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import cloneDeep from 'clone';
import Subset from './Subset';
import Directory from '../tables/directory';
import Tables from '../tables';
import TTFGlyphEncoder from '../glyph/TTFGlyphEncoder';
export default class TTFSubset extends Subset {
constructor(font) {
super(font);
this.glyphEncoder = new TTFGlyphEncoder;
}
_addGlyph(gid) {
let glyph = this.font.getGlyph(gid);
let glyf = glyph._decode();
// get the offset to the glyph from the loca table
let curOffset = this.font.loca.offsets[gid];
let nextOffset = this.font.loca.offsets[gid + 1];
let stream = this.font._getTableStream('glyf');
stream.pos += curOffset;
let buffer = stream.readBuffer(nextOffset - curOffset);
// if it is a compound glyph, include its components
if (glyf && glyf.numberOfContours < 0) {
buffer = Buffer.from(buffer);
for (let component of glyf.components) {
gid = this.includeGlyph(component.glyphID);
buffer.writeUInt16BE(gid, component.pos);
}
} else if (glyf && this.font._variationProcessor) {
// If this is a TrueType variation glyph, re-encode the path
buffer = this.glyphEncoder.encodeSimple(glyph.path, glyf.instructions);
}
this.glyf.push(buffer);
this.loca.offsets.push(this.offset);
this.hmtx.metrics.push({
advance: glyph.advanceWidth,
bearing: glyph._getMetrics().leftBearing
});
this.offset += buffer.length;
return this.glyf.length - 1;
}
encode(stream) {
// tables required by PDF spec:
// head, hhea, loca, maxp, cvt , prep, glyf, hmtx, fpgm
//
// additional tables required for standalone fonts:
// name, cmap, OS/2, post
this.glyf = [];
this.offset = 0;
this.loca = {
offsets: [],
version: this.font.loca.version
};
this.hmtx = {
metrics: [],
bearings: []
};
// include all the glyphs
// not using a for loop because we need to support adding more
// glyphs to the array as we go, and CoffeeScript caches the length.
let i = 0;
while (i < this.glyphs.length) {
this._addGlyph(this.glyphs[i++]);
}
let maxp = cloneDeep(this.font.maxp);
maxp.numGlyphs = this.glyf.length;
this.loca.offsets.push(this.offset);
let head = cloneDeep(this.font.head);
head.indexToLocFormat = this.loca.version;
let hhea = cloneDeep(this.font.hhea);
hhea.numberOfMetrics = this.hmtx.metrics.length;
// map = []
// for index in [0...256]
// if index < @numGlyphs
// map[index] = index
// else
// map[index] = 0
//
// cmapTable =
// version: 0
// length: 262
// language: 0
// codeMap: map
//
// cmap =
// version: 0
// numSubtables: 1
// tables: [
// platformID: 1
// encodingID: 0
// table: cmapTable
// ]
// TODO: subset prep, cvt, fpgm?
Directory.encode(stream, {
tables: {
head,
hhea,
loca: this.loca,
maxp,
'cvt ': this.font['cvt '],
prep: this.font.prep,
glyf: this.glyf,
hmtx: this.hmtx,
fpgm: this.font.fpgm
// name: clone @font.name
// 'OS/2': clone @font['OS/2']
// post: clone @font.post
// cmap: cmap
}
});
}
}