82 lines
2.7 KiB
TypeScript
82 lines
2.7 KiB
TypeScript
/*
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* SPDX-FileCopyrightText: syuilo and misskey-project
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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import { promises as fsp } from 'fs';
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import { compress } from 'wawoff2';
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export async function generateSubsettedFont(ttfPath: string, unicodeRangeValues: Map<string, number[]>) {
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const ttf = await fsp.readFile(ttfPath);
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const {
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instance: { exports: harfbuzzWasm },
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}: any = await WebAssembly.instantiate(await fsp.readFile('./node_modules/harfbuzzjs/hb-subset.wasm'));
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const heapu8 = new Uint8Array(harfbuzzWasm.memory.buffer);
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const subsetFonts = new Map<string, Buffer>();
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let i = 0;
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for (const [key, unicodeValues] of unicodeRangeValues) {
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i++;
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console.log(`Generating subset ${i} of ${unicodeRangeValues.size}...`);
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// サブセット入力を作成
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const input = harfbuzzWasm.hb_subset_input_create_or_fail();
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if (input === 0) {
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throw new Error('hb_subset_input_create_or_fail (harfbuzz) returned zero');
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}
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// フォントバッファにフォントデータをセット
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const fontBuffer = harfbuzzWasm.malloc(ttf.byteLength);
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heapu8.set(new Uint8Array(ttf), fontBuffer);
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// フォントフェイスを作成
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const blob = harfbuzzWasm.hb_blob_create(fontBuffer, ttf.byteLength, 2, 0, 0);
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const face = harfbuzzWasm.hb_face_create(blob, 0);
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harfbuzzWasm.hb_blob_destroy(blob);
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// Unicodeセットに指定されたUnicodeポイントを追加
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const inputUnicodes = harfbuzzWasm.hb_subset_input_unicode_set(input);
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for (const unicode of unicodeValues) {
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harfbuzzWasm.hb_set_add(inputUnicodes, unicode);
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}
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// サブセットを作成
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let subset;
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try {
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subset = harfbuzzWasm.hb_subset_or_fail(face, input);
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if (subset === 0) {
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harfbuzzWasm.hb_face_destroy(face);
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harfbuzzWasm.free(fontBuffer);
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throw new Error('hb_subset_or_fail (harfbuzz) returned zero');
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}
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} finally {
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harfbuzzWasm.hb_subset_input_destroy(input);
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}
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// サブセットフォントデータを取得
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const result = harfbuzzWasm.hb_face_reference_blob(subset);
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const offset = harfbuzzWasm.hb_blob_get_data(result, 0);
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const subsetByteLength = harfbuzzWasm.hb_blob_get_length(result);
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if (subsetByteLength === 0) {
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harfbuzzWasm.hb_face_destroy(face);
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harfbuzzWasm.hb_blob_destroy(result);
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harfbuzzWasm.free(fontBuffer);
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throw new Error('hb_blob_get_length (harfbuzz) returned zero');
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}
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// サブセットフォントをバッファに格納
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subsetFonts.set(key, Buffer.from(await compress(heapu8.slice(offset, offset + subsetByteLength))));
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// メモリを解放
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harfbuzzWasm.hb_blob_destroy(result);
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harfbuzzWasm.hb_face_destroy(subset);
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harfbuzzWasm.hb_face_destroy(face);
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harfbuzzWasm.free(fontBuffer);
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}
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return subsetFonts;
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}
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