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feat: thumbhash improvments for reactive prop updates

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midzelis
2026-01-15 20:34:21 +00:00
parent 79b6c4ac70
commit d50c83c424
1 changed files with 22 additions and 12 deletions
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34
web/src/lib/actions/thumbhash.ts
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@@ -3,17 +3,27 @@ import { thumbHashToRGBA } from 'thumbhash';
/**
* Renders a thumbnail onto a canvas from a base64 encoded hash.
* @param canvas
* @param param1 object containing the base64 encoded hash (base64Thumbhash: yourString)
*/
export function thumbhash(canvas: HTMLCanvasElement, { base64ThumbHash }: { base64ThumbHash: string }) {
const ctx = canvas.getContext('2d');
if (ctx) {
const { w, h, rgba } = thumbHashToRGBA(decodeBase64(base64ThumbHash));
const pixels = ctx.createImageData(w, h);
canvas.width = w;
canvas.height = h;
pixels.data.set(rgba);
ctx.putImageData(pixels, 0, 0);
}
export function thumbhash(canvas: HTMLCanvasElement, options: { base64ThumbHash: string }) {
render(canvas, options);
return {
update(newOptions: { base64ThumbHash: string }) {
render(canvas, newOptions);
},
};
}
const render = (canvas: HTMLCanvasElement, options: { base64ThumbHash: string }) => {
const ctx = canvas.getContext('2d');
if (!ctx) {
return;
}
const { w, h, rgba } = thumbHashToRGBA(decodeBase64(options.base64ThumbHash));
const pixels = ctx.createImageData(w, h);
canvas.width = w;
canvas.height = h;
pixels.data.set(rgba);
ctx.putImageData(pixels, 0, 0);
};