canvas.toDataURL is missing SVG support

[dohard-ma]

1. os debian9
2. node v11.11.0
3. jsbarcode@3.11.0
4. canvas@2.6.1

code:

import { createCanvas } from 'canvas';
import jsbarcode from 'jsbarcode';

	const canvas = createCanvas(1000, 1000, 'svg');
	jsbarcode(canvas, 'Hello');
	const barcode_img = canvas.toBuffer() // successfully
	// const barcode_img = canvas.toDataURL(); // fails
	return {
		data: barcode_img,
		content_type: 'image/png'
	};

toBuffer() returns successfully, but toDataURL() fails. This may be a bug

[dohard-ma]

国内使用canvas，尽量使用cnpm安装依赖

[zbjornson]

toDataURL is missing SVG support. You can do it manually though with this:

const barcode_img = canvas.toBuffer().toString();
const end_decl = barcode_img.indexOf(">");
const content = barcode_img.slice(end_decl + 1).replace(/\n/g, "");
const data_url = `data:image/svg+xml;utf8,${content}`;
console.log(data_url);