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utf8mb4
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utf8mb4
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node_modules/fontkit/src/subset/TTFSubset.js
| 130 lines
| 3.3 KiB
| application/javascript
| JavascriptLexer
|
| r789 | 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 = new Buffer(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 | ||||
| } | ||||
| }); | ||||
| } | ||||
| } | ||||