Max Richter
c513605de6
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45 lines
1.1 KiB
TypeScript
45 lines
1.1 KiB
TypeScript
let loadingSharp = false;
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import { rgbaToThumbHash } from "thumbhash";
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let s: typeof import("sharp") | undefined;
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async function getSharp(): Promise<typeof import("sharp") | undefined> {
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if (s) return s;
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if (import.meta.env.MODE !== "development") {
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s = (await import("sharp")).default;
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return s;
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}
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if (!loadingSharp) {
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loadingSharp = true;
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setTimeout(async () => {
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s = (await import("sharp")).default;
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}, 1000);
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return;
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}
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}
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export async function generateThumbHash(image: { width: number, height: number }) {
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const sharp = await getSharp();
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if (!sharp) return;
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const scaleFactor = 100 / Math.max(image.width, image.height);
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const smallWidth = Math.floor(image.width * scaleFactor);
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const smallHeight = Math.floor(image.height * scaleFactor);
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//@ts-ignore
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const smallImg = await sharp(image.fsPath)
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.resize(smallWidth, smallHeight)
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.withMetadata()
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.raw()
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.ensureAlpha()
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.toBuffer();
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const buffer = rgbaToThumbHash(smallWidth, smallHeight, smallImg);
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return Buffer.from(buffer).toString("base64");
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}
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