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pdf.js/src/core/font_renderer.js
Brendan Dahl b76cf665ec Map all glyphs to the private use area and duplicate the first glyph. 
There have been lots of problems with trying to map glyphs to their unicode
values. It's more reliable to just use the private use areas so the browser's
font renderer doesn't mess with the glyphs.

Using the private use area for all glyphs did highlight other issues that this
patch also had to fix:

  * small private use area - Previously, only the BMP private use area was used
    which can't map many glyphs. Now, the (much bigger) PUP 16 area can also be
    used.

  * glyph zero not shown - Browsers will not use the glyph from a font if it is
    glyph id = 0. This issue was less prevalent when we mapped to unicode values
    since the fallback font would be used. However, when using the private use
    area, the glyph would not be drawn at all. This is illustrated in one of the
    current test cases (issue #8234) where there's an "ä" glyph at position
    zero. The PDF looked like it rendered correctly, but it was actually not
    using the glyph from the font. To properly show the first glyph it is always
    duplicated and appended to the glyphs and the maps are adjusted.

  * supplementary characters - The private use area PUP 16 is 4 bytes, so
    String.fromCodePoint must be used where we previously used
    String.fromCharCode. This is actually an issue that should have been fixed
    regardless of this patch.

  * charset - Freetype fails to load fonts when the charset size doesn't match
    number of glyphs in the font. We now write out a fake charset with the
    correct length. This also brought up the issue that glyphs with seac/endchar
    should only ever write a standard charset, but we now write a custom one.
    To get around this the seac analysis is permanently enabled so those glyphs
    are instead always drawn as two glyphs.
2018-09-05 14:04:54 -07:00

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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 {
bytesToString, FONT_IDENTITY_MATRIX, FormatError, unreachable, warn
} from '../shared/util';
import { CFFParser } from './cff_parser';
import { getGlyphsUnicode } from './glyphlist';
import { StandardEncoding } from './encodings';
import { Stream } from './stream';
var FontRendererFactory = (function FontRendererFactoryClosure() {
function getLong(data, offset) {
return (data[offset] << 24) | (data[offset + 1] << 16) |
(data[offset + 2] << 8) | data[offset + 3];
}
function getUshort(data, offset) {
return (data[offset] << 8) | data[offset + 1];
}
function parseCmap(data, start, end) {
var offset = (getUshort(data, start + 2) === 1 ?
getLong(data, start + 8) : getLong(data, start + 16));
var format = getUshort(data, start + offset);
var ranges, p, i;
if (format === 4) {
getUshort(data, start + offset + 2); // length
var segCount = getUshort(data, start + offset + 6) >> 1;
p = start + offset + 14;
ranges = [];
for (i = 0; i < segCount; i++, p += 2) {
ranges[i] = { end: getUshort(data, p), };
}
p += 2;
for (i = 0; i < segCount; i++, p += 2) {
ranges[i].start = getUshort(data, p);
}
for (i = 0; i < segCount; i++, p += 2) {
ranges[i].idDelta = getUshort(data, p);
}
for (i = 0; i < segCount; i++, p += 2) {
var idOffset = getUshort(data, p);
if (idOffset === 0) {
continue;
}
ranges[i].ids = [];
for (var j = 0, jj = ranges[i].end - ranges[i].start + 1; j < jj; j++) {
ranges[i].ids[j] = getUshort(data, p + idOffset);
idOffset += 2;
}
}
return ranges;
} else if (format === 12) {
getLong(data, start + offset + 4); // length
var groups = getLong(data, start + offset + 12);
p = start + offset + 16;
ranges = [];
for (i = 0; i < groups; i++) {
ranges.push({
start: getLong(data, p),
end: getLong(data, p + 4),
idDelta: getLong(data, p + 8) - getLong(data, p),
});
p += 12;
}
return ranges;
}
throw new FormatError(`unsupported cmap: ${format}`);
}
function parseCff(data, start, end, seacAnalysisEnabled) {
var properties = {};
var parser = new CFFParser(new Stream(data, start, end - start),
properties, seacAnalysisEnabled);
var cff = parser.parse();
return {
glyphs: cff.charStrings.objects,
subrs: (cff.topDict.privateDict && cff.topDict.privateDict.subrsIndex &&
cff.topDict.privateDict.subrsIndex.objects),
gsubrs: cff.globalSubrIndex && cff.globalSubrIndex.objects,
isCFFCIDFont: cff.isCIDFont,
fdSelect: cff.fdSelect,
fdArray: cff.fdArray,
};
}
function parseGlyfTable(glyf, loca, isGlyphLocationsLong) {
var itemSize, itemDecode;
if (isGlyphLocationsLong) {
itemSize = 4;
itemDecode = function fontItemDecodeLong(data, offset) {
return (data[offset] << 24) | (data[offset + 1] << 16) |
(data[offset + 2] << 8) | data[offset + 3];
};
} else {
itemSize = 2;
itemDecode = function fontItemDecode(data, offset) {
return (data[offset] << 9) | (data[offset + 1] << 1);
};
}
var glyphs = [];
var startOffset = itemDecode(loca, 0);
for (var j = itemSize; j < loca.length; j += itemSize) {
var endOffset = itemDecode(loca, j);
glyphs.push(glyf.subarray(startOffset, endOffset));
startOffset = endOffset;
}
return glyphs;
}
function lookupCmap(ranges, unicode) {
var code = unicode.codePointAt(0), gid = 0;
var l = 0, r = ranges.length - 1;
while (l < r) {
var c = (l + r + 1) >> 1;
if (code < ranges[c].start) {
r = c - 1;
} else {
l = c;
}
}
if (ranges[l].start <= code && code <= ranges[l].end) {
gid = (ranges[l].idDelta + (ranges[l].ids ?
ranges[l].ids[code - ranges[l].start] : code)) & 0xFFFF;
}
return {
charCode: code,
glyphId: gid,
};
}
function compileGlyf(code, cmds, font) {
function moveTo(x, y) {
cmds.push({ cmd: 'moveTo', args: [x, y], });
}
function lineTo(x, y) {
cmds.push({ cmd: 'lineTo', args: [x, y], });
}
function quadraticCurveTo(xa, ya, x, y) {
cmds.push({ cmd: 'quadraticCurveTo', args: [xa, ya, x, y], });
}
var i = 0;
var numberOfContours = ((code[i] << 24) | (code[i + 1] << 16)) >> 16;
var flags;
var x = 0, y = 0;
i += 10;
if (numberOfContours < 0) {
// composite glyph
do {
flags = (code[i] << 8) | code[i + 1];
var glyphIndex = (code[i + 2] << 8) | code[i + 3];
i += 4;
var arg1, arg2;
if ((flags & 0x01)) {
arg1 = ((code[i] << 24) | (code[i + 1] << 16)) >> 16;
arg2 = ((code[i + 2] << 24) | (code[i + 3] << 16)) >> 16;
i += 4;
} else {
arg1 = code[i++]; arg2 = code[i++];
}
if ((flags & 0x02)) {
x = arg1;
y = arg2;
} else {
x = 0; y = 0; // TODO "they are points" ?
}
var scaleX = 1, scaleY = 1, scale01 = 0, scale10 = 0;
if ((flags & 0x08)) {
scaleX =
scaleY = ((code[i] << 24) | (code[i + 1] << 16)) / 1073741824;
i += 2;
} else if ((flags & 0x40)) {
scaleX = ((code[i] << 24) | (code[i + 1] << 16)) / 1073741824;
scaleY = ((code[i + 2] << 24) | (code[i + 3] << 16)) / 1073741824;
i += 4;
} else if ((flags & 0x80)) {
scaleX = ((code[i] << 24) | (code[i + 1] << 16)) / 1073741824;
scale01 = ((code[i + 2] << 24) | (code[i + 3] << 16)) / 1073741824;
scale10 = ((code[i + 4] << 24) | (code[i + 5] << 16)) / 1073741824;
scaleY = ((code[i + 6] << 24) | (code[i + 7] << 16)) / 1073741824;
i += 8;
}
var subglyph = font.glyphs[glyphIndex];
if (subglyph) {
cmds.push({ cmd: 'save', });
cmds.push({ cmd: 'transform',
args: [scaleX, scale01, scale10, scaleY, x, y], });
compileGlyf(subglyph, cmds, font);
cmds.push({ cmd: 'restore', });
}
} while ((flags & 0x20));
} else {
// simple glyph
var endPtsOfContours = [];
var j, jj;
for (j = 0; j < numberOfContours; j++) {
endPtsOfContours.push((code[i] << 8) | code[i + 1]);
i += 2;
}
var instructionLength = (code[i] << 8) | code[i + 1];
i += 2 + instructionLength; // skipping the instructions
var numberOfPoints = endPtsOfContours[endPtsOfContours.length - 1] + 1;
var points = [];
while (points.length < numberOfPoints) {
flags = code[i++];
var repeat = 1;
if ((flags & 0x08)) {
repeat += code[i++];
}
while (repeat-- > 0) {
points.push({ flags, });
}
}
for (j = 0; j < numberOfPoints; j++) {
switch (points[j].flags & 0x12) {
case 0x00:
x += ((code[i] << 24) | (code[i + 1] << 16)) >> 16;
i += 2;
break;
case 0x02:
x -= code[i++];
break;
case 0x12:
x += code[i++];
break;
}
points[j].x = x;
}
for (j = 0; j < numberOfPoints; j++) {
switch (points[j].flags & 0x24) {
case 0x00:
y += ((code[i] << 24) | (code[i + 1] << 16)) >> 16;
i += 2;
break;
case 0x04:
y -= code[i++];
break;
case 0x24:
y += code[i++];
break;
}
points[j].y = y;
}
var startPoint = 0;
for (i = 0; i < numberOfContours; i++) {
var endPoint = endPtsOfContours[i];
// contours might have implicit points, which is located in the middle
// between two neighboring off-curve points
var contour = points.slice(startPoint, endPoint + 1);
if ((contour[0].flags & 1)) {
contour.push(contour[0]); // using start point at the contour end
} else if ((contour[contour.length - 1].flags & 1)) {
// first is off-curve point, trying to use one from the end
contour.unshift(contour[contour.length - 1]);
} else {
// start and end are off-curve points, creating implicit one
var p = {
flags: 1,
x: (contour[0].x + contour[contour.length - 1].x) / 2,
y: (contour[0].y + contour[contour.length - 1].y) / 2,
};
contour.unshift(p);
contour.push(p);
}
moveTo(contour[0].x, contour[0].y);
for (j = 1, jj = contour.length; j < jj; j++) {
if ((contour[j].flags & 1)) {
lineTo(contour[j].x, contour[j].y);
} else if ((contour[j + 1].flags & 1)) {
quadraticCurveTo(contour[j].x, contour[j].y,
contour[j + 1].x, contour[j + 1].y);
j++;
} else {
quadraticCurveTo(contour[j].x, contour[j].y,
(contour[j].x + contour[j + 1].x) / 2,
(contour[j].y + contour[j + 1].y) / 2);
}
}
startPoint = endPoint + 1;
}
}
}
function compileCharString(code, cmds, font, glyphId) {
var stack = [];
var x = 0, y = 0;
var stems = 0;
function moveTo(x, y) {
cmds.push({ cmd: 'moveTo', args: [x, y], });
}
function lineTo(x, y) {
cmds.push({ cmd: 'lineTo', args: [x, y], });
}
function bezierCurveTo(x1, y1, x2, y2, x, y) {
cmds.push({ cmd: 'bezierCurveTo', args: [x1, y1, x2, y2, x, y], });
}
function parse(code) {
var i = 0;
while (i < code.length) {
var stackClean = false;
var v = code[i++];
var xa, xb, ya, yb, y1, y2, y3, n, subrCode;
switch (v) {
case 1: // hstem
stems += stack.length >> 1;
stackClean = true;
break;
case 3: // vstem
stems += stack.length >> 1;
stackClean = true;
break;
case 4: // vmoveto
y += stack.pop();
moveTo(x, y);
stackClean = true;
break;
case 5: // rlineto
while (stack.length > 0) {
x += stack.shift();
y += stack.shift();
lineTo(x, y);
}
break;
case 6: // hlineto
while (stack.length > 0) {
x += stack.shift();
lineTo(x, y);
if (stack.length === 0) {
break;
}
y += stack.shift();
lineTo(x, y);
}
break;
case 7: // vlineto
while (stack.length > 0) {
y += stack.shift();
lineTo(x, y);
if (stack.length === 0) {
break;
}
x += stack.shift();
lineTo(x, y);
}
break;
case 8: // rrcurveto
while (stack.length > 0) {
xa = x + stack.shift(); ya = y + stack.shift();
xb = xa + stack.shift(); yb = ya + stack.shift();
x = xb + stack.shift(); y = yb + stack.shift();
bezierCurveTo(xa, ya, xb, yb, x, y);
}
break;
case 10: // callsubr
n = stack.pop();
subrCode = null;
if (font.isCFFCIDFont) {
let fdIndex = font.fdSelect.getFDIndex(glyphId);
if (fdIndex >= 0 && fdIndex < font.fdArray.length) {
let fontDict = font.fdArray[fdIndex], subrs;
if (fontDict.privateDict && fontDict.privateDict.subrsIndex) {
subrs = fontDict.privateDict.subrsIndex.objects;
}
if (subrs) {
let numSubrs = subrs.length;
// Add subroutine bias.
n += numSubrs < 1240 ? 107 :
(numSubrs < 33900 ? 1131 : 32768);
subrCode = subrs[n];
}
} else {
warn('Invalid fd index for glyph index.');
}
} else {
subrCode = font.subrs[n + font.subrsBias];
}
if (subrCode) {
parse(subrCode);
}
break;
case 11: // return
return;
case 12:
v = code[i++];
switch (v) {
case 34: // flex
xa = x + stack.shift();
xb = xa + stack.shift(); y1 = y + stack.shift();
x = xb + stack.shift();
bezierCurveTo(xa, y, xb, y1, x, y1);
xa = x + stack.shift();
xb = xa + stack.shift();
x = xb + stack.shift();
bezierCurveTo(xa, y1, xb, y, x, y);
break;
case 35: // flex
xa = x + stack.shift(); ya = y + stack.shift();
xb = xa + stack.shift(); yb = ya + stack.shift();
x = xb + stack.shift(); y = yb + stack.shift();
bezierCurveTo(xa, ya, xb, yb, x, y);
xa = x + stack.shift(); ya = y + stack.shift();
xb = xa + stack.shift(); yb = ya + stack.shift();
x = xb + stack.shift(); y = yb + stack.shift();
bezierCurveTo(xa, ya, xb, yb, x, y);
stack.pop(); // fd
break;
case 36: // hflex1
xa = x + stack.shift(); y1 = y + stack.shift();
xb = xa + stack.shift(); y2 = y1 + stack.shift();
x = xb + stack.shift();
bezierCurveTo(xa, y1, xb, y2, x, y2);
xa = x + stack.shift();
xb = xa + stack.shift(); y3 = y2 + stack.shift();
x = xb + stack.shift();
bezierCurveTo(xa, y2, xb, y3, x, y);
break;
case 37: // flex1
var x0 = x, y0 = y;
xa = x + stack.shift(); ya = y + stack.shift();
xb = xa + stack.shift(); yb = ya + stack.shift();
x = xb + stack.shift(); y = yb + stack.shift();
bezierCurveTo(xa, ya, xb, yb, x, y);
xa = x + stack.shift(); ya = y + stack.shift();
xb = xa + stack.shift(); yb = ya + stack.shift();
x = xb; y = yb;
if (Math.abs(x - x0) > Math.abs(y - y0)) {
x += stack.shift();
} else {
y += stack.shift();
}
bezierCurveTo(xa, ya, xb, yb, x, y);
break;
default:
throw new FormatError(`unknown operator: 12 ${v}`);
}
break;
case 14: // endchar
if (stack.length >= 4) {
var achar = stack.pop();
var bchar = stack.pop();
y = stack.pop();
x = stack.pop();
cmds.push({ cmd: 'save', });
cmds.push({ cmd: 'translate', args: [x, y], });
var cmap = lookupCmap(font.cmap, String.fromCharCode(
font.glyphNameMap[StandardEncoding[achar]]));
compileCharString(font.glyphs[cmap.glyphId], cmds, font,
cmap.glyphId);
cmds.push({ cmd: 'restore', });
cmap = lookupCmap(font.cmap, String.fromCharCode(
font.glyphNameMap[StandardEncoding[bchar]]));
compileCharString(font.glyphs[cmap.glyphId], cmds, font,
cmap.glyphId);
}
return;
case 18: // hstemhm
stems += stack.length >> 1;
stackClean = true;
break;
case 19: // hintmask
stems += stack.length >> 1;
i += (stems + 7) >> 3;
stackClean = true;
break;
case 20: // cntrmask
stems += stack.length >> 1;
i += (stems + 7) >> 3;
stackClean = true;
break;
case 21: // rmoveto
y += stack.pop();
x += stack.pop();
moveTo(x, y);
stackClean = true;
break;
case 22: // hmoveto
x += stack.pop();
moveTo(x, y);
stackClean = true;
break;
case 23: // vstemhm
stems += stack.length >> 1;
stackClean = true;
break;
case 24: // rcurveline
while (stack.length > 2) {
xa = x + stack.shift(); ya = y + stack.shift();
xb = xa + stack.shift(); yb = ya + stack.shift();
x = xb + stack.shift(); y = yb + stack.shift();
bezierCurveTo(xa, ya, xb, yb, x, y);
}
x += stack.shift();
y += stack.shift();
lineTo(x, y);
break;
case 25: // rlinecurve
while (stack.length > 6) {
x += stack.shift();
y += stack.shift();
lineTo(x, y);
}
xa = x + stack.shift(); ya = y + stack.shift();
xb = xa + stack.shift(); yb = ya + stack.shift();
x = xb + stack.shift(); y = yb + stack.shift();
bezierCurveTo(xa, ya, xb, yb, x, y);
break;
case 26: // vvcurveto
if (stack.length % 2) {
x += stack.shift();
}
while (stack.length > 0) {
xa = x; ya = y + stack.shift();
xb = xa + stack.shift(); yb = ya + stack.shift();
x = xb; y = yb + stack.shift();
bezierCurveTo(xa, ya, xb, yb, x, y);
}
break;
case 27: // hhcurveto
if (stack.length % 2) {
y += stack.shift();
}
while (stack.length > 0) {
xa = x + stack.shift(); ya = y;
xb = xa + stack.shift(); yb = ya + stack.shift();
x = xb + stack.shift(); y = yb;
bezierCurveTo(xa, ya, xb, yb, x, y);
}
break;
case 28:
stack.push(((code[i] << 24) | (code[i + 1] << 16)) >> 16);
i += 2;
break;
case 29: // callgsubr
n = stack.pop() + font.gsubrsBias;
subrCode = font.gsubrs[n];
if (subrCode) {
parse(subrCode);
}
break;
case 30: // vhcurveto
while (stack.length > 0) {
xa = x; ya = y + stack.shift();
xb = xa + stack.shift(); yb = ya + stack.shift();
x = xb + stack.shift();
y = yb + (stack.length === 1 ? stack.shift() : 0);
bezierCurveTo(xa, ya, xb, yb, x, y);
if (stack.length === 0) {
break;
}
xa = x + stack.shift(); ya = y;
xb = xa + stack.shift(); yb = ya + stack.shift();
y = yb + stack.shift();
x = xb + (stack.length === 1 ? stack.shift() : 0);
bezierCurveTo(xa, ya, xb, yb, x, y);
}
break;
case 31: // hvcurveto
while (stack.length > 0) {
xa = x + stack.shift(); ya = y;
xb = xa + stack.shift(); yb = ya + stack.shift();
y = yb + stack.shift();
x = xb + (stack.length === 1 ? stack.shift() : 0);
bezierCurveTo(xa, ya, xb, yb, x, y);
if (stack.length === 0) {
break;
}
xa = x; ya = y + stack.shift();
xb = xa + stack.shift(); yb = ya + stack.shift();
x = xb + stack.shift();
y = yb + (stack.length === 1 ? stack.shift() : 0);
bezierCurveTo(xa, ya, xb, yb, x, y);
}
break;
default:
if (v < 32) {
throw new FormatError(`unknown operator: ${v}`);
}
if (v < 247) {
stack.push(v - 139);
} else if (v < 251) {
stack.push((v - 247) * 256 + code[i++] + 108);
} else if (v < 255) {
stack.push(-(v - 251) * 256 - code[i++] - 108);
} else {
stack.push(((code[i] << 24) | (code[i + 1] << 16) |
(code[i + 2] << 8) | code[i + 3]) / 65536);
i += 4;
}
break;
}
if (stackClean) {
stack.length = 0;
}
}
}
parse(code);
}
const NOOP = [];
class CompiledFont {
constructor(fontMatrix) {
if (this.constructor === CompiledFont) {
unreachable('Cannot initialize CompiledFont.');
}
this.fontMatrix = fontMatrix;
this.compiledGlyphs = Object.create(null);
this.compiledCharCodeToGlyphId = Object.create(null);
}
getPathJs(unicode) {
const cmap = lookupCmap(this.cmap, unicode);
let fn = this.compiledGlyphs[cmap.glyphId];
if (!fn) {
fn = this.compileGlyph(this.glyphs[cmap.glyphId], cmap.glyphId);
this.compiledGlyphs[cmap.glyphId] = fn;
}
if (this.compiledCharCodeToGlyphId[cmap.charCode] === undefined) {
this.compiledCharCodeToGlyphId[cmap.charCode] = cmap.glyphId;
}
return fn;
}
compileGlyph(code, glyphId) {
if (!code || code.length === 0 || code[0] === 14) {
return NOOP;
}
let fontMatrix = this.fontMatrix;
if (this.isCFFCIDFont) {
// Top DICT's FontMatrix can be ignored because CFFCompiler always
// removes it and copies to FDArray DICTs.
let fdIndex = this.fdSelect.getFDIndex(glyphId);
if (fdIndex >= 0 && fdIndex < this.fdArray.length) {
let fontDict = this.fdArray[fdIndex];
fontMatrix = fontDict.getByName('FontMatrix') || FONT_IDENTITY_MATRIX;
} else {
warn('Invalid fd index for glyph index.');
}
}
const cmds = [];
cmds.push({ cmd: 'save', });
cmds.push({ cmd: 'transform', args: fontMatrix.slice(), });
cmds.push({ cmd: 'scale', args: ['size', '-size'], });
this.compileGlyphImpl(code, cmds, glyphId);
cmds.push({ cmd: 'restore', });
return cmds;
}
compileGlyphImpl() {
unreachable('Children classes should implement this.');
}
hasBuiltPath(unicode) {
const cmap = lookupCmap(this.cmap, unicode);
return (this.compiledGlyphs[cmap.glyphId] !== undefined &&
this.compiledCharCodeToGlyphId[cmap.charCode] !== undefined);
}
}
class TrueTypeCompiled extends CompiledFont {
constructor(glyphs, cmap, fontMatrix) {
super(fontMatrix || [0.000488, 0, 0, 0.000488, 0, 0]);
this.glyphs = glyphs;
this.cmap = cmap;
}
compileGlyphImpl(code, cmds) {
compileGlyf(code, cmds, this);
}
}
class Type2Compiled extends CompiledFont {
constructor(cffInfo, cmap, fontMatrix, glyphNameMap) {
super(fontMatrix || [0.001, 0, 0, 0.001, 0, 0]);
this.glyphs = cffInfo.glyphs;
this.gsubrs = cffInfo.gsubrs || [];
this.subrs = cffInfo.subrs || [];
this.cmap = cmap;
this.glyphNameMap = glyphNameMap || getGlyphsUnicode();
this.gsubrsBias = (this.gsubrs.length < 1240 ?
107 : (this.gsubrs.length < 33900 ? 1131 : 32768));
this.subrsBias = (this.subrs.length < 1240 ?
107 : (this.subrs.length < 33900 ? 1131 : 32768));
this.isCFFCIDFont = cffInfo.isCFFCIDFont;
this.fdSelect = cffInfo.fdSelect;
this.fdArray = cffInfo.fdArray;
}
compileGlyphImpl(code, cmds, glyphId) {
compileCharString(code, cmds, this, glyphId);
}
}
return {
create: function FontRendererFactory_create(font, seacAnalysisEnabled) {
var data = new Uint8Array(font.data);
var cmap, glyf, loca, cff, indexToLocFormat, unitsPerEm;
var numTables = getUshort(data, 4);
for (var i = 0, p = 12; i < numTables; i++, p += 16) {
var tag = bytesToString(data.subarray(p, p + 4));
var offset = getLong(data, p + 8);
var length = getLong(data, p + 12);
switch (tag) {
case 'cmap':
cmap = parseCmap(data, offset, offset + length);
break;
case 'glyf':
glyf = data.subarray(offset, offset + length);
break;
case 'loca':
loca = data.subarray(offset, offset + length);
break;
case 'head':
unitsPerEm = getUshort(data, offset + 18);
indexToLocFormat = getUshort(data, offset + 50);
break;
case 'CFF ':
cff = parseCff(data, offset, offset + length, seacAnalysisEnabled);
break;
}
}
if (glyf) {
var fontMatrix = (!unitsPerEm ? font.fontMatrix :
[1 / unitsPerEm, 0, 0, 1 / unitsPerEm, 0, 0]);
return new TrueTypeCompiled(
parseGlyfTable(glyf, loca, indexToLocFormat), cmap, fontMatrix);
}
return new Type2Compiled(cff, cmap, font.fontMatrix, font.glyphNameMap);
},
};
})();
export {
FontRendererFactory,
};
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