mirror of https://github.com/mastodon/mastodon
48 lines
1.2 KiB
TypeScript
48 lines
1.2 KiB
TypeScript
import { decode } from 'blurhash';
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import React, { useRef, useEffect } from 'react';
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type Props = {
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hash: string;
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width?: number;
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height?: number;
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dummy?: boolean; // Whether dummy mode is enabled. If enabled, nothing is rendered and canvas left untouched
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children?: never;
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[key: string]: any;
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};
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const Blurhash: React.FC<Props> = ({
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hash,
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width = 32,
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height = width,
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dummy = false,
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...canvasProps
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}) => {
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const canvasRef = useRef<HTMLCanvasElement>(null);
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useEffect(() => {
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// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
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const canvas = canvasRef.current!;
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// eslint-disable-next-line no-self-assign
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canvas.width = canvas.width; // resets canvas
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if (dummy || !hash) return;
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try {
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const pixels = decode(hash, width, height);
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const ctx = canvas.getContext('2d');
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const imageData = new ImageData(pixels, width, height);
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ctx?.putImageData(imageData, 0, 0);
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} catch (err) {
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console.error('Blurhash decoding failure', { err, hash });
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}
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}, [dummy, hash, width, height]);
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return (
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<canvas {...canvasProps} ref={canvasRef} width={width} height={height} />
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);
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};
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const MemoizedBlurhash = React.memo(Blurhash);
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export { MemoizedBlurhash as Blurhash };
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