63 lines
1.9 KiB
TypeScript
63 lines
1.9 KiB
TypeScript
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import { fetchMscz } from './mscz'
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import { fetchData } from './utils'
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const WEBMSCORE_URL = 'https://cdn.jsdelivr.net/npm/webmscore@0.10/webmscore.js'
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// fonts for Chinese characters (CN) and Korean hangul (KR)
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// JP characters are included in the CN font
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const FONT_URLS = ['CN', 'KR'].map(l => `https://cdn.jsdelivr.net/npm/@librescore/fonts/SourceHanSans${l}-Regular.woff2`)
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const SF3_URL = 'https://cdn.jsdelivr.net/npm/@librescore/sf3/FluidR3Mono_GM.sf3'
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const SOUND_FONT_LOADED = Symbol('SoundFont loaded')
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export type WebMscore = import('webmscore').default
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const initMscore = async (w: Window) => {
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if (!w['WebMscore']) {
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// init webmscore (https://github.com/LibreScore/webmscore)
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const script = w.document.createElement('script')
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script.src = WEBMSCORE_URL
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w.document.body.append(script)
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await new Promise(resolve => { script.onload = resolve })
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}
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}
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let fonts: Promise<Uint8Array[]> | undefined
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const initFonts = () => {
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// load CJK fonts
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// CJK (East Asian) characters will be rendered as "tofu" if there is no font
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if (!fonts) {
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fonts = Promise.all(
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FONT_URLS.map(url => fetchData(url)),
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)
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}
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}
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export const loadSoundFont = (score: WebMscore): Promise<void> => {
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if (!score[SOUND_FONT_LOADED]) {
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const loadPromise = (async () => {
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await score.setSoundFont(
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await fetchData(SF3_URL),
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)
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})()
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score[SOUND_FONT_LOADED] = loadPromise
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}
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return score[SOUND_FONT_LOADED] as Promise<void>
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}
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export const loadMscore = async (w: Window): Promise<WebMscore> => {
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initFonts()
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await initMscore(w)
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const WebMscore: typeof import('webmscore').default = w['WebMscore']
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// parse mscz data
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const data = new Uint8Array(
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new Uint8Array(await fetchMscz()), // copy its ArrayBuffer
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)
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const score = await WebMscore.load('mscz', data, await fonts)
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await score.generateExcerpts()
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return score
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}
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