower2(number) {
|
|
var maxPower = 0;
|
|
var value = number;
|
|
while (value >= 2) {
|
|
value /= 2;
|
|
maxPower++;
|
|
}
|
|
|
|
value = 2;
|
|
for (var i = 1; i < maxPower; i++)
|
|
value *= 2;
|
|
return value;
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* 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.
|
|
// TODO When decodeCharstring encounter such a command it should
|
|
// directly do:
|
|
// - pop the previous charstring[] command into 'index'
|
|
// - pop the previous charstring[] command and ignore it, it is
|
|
// normally the number of element to push on the stack before
|
|
// the command but since everything will be pushed on the stack
|
|
// by the PS interpreter when it will read them that is safe to
|
|
// ignore this command
|
|
// - push the content of the OtherSubrs[index] inside charstring[]
|
|
"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"
|
|
};
|
|
|
|
function decodeCharString(array) {
|
|
var charString = [];
|
|
|
|
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 == 12) {
|
|
var escape = array[++i];
|
|
command = charStringDictionary["12"][escape];
|
|
} else {
|
|
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 {
|
|
var byte = array[++i];
|
|
var high = (byte >> 1);
|
|
value = (byte - high) << 24 | array[++i] << 16 |
|
|
array[++i] << 8 | array[++i];
|
|
}
|
|
|
|
charString.push(value);
|
|
}
|
|
|
|
return charString;
|
|
};
|
|
|
|
/**
|
|
* Returns an object containing a Subrs array and a CharStrings array
|
|
* extracted from and eexec encrypted block of data
|
|
*/
|
|
this.extractFontProgram = function t1_extractFontProgram(stream) {
|
|
var eexecString = decrypt(stream, kEexecEncryptionKey, 4);
|
|
var subrs = [], glyphs = [];
|
|
var inGlyphs = false;
|
|
var inSubrs = false;
|
|
var glyph = "";
|
|
|
|
var token = "";
|
|
var index = 0;
|
|
var length = 0;
|
|
|
|
var c = "";
|
|
var count = eexecString.length;
|
|
for (var i = 0; i < count; i++) {
|
|
var c = eexecString[i];
|
|
|
|
if (inSubrs && c == 0x52) {
|
|
length = parseInt(length);
|
|
var data = eexecString.slice(i + 3, i + 3 + length);
|
|
var encodedSubr = decrypt(data, kCharStringsEncryptionKey, 4);
|
|
var subr = decodeCharString(encodedSubr);
|
|
|
|
subrs.push(subr);
|
|
i += 3 + length;
|
|
} else if (inGlyphs && c == 0x52) {
|
|
length = parseInt(length);
|
|
var data = eexecString.slice(i + 3, i + 3 + length);
|
|
var encodedCharstring = decrypt(data, kCharStringsEncryptionKey, 4);
|
|
var subr = decodeCharString(encodedCharstring);
|
|
|
|
glyphs.push({
|
|
glyph: glyph,
|
|
data: subr
|
|
});
|
|
i += 3 + length;
|
|
} else if (inGlyphs && c == 0x2F) {
|
|
token = "";
|
|
glyph = "";
|
|
|
|
while ((c = eexecString[++i]) != 0x20)
|
|
glyph += String.fromCharCode(c);
|
|
} else if (!inSubrs && !inGlyphs && c == 0x2F && eexecString[i+1] == 0x53) {
|
|
while ((c = eexecString[++i]) != 0x20) {};
|
|
inSubrs = true;
|
|
} else if (c == 0x20) {
|
|
index = length;
|
|
length = token;
|
|
token = "";
|
|
} else if (c == 0x2F && eexecString[i+1] == 0x43 && eexecString[i+2] == 0x68) {
|
|
while ((c = eexecString[++i]) != 0x20) {};
|
|
inSubrs = false;
|
|
inGlyphs = true;
|
|
} else {
|
|
token += String.fromCharCode(c);
|
|
}
|
|
}
|
|
return {
|
|
subrs: subrs,
|
|
charstrings: glyphs
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* 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");
|
|
file.skip(length1);
|
|
var eexecBlock = file.getBytes(length2);
|
|
|
|
// Decrypt the data blocks and retrieve it's content
|
|
var data = type1Parser.extractFontProgram(eexecBlock);
|
|
|
|
this.charstrings = this.getOrderedCharStrings(data.charstrings);
|
|
this.data = this.wrap(name, this.charstrings, data.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 [0x00, 0x00, 0x00];
|
|
|
|
var data = [];
|
|
var bytes = FontsUtils.integerToBytes(count, 2);
|
|
for (var i = 0; i < bytes.length; i++)
|
|
data.push(bytes[i]);
|
|
|
|
// 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.push(0x04);
|
|
|
|
// Add another offset after this one because we need a new offset
|
|
var relativeOffset = 1;
|
|
for (var i = 0; i < count + 1; i++) {
|
|
var bytes = FontsUtils.integerToBytes(relativeOffset, 4);
|
|
for (var j = 0; j < bytes.length; j++)
|
|
data.push(bytes[j]);
|
|
|
|
if (objects[i])
|
|
relativeOffset += objects[i].length;
|
|
}
|
|
|
|
for (var i =0; i < count; i++) {
|
|
for (var j = 0; j < objects[i].length; j++)
|
|
data.push(isByte ? objects[i][j] : objects[i].charCodeAt(j));
|
|
}
|
|
return data;
|
|
},
|
|
|
|
encodeNumber: function cff_encodeNumber(value) {
|
|
var x = 0;
|
|
if (value >= -32768 && value <= 32767) {
|
|
return [ 28, value >> 8, value & 0xFF ];
|
|
} else if (value >= (-2147483647-1) && value <= 2147483647) {
|
|
return [ 0xFF, value >> 24, Value >> 16, value >> 8, 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].glyph;
|
|
var unicode = GlyphsUnicode[glyph];
|
|
if (!unicode) {
|
|
if (glyph != ".notdef")
|
|
warn(glyph + " does not have an entry in the glyphs unicode dictionary");
|
|
} else {
|
|
charstrings.push({
|
|
glyph: glyph,
|
|
unicode: unicode,
|
|
charstring: glyphs[i].data
|
|
});
|
|
}
|
|
};
|
|
|
|
charstrings.sort(function charstrings_sort(a, b) {
|
|
return a.unicode > b.unicode;
|
|
});
|
|
return charstrings;
|
|
},
|
|
|
|
/*
|
|
* Flatten the commands by interpreting the postscript code and replacing
|
|
* every 'callsubr', 'callothersubr' by the real commands.
|
|
*
|
|
* TODO This function also do a string to command number transformation
|
|
* that can probably be avoided if the Type1 decodeCharstring code is smarter
|
|
*/
|
|
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) {
|
|
var i = 0;
|
|
while (true) {
|
|
var obj = charstring[i];
|
|
if (obj == null)
|
|
return [];
|
|
|
|
if (obj.charAt) {
|
|
switch (obj) {
|
|
case "callothersubr":
|
|
var index = charstring[i - 1];
|
|
var count = charstring[i - 2];
|
|
var data = charstring[i - 3];
|
|
|
|
// 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) {
|
|
i -= 3;
|
|
continue;
|
|
}
|
|
|
|
// This is the same things about hint replacment, if it is not used
|
|
// entry 3 can be replaced by {}
|
|
if (index == 3) {
|
|
if (!data) {
|
|
charstring.splice(i - 2, 4, 3);
|
|
i -= 3;
|
|
} else {
|
|
// 5 to remove the arguments, the callothersubr call and the pop command
|
|
charstring.splice(i - 3, 5, 3);
|
|
i -= 3;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case "hsbw":
|
|
var charWidthVector = charstring[1];
|
|
var leftSidebearing = charstring[0];
|
|
|
|
charstring.splice(i, 1, leftSidebearing, "hmoveto");
|
|
charstring.splice(0, 1);
|
|
break;
|
|
|
|
case "endchar":
|
|
case "return":
|
|
// CharString is ready to be re-encode to commands number at this point
|
|
for (var j = 0; j < charstring.length; j++) {
|
|
var command = charstring[j];
|
|
if (parseFloat(command) == command) {
|
|
charstring.splice(j, 1, 28, command >> 8, command);
|
|
j+= 2;
|
|
} else if (command.charAt) {
|
|
var cmd = this.commandsMap[command];
|
|
if (!cmd)
|
|
error(command);
|
|
|
|
if (IsArray(cmd)) {
|
|
charstring.splice(j, 1, cmd[0], cmd[1]);
|
|
j += 1;
|
|
} else {
|
|
charstring[j] = cmd;
|
|
}
|
|
}
|
|
}
|
|
return charstring;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
i++;
|
|
}
|
|
error("failing with i = " + i + " in charstring:" + charstring + "(" + charstring.length + ")");
|
|
return [];
|
|
},
|
|
|
|
wrap: function wrap(name, charstrings, subrs, properties) {
|
|
// Starts the conversion of the Type1 charstrings to Type2
|
|
var glyphs = [];
|
|
var glyphsCount = charstrings.length;
|
|
for (var i = 0; i < glyphsCount; i++) {
|
|
var charstring = charstrings[i].charstring;
|
|
glyphs.push(this.flattenCharstring(charstring.slice()));
|
|
}
|
|
|
|
// Create a CFF font data
|
|
var cff = new Uint8Array(kMaxFontFileSize);
|
|
var currentOffset = 0;
|
|
|
|
// Font header (major version, minor version, header size, offset size)
|
|
var header = [0x01, 0x00, 0x04, 0x04];
|
|
currentOffset += header.length;
|
|
cff.set(header);
|
|
|
|
// Names Index
|
|
var nameIndex = this.createCFFIndexHeader([name]);
|
|
cff.set(nameIndex, currentOffset);
|
|
currentOffset += nameIndex.length;
|
|
|
|
// Calculate strings before writing the TopDICT index in order
|
|
// to calculate correct relative offsets for storing 'charset'
|
|
// and 'charstrings' data
|
|
var version = "";
|
|
var notice = "";
|
|
var fullName = "";
|
|
var familyName = "";
|
|
var weight = "";
|
|
var strings = [version, notice, fullName,
|
|
familyName, weight];
|
|
var stringsIndex = this.createCFFIndexHeader(strings);
|
|
var stringsDataLength = stringsIndex.length;
|
|
|
|
// Create the global subroutines index
|
|
var globalSubrsIndex = this.createCFFIndexHeader([]);
|
|
|
|
// Fill the charset header (first byte is the encoding)
|
|
var charset = [0x00];
|
|
for (var i = 0; i < glyphsCount; i++) {
|
|
var index = CFFStrings.indexOf(charstrings[i].glyph);
|
|
if (index == -1)
|
|
index = CFFStrings.length + strings.indexOf(charstrings[i].glyph);
|
|
var bytes = FontsUtils.integerToBytes(index, 2);
|
|
charset.push(bytes[0]);
|
|
charset.push(bytes[1]);
|
|
}
|
|
|
|
var charstringsIndex = this.createCFFIndexHeader([[0x40, 0x0E]].concat(glyphs), true);
|
|
|
|
//Top Dict Index
|
|
var topDictIndex = [
|
|
0x00, 0x01, 0x01, 0x01, 0x30,
|
|
248, 27, 0, // version
|
|
248, 28, 1, // Notice
|
|
248, 29, 2, // FullName
|
|
248, 30, 3, // FamilyName
|
|
248, 31, 4 // Weight
|
|
];
|
|
|
|
var fontBBox = properties.bbox;
|
|
for (var i = 0; i < fontBBox.length; i++)
|
|
topDictIndex = topDictIndex.concat(this.encodeNumber(fontBBox[i]));
|
|
topDictIndex.push(5) // FontBBox;
|
|
|
|
var charsetOffset = currentOffset +
|
|
(topDictIndex.length + (4 + 4 + 4 + 7)) +
|
|
stringsIndex.length +
|
|
globalSubrsIndex.length;
|
|
topDictIndex = topDictIndex.concat(this.encodeNumber(charsetOffset));
|
|
topDictIndex.push(15); // charset
|
|
|
|
topDictIndex = topDictIndex.concat([28, 0, 0, 16]) // Encoding
|
|
|
|
var charstringsOffset = charsetOffset + (glyphsCount * 2) + 1;
|
|
topDictIndex = topDictIndex.concat(this.encodeNumber(charstringsOffset));
|
|
topDictIndex.push(17); // charstrings
|
|
|
|
topDictIndex = topDictIndex.concat([28, 0, 55])
|
|
var privateOffset = charstringsOffset + charstringsIndex.length;
|
|
topDictIndex = topDictIndex.concat(this.encodeNumber(privateOffset));
|
|
topDictIndex.push(18); // Private
|
|
|
|
var indexes = [
|
|
topDictIndex, stringsIndex,
|
|
globalSubrsIndex, charset,
|
|
charstringsIndex
|
|
];
|
|
|
|
for (var i = 0; i < indexes.length; i++) {
|
|
var index = indexes[i];
|
|
cff.set(index, currentOffset);
|
|
currentOffset += index.length;
|
|
}
|
|
|
|
// Private Data
|
|
var defaultWidth = this.encodeNumber(0);
|
|
var privateData = [].concat(
|
|
defaultWidth, [20],
|
|
[139, 21], // nominalWidth
|
|
[
|
|
119, 159, 248, 97, 159, 247, 87, 159, 6,
|
|
30, 10, 3, 150, 37, 255, 12, 9,
|
|
139, 12,
|
|
10, 172, 10,
|
|
172, 150, 143, 146, 150, 146, 12, 12,
|
|
247, 32, 11,
|
|
247, 10, 161, 147, 154, 150, 143, 12, 13,
|
|
139, 12, 14,
|
|
28, 0, 55, 19 // Subrs offset
|
|
]);
|
|
cff.set(privateData, currentOffset);
|
|
currentOffset += privateData.length;
|
|
|
|
// Local Subrs
|
|
var flattenedSubrs = [];
|
|
|
|
var bias = 0;
|
|
var subrsCount = subrs.length;
|
|
if (subrsCount < 1240)
|
|
bias = 107;
|
|
else if (subrsCount < 33900)
|
|
bias = 1131;
|
|
else
|
|
bias = 32768;
|
|
|
|
// Add a bunch of empty subrs to deal with the Type2 bias
|
|
for (var i = 0; i < bias; i++)
|
|
flattenedSubrs.push([0x0B]);
|
|
|
|
for (var i = 0; i < subrsCount; i++) {
|
|
var subr = subrs[i];
|
|
flattenedSubrs.push(this.flattenCharstring(subr));
|
|
}
|
|
|
|
var subrsData = this.createCFFIndexHeader(flattenedSubrs, true);
|
|
cff.set(subrsData, currentOffset);
|
|
currentOffset += subrsData.length;
|
|
|
|
var fontData = [];
|
|
for (var i = 0; i < currentOffset; i++)
|
|
fontData.push(cff[i]);
|
|
|
|
return fontData;
|
|
}
|
|
};
|
|
|