misskey/packages/frontend/src/utility/isWebpSupported.ts

/*
 * SPDX-FileCopyrightText: syuilo and misskey-project
 * SPDX-License-Identifier: AGPL-3.0-only
 */

let isWebpSupportedCache: boolean | undefined;
export function isWebpSupported() {
	if (isWebpSupportedCache === undefined) {
		const canvas = window.document.createElement('canvas');
		canvas.width = 1;
		canvas.height = 1;
		isWebpSupportedCache = canvas.toDataURL('image/webp').startsWith('data:image/webp');
	}
	return isWebpSupportedCache;
}