222 lines
8.5 KiB
JavaScript
222 lines
8.5 KiB
JavaScript
/* Copyright 2012 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { FontType, info } from "../shared/util.js";
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import { getEncoding, StandardEncoding } from "./encodings.js";
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import { getGlyphsUnicode } from "./glyphlist.js";
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import { getUnicodeForGlyph } from "./unicode.js";
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// Accented characters have issues on Windows and Linux. When this flag is
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// enabled glyphs that use seac and seac style endchar operators are truncated
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// and we instead just store the glyph id's of the base glyph and its accent to
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// be drawn individually.
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// Linux (freetype) requires that when a seac style endchar is used
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// that the charset must be a predefined one, however we build a
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// custom one. Windows just refuses to draw glyphs with seac operators.
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const SEAC_ANALYSIS_ENABLED = true;
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const FontFlags = {
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FixedPitch: 1,
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Serif: 2,
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Symbolic: 4,
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Script: 8,
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Nonsymbolic: 32,
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Italic: 64,
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AllCap: 65536,
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SmallCap: 131072,
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ForceBold: 262144,
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};
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// prettier-ignore
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const MacStandardGlyphOrdering = [
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".notdef", ".null", "nonmarkingreturn", "space", "exclam", "quotedbl",
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"numbersign", "dollar", "percent", "ampersand", "quotesingle", "parenleft",
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"parenright", "asterisk", "plus", "comma", "hyphen", "period", "slash",
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"zero", "one", "two", "three", "four", "five", "six", "seven", "eight",
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"nine", "colon", "semicolon", "less", "equal", "greater", "question", "at",
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"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O",
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"P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "bracketleft",
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"backslash", "bracketright", "asciicircum", "underscore", "grave", "a", "b",
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"c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q",
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"r", "s", "t", "u", "v", "w", "x", "y", "z", "braceleft", "bar", "braceright",
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"asciitilde", "Adieresis", "Aring", "Ccedilla", "Eacute", "Ntilde",
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"Odieresis", "Udieresis", "aacute", "agrave", "acircumflex", "adieresis",
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"atilde", "aring", "ccedilla", "eacute", "egrave", "ecircumflex", "edieresis",
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"iacute", "igrave", "icircumflex", "idieresis", "ntilde", "oacute", "ograve",
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"ocircumflex", "odieresis", "otilde", "uacute", "ugrave", "ucircumflex",
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"udieresis", "dagger", "degree", "cent", "sterling", "section", "bullet",
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"paragraph", "germandbls", "registered", "copyright", "trademark", "acute",
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"dieresis", "notequal", "AE", "Oslash", "infinity", "plusminus", "lessequal",
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"greaterequal", "yen", "mu", "partialdiff", "summation", "product", "pi",
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"integral", "ordfeminine", "ordmasculine", "Omega", "ae", "oslash",
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"questiondown", "exclamdown", "logicalnot", "radical", "florin",
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"approxequal", "Delta", "guillemotleft", "guillemotright", "ellipsis",
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"nonbreakingspace", "Agrave", "Atilde", "Otilde", "OE", "oe", "endash",
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"emdash", "quotedblleft", "quotedblright", "quoteleft", "quoteright",
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"divide", "lozenge", "ydieresis", "Ydieresis", "fraction", "currency",
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"guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl", "periodcentered",
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"quotesinglbase", "quotedblbase", "perthousand", "Acircumflex",
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"Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute", "Icircumflex",
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"Idieresis", "Igrave", "Oacute", "Ocircumflex", "apple", "Ograve", "Uacute",
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"Ucircumflex", "Ugrave", "dotlessi", "circumflex", "tilde", "macron",
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"breve", "dotaccent", "ring", "cedilla", "hungarumlaut", "ogonek", "caron",
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"Lslash", "lslash", "Scaron", "scaron", "Zcaron", "zcaron", "brokenbar",
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"Eth", "eth", "Yacute", "yacute", "Thorn", "thorn", "minus", "multiply",
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"onesuperior", "twosuperior", "threesuperior", "onehalf", "onequarter",
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"threequarters", "franc", "Gbreve", "gbreve", "Idotaccent", "Scedilla",
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"scedilla", "Cacute", "cacute", "Ccaron", "ccaron", "dcroat"];
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function getFontType(type, subtype, isStandardFont = false) {
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switch (type) {
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case "Type1":
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if (isStandardFont) {
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return FontType.TYPE1STANDARD;
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}
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return subtype === "Type1C" ? FontType.TYPE1C : FontType.TYPE1;
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case "CIDFontType0":
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return subtype === "CIDFontType0C"
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? FontType.CIDFONTTYPE0C
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: FontType.CIDFONTTYPE0;
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case "OpenType":
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return FontType.OPENTYPE;
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case "TrueType":
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return FontType.TRUETYPE;
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case "CIDFontType2":
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return FontType.CIDFONTTYPE2;
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case "MMType1":
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return FontType.MMTYPE1;
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case "Type0":
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return FontType.TYPE0;
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default:
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return FontType.UNKNOWN;
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}
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}
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// Some bad PDF generators, e.g. Scribus PDF, include glyph names
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// in a 'uniXXXX' format -- attempting to recover proper ones.
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function recoverGlyphName(name, glyphsUnicodeMap) {
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if (glyphsUnicodeMap[name] !== undefined) {
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return name;
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}
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// The glyph name is non-standard, trying to recover.
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const unicode = getUnicodeForGlyph(name, glyphsUnicodeMap);
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if (unicode !== -1) {
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for (const key in glyphsUnicodeMap) {
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if (glyphsUnicodeMap[key] === unicode) {
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return key;
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}
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}
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}
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info("Unable to recover a standard glyph name for: " + name);
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return name;
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}
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/**
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* Shared logic for building a char code to glyph id mapping for Type1 and
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* simple CFF fonts. See section 9.6.6.2 of the spec.
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* @param {Object} properties Font properties object.
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* @param {Object} builtInEncoding The encoding contained within the actual font
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* data.
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* @param {Array} glyphNames Array of glyph names where the index is the
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* glyph ID.
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* @returns {Object} A char code to glyph ID map.
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*/
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function type1FontGlyphMapping(properties, builtInEncoding, glyphNames) {
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const charCodeToGlyphId = Object.create(null);
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let glyphId, charCode, baseEncoding;
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const isSymbolicFont = !!(properties.flags & FontFlags.Symbolic);
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if (properties.isInternalFont) {
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baseEncoding = builtInEncoding;
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for (charCode = 0; charCode < baseEncoding.length; charCode++) {
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glyphId = glyphNames.indexOf(baseEncoding[charCode]);
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if (glyphId >= 0) {
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charCodeToGlyphId[charCode] = glyphId;
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} else {
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charCodeToGlyphId[charCode] = 0; // notdef
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}
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}
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} else if (properties.baseEncodingName) {
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// If a valid base encoding name was used, the mapping is initialized with
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// that.
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baseEncoding = getEncoding(properties.baseEncodingName);
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for (charCode = 0; charCode < baseEncoding.length; charCode++) {
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glyphId = glyphNames.indexOf(baseEncoding[charCode]);
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if (glyphId >= 0) {
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charCodeToGlyphId[charCode] = glyphId;
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} else {
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charCodeToGlyphId[charCode] = 0; // notdef
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}
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}
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} else if (isSymbolicFont) {
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// For a symbolic font the encoding should be the fonts built-in encoding.
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for (charCode in builtInEncoding) {
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charCodeToGlyphId[charCode] = builtInEncoding[charCode];
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}
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} else {
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// For non-symbolic fonts that don't have a base encoding the standard
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// encoding should be used.
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baseEncoding = StandardEncoding;
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for (charCode = 0; charCode < baseEncoding.length; charCode++) {
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glyphId = glyphNames.indexOf(baseEncoding[charCode]);
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if (glyphId >= 0) {
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charCodeToGlyphId[charCode] = glyphId;
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} else {
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charCodeToGlyphId[charCode] = 0; // notdef
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}
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}
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}
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// Lastly, merge in the differences.
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const differences = properties.differences;
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let glyphsUnicodeMap;
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if (differences) {
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for (charCode in differences) {
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const glyphName = differences[charCode];
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glyphId = glyphNames.indexOf(glyphName);
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if (glyphId === -1) {
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if (!glyphsUnicodeMap) {
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glyphsUnicodeMap = getGlyphsUnicode();
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}
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const standardGlyphName = recoverGlyphName(glyphName, glyphsUnicodeMap);
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if (standardGlyphName !== glyphName) {
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glyphId = glyphNames.indexOf(standardGlyphName);
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}
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}
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if (glyphId >= 0) {
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charCodeToGlyphId[charCode] = glyphId;
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} else {
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charCodeToGlyphId[charCode] = 0; // notdef
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}
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}
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}
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return charCodeToGlyphId;
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}
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function normalizeFontName(name) {
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return name.replace(/[,_]/g, "-").replace(/\s/g, "");
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}
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export {
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FontFlags,
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getFontType,
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MacStandardGlyphOrdering,
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normalizeFontName,
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recoverGlyphName,
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SEAC_ANALYSIS_ENABLED,
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type1FontGlyphMapping,
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};
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