| Current File : /home/tradevaly/www/node_modules/fontkit/src/cff/CFFTop.js |
import r from 'restructure';
import { resolveLength } from 'restructure/src/utils';
import CFFDict from './CFFDict';
import CFFIndex from './CFFIndex';
import CFFPointer from './CFFPointer';
import CFFPrivateDict from './CFFPrivateDict';
import StandardStrings from './CFFStandardStrings';
import { StandardEncoding, ExpertEncoding } from './CFFEncodings';
import { ISOAdobeCharset, ExpertCharset, ExpertSubsetCharset } from './CFFCharsets';
import { ItemVariationStore } from '../tables/variations';
// Checks if an operand is an index of a predefined value,
// otherwise delegates to the provided type.
class PredefinedOp {
constructor(predefinedOps, type) {
this.predefinedOps = predefinedOps;
this.type = type;
}
decode(stream, parent, operands) {
if (this.predefinedOps[operands[0]]) {
return this.predefinedOps[operands[0]];
}
return this.type.decode(stream, parent, operands);
}
size(value, ctx) {
return this.type.size(value, ctx);
}
encode(stream, value, ctx) {
let index = this.predefinedOps.indexOf(value);
if (index !== -1) {
return index;
}
return this.type.encode(stream, value, ctx);
}
}
class CFFEncodingVersion extends r.Number {
constructor() {
super('UInt8');
}
decode(stream) {
return r.uint8.decode(stream) & 0x7f;
}
}
let Range1 = new r.Struct({
first: r.uint16,
nLeft: r.uint8
});
let Range2 = new r.Struct({
first: r.uint16,
nLeft: r.uint16
});
let CFFCustomEncoding = new r.VersionedStruct(new CFFEncodingVersion(), {
0: {
nCodes: r.uint8,
codes: new r.Array(r.uint8, 'nCodes')
},
1: {
nRanges: r.uint8,
ranges: new r.Array(Range1, 'nRanges')
}
// TODO: supplement?
});
let CFFEncoding = new PredefinedOp([ StandardEncoding, ExpertEncoding ], new CFFPointer(CFFCustomEncoding, { lazy: true }));
// Decodes an array of ranges until the total
// length is equal to the provided length.
class RangeArray extends r.Array {
decode(stream, parent) {
let length = resolveLength(this.length, stream, parent);
let count = 0;
let res = [];
while (count < length) {
let range = this.type.decode(stream, parent);
range.offset = count;
count += range.nLeft + 1;
res.push(range);
}
return res;
}
}
let CFFCustomCharset = new r.VersionedStruct(r.uint8, {
0: {
glyphs: new r.Array(r.uint16, t => t.parent.CharStrings.length - 1)
},
1: {
ranges: new RangeArray(Range1, t => t.parent.CharStrings.length - 1)
},
2: {
ranges: new RangeArray(Range2, t => t.parent.CharStrings.length - 1)
}
});
let CFFCharset = new PredefinedOp([ ISOAdobeCharset, ExpertCharset, ExpertSubsetCharset ], new CFFPointer(CFFCustomCharset, {lazy: true}));
let FDRange3 = new r.Struct({
first: r.uint16,
fd: r.uint8
});
let FDRange4 = new r.Struct({
first: r.uint32,
fd: r.uint16
});
let FDSelect = new r.VersionedStruct(r.uint8, {
0: {
fds: new r.Array(r.uint8, t => t.parent.CharStrings.length)
},
3: {
nRanges: r.uint16,
ranges: new r.Array(FDRange3, 'nRanges'),
sentinel: r.uint16
},
4: {
nRanges: r.uint32,
ranges: new r.Array(FDRange4, 'nRanges'),
sentinel: r.uint32
}
});
let ptr = new CFFPointer(CFFPrivateDict);
class CFFPrivateOp {
decode(stream, parent, operands) {
parent.length = operands[0];
return ptr.decode(stream, parent, [operands[1]]);
}
size(dict, ctx) {
return [CFFPrivateDict.size(dict, ctx, false), ptr.size(dict, ctx)[0]];
}
encode(stream, dict, ctx) {
return [CFFPrivateDict.size(dict, ctx, false), ptr.encode(stream, dict, ctx)[0]];
}
}
let FontDict = new CFFDict([
// key name type(s) default
[18, 'Private', new CFFPrivateOp, null],
[[12, 38], 'FontName', 'sid', null],
[[12, 7], 'FontMatrix', 'array', [0.001, 0, 0, 0.001, 0, 0]],
[[12, 5], 'PaintType', 'number', 0],
]);
let CFFTopDict = new CFFDict([
// key name type(s) default
[[12, 30], 'ROS', ['sid', 'sid', 'number'], null],
[0, 'version', 'sid', null],
[1, 'Notice', 'sid', null],
[[12, 0], 'Copyright', 'sid', null],
[2, 'FullName', 'sid', null],
[3, 'FamilyName', 'sid', null],
[4, 'Weight', 'sid', null],
[[12, 1], 'isFixedPitch', 'boolean', false],
[[12, 2], 'ItalicAngle', 'number', 0],
[[12, 3], 'UnderlinePosition', 'number', -100],
[[12, 4], 'UnderlineThickness', 'number', 50],
[[12, 5], 'PaintType', 'number', 0],
[[12, 6], 'CharstringType', 'number', 2],
[[12, 7], 'FontMatrix', 'array', [0.001, 0, 0, 0.001, 0, 0]],
[13, 'UniqueID', 'number', null],
[5, 'FontBBox', 'array', [0, 0, 0, 0]],
[[12, 8], 'StrokeWidth', 'number', 0],
[14, 'XUID', 'array', null],
[15, 'charset', CFFCharset, ISOAdobeCharset],
[16, 'Encoding', CFFEncoding, StandardEncoding],
[17, 'CharStrings', new CFFPointer(new CFFIndex), null],
[18, 'Private', new CFFPrivateOp, null],
[[12, 20], 'SyntheticBase', 'number', null],
[[12, 21], 'PostScript', 'sid', null],
[[12, 22], 'BaseFontName', 'sid', null],
[[12, 23], 'BaseFontBlend', 'delta', null],
// CID font specific
[[12, 31], 'CIDFontVersion', 'number', 0],
[[12, 32], 'CIDFontRevision', 'number', 0],
[[12, 33], 'CIDFontType', 'number', 0],
[[12, 34], 'CIDCount', 'number', 8720],
[[12, 35], 'UIDBase', 'number', null],
[[12, 37], 'FDSelect', new CFFPointer(FDSelect), null],
[[12, 36], 'FDArray', new CFFPointer(new CFFIndex(FontDict)), null],
[[12, 38], 'FontName', 'sid', null]
]);
let VariationStore = new r.Struct({
length: r.uint16,
itemVariationStore: ItemVariationStore
})
let CFF2TopDict = new CFFDict([
[[12, 7], 'FontMatrix', 'array', [0.001, 0, 0, 0.001, 0, 0]],
[17, 'CharStrings', new CFFPointer(new CFFIndex), null],
[[12, 37], 'FDSelect', new CFFPointer(FDSelect), null],
[[12, 36], 'FDArray', new CFFPointer(new CFFIndex(FontDict)), null],
[24, 'vstore', new CFFPointer(VariationStore), null],
[25, 'maxstack', 'number', 193]
]);
let CFFTop = new r.VersionedStruct(r.fixed16, {
1: {
hdrSize: r.uint8,
offSize: r.uint8,
nameIndex: new CFFIndex(new r.String('length')),
topDictIndex: new CFFIndex(CFFTopDict),
stringIndex: new CFFIndex(new r.String('length')),
globalSubrIndex: new CFFIndex
},
2: {
hdrSize: r.uint8,
length: r.uint16,
topDict: CFF2TopDict,
globalSubrIndex: new CFFIndex
}
});
export default CFFTop;