Telegram Web K with changes to work inside I2P
https://web.telegram.i2p/
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99 lines
2.4 KiB
99 lines
2.4 KiB
class AppWebpManager { |
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private webpMachine: any = null; |
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private loaded: Promise<void>; |
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private busyPromise: Promise<Uint8Array | void>; |
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private queue: {bytes: Uint8Array, callback: (res: Uint8Array) => void}[] = []; |
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private testPromise: Promise<boolean> = null; |
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public webpSupport = false; |
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constructor() { |
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this.testWebpSupport(); |
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} |
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private loadWebpHero() { |
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if(this.loaded) return this.loaded; |
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this.loaded = new Promise(async(resolve, reject) => { |
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let res = await this.testWebpSupport(); |
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if(!res) { |
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(window as any).webpLoaded = () => { |
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//console.log('webpHero loaded'); |
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this.webpMachine = new (window as any).WebpMachine(); |
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resolve(); |
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}; |
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let sc = document.createElement('script'); |
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sc.src = 'npm.webp-hero.chunk.js'; |
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sc.async = true; |
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sc.onload = (window as any).webpLoaded; |
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document.body.appendChild(sc); |
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} else { |
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resolve(); |
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} |
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}); |
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} |
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private convert(bytes: Uint8Array): AppWebpManager['busyPromise'] { |
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return this.webpMachine.decode(bytes); |
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} |
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private async processQueue() { |
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if(this.busyPromise) return; |
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this.busyPromise = Promise.resolve(); |
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let {bytes, callback} = this.queue.pop(); |
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if(!this.loaded) { |
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this.loadWebpHero(); |
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} |
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await this.loaded; |
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this.busyPromise = this.convert(bytes); |
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let res = await this.busyPromise; |
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//console.log('converted webp', res); |
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callback(res as Uint8Array); |
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this.busyPromise = null; |
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if(this.queue.length) { |
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this.processQueue(); |
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} |
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} |
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public testWebpSupport() { |
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if(this.testPromise) return this.testPromise; |
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return this.testPromise = new Promise((resolve, reject) => { |
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let webP = new Image(); |
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webP.src = 'data:image/webp;base64,UklGRi4AAABXRUJQVlA4TCEAAAAvAUAAEB8wAiMw' + |
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'AgSSNtse/cXjxyCCmrYNWPwmHRH9jwMA'; |
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webP.onload = webP.onerror = () => { |
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resolve(this.webpSupport = webP.height === 2/* && false */); |
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}; |
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}); |
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} |
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public isSupported() { |
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return this.webpSupport; |
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} |
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public convertToPng(bytes: Uint8Array) { |
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//console.warn('convertToPng!'); |
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return new Promise<Uint8Array>((resolve, reject) => { |
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// @ts-ignore |
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this.queue.push({bytes, callback: resolve}); |
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this.processQueue(); |
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}); |
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} |
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} |
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const appWebpManager = new AppWebpManager(); |
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(window as any).appWebpManager = appWebpManager; |
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export default appWebpManager;
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