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69
backend/frontend/node_modules/@restart/hooks/esm/useImage.js
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69
backend/frontend/node_modules/@restart/hooks/esm/useImage.js
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import { useState, useEffect } from 'react';
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/**
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* Fetch and load an image for programatic use such as in a `<canvas>` element.
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*
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* @param imageOrUrl The `HtmlImageElement` or image url to load
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* @param crossOrigin The `crossorigin` attribute to set
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*
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* ```ts
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* const { image, error } = useImage('/static/kittens.png')
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* const ref = useRef<HTMLCanvasElement>()
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*
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* useEffect(() => {
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* const ctx = ref.current.getContext('2d')
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*
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* if (image) {
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* ctx.drawImage(image, 0, 0)
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* }
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* }, [ref, image])
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*
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* return (
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* <>
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* {error && "there was a problem loading the image"}
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* <canvas ref={ref} />
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* </>
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* ```
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*/
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export default function useImage(imageOrUrl, crossOrigin) {
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const [state, setState] = useState({
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image: null,
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error: null
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});
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useEffect(() => {
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if (!imageOrUrl) return undefined;
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let image;
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if (typeof imageOrUrl === 'string') {
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image = new Image();
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if (crossOrigin) image.crossOrigin = crossOrigin;
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image.src = imageOrUrl;
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} else {
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image = imageOrUrl;
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if (image.complete && image.naturalHeight > 0) {
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setState({
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image,
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error: null
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});
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return;
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}
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}
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function onLoad() {
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setState({
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image,
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error: null
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});
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}
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function onError(error) {
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setState({
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image,
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error
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});
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}
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image.addEventListener('load', onLoad);
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image.addEventListener('error', onError);
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return () => {
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image.removeEventListener('load', onLoad);
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image.removeEventListener('error', onError);
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};
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}, [imageOrUrl, crossOrigin]);
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return state;
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}
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