Can't load svg with base64 image inside

Issue or Feature

When load svg ( with base64 image inside ) file using function loadImage I get exception: GdkPixbuf-CRITICAL **: 13:03:49.842: gdk_pixbuf_get_width: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

Steps to Reproduce

1. Run following code to load svg file:

const fs = require('fs');
const { createCanvas, loadImage } = require('canvas');

async function nodeCanvasTest() {
  console.log('starting...');
  const canvas = createCanvas(400, 200);
  const ctx = canvas.getContext('2d');

  image = await loadImage('./input.svg');

  ctx.drawImage(image, 0, 0);
  var stream = canvas.createPNGStream();
  stream.pipe(fs.createWriteStream('output.png'));
  console.log('completed');
}

nodeCanvasTest();

Here is svg file:

input.svg.zip

2. In the terminal run command: node server.js

3. Get Error: GdkPixbuf-CRITICAL **: 13:03:49.842: gdk_pixbuf_get_width: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

Your Environment

OS: MacOS Catalina 10.15.5 Node: v10.16.0 NPM: 6.9.2 Canvas: canvas@2.6.1

Expected:

SVG file is loaded & rendered normally.