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fonts.js
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/* Copyright 2012 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {
assert,
bytesToString,
FONT_IDENTITY_MATRIX,
FormatError,
info,
shadow,
string32,
warn,
} from "../shared/util.js";
import { CFFCompiler, CFFParser } from "./cff_parser.js";
import {
FontFlags,
getVerticalPresentationForm,
MacStandardGlyphOrdering,
normalizeFontName,
recoverGlyphName,
SEAC_ANALYSIS_ENABLED,
} from "./fonts_utils.js";
import {
getCharUnicodeCategory,
getUnicodeForGlyph,
getUnicodeRangeFor,
mapSpecialUnicodeValues,
} from "./unicode.js";
import { getDingbatsGlyphsUnicode, getGlyphsUnicode } from "./glyphlist.js";
import {
getEncoding,
MacRomanEncoding,
StandardEncoding,
SymbolSetEncoding,
WinAnsiEncoding,
ZapfDingbatsEncoding,
} from "./encodings.js";
import {
getGlyphMapForStandardFonts,
getNonStdFontMap,
getSerifFonts,
getStdFontMap,
getSupplementalGlyphMapForArialBlack,
getSupplementalGlyphMapForCalibri,
} from "./standard_fonts.js";
import { IdentityToUnicodeMap, ToUnicodeMap } from "./to_unicode_map.js";
import { CFFFont } from "./cff_font.js";
import { FontRendererFactory } from "./font_renderer.js";
import { getFontBasicMetrics } from "./metrics.js";
import { GlyfTable } from "./glyf.js";
import { IdentityCMap } from "./cmap.js";
import { OpenTypeFileBuilder } from "./opentype_file_builder.js";
import { readUint32 } from "./core_utils.js";
import { Stream } from "./stream.js";
import { Type1Font } from "./type1_font.js";
// Unicode Private Use Areas:
const PRIVATE_USE_AREAS = [
[0xe000, 0xf8ff], // BMP (0)
[0x100000, 0x10fffd], // PUP (16)
];
// PDF Glyph Space Units are one Thousandth of a TextSpace Unit
// except for Type 3 fonts
const PDF_GLYPH_SPACE_UNITS = 1000;
const EXPORT_DATA_PROPERTIES = [
"ascent",
"bbox",
"black",
"bold",
"charProcOperatorList",
"composite",
"cssFontInfo",
"data",
"defaultVMetrics",
"defaultWidth",
"descent",
"fallbackName",
"fontMatrix",
"isInvalidPDFjsFont",
"isType3Font",
"italic",
"loadedName",
"mimetype",
"missingFile",
"name",
"remeasure",
"subtype",
"systemFontInfo",
"type",
"vertical",
];
const EXPORT_DATA_EXTRA_PROPERTIES = [
"cMap",
"defaultEncoding",
"differences",
"isMonospace",
"isSerifFont",
"isSymbolicFont",
"seacMap",
"toFontChar",
"toUnicode",
"vmetrics",
"widths",
];
function adjustWidths(properties) {
if (!properties.fontMatrix) {
return;
}
if (properties.fontMatrix[0] === FONT_IDENTITY_MATRIX[0]) {
return;
}
// adjusting width to fontMatrix scale
const scale = 0.001 / properties.fontMatrix[0];
const glyphsWidths = properties.widths;
for (const glyph in glyphsWidths) {
glyphsWidths[glyph] *= scale;
}
properties.defaultWidth *= scale;
}
function adjustTrueTypeToUnicode(properties, isSymbolicFont, nameRecords) {
if (properties.isInternalFont) {
return;
}
if (properties.hasIncludedToUnicodeMap) {
return; // The font dictionary has a `ToUnicode` entry.
}
if (properties.hasEncoding) {
return; // The font dictionary has an `Encoding` entry.
}
if (properties.toUnicode instanceof IdentityToUnicodeMap) {
return;
}
if (!isSymbolicFont) {
return; // A non-symbolic font should default to `StandardEncoding`.
}
if (nameRecords.length === 0) {
return;
}
// Try to infer if the fallback encoding should really be `WinAnsiEncoding`.
if (properties.defaultEncoding === WinAnsiEncoding) {
return;
}
for (const r of nameRecords) {
if (!isWinNameRecord(r)) {
return; // Not Windows, hence `WinAnsiEncoding` wouldn't make sense.
}
}
const encoding = WinAnsiEncoding;
const toUnicode = [],
glyphsUnicodeMap = getGlyphsUnicode();
for (const charCode in encoding) {
const glyphName = encoding[charCode];
if (glyphName === "") {
continue;
}
const unicode = glyphsUnicodeMap[glyphName];
if (unicode === undefined) {
continue;
}
toUnicode[charCode] = String.fromCharCode(unicode);
}
if (toUnicode.length > 0) {
properties.toUnicode.amend(toUnicode);
}
}
function adjustType1ToUnicode(properties, builtInEncoding) {
if (properties.isInternalFont) {
return;
}
if (properties.hasIncludedToUnicodeMap) {
return; // The font dictionary has a `ToUnicode` entry.
}
if (builtInEncoding === properties.defaultEncoding) {
return; // No point in trying to adjust `toUnicode` if the encodings match.
}
if (properties.toUnicode instanceof IdentityToUnicodeMap) {
return;
}
const toUnicode = [],
glyphsUnicodeMap = getGlyphsUnicode();
for (const charCode in builtInEncoding) {
if (properties.hasEncoding) {
if (
properties.baseEncodingName ||
properties.differences[charCode] !== undefined
) {
continue; // The font dictionary has an `Encoding`/`Differences` entry.
}
}
const glyphName = builtInEncoding[charCode];
const unicode = getUnicodeForGlyph(glyphName, glyphsUnicodeMap);
if (unicode !== -1) {
toUnicode[charCode] = String.fromCharCode(unicode);
}
}
if (toUnicode.length > 0) {
properties.toUnicode.amend(toUnicode);
}
}
/**
* NOTE: This function should only be called at the *end* of font-parsing,
* after e.g. `adjustType1ToUnicode` has run, to prevent any issues.
*/
function amendFallbackToUnicode(properties) {
if (!properties.fallbackToUnicode) {
return;
}
if (properties.toUnicode instanceof IdentityToUnicodeMap) {
return;
}
const toUnicode = [];
for (const charCode in properties.fallbackToUnicode) {
if (properties.toUnicode.has(charCode)) {
continue; // The font dictionary has a `ToUnicode` entry.
}
toUnicode[charCode] = properties.fallbackToUnicode[charCode];
}
if (toUnicode.length > 0) {
properties.toUnicode.amend(toUnicode);
}
}
class Glyph {
constructor(
originalCharCode,
fontChar,
unicode,
accent,
width,
vmetric,
operatorListId,
isSpace,
isInFont
) {
this.originalCharCode = originalCharCode;
this.fontChar = fontChar;
this.unicode = unicode;
this.accent = accent;
this.width = width;
this.vmetric = vmetric;
this.operatorListId = operatorListId;
this.isSpace = isSpace;
this.isInFont = isInFont;
}
/**
* This property, which is only used by `PartialEvaluator.getTextContent`,
* is purposely made non-serializable.
* @type {Object}
*/
get category() {
return shadow(
this,
"category",
getCharUnicodeCategory(this.unicode),
/* nonSerializable = */ true
);
}
}
function int16(b0, b1) {
return (b0 << 8) + b1;
}
function writeSignedInt16(bytes, index, value) {
bytes[index + 1] = value;
bytes[index] = value >>> 8;
}
function signedInt16(b0, b1) {
const value = (b0 << 8) + b1;
return value & (1 << 15) ? value - 0x10000 : value;
}
function writeUint32(bytes, index, value) {
bytes[index + 3] = value & 0xff;
bytes[index + 2] = value >>> 8;
bytes[index + 1] = value >>> 16;
bytes[index] = value >>> 24;
}
function int32(b0, b1, b2, b3) {
return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3;
}
function string16(value) {
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
assert(
typeof value === "number" && Math.abs(value) < 2 ** 16,
`string16: Unexpected input "${value}".`
);
}
return String.fromCharCode((value >> 8) & 0xff, value & 0xff);
}
function safeString16(value) {
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
assert(
typeof value === "number" && !Number.isNaN(value),
`safeString16: Unexpected input "${value}".`
);
}
// clamp value to the 16-bit int range
if (value > 0x7fff) {
value = 0x7fff;
} else if (value < -0x8000) {
value = -0x8000;
}
return String.fromCharCode((value >> 8) & 0xff, value & 0xff);
}
function isTrueTypeFile(file) {
const header = file.peekBytes(4);
return (
readUint32(header, 0) === 0x00010000 || bytesToString(header) === "true"
);
}
function isTrueTypeCollectionFile(file) {
const header = file.peekBytes(4);
return bytesToString(header) === "ttcf";
}
function isOpenTypeFile(file) {
const header = file.peekBytes(4);
return bytesToString(header) === "OTTO";
}
function isType1File(file) {
const header = file.peekBytes(2);
// All Type1 font programs must begin with the comment '%!' (0x25 + 0x21).
if (header[0] === 0x25 && header[1] === 0x21) {
return true;
}
// ... obviously some fonts violate that part of the specification,
// please refer to the comment in |Type1Font| below (pfb file header).
if (header[0] === 0x80 && header[1] === 0x01) {
return true;
}
return false;
}
/**
* Compared to other font formats, the header in CFF files is not constant
* but contains version numbers. To reduce the possibility of misclassifying
* font files as CFF, it's recommended to check for other font formats first.
*/
function isCFFFile(file) {
const header = file.peekBytes(4);
if (
/* major version, [1, 255] */ header[0] >= 1 &&
/* minor version, [0, 255]; header[1] */
/* header size, [0, 255]; header[2] */
/* offset(0) size, [1, 4] */ header[3] >= 1 &&
header[3] <= 4
) {
return true;
}
return false;
}
function getFontFileType(file, { type, subtype, composite }) {
let fileType, fileSubtype;
if (isTrueTypeFile(file) || isTrueTypeCollectionFile(file)) {
fileType = composite ? "CIDFontType2" : "TrueType";
} else if (isOpenTypeFile(file)) {
fileType = composite ? "CIDFontType2" : "OpenType";
} else if (isType1File(file)) {
if (composite) {
fileType = "CIDFontType0";
} else {
fileType = type === "MMType1" ? "MMType1" : "Type1";
}
} else if (isCFFFile(file)) {
if (composite) {
fileType = "CIDFontType0";
fileSubtype = "CIDFontType0C";
} else {
fileType = type === "MMType1" ? "MMType1" : "Type1";
fileSubtype = "Type1C";
}
} else {
warn("getFontFileType: Unable to detect correct font file Type/Subtype.");
fileType = type;
fileSubtype = subtype;
}
return [fileType, fileSubtype];
}
function applyStandardFontGlyphMap(map, glyphMap) {
for (const charCode in glyphMap) {
map[+charCode] = glyphMap[charCode];
}
}
function buildToFontChar(encoding, glyphsUnicodeMap, differences) {
const toFontChar = [];
let unicode;
for (let i = 0, ii = encoding.length; i < ii; i++) {
unicode = getUnicodeForGlyph(encoding[i], glyphsUnicodeMap);
if (unicode !== -1) {
toFontChar[i] = unicode;
}
}
for (const charCode in differences) {
unicode = getUnicodeForGlyph(differences[charCode], glyphsUnicodeMap);
if (unicode !== -1) {
toFontChar[+charCode] = unicode;
}
}
return toFontChar;
}
// Please refer to:
// - https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6name.html
function isMacNameRecord(r) {
return r.platform === 1 && r.encoding === 0 && r.language === 0;
}
// Please refer to:
// - https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6name.html
// - https://learn.microsoft.com/en-us/typography/opentype/spec/name#windows-language-ids
function isWinNameRecord(r) {
return r.platform === 3 && r.encoding === 1 && r.language === 0x409;
}
function convertCidString(charCode, cid, shouldThrow = false) {
switch (cid.length) {
case 1:
return cid.charCodeAt(0);
case 2:
return (cid.charCodeAt(0) << 8) | cid.charCodeAt(1);
}
const msg = `Unsupported CID string (charCode ${charCode}): "${cid}".`;
if (shouldThrow) {
throw new FormatError(msg);
}
warn(msg);
return cid;
}
/**
* Rebuilds the char code to glyph ID map by moving all char codes to the
* private use area. This is done to avoid issues with various problematic
* unicode areas where either a glyph won't be drawn or is deformed by a
* shaper.
* @returns {Object} Two properties:
* 'toFontChar' - maps original char codes(the value that will be read
* from commands such as show text) to the char codes that will be used in the
* font that we build
* 'charCodeToGlyphId' - maps the new font char codes to glyph ids
*/
function adjustMapping(charCodeToGlyphId, hasGlyph, newGlyphZeroId, toUnicode) {
const newMap = Object.create(null);
const toUnicodeExtraMap = new Map();
const toFontChar = [];
const usedGlyphIds = new Set();
let privateUseAreaIndex = 0;
const privateUseOffetStart = PRIVATE_USE_AREAS[privateUseAreaIndex][0];
let nextAvailableFontCharCode = privateUseOffetStart;
let privateUseOffetEnd = PRIVATE_USE_AREAS[privateUseAreaIndex][1];
const isInPrivateArea = code =>
(PRIVATE_USE_AREAS[0][0] <= code && code <= PRIVATE_USE_AREAS[0][1]) ||
(PRIVATE_USE_AREAS[1][0] <= code && code <= PRIVATE_USE_AREAS[1][1]);
for (const originalCharCode in charCodeToGlyphId) {
let glyphId = charCodeToGlyphId[originalCharCode];
// For missing glyphs don't create the mappings so the glyph isn't
// drawn.
if (!hasGlyph(glyphId)) {
continue;
}
if (nextAvailableFontCharCode > privateUseOffetEnd) {
privateUseAreaIndex++;
if (privateUseAreaIndex >= PRIVATE_USE_AREAS.length) {
warn("Ran out of space in font private use area.");
break;
}
nextAvailableFontCharCode = PRIVATE_USE_AREAS[privateUseAreaIndex][0];
privateUseOffetEnd = PRIVATE_USE_AREAS[privateUseAreaIndex][1];
}
const fontCharCode = nextAvailableFontCharCode++;
if (glyphId === 0) {
glyphId = newGlyphZeroId;
}
// Fix for bug 1778484:
// The charcodes are moved into a private use area to fix some rendering
// issues (https://github.com/mozilla/pdf.js/pull/9340) but when printing
// to PDF the generated font will contain wrong chars. We can avoid that by
// adding the unicode to the cmap and the print backend will then map the
// glyph ids to the correct unicode.
let unicode = toUnicode.get(originalCharCode);
if (typeof unicode === "string") {
unicode = unicode.codePointAt(0);
}
if (unicode && !isInPrivateArea(unicode) && !usedGlyphIds.has(glyphId)) {
toUnicodeExtraMap.set(unicode, glyphId);
usedGlyphIds.add(glyphId);
}
newMap[fontCharCode] = glyphId;
toFontChar[originalCharCode] = fontCharCode;
}
return {
toFontChar,
charCodeToGlyphId: newMap,
toUnicodeExtraMap,
nextAvailableFontCharCode,
};
}
function getRanges(glyphs, toUnicodeExtraMap, numGlyphs) {
// Array.sort() sorts by characters, not numerically, so convert to an
// array of characters.
const codes = [];
for (const charCode in glyphs) {
// Remove an invalid glyph ID mappings to make OTS happy.
if (glyphs[charCode] >= numGlyphs) {
continue;
}
codes.push({ fontCharCode: charCode | 0, glyphId: glyphs[charCode] });
}
if (toUnicodeExtraMap) {
for (const [unicode, glyphId] of toUnicodeExtraMap) {
if (glyphId >= numGlyphs) {
continue;
}
codes.push({ fontCharCode: unicode, glyphId });
}
}
// Some fonts have zero glyphs and are used only for text selection, but
// there needs to be at least one to build a valid cmap table.
if (codes.length === 0) {
codes.push({ fontCharCode: 0, glyphId: 0 });
}
codes.sort(function fontGetRangesSort(a, b) {
return a.fontCharCode - b.fontCharCode;
});
// Split the sorted codes into ranges.
const ranges = [];
const length = codes.length;
for (let n = 0; n < length; ) {
const start = codes[n].fontCharCode;
const codeIndices = [codes[n].glyphId];
++n;
let end = start;
while (n < length && end + 1 === codes[n].fontCharCode) {
codeIndices.push(codes[n].glyphId);
++end;
++n;
if (end === 0xffff) {
break;
}
}
ranges.push([start, end, codeIndices]);
}
return ranges;
}
function createCmapTable(glyphs, toUnicodeExtraMap, numGlyphs) {
const ranges = getRanges(glyphs, toUnicodeExtraMap, numGlyphs);
const numTables = ranges.at(-1)[1] > 0xffff ? 2 : 1;
let cmap =
"\x00\x00" + // version
string16(numTables) + // numTables
"\x00\x03" + // platformID
"\x00\x01" + // encodingID
string32(4 + numTables * 8); // start of the table record
let i, ii, j, jj;
for (i = ranges.length - 1; i >= 0; --i) {
if (ranges[i][0] <= 0xffff) {
break;
}
}
const bmpLength = i + 1;
if (ranges[i][0] < 0xffff && ranges[i][1] === 0xffff) {
ranges[i][1] = 0xfffe;
}
const trailingRangesCount = ranges[i][1] < 0xffff ? 1 : 0;
const segCount = bmpLength + trailingRangesCount;
const searchParams = OpenTypeFileBuilder.getSearchParams(segCount, 2);
// Fill up the 4 parallel arrays describing the segments.
let startCount = "";
let endCount = "";
let idDeltas = "";
let idRangeOffsets = "";
let glyphsIds = "";
let bias = 0;
let range, start, end, codes;
for (i = 0, ii = bmpLength; i < ii; i++) {
range = ranges[i];
start = range[0];
end = range[1];
startCount += string16(start);
endCount += string16(end);
codes = range[2];
let contiguous = true;
for (j = 1, jj = codes.length; j < jj; ++j) {
if (codes[j] !== codes[j - 1] + 1) {
contiguous = false;
break;
}
}
if (!contiguous) {
const offset = (segCount - i) * 2 + bias * 2;
bias += end - start + 1;
idDeltas += string16(0);
idRangeOffsets += string16(offset);
for (j = 0, jj = codes.length; j < jj; ++j) {
glyphsIds += string16(codes[j]);
}
} else {
const startCode = codes[0];
idDeltas += string16((startCode - start) & 0xffff);
idRangeOffsets += string16(0);
}
}
if (trailingRangesCount > 0) {
endCount += "\xFF\xFF";
startCount += "\xFF\xFF";
idDeltas += "\x00\x01";
idRangeOffsets += "\x00\x00";
}
const format314 =
"\x00\x00" + // language
string16(2 * segCount) +
string16(searchParams.range) +
string16(searchParams.entry) +
string16(searchParams.rangeShift) +
endCount +
"\x00\x00" +
startCount +
idDeltas +
idRangeOffsets +
glyphsIds;
let format31012 = "";
let header31012 = "";
if (numTables > 1) {
cmap +=
"\x00\x03" + // platformID
"\x00\x0A" + // encodingID
string32(4 + numTables * 8 + 4 + format314.length); // start of the table record
format31012 = "";
for (i = 0, ii = ranges.length; i < ii; i++) {
range = ranges[i];
start = range[0];
codes = range[2];
let code = codes[0];
for (j = 1, jj = codes.length; j < jj; ++j) {
if (codes[j] !== codes[j - 1] + 1) {
end = range[0] + j - 1;
format31012 +=
string32(start) + // startCharCode
string32(end) + // endCharCode
string32(code); // startGlyphID
start = end + 1;
code = codes[j];
}
}
format31012 +=
string32(start) + // startCharCode
string32(range[1]) + // endCharCode
string32(code); // startGlyphID
}
header31012 =
"\x00\x0C" + // format
"\x00\x00" + // reserved
string32(format31012.length + 16) + // length
"\x00\x00\x00\x00" + // language
string32(format31012.length / 12); // nGroups
}
return (
cmap +
"\x00\x04" + // format
string16(format314.length + 4) + // length
format314 +
header31012 +
format31012
);
}
function validateOS2Table(os2, file) {
file.pos = (file.start || 0) + os2.offset;
const version = file.getUint16();
// TODO verify all OS/2 tables fields, but currently we validate only those
// that give us issues
file.skip(60); // skipping type, misc sizes, panose, unicode ranges
const selection = file.getUint16();
if (version < 4 && selection & 0x0300) {
return false;
}
const firstChar = file.getUint16();
const lastChar = file.getUint16();
if (firstChar > lastChar) {
return false;
}
file.skip(6); // skipping sTypoAscender/Descender/LineGap
const usWinAscent = file.getUint16();
if (usWinAscent === 0) {
// makes font unreadable by windows
return false;
}
// OS/2 appears to be valid, resetting some fields
os2.data[8] = os2.data[9] = 0; // IE rejects fonts if fsType != 0
return true;
}
function createOS2Table(properties, charstrings, override) {
override ||= {
unitsPerEm: 0,
yMax: 0,
yMin: 0,
ascent: 0,
descent: 0,
};
let ulUnicodeRange1 = 0;
let ulUnicodeRange2 = 0;
let ulUnicodeRange3 = 0;
let ulUnicodeRange4 = 0;
let firstCharIndex = null;
let lastCharIndex = 0;
let position = -1;
if (charstrings) {
for (let code in charstrings) {
code |= 0;
if (firstCharIndex > code || !firstCharIndex) {
firstCharIndex = code;
}
if (lastCharIndex < code) {
lastCharIndex = code;
}
position = getUnicodeRangeFor(code, position);
if (position < 32) {
ulUnicodeRange1 |= 1 << position;
} else if (position < 64) {
ulUnicodeRange2 |= 1 << (position - 32);
} else if (position < 96) {
ulUnicodeRange3 |= 1 << (position - 64);
} else if (position < 123) {
ulUnicodeRange4 |= 1 << (position - 96);
} else {
throw new FormatError(
"Unicode ranges Bits > 123 are reserved for internal usage"
);
}
}
if (lastCharIndex > 0xffff) {
// OS2 only supports a 16 bit int. The spec says if supplementary
// characters are used the field should just be set to 0xFFFF.
lastCharIndex = 0xffff;
}
} else {
// TODO
firstCharIndex = 0;
lastCharIndex = 255;
}
const bbox = properties.bbox || [0, 0, 0, 0];
const unitsPerEm =
override.unitsPerEm ||
(properties.fontMatrix
? 1 / Math.max(...properties.fontMatrix.slice(0, 4).map(Math.abs))
: 1000);
// if the font units differ to the PDF glyph space units
// then scale up the values
const scale = properties.ascentScaled
? 1.0
: unitsPerEm / PDF_GLYPH_SPACE_UNITS;
const typoAscent =
override.ascent || Math.round(scale * (properties.ascent || bbox[3]));
let typoDescent =
override.descent || Math.round(scale * (properties.descent || bbox[1]));
if (typoDescent > 0 && properties.descent > 0 && bbox[1] < 0) {
typoDescent = -typoDescent; // fixing incorrect descent
}
const winAscent = override.yMax || typoAscent;
const winDescent = -override.yMin || -typoDescent;
return (
"\x00\x03" + // version
"\x02\x24" + // xAvgCharWidth
"\x01\xF4" + // usWeightClass
"\x00\x05" + // usWidthClass
"\x00\x00" + // fstype (0 to let the font loads via font-face on IE)
"\x02\x8A" + // ySubscriptXSize
"\x02\xBB" + // ySubscriptYSize
"\x00\x00" + // ySubscriptXOffset
"\x00\x8C" + // ySubscriptYOffset
"\x02\x8A" + // ySuperScriptXSize
"\x02\xBB" + // ySuperScriptYSize
"\x00\x00" + // ySuperScriptXOffset
"\x01\xDF" + // ySuperScriptYOffset
"\x00\x31" + // yStrikeOutSize
"\x01\x02" + // yStrikeOutPosition
"\x00\x00" + // sFamilyClass
"\x00\x00\x06" +
String.fromCharCode(properties.fixedPitch ? 0x09 : 0x00) +
"\x00\x00\x00\x00\x00\x00" + // Panose
string32(ulUnicodeRange1) + // ulUnicodeRange1 (Bits 0-31)
string32(ulUnicodeRange2) + // ulUnicodeRange2 (Bits 32-63)
string32(ulUnicodeRange3) + // ulUnicodeRange3 (Bits 64-95)
string32(ulUnicodeRange4) + // ulUnicodeRange4 (Bits 96-127)
"\x2A\x32\x31\x2A" + // achVendID
string16(properties.italicAngle ? 1 : 0) + // fsSelection
string16(firstCharIndex || properties.firstChar) + // usFirstCharIndex
string16(lastCharIndex || properties.lastChar) + // usLastCharIndex
string16(typoAscent) + // sTypoAscender
string16(typoDescent) + // sTypoDescender
"\x00\x64" + // sTypoLineGap (7%-10% of the unitsPerEM value)
string16(winAscent) + // usWinAscent
string16(winDescent) + // usWinDescent
"\x00\x00\x00\x00" + // ulCodePageRange1 (Bits 0-31)
"\x00\x00\x00\x00" + // ulCodePageRange2 (Bits 32-63)
string16(properties.xHeight) + // sxHeight
string16(properties.capHeight) + // sCapHeight
string16(0) + // usDefaultChar
string16(firstCharIndex || properties.firstChar) + // usBreakChar
"\x00\x03"
); // usMaxContext
}
function createPostTable(properties) {
const angle = Math.floor(properties.italicAngle * 2 ** 16);
return (
"\x00\x03\x00\x00" + // Version number
string32(angle) + // italicAngle
"\x00\x00" + // underlinePosition
"\x00\x00" + // underlineThickness
string32(properties.fixedPitch ? 1 : 0) + // isFixedPitch
"\x00\x00\x00\x00" + // minMemType42
"\x00\x00\x00\x00" + // maxMemType42
"\x00\x00\x00\x00" + // minMemType1
"\x00\x00\x00\x00"
); // maxMemType1
}
function createPostscriptName(name) {
// See https://docs.microsoft.com/en-us/typography/opentype/spec/recom#name.
return name.replaceAll(/[^\x21-\x7E]|[[\](){}<>/%]/g, "").slice(0, 63);
}
function createNameTable(name, proto) {
if (!proto) {
proto = [[], []]; // no strings and unicode strings
}
const strings = [
proto[0][0] || "Original licence", // 0.Copyright
proto[0][1] || name, // 1.Font family
proto[0][2] || "Unknown", // 2.Font subfamily (font weight)
proto[0][3] || "uniqueID", // 3.Unique ID
proto[0][4] || name, // 4.Full font name
proto[0][5] || "Version 0.11", // 5.Version
proto[0][6] || createPostscriptName(name), // 6.Postscript name
proto[0][7] || "Unknown", // 7.Trademark
proto[0][8] || "Unknown", // 8.Manufacturer
proto[0][9] || "Unknown", // 9.Designer
];
// Mac want 1-byte per character strings while Windows want
// 2-bytes per character, so duplicate the names table
const stringsUnicode = [];
let i, ii, j, jj, str;
for (i = 0, ii = strings.length; i < ii; i++) {
str = proto[1][i] || strings[i];
const strBufUnicode = [];
for (j = 0, jj = str.length; j < jj; j++) {
strBufUnicode.push(string16(str.charCodeAt(j)));
}
stringsUnicode.push(strBufUnicode.join(""));
}
const names = [strings, stringsUnicode];
const platforms = ["\x00\x01", "\x00\x03"];
const encodings = ["\x00\x00", "\x00\x01"];
const languages = ["\x00\x00", "\x04\x09"];
const namesRecordCount = strings.length * platforms.length;
let nameTable =
"\x00\x00" + // format
string16(namesRecordCount) + // Number of names Record
string16(namesRecordCount * 12 + 6); // Storage
// Build the name records field
let strOffset = 0;
for (i = 0, ii = platforms.length; i < ii; i++) {
const strs = names[i];
for (j = 0, jj = strs.length; j < jj; j++) {
str = strs[j];
const nameRecord =
platforms[i] + // platform ID
encodings[i] + // encoding ID
languages[i] + // language ID
string16(j) + // name ID
string16(str.length) +
string16(strOffset);
nameTable += nameRecord;
strOffset += str.length;
}
}
nameTable += strings.join("") + stringsUnicode.join("");
return nameTable;
}
/**
* 'Font' is the class the outside world should use, it encapsulate all the font
* decoding logics whatever type it is (assuming the font type is supported).
*/
class Font {
constructor(name, file, properties) {
this.name = name;
this.psName = null;
this.mimetype = null;
this.disableFontFace = false;
this.loadedName = properties.loadedName;
this.isType3Font = properties.isType3Font;
this.missingFile = false;
this.cssFontInfo = properties.cssFontInfo;
this._charsCache = Object.create(null);
this._glyphCache = Object.create(null);
let isSerifFont = !!(properties.flags & FontFlags.Serif);
// Fallback to checking the font name, in order to improve text-selection,
// since the /Flags-entry is often wrong (fixes issue13845.pdf).
if (!isSerifFont && !properties.isSimulatedFlags) {
const baseName = name.replaceAll(/[,_]/g, "-").split("-", 1)[0],
serifFonts = getSerifFonts();
for (const namePart of baseName.split("+")) {
if (serifFonts[namePart]) {
isSerifFont = true;
break;
}
}
}
this.isSerifFont = isSerifFont;
this.isSymbolicFont = !!(properties.flags & FontFlags.Symbolic);
this.isMonospace = !!(properties.flags & FontFlags.FixedPitch);
let { type, subtype } = properties;
this.type = type;
this.subtype = subtype;
this.systemFontInfo = properties.systemFontInfo;
const matches = name.match(/^InvalidPDFjsFont_(.*)_\d+$/);
this.isInvalidPDFjsFont = !!matches;
if (this.isInvalidPDFjsFont) {
this.fallbackName = matches[1];
} else if (this.isMonospace) {
this.fallbackName = "monospace";
} else if (this.isSerifFont) {
this.fallbackName = "serif";
} else {