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1606 lines
49 KiB
1606 lines
49 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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|
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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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/** |
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* Maximum number of glyphs per font. |
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*/ |
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var kMaxGlyphsCount = 65526; |
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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 |
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*/ |
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var kMaxWaitForFontFace = 2000; |
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|
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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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|
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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(aFontName) { |
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this._active = this[aFontName]; |
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}, |
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unicodeFromCode: function fonts_unicodeFromCode(aCode) { |
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var active = this._active; |
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if (!active) |
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return aCode; |
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var difference = active.encoding[aCode]; |
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var unicode = GlyphsUnicode[difference]; |
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return unicode ? "0x" + unicode : aCode; |
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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", binaryData, aFontEncoding, "Type1"); |
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* type1Font.bind(); |
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* |
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* As an improvment the last parameter can be replaced by an automatic guess |
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* of the font type based on the first byte of the file. |
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*/ |
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var Font = function(aName, aFile, aEncoding, aType) { |
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this.name = aName; |
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|
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// If the font has already been decoded simply return |
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if (Fonts[aName]) { |
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this.font = Fonts[aName].data; |
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return; |
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} |
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fontCount++; |
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var start = Date.now(); |
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switch (aType) { |
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case "Type1": |
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var cff = new CFF(aFile); |
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this.mimetype = "font/otf"; |
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|
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// Wrap the CFF data inside an OTF font file |
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this.font = this.cover(cff); |
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break; |
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case "TrueType": |
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this.mimetype = "font/ttf"; |
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var ttf = new TrueType(aFile); |
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this.font = ttf.data; |
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break; |
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default: |
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warn("Font " + aType + " is not supported"); |
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break; |
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} |
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var end = Date.now(); |
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Fonts[aName] = { |
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data: this.font, |
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encoding: aEncoding, |
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loading: true |
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} |
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|
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// Attach the font to the document |
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this.bind(); |
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}; |
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Font.prototype = { |
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name: null, |
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font: null, |
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mimetype: null, |
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bind: function font_bind() { |
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var data = this.font; |
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|
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// Compute the binary data to base 64 |
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var str = []; |
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var count = data.length; |
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for (var i = 0; i < count; i++) |
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str.push(data.getChar ? data.getChar() |
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: String.fromCharCode(data[i])); |
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|
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var dataBase64 = window.btoa(str.join("")); |
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var fontName = this.name; |
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/** Hack begin */ |
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// Actually there is not event when a font has finished downloading so |
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// the following tons of code are a dirty hack to 'guess' when a font is |
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// ready |
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var debug = false; |
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|
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var canvas = document.createElement("canvas"); |
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var style = "position:absolute; top: " + |
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(debug ? (80 * fontCount) : "-200") + "px; left: 100px;"; |
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canvas.setAttribute("style", style); |
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canvas.setAttribute("width", 100); |
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canvas.setAttribute("heigth", 70); |
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document.body.appendChild(canvas); |
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|
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// Get the first character of the font |
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var page = pdfDocument.getPage(pageNum); |
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var xref = page.xref; |
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var resources = xref.fetchIfRef(page.resources); |
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var fontResource = resources.get("Font"); |
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var charset = ""; |
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for (var id in fontResource.map) { |
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var res = xref.fetch(fontResource.get(id)); |
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var descriptor = xref.fetch(res.get("FontDescriptor")); |
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var name = descriptor.get("FontName").toString(); |
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var font = Fonts[name.replace("+", "_")]; |
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if (font && font.loading && name == fontName.replace("_", "+")) { |
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charset = descriptor.get("CharSet").split("/"); |
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break; |
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} |
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} |
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|
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// Warn if the charset is not found, this is likely a bug! |
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var testCharset = charset; |
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if (!charset) { |
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warn("No charset found for: " + fontName); |
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} else { |
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// if the charset is too small make it repeat a few times |
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var count = 30; |
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while (count-- && testCharset.length <= 30) |
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testCharset = testCharset.concat(charset.slice()); |
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} |
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|
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// Get the font size canvas think it will be |
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var ctx = canvas.getContext("2d"); |
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var testString = ""; |
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for (var i = 0; i < testCharset.length; i++) { |
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var unicode = new Number("0x" + GlyphsUnicode[testCharset[i]]); |
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if (!unicode) |
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error("Unicode for " + testCharset[i] + " is has not been found in the glyphs list"); |
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testString += String.fromCharCode(unicode); |
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} |
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ctx.font = "20px " + fontName + ", Symbol"; |
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var textWidth = ctx.mozMeasureText(testString); |
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if (debug) |
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ctx.fillText(testString, 20, 20); |
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var start = Date.now(); |
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var interval = window.setInterval(function(self) { |
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ctx.font = "20px " + fontName + ", Symbol"; |
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// For some reasons the font has not loaded, so mark it loaded for the |
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// page to proceed but cry |
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if ((Date.now() - start) >= kMaxWaitForFontFace) { |
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window.clearInterval(interval); |
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Fonts[fontName].loading = false; |
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warn("Is " + fontName + " for charset: " + charset + " loaded?"); |
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} else if (textWidth != ctx.mozMeasureText(testString)) { |
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window.clearInterval(interval); |
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Fonts[fontName].loading = false; |
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} |
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if (debug) |
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ctx.fillText(testString, 20, 50); |
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}, 150, this); |
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/** Hack end */ |
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// Add the @font-face rule to the document |
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var url = "url(data:" + this.mimetype + ";base64," + dataBase64 + ");"; |
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var rule = "@font-face { font-family:'" + fontName + "';src:" + url + "}"; |
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var styleSheet = document.styleSheets[0]; |
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styleSheet.insertRule(rule, styleSheet.length); |
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}, |
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_createOpenTypeHeader: function font_createOpenTypeHeader(aFile, aOffsets, aNumTables) { |
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// sfnt version (4 bytes) |
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var version = [0x4F, 0x54, 0x54, 0X4F]; |
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// numTables (2 bytes) |
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var numTables = aNumTables; |
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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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// entrySelector (2 bytes) |
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var entrySelector = Math.log(tablesMaxPower2) / Math.log(2); |
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// rangeShift (2 bytes) |
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var rangeShift = numTables * 16 - searchRange; |
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var header = [].concat(version, |
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FontsUtils.integerToBytes(numTables, 2), |
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FontsUtils.integerToBytes(searchRange, 2), |
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FontsUtils.integerToBytes(entrySelector, 2), |
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FontsUtils.integerToBytes(rangeShift, 2)); |
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aFile.set(header, aOffsets.currentOffset); |
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aOffsets.currentOffset += header.length; |
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aOffsets.virtualOffset += header.length; |
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}, |
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_createTableEntry: function font_createTableEntry(aFile, aOffsets, aTag, aData) { |
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// tag |
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var tag = [ |
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aTag.charCodeAt(0), |
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aTag.charCodeAt(1), |
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aTag.charCodeAt(2), |
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aTag.charCodeAt(3) |
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]; |
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// offset |
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var offset = aOffsets.virtualOffset; |
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// Per spec tables must be 4-bytes align so add some 0x00 if needed |
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while (aData.length & 3) |
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aData.push(0x00); |
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// length |
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var length = aData.length; |
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// checksum |
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var checksum = FontsUtils.bytesToInteger(tag) + offset + length; |
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|
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var tableEntry = [].concat(tag, |
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FontsUtils.integerToBytes(checksum, 4), |
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FontsUtils.integerToBytes(offset, 4), |
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FontsUtils.integerToBytes(length, 4)); |
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aFile.set(tableEntry, aOffsets.currentOffset); |
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aOffsets.currentOffset += tableEntry.length; |
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aOffsets.virtualOffset += aData.length; |
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}, |
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_createCMAPTable: function font_createCMAPTable(aGlyphs) { |
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var characters = new Array(kMaxGlyphsCount); |
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for (var i = 0; i < aGlyphs.length; i++) { |
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characters[aGlyphs[i].unicode] = i + 1; |
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} |
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// Separate the glyphs into continuous range of codes, aka segment. |
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var ranges = []; |
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var range = []; |
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for (var i = 0; i < characters.length; i++) { |
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if (characters[i]) { |
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range.push(i); |
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} else if (range.length) { |
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ranges.push(range.slice()); |
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range = []; |
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} |
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} |
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// The size in bytes of the header is equal to the size of the |
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// different fields * length of a short + (size of the 4 parallels arrays |
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// describing segments * length of a short). |
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var headerSize = (12 * 2 + (ranges.length * 4 * 2)); |
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|
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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 = [].concat( |
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[ |
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0x00, 0x00, // version |
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0x00, 0x01, // numTables |
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0x00, 0x03, // platformID |
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0x00, 0x01, // encodingID |
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0x00, 0x00, 0x00, 0x0C, // start of the table record |
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0x00, 0x04 // format |
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], |
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FontsUtils.integerToBytes(headerSize, 2), // length |
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[0x00, 0x00], // language |
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FontsUtils.integerToBytes(segCount2, 2), |
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FontsUtils.integerToBytes(searchRange, 2), |
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FontsUtils.integerToBytes(searchEntry, 2), |
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FontsUtils.integerToBytes(rangeShift, 2) |
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); |
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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 glyphsIdsArray = []; |
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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 = FontsUtils.integerToBytes(range[0], 2); |
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var end = FontsUtils.integerToBytes(range[range.length - 1], 2); |
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|
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var delta = FontsUtils.integerToBytes(((range[0] - 1) - bias) % 65536, 2); |
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bias += range.length; |
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// deltas are signed shorts |
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delta[0] ^= 0xFF; |
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delta[1] ^= 0xFF; |
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delta[1] += 1; |
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startCount.push(start[0], start[1]); |
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endCount.push(end[0], end[1]); |
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idDeltas.push(delta[0], delta[1]); |
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idRangeOffsets.push(0x00, 0x00); |
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for (var j = 0; j < range.length; j++) |
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glyphsIdsArray.push(range[j]); |
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} |
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startCount.push(0xFF, 0xFF); |
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endCount.push(0xFF, 0xFF); |
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idDeltas.push(0x00, 0x01); |
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idRangeOffsets.push(0x00, 0x00); |
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|
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return cmap.concat(endCount, [0x00, 0x00], startCount, |
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idDeltas, idRangeOffsets, glyphsIdsArray); |
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}, |
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cover: function font_cover(aFont) { |
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var otf = new Uint8Array(kMaxFontFileSize); |
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// Required Tables |
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var CFF = aFont.data, // PostScript Font Program |
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OS2 = [], // OS/2 and Windows Specific metrics |
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cmap = [], // Character to glyphs mapping |
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head = [], // Font eader |
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hhea = [], // Horizontal header |
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hmtx = [], // Horizontal metrics |
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maxp = [], // Maximum profile |
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name = [], // Naming tables |
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post = []; // PostScript informations |
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var tables = [CFF, OS2, cmap, head, hhea, hmtx, maxp, name, post]; |
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|
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// The offsets object holds at the same time a representation of where |
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// to write the table entry information about a table and another offset |
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// representing the offset where to draw the actual data of a particular |
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// table |
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var offsets = { |
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currentOffset: 0, |
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virtualOffset: tables.length * (4 * 4) |
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}; |
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|
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// For files with only one font the offset table is the first thing of the |
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// file |
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this._createOpenTypeHeader(otf, offsets, tables.length); |
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|
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// XXX It is probable that in a future we want to get rid of this glue |
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// between the CFF and the OTF format in order to be able to embed TrueType |
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// data. |
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this._createTableEntry(otf, offsets, "CFF ", CFF); |
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|
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/** OS/2 */ |
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OS2 = [ |
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0x00, 0x03, // version |
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0x02, 0x24, // xAvgCharWidth |
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0x01, 0xF4, // usWeightClass |
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0x00, 0x05, // usWidthClass |
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0x00, 0x00, // fstype |
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0x02, 0x8A, // ySubscriptXSize |
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0x02, 0xBB, // ySubscriptYSize |
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0x00, 0x00, // ySubscriptXOffset |
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0x00, 0x8C, // ySubscriptYOffset |
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0x02, 0x8A, // ySuperScriptXSize |
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0x02, 0xBB, // ySuperScriptYSize |
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0x00, 0x00, // ySuperScriptXOffset |
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0x01, 0xDF, // ySuperScriptYOffset |
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0x00, 0x31, // yStrikeOutSize |
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0x01, 0x02, // yStrikeOutPosition |
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0x00, 0x00, // sFamilyClass |
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0x02, 0x00, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Panose |
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0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 0-31) |
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0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 32-63) |
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0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 64-95) |
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0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 96-127) |
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0x2A, 0x32, 0x31, 0x2A, // achVendID |
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0x00, 0x20, // fsSelection |
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0x00, 0x2D, // usFirstCharIndex |
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0x00, 0x7A, // usLastCharIndex |
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0x00, 0x03, // sTypoAscender |
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0x00, 0x20, // sTypeDescender |
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0x00, 0x38, // sTypoLineGap |
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0x00, 0x5A, // usWinAscent |
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0x02, 0xB4, // usWinDescent |
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0x00, 0xCE, 0x00, 0x00, // ulCodePageRange1 (Bits 0-31) |
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0x00, 0x01, 0x00, 0x00, // ulCodePageRange2 (Bits 32-63) |
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0x00, 0x00, // sxHeight |
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0x00, 0x00, // sCapHeight |
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0x00, 0x01, // usDefaultChar |
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0x00, 0xCD, // usBreakChar |
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0x00, 0x02 // usMaxContext |
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]; |
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this._createTableEntry(otf, offsets, "OS/2", OS2); |
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|
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//XXX Getting charstrings here seems wrong since this is another CFF glue |
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var charstrings = aFont.getOrderedCharStrings(aFont.font); |
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|
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/** CMAP */ |
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cmap = this._createCMAPTable(charstrings); |
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this._createTableEntry(otf, offsets, "cmap", cmap); |
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|
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/** HEAD */ |
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head = [ |
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0x00, 0x01, 0x00, 0x00, // Version number |
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0x00, 0x00, 0x50, 0x00, // fontRevision |
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0x00, 0x00, 0x00, 0x00, // checksumAdjustement |
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0x5F, 0x0F, 0x3C, 0xF5, // magicNumber |
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0x00, 0x00, // Flags |
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0x03, 0xE8, // unitsPerEM (defaulting to 1000) |
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // creation date |
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // modifification date |
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0x00, 0x00, // xMin |
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0x00, 0x00, // yMin |
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0x00, 0x00, // xMax |
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0x00, 0x00, // yMax |
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0x00, 0x00, // macStyle |
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0x00, 0x00, // lowestRecPPEM |
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0x00, 0x00, // fontDirectionHint |
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0x00, 0x00, // indexToLocFormat |
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0x00, 0x00 // glyphDataFormat |
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]; |
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this._createTableEntry(otf, offsets, "head", head); |
|
|
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/** HHEA */ |
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hhea = [].concat( |
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[ |
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0x00, 0x01, 0x00, 0x00, // Version number |
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0x00, 0x00, // Typographic Ascent |
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0x00, 0x00, // Typographic Descent |
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0x00, 0x00, // Line Gap |
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0xFF, 0xFF, // advanceWidthMax |
|
0x00, 0x00, // minLeftSidebearing |
|
0x00, 0x00, // minRightSidebearing |
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0x00, 0x00, // xMaxExtent |
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0x00, 0x00, // caretSlopeRise |
|
0x00, 0x00, // caretSlopeRun |
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0x00, 0x00, // caretOffset |
|
0x00, 0x00, // -reserved- |
|
0x00, 0x00, // -reserved- |
|
0x00, 0x00, // -reserved- |
|
0x00, 0x00, // -reserved- |
|
0x00, 0x00 // metricDataFormat |
|
], |
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FontsUtils.integerToBytes(charstrings.length, 2) // numberOfHMetrics |
|
); |
|
this._createTableEntry(otf, offsets, "hhea", hhea); |
|
|
|
/** HMTX */ |
|
hmtx = [0x01, 0xF4, 0x00, 0x00]; |
|
for (var i = 0; i < charstrings.length; i++) { |
|
// XXX this can easily broke |
|
var charstring = charstrings[i].charstring; |
|
var width = FontsUtils.integerToBytes(charstring[1], 2); |
|
var lsb = FontsUtils.integerToBytes(charstring[0], 2); |
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hmtx = hmtx.concat(width, lsb); |
|
} |
|
this._createTableEntry(otf, offsets, "hmtx", hmtx); |
|
|
|
/** MAXP */ |
|
maxp = [].concat( |
|
[ |
|
0x00, 0x00, 0x50, 0x00, // Version number |
|
], |
|
FontsUtils.integerToBytes(charstrings.length + 1, 2) // Num of glyphs (+1 to pass the sanitizer...) |
|
); |
|
this._createTableEntry(otf, offsets, "maxp", maxp); |
|
|
|
/** NAME */ |
|
name = [ |
|
0x00, 0x00, // format |
|
0x00, 0x00, // Number of names Record |
|
0x00, 0x00 // Storage |
|
]; |
|
this._createTableEntry(otf, offsets, "name", name); |
|
|
|
/** POST */ |
|
// XXX get those info from the Font dict! |
|
post = [ |
|
0x00, 0x03, 0x00, 0x00, // Version number |
|
0x00, 0x00, 0x01, 0x00, // italicAngle |
|
0x00, 0x00, // underlinePosition |
|
0x00, 0x00, // underlineThickness |
|
0x00, 0x00, 0x00, 0x00, // isFixedPitch |
|
0x00, 0x00, 0x00, 0x00, // minMemType42 |
|
0x00, 0x00, 0x00, 0x00, // maxMemType42 |
|
0x00, 0x00, 0x00, 0x00, // minMemType1 |
|
0x00, 0x00, 0x00, 0x00 // maxMemType1 |
|
]; |
|
this._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]); |
|
|
|
//writeToFile(fontData, "/tmp/pdf.js." + fontCount + ".otf"); |
|
return fontData; |
|
} |
|
}; |
|
|
|
|
|
var FontsUtils = { |
|
integerToBytes: function fu_integerToBytes(aValue, aBytesCount) { |
|
var bytes = []; |
|
for (var i = 0; i < aBytesCount; i++) |
|
bytes[i] = 0x00; |
|
|
|
do { |
|
bytes[--aBytesCount] = (aValue & 0xFF); |
|
aValue = aValue >> 8; |
|
} while (aBytesCount && aValue > 0); |
|
|
|
return bytes; |
|
}, |
|
|
|
bytesToInteger: function(aBytesArray) { |
|
var value = 0; |
|
for (var i = 0; i < aBytesArray.length; i++) |
|
value = (value << 8) + aBytesArray[i]; |
|
return value; |
|
}, |
|
|
|
getMaxPower2: function fu_getMaxPower2(aNumber) { |
|
var maxPower = 0; |
|
var value = aNumber; |
|
while (value >= 2) { |
|
value /= 2; |
|
maxPower++; |
|
} |
|
|
|
value = 2; |
|
for (var i = 1; i < maxPower; i++) |
|
value *= 2; |
|
return value; |
|
} |
|
}; |
|
|
|
|
|
/** Implementation dirty logic starts here */ |
|
|
|
/** |
|
* At the moment TrueType is just a stub that does mostly nothing but in a |
|
* (near?) future this class will rewrite the font to ensure it is well formed |
|
* and valid in the point of view of the sanitizer. |
|
*/ |
|
var TrueType = function(aFile) { |
|
var header = this._readOpenTypeHeader(aFile); |
|
this.data = aFile; |
|
}; |
|
|
|
TrueType.prototype = { |
|
_readOpenTypeHeader: function(aFile) { |
|
return { |
|
version: aFile.getBytes(4), |
|
numTables: FontsUtils.bytesToInteger(aFile.getBytes(2)), |
|
searchRange: FontsUtils.bytesToInteger(aFile.getBytes(2)), |
|
entrySelector: FontsUtils.bytesToInteger(aFile.getBytes(2)), |
|
rangeShift: FontsUtils.bytesToInteger(aFile.getBytes(2)) |
|
} |
|
} |
|
}; |
|
|
|
/** |
|
* This dictionary holds decoded fonts data. |
|
*/ |
|
var PSFonts = new Dict(); |
|
|
|
var Stack = function(aStackSize) { |
|
var innerStack = new Array(aStackSize || 0); |
|
|
|
this.push = function(aOperand) { |
|
innerStack.push(aOperand); |
|
}; |
|
|
|
this.pop = function() { |
|
if (!this.count()) |
|
throw new Error("stackunderflow"); |
|
return innerStack.pop(); |
|
}; |
|
|
|
this.peek = function() { |
|
if (!this.count()) |
|
return null; |
|
return innerStack[innerStack.length - 1]; |
|
}; |
|
|
|
this.get = function(aIndex) { |
|
return innerStack[aIndex]; |
|
}; |
|
|
|
this.clear = function() { |
|
innerStack = []; |
|
}; |
|
|
|
this.count = function() { |
|
return innerStack.length; |
|
}; |
|
|
|
this.dump = function() { |
|
for (var i = 0; i < this.length; i++) |
|
log(innerStack[i]); |
|
}; |
|
|
|
this.clone = function() { |
|
return innerStack.slice(); |
|
}; |
|
}; |
|
|
|
var Type1Parser = function(aAsciiStream, aBinaryStream) { |
|
var lexer = aAsciiStream ? new Lexer(aAsciiStream) : null; |
|
|
|
// Turn on this flag for additional debugging logs |
|
var debug = false; |
|
|
|
var dump = function(aData) { |
|
if (debug) |
|
log(aData); |
|
}; |
|
|
|
// Hold the fontName as declared inside the /FontName postscript directive |
|
// XXX This is a hack but at the moment I need it to map the name declared |
|
// in the PDF and the name in the PS code. |
|
var fontName = ""; |
|
|
|
/* |
|
* Parse a whole Type1 font stream (from the first segment to the last) |
|
* assuming the 'eexec' block is binary data and fill up the 'Fonts' |
|
* dictionary with the font informations. |
|
*/ |
|
var self = this; |
|
this.parse = function() { |
|
if (!debug) { |
|
while (!processNextToken()) {}; |
|
return fontName; |
|
} else { |
|
// debug mode is used to debug postcript processing |
|
setTimeout(function() { |
|
if (!processNextToken()) |
|
self.parse(); |
|
}, 0); |
|
} |
|
}; |
|
|
|
/* |
|
* 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(aStream, aKey, aDiscardNumber) { |
|
var start = Date.now(); |
|
var r = aKey, c1 = 52845, c2 = 22719; |
|
var decryptedString = []; |
|
|
|
var value = ""; |
|
var count = aStream.length; |
|
for (var i = 0; i < count; i++) { |
|
value = aStream.getByte(); |
|
decryptedString[i] = String.fromCharCode(value ^ (r >> 8)); |
|
r = ((value + r) * c1 + c2) & ((1 << 16) - 1); |
|
} |
|
var end = Date.now(); |
|
dump("Time to decrypt string of length " + count + " is " + (end - start)); |
|
return decryptedString.slice(aDiscardNumber); |
|
}; |
|
|
|
/* |
|
* 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", |
|
"9": "closepath", |
|
"10": "callsubr", |
|
"11": "return", |
|
"12": { |
|
"0": "dotsection", |
|
"1": "vstem3", |
|
"3": "hstem3", |
|
"6": "seac", |
|
"7": "sbw", |
|
"12": "div", |
|
"16": "callothersubr", |
|
"17": "pop", |
|
"33": "setcurrentpoint" |
|
}, |
|
"13": "hsbw", |
|
"14": "endchar", |
|
"21": "rmoveto", |
|
"22": "hmoveto", |
|
"30": "vhcurveto", |
|
"31": "hvcurveto" |
|
}; |
|
|
|
function decodeCharString(aStream) { |
|
var start = Date.now(); |
|
var charString = []; |
|
|
|
var value = ""; |
|
var count = aStream.length; |
|
for (var i = 0; i < count; i++) { |
|
value = aStream.getByte(); |
|
|
|
if (value < 32) { |
|
if (value == 12) { |
|
value = charStringDictionary["12"][aStream.getByte()]; |
|
i++; |
|
} else { |
|
value = charStringDictionary[value]; |
|
} |
|
} else if (value <= 246) { |
|
value = parseInt(value) - 139; |
|
} else if (value <= 250) { |
|
value = ((value - 247) * 256) + parseInt(aStream.getByte()) + 108; |
|
i++; |
|
} else if (value <= 254) { |
|
value = -((value - 251) * 256) - parseInt(aStream.getByte()) - 108; |
|
i++; |
|
} else { |
|
var byte = aStream.getByte(); |
|
var high = (byte >> 1); |
|
value = (byte - high) << 24 | aStream.getByte() << 16 | |
|
aStream.getByte() << 8 | aStream.getByte(); |
|
i += 4; |
|
} |
|
|
|
charString.push(value); |
|
} |
|
|
|
var end = Date.now(); |
|
dump("Time to decode charString of length " + count + " is " + (end - start)); |
|
return charString; |
|
} |
|
|
|
/* |
|
* The operand stack holds arbitrary PostScript objects that are the operands |
|
* and results of PostScript operators being executed. The interpreter pushes |
|
* objects on the operand stack when it encounters them as literal data in a |
|
* program being executed. When an operator requires one or more operands, it |
|
* obtains them by popping them off the top of the operand stack. When an |
|
* operator returns one or more results, it does so by pushing them on the |
|
* operand stack. |
|
*/ |
|
var operandStack = new Stack(40); |
|
|
|
// Flag indicating if the topmost operand of the operandStack is an array |
|
var operandIsArray = 0; |
|
|
|
/* |
|
* The dictionary stack holds only dictionary objects. The current set of |
|
* dictionaries on the dictionary stack defines the environment for all |
|
* implicit name searches, such as those that occur when the interpreter |
|
* encounters an executable name. The role of the dictionary stack is |
|
* introduced in Section 3.3, “Data Types and Objects,” and is further |
|
* explained in Section 3.5, “Execution.” of the PostScript Language |
|
* Reference. |
|
*/ |
|
var systemDict = new Dict(), |
|
globalDict = new Dict(), |
|
userDict = new Dict(); |
|
|
|
var dictionaryStack = new Stack(); |
|
dictionaryStack.push(systemDict); |
|
dictionaryStack.push(globalDict); |
|
dictionaryStack.push(userDict); |
|
|
|
/* |
|
* The execution stack holds executable objects (mainly procedures and files) |
|
* that are in intermediate stages of execution. At any point in the |
|
* execution of a PostScript program, this stack represents the program’s |
|
* call stack. Whenever the interpreter suspends execution of an object to |
|
* execute some other object, it pushes the new object on the execution |
|
* stack. When the interpreter finishes executing an object, it pops that |
|
* object off the execution stack and resumes executing the suspended object |
|
* beneath it. |
|
*/ |
|
var executionStack = new Stack(); |
|
|
|
/* |
|
* Return the next token in the execution stack |
|
*/ |
|
function nextInStack() { |
|
var currentProcedure = executionStack.peek(); |
|
if (currentProcedure) { |
|
var command = currentProcedure.shift(); |
|
if (!currentProcedure.length) |
|
executionStack.pop(); |
|
return command; |
|
} |
|
|
|
return lexer.getObj(); |
|
}; |
|
|
|
/* |
|
* Get the next token from the executionStack and process it. |
|
* Actually the function does not process the third segment of a Type1 font |
|
* and end on 'closefile'. |
|
* |
|
* The method thrown an error if it encounters an unknown token. |
|
*/ |
|
function processNextToken() { |
|
var obj = nextInStack(); |
|
if (operandIsArray && !IsCmd(obj, "{") && !IsCmd(obj, "[") && |
|
!IsCmd(obj, "]") && !IsCmd(obj, "}")) { |
|
dump("Adding an object: " + obj +" to array " + operandIsArray); |
|
var currentArray = operandStack.peek(); |
|
for (var i = 1; i < operandIsArray; i++) |
|
currentArray = currentArray[currentArray.length - 1]; |
|
|
|
currentArray.push(obj); |
|
} else if (IsBool(obj) || IsInt(obj) || IsNum(obj) || IsString(obj)) { |
|
dump("Value: " + obj); |
|
operandStack.push(obj); |
|
} else if (IsName(obj)) { |
|
dump("Name: " + obj.name); |
|
operandStack.push(obj.name); |
|
} else if (IsCmd(obj)) { |
|
var command = obj.cmd; |
|
dump(command); |
|
|
|
switch (command) { |
|
case "[": |
|
case "{": |
|
dump("Start" + (command == "{" ? " Executable " : " ") + "Array"); |
|
operandIsArray++; |
|
var currentArray = operandStack; |
|
for (var i = 1; i < operandIsArray; i++) |
|
if (currentArray.peek) |
|
currentArray = currentArray.peek(); |
|
else |
|
currentArray = currentArray[currentArray.length - 1]; |
|
currentArray.push([]); |
|
break; |
|
|
|
case "]": |
|
case "}": |
|
var currentArray = operandStack.peek(); |
|
for (var i = 1; i < operandIsArray; i++) |
|
currentArray = currentArray[currentArray.length - 1]; |
|
dump("End" + (command == "}" ? " Executable " : " ") + "Array: " + currentArray.join(" ")); |
|
operandIsArray--; |
|
break; |
|
|
|
case "if": |
|
var procedure = operandStack.pop(); |
|
var bool = operandStack.pop(); |
|
if (!IsBool(bool)) { |
|
dump("if: " + bool); |
|
// we need to execute things, let be dirty |
|
executionStack.push(bool); |
|
} else { |
|
dump("if ( " + bool + " ) { " + procedure + " }"); |
|
if (bool) |
|
executionStack.push(procedure); |
|
} |
|
break; |
|
|
|
case "ifelse": |
|
var procedure1 = operandStack.pop(); |
|
var procedure2 = operandStack.pop(); |
|
var bool = !!operandStack.pop(); |
|
dump("if ( " + bool + " ) { " + procedure2 + " } else { " + procedure1 + " }"); |
|
executionStack.push(bool ? procedure2 : procedure1); |
|
break; |
|
|
|
case "for": |
|
var procedure = operandStack.pop(); |
|
var limit = operandStack.pop(); |
|
var increment = operandStack.pop(); |
|
var initial = operandStack.pop(); |
|
for (var i = 0; i < limit; i += increment) { |
|
operandStack.push(i); |
|
executionStack.push(procedure.slice()); |
|
} |
|
break; |
|
|
|
case "dup": |
|
dump("duplicate: " + operandStack.peek()); |
|
operandStack.push(operandStack.peek()); |
|
break; |
|
|
|
case "mark": |
|
operandStack.push("mark"); |
|
break; |
|
|
|
case "cleartomark": |
|
var command = ""; |
|
do { |
|
command = operandStack.pop(); |
|
} while (command != "mark"); |
|
break; |
|
|
|
case "put": |
|
var data = operandStack.pop(); |
|
var indexOrKey = operandStack.pop(); |
|
var object = operandStack.pop(); |
|
dump("put " + data + " in " + object + "[" + indexOrKey + "]"); |
|
object.set ? object.set(indexOrKey, data) |
|
: object[indexOrKey] = data; |
|
break; |
|
|
|
case "pop": |
|
operandStack.pop(); |
|
break; |
|
|
|
case "exch": |
|
var operand1 = operandStack.pop(); |
|
var operand2 = operandStack.pop(); |
|
operandStack.push(operand1); |
|
operandStack.push(operand2); |
|
break; |
|
|
|
case "get": |
|
var indexOrKey = operandStack.pop(); |
|
var object = operandStack.pop(); |
|
var data = object.get ? object.get(indexOrKey) : object[indexOrKey]; |
|
dump("get " + object + "[" + indexOrKey + "]: " + data); |
|
operandStack.push(data); |
|
break; |
|
|
|
case "currentdict": |
|
var dict = dictionaryStack.peek(); |
|
operandStack.push(dict); |
|
break; |
|
|
|
case "systemdict": |
|
operandStack.push(systemDict); |
|
break; |
|
|
|
case "readonly": |
|
case "executeonly": |
|
case "noaccess": |
|
// Do nothing for the moment |
|
break; |
|
|
|
case "currentfile": |
|
operandStack.push("currentfile"); |
|
break; |
|
|
|
case "array": |
|
var size = operandStack.pop(); |
|
var array = new Array(size); |
|
operandStack.push(array); |
|
break; |
|
|
|
case "dict": |
|
var size = operandStack.pop(); |
|
var dict = new Dict(size); |
|
operandStack.push(dict); |
|
break; |
|
|
|
case "begin": |
|
dictionaryStack.push(operandStack.pop()); |
|
break; |
|
|
|
case "end": |
|
dictionaryStack.pop(); |
|
break; |
|
|
|
case "def": |
|
var value = operandStack.pop(); |
|
var key = operandStack.pop(); |
|
dump("def: " + key + " = " + value); |
|
dictionaryStack.peek().set(key, value); |
|
break; |
|
|
|
case "definefont": |
|
var font = operandStack.pop(); |
|
var key = operandStack.pop(); |
|
dump("definefont " + font + " with key: " + key); |
|
|
|
// The key will be the identifier to recognize this font |
|
fontName = key; |
|
PSFonts.set(key, font); |
|
|
|
operandStack.push(font); |
|
break; |
|
|
|
case "known": |
|
var name = operandStack.pop(); |
|
var dict = operandStack.pop(); |
|
var data = !!dict.get(name); |
|
dump("known: " + data + " :: " + name + " in dict: " + dict); |
|
operandStack.push(data); |
|
break; |
|
|
|
case "exec": |
|
executionStack.push(operandStack.pop()); |
|
break; |
|
|
|
case "eexec": |
|
// All the first segment data has been read, decrypt the second segment |
|
// and start interpreting it in order to decode it |
|
var file = operandStack.pop(); |
|
var eexecString = decrypt(aBinaryStream, kEexecEncryptionKey, 4).join(""); |
|
lexer = new Lexer(new StringStream(eexecString)); |
|
break; |
|
|
|
case "LenIV": |
|
error("LenIV: argh! we need to modify the length of discard characters for charStrings"); |
|
break; |
|
|
|
case "closefile": |
|
var file = operandStack.pop(); |
|
return true; |
|
break; |
|
|
|
case "index": |
|
var operands = []; |
|
var size = operandStack.pop(); |
|
for (var i = 0; i < size; i++) |
|
operands.push(operandStack.pop()); |
|
|
|
var newOperand = operandStack.peek(); |
|
|
|
while (operands.length) |
|
operandStack.push(operands.pop()); |
|
|
|
operandStack.push(newOperand); |
|
break; |
|
|
|
case "string": |
|
var size = operandStack.pop(); |
|
var str = (new Array(size + 1)).join(" "); |
|
operandStack.push(str); |
|
break; |
|
|
|
case "readstring": |
|
var str = operandStack.pop(); |
|
var size = str.length; |
|
|
|
var file = operandStack.pop(); |
|
|
|
// Add '1' because of the space separator, this is dirty |
|
var stream = lexer.stream.makeSubStream(lexer.stream.start + lexer.stream.pos + 1, size); |
|
lexer.stream.skip(size + 1); |
|
|
|
var charString = decrypt(stream, kCharStringsEncryptionKey, 4).join(""); |
|
var charStream = new StringStream(charString); |
|
var decodedCharString = decodeCharString(charStream); |
|
operandStack.push(decodedCharString); |
|
|
|
// boolean indicating if the operation is a success or not |
|
operandStack.push(true); |
|
break; |
|
|
|
case "StandardEncoding": |
|
// For some reason the value is considered as a command, maybe it is |
|
// because of the uppercase 'S' |
|
operandStack.push(obj.cmd); |
|
break; |
|
|
|
default: |
|
var command = null; |
|
if (IsCmd(obj)) { |
|
for (var i = 0; i < dictionaryStack.count(); i++) { |
|
if (command = dictionaryStack.get(i).get(obj.cmd)) { |
|
dump("found in dictionnary for " + obj.cmd + " command: " + command); |
|
executionStack.push(command.slice()); |
|
break; |
|
} |
|
} |
|
} |
|
|
|
if (!command) { |
|
log("operandStack: " + operandStack); |
|
log("dictionaryStack: " + dictionaryStack); |
|
log(obj); |
|
error("Unknow command while parsing font"); |
|
} |
|
break; |
|
} |
|
} else if (obj) { |
|
dump("unknow: " + obj); |
|
operandStack.push(obj); |
|
} else { // The End! |
|
operandStack.dump(); |
|
return true; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
/* |
|
* Flatten the commands by interpreting the postscript code and replacing |
|
* every 'callsubr', 'callothersubr' by the real commands. |
|
* At the moment OtherSubrs are not fully supported and only otherSubrs 0-4 |
|
* as descrived in 'Using Subroutines' of 'Adobe Type 1 Font Format', |
|
* chapter 8. |
|
*/ |
|
this.flattenCharstring = function(aCharstring, aDefaultWidth, aSubrs) { |
|
operandStack.clear(); |
|
executionStack.clear(); |
|
executionStack.push(aCharstring); |
|
|
|
var leftSidebearing = 0; |
|
var lastPoint = 0; |
|
while (true) { |
|
var obj = nextInStack(); |
|
if (IsBool(obj) || IsInt(obj) || IsNum(obj)) { |
|
dump("Value: " + obj); |
|
operandStack.push(obj); |
|
} else if (IsString(obj)) { |
|
dump("String: " + obj); |
|
switch (obj) { |
|
case "hsbw": |
|
var charWidthVector = operandStack.pop(); |
|
leftSidebearing = operandStack.pop(); |
|
|
|
if (charWidthVector != aDefaultWidth) |
|
operandStack.push(charWidthVector - aDefaultWidth); |
|
break; |
|
|
|
case "rmoveto": |
|
var dy = operandStack.pop(); |
|
var dx = operandStack.pop(); |
|
|
|
if (leftSidebearing) { |
|
dx += leftSidebearing; |
|
leftSidebearing = 0; |
|
} |
|
|
|
operandStack.push(dx); |
|
operandStack.push(dy); |
|
operandStack.push("rmoveto"); |
|
break; |
|
|
|
case "div": |
|
var num2 = operandStack.pop(); |
|
var num1 = operandStack.pop(); |
|
operandStack.push(num2 / num1); |
|
break; |
|
|
|
case "setcurrentpoint": |
|
case "dotsection": |
|
case "seac": |
|
case "sbw": |
|
error(obj + " parsing is not implemented (yet)"); |
|
break; |
|
|
|
case "closepath": |
|
case "return": |
|
break; |
|
|
|
case "vstem3": |
|
case "vstem": |
|
operandStack.push("vstem"); |
|
break; |
|
|
|
case "hstem": |
|
case "hstem3": |
|
operandStack.push("hstem"); |
|
break; |
|
|
|
case "callsubr": |
|
var index = operandStack.pop(); |
|
executionStack.push(aSubrs[index].slice()); |
|
break; |
|
|
|
case "callothersubr": |
|
// XXX need to be improved |
|
var index = operandStack.pop(); |
|
var count = operandStack.pop(); |
|
var data = operandStack.pop(); |
|
if (index != 3) |
|
dump("callothersubr for index: " + index); |
|
operandStack.push(3); |
|
operandStack.push("callothersubr"); |
|
break; |
|
|
|
case "endchar": |
|
operandStack.push("endchar"); |
|
return operandStack.clone(); |
|
|
|
case "pop": |
|
operandStack.pop(); |
|
break; |
|
|
|
default: |
|
operandStack.push(obj); |
|
break; |
|
} |
|
} |
|
} |
|
} |
|
}; |
|
|
|
var CFF = function(aFontFile) { |
|
var start = Date.now(); |
|
|
|
var length1 = aFontFile.dict.get("Length1"); |
|
var length2 = aFontFile.dict.get("Length2"); |
|
|
|
var ASCIIStream = new Stream(aFontFile.getBytes(length1)); |
|
var binaryStream = new Stream(aFontFile.getBytes(length2)); |
|
|
|
this.parser = new Type1Parser(ASCIIStream, binaryStream); |
|
var fontName = this.parser.parse(); |
|
this.font = PSFonts.get(fontName); |
|
this.data = this.convertToCFF(this.font); |
|
var end = Date.now(); |
|
//log("Time to parse font is:" + (end - start)); |
|
}; |
|
|
|
CFF.prototype = { |
|
getDefaultWidth: function(aCharstrings) { |
|
var defaultWidth = 0; |
|
var defaultUsedCount = 0; |
|
|
|
var widths = {}; |
|
for (var i = 0; i < aCharstrings.length; i++) { |
|
var width = aCharstrings[i].charstring[1]; |
|
var usedCount = (widths[width] || 0) + 1; |
|
|
|
if (usedCount > defaultUsedCount) { |
|
defaultUsedCount = usedCount; |
|
defaultWidth = width; |
|
} |
|
|
|
widths[width] = usedCount; |
|
} |
|
return parseInt(defaultWidth); |
|
}, |
|
|
|
createCFFIndexHeader: function(aObjects, aIsByte) { |
|
var data = []; |
|
|
|
// First 2 bytes contains the number of objects contained into this index |
|
var count = aObjects.length; |
|
if (count ==0) |
|
return [0x00, 0x00, 0x00]; |
|
|
|
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 (aObjects[i]) |
|
relativeOffset += aObjects[i].length; |
|
} |
|
|
|
for (var i =0; i < count; i++) { |
|
for (var j = 0; j < aObjects[i].length; j++) |
|
data.push(aIsByte ? aObjects[i][j] : aObjects[i].charCodeAt(j)); |
|
} |
|
return data; |
|
}, |
|
|
|
encodeNumber: function(aValue) { |
|
var x = 0; |
|
// XXX we don't really care about Type2 optimization here... |
|
if (aValue >= -32768 && aValue <= 32767) { |
|
return [ |
|
28, |
|
FontsUtils.integerToBytes(aValue >> 8, 1), |
|
FontsUtils.integerToBytes(aValue, 1) |
|
]; |
|
} else if (aValue >= (-2147483647-1) && aValue <= 2147483647) { |
|
return [ |
|
0xFF, |
|
FontsUtils.integerToBytes(aValue >> 24, 1), |
|
FontsUtils.integerToBytes(aValue >> 16, 1), |
|
FontsUtils.integerToBytes(aValue >> 8, 1), |
|
FontsUtils.integerToBytes(aValue, 1) |
|
]; |
|
} else { |
|
error("Value: " + aValue + " is not allowed"); |
|
} |
|
}, |
|
|
|
getOrderedCharStrings: function(aFont) { |
|
var dict = aFont.get("CharStrings") |
|
var charstrings = []; |
|
for (var glyph in dict.map) { |
|
var unicode = GlyphsUnicode[glyph]; |
|
if (!unicode) { |
|
if (glyph != ".notdef") |
|
warn(glyph + " does not have an entry in the glyphs unicode dictionary"); |
|
continue; |
|
} |
|
|
|
var b1 = parseInt("0x" + unicode[0] + unicode[1]); |
|
var b2 = parseInt("0x" + unicode[2] + unicode[3]); |
|
unicode = FontsUtils.bytesToInteger([b1, b2]); |
|
|
|
charstrings.push({ |
|
glyph: glyph, |
|
unicode: unicode, |
|
charstring: dict.map[glyph].slice() |
|
}); |
|
} |
|
|
|
charstrings.sort(function(a, b) { |
|
return a.unicode > b.unicode; |
|
}); |
|
return charstrings; |
|
}, |
|
|
|
convertToCFF: function(aFont) { |
|
var debug = false; |
|
function dump(aMsg) { |
|
if (debug) |
|
log(aMsg); |
|
}; |
|
|
|
var charstrings = this.getOrderedCharStrings(aFont); |
|
var defaultWidth = this.getDefaultWidth(charstrings); |
|
|
|
var charstringsCount = 0; |
|
var charstringsDataLength = 0; |
|
var glyphs = []; |
|
var glyphsChecker = {}; |
|
var subrs = aFont.get("Private").get("Subrs"); |
|
var parser = new Type1Parser(); |
|
for (var i = 0; i < charstrings.length; i++) { |
|
var charstring = charstrings[i].charstring.slice(); |
|
var glyph = charstrings[i].glyph; |
|
if (glyphsChecker[glyph]) |
|
error("glyphs already exists!"); |
|
glyphsChecker[glyph] = true; |
|
|
|
var flattened = parser.flattenCharstring(charstring, defaultWidth, subrs); |
|
glyphs.push(flattened); |
|
charstringsCount++; |
|
charstringsDataLength += flattened.length; |
|
} |
|
dump("There is " + charstringsCount + " glyphs (size: " + charstringsDataLength + ")"); |
|
|
|
// 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([aFont.get("FontName")]); |
|
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 fontInfo = aFont.get("FontInfo"); |
|
var version = fontInfo.get("version"); |
|
var notice = fontInfo.get("Notice"); |
|
var fullName = fontInfo.get("FullName"); |
|
var familyName = fontInfo.get("FamilyName"); |
|
var weight = fontInfo.get("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 < glyphs.length; i++) { |
|
var index = CFFStrings.indexOf(charstrings[i].glyph); |
|
if (index == -1) |
|
index = CFFStrings.length + strings.indexOf(glyph); |
|
var bytes = FontsUtils.integerToBytes(index, 2); |
|
charset.push(bytes[0]); |
|
charset.push(bytes[1]); |
|
} |
|
|
|
// Convert charstrings |
|
var getNumFor = { |
|
"hstem": 1, |
|
"vstem": 3, |
|
"vmoveto": 4, |
|
"rlineto": 5, |
|
"hlineto": 6, |
|
"vlineto": 7, |
|
"rrcurveto": 8, |
|
"endchar": 14, |
|
"rmoveto": 21, |
|
"hmoveto": 22, |
|
"vhcurveto": 30, |
|
"hvcurveto": 31, |
|
}; |
|
|
|
// Encode the glyph and add it to the FUX |
|
var r = [[0x40, 0x0E]]; |
|
for (var i = 0; i < glyphs.length; i++) { |
|
var data = glyphs[i].slice(); |
|
var charstring = []; |
|
for (var j = 0; j < data.length; j++) { |
|
var c = data[j]; |
|
if (!IsNum(c)) { |
|
var token = getNumFor[c]; |
|
if (!token) |
|
error(c); |
|
charstring.push(token); |
|
} else { |
|
try { |
|
var bytes = this.encodeNumber(c); |
|
} catch(e) { |
|
log("Glyph " + i + " has a wrong value: " + c + " in charstring: " + data); |
|
log("the default value is glyph " + charstrings[i].glyph + " and is supposed to be: " + charstrings[i].charstring); |
|
} |
|
for (var k = 0; k < bytes.length; k++) |
|
charstring.push(bytes[k]); |
|
} |
|
} |
|
r.push(charstring); |
|
} |
|
|
|
var charstringsIndex = this.createCFFIndexHeader(r, true); |
|
charstringsIndex = charstringsIndex.join(" ").split(" "); // XXX why? |
|
|
|
|
|
var fontBBox = aFont.get("FontBBox"); |
|
|
|
//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 |
|
]; |
|
|
|
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 + (charstringsCount * 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 |
|
topDictIndex = topDictIndex.join(" ").split(" "); |
|
|
|
// Top Dict Index |
|
cff.set(topDictIndex, currentOffset); |
|
currentOffset += topDictIndex.length; |
|
|
|
// Strings Index |
|
cff.set(stringsIndex, currentOffset); |
|
currentOffset += stringsIndex.length; |
|
|
|
// Global Subrs Index |
|
cff.set(globalSubrsIndex, currentOffset); |
|
currentOffset += globalSubrsIndex.length; |
|
|
|
// Charset Index |
|
cff.set(charset, currentOffset); |
|
currentOffset += charset.length; |
|
|
|
// Fill charstrings data |
|
cff.set(charstringsIndex, currentOffset); |
|
currentOffset += charstringsIndex.length; |
|
|
|
// Private Data |
|
var privateData = [ |
|
248, 136, 20, |
|
248, 136, 21, |
|
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 |
|
]; |
|
cff.set(privateData, currentOffset); |
|
currentOffset += privateData.length; |
|
|
|
// Dump shit at the end of the file |
|
var shit = [ |
|
0x00, 0x01, 0x01, 0x01, |
|
0x13, 0x5D, 0x65, 0x64, |
|
0x5E, 0x5B, 0xAF, 0x66, |
|
0xBA, 0xBB, 0xB1, 0xB0, |
|
0xB9, 0xBA, 0x65, 0xB2, |
|
0x5C, 0x1F, 0x0B |
|
]; |
|
cff.set(shit, currentOffset); |
|
currentOffset += shit.length; |
|
|
|
|
|
dump("==================== debug ===================="); |
|
//var file = new Uint8Array(cff, 0, currentOffset); |
|
//var parser = new Type2Parser(); |
|
//parser.parse(new Stream(file)); |
|
|
|
var fontData = []; |
|
for (var i = 0; i < currentOffset; i++) |
|
fontData.push(cff[i]); |
|
|
|
//log("== write to file"); |
|
//writeToFile(fontData, "/tmp/pdf.js." + fontCount + ".cff"); |
|
|
|
return fontData; |
|
} |
|
}; |
|
|
|
|