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Fallback to fastBlur for Safari

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This commit is contained in:
Alexander Zinchuk 2024-09-06 15:42:59 +02:00
parent f2e8768123
commit 3c1248b471
1 changed files with 13 additions and 4 deletions
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17
src/lib/offscreen-canvas/offscreen-canvas.worker.ts
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@ -1,14 +1,23 @@
import { createWorkerInterface } from '../../util/createPostMessageInterface';
import fastBlur from '../fastBlur';
const FAST_BLUR_ITERATIONS = 2;
export async function blurThumb(canvas: OffscreenCanvas, dataUri: string, radius: number) {
const imageBitmap = await dataUriToImageBitmap(dataUri);
const { width, height } = canvas;
const ctx = canvas.getContext('2d')!;
const isFilterSupported = 'filter' in ctx;
// Draw image twice to battle white-ish edges
ctx.drawImage(imageBitmap, 0, 0, width, height);
ctx.filter = `blur(${radius}px)`;
ctx.drawImage(imageBitmap, 0, 0, width, height);
if (isFilterSupported) {
ctx.filter = `blur(${radius}px)`;
}
ctx.drawImage(imageBitmap, -radius * 2, -radius * 2, width + radius * 4, height + radius * 4);
if (!isFilterSupported) {
fastBlur(ctx, 0, 0, width, height, radius, FAST_BLUR_ITERATIONS);
}
}
function dataUriToImageBitmap(dataUri: string) {