Signal-Desktop/ts/util/createIdenticon.tsx

55 lines
1.5 KiB
TypeScript

// Copyright 2021 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import React from 'react';
import loadImage from 'blueimp-load-image';
import { renderToString } from 'react-dom/server';
import type { AvatarColorType } from '../types/Colors';
import { AvatarColorMap } from '../types/Colors';
import { IdenticonSVG } from '../components/IdenticonSVG';
export function createIdenticon(
color: AvatarColorType,
content: string
): Promise<string> {
const [defaultColorValue] = Array.from(AvatarColorMap.values());
const avatarColor = AvatarColorMap.get(color);
const html = renderToString(
<IdenticonSVG
backgroundColor={avatarColor?.bg || defaultColorValue.bg}
content={content}
foregroundColor={avatarColor?.fg || defaultColorValue.fg}
/>
);
const svg = new Blob([html], { type: 'image/svg+xml;charset=utf-8' });
const svgUrl = URL.createObjectURL(svg);
return new Promise(resolve => {
const img = document.createElement('img');
img.onload = () => {
const canvas = loadImage.scale(img, {
canvas: true,
maxWidth: 100,
maxHeight: 100,
});
if (!(canvas instanceof HTMLCanvasElement)) {
resolve('');
return;
}
const ctx = canvas.getContext('2d');
if (ctx) {
ctx.drawImage(img, 0, 0);
}
URL.revokeObjectURL(svgUrl);
resolve(canvas.toDataURL('image/png'));
};
img.onerror = () => {
URL.revokeObjectURL(svgUrl);
resolve('');
};
img.src = svgUrl;
});
}