flutter_svg/example/assets/simple/image.svg

<svg viewBox="0 0 50 50"
    xmlns="http://www.w3.org/2000/svg"
    xmlns:xlink="http://www.w3.org/1999/xlink">
    <image xlink:href="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA
UAAAAFCAYAAACNb yblA AAAHElEQVQI12P4//8/w3 8GIAXDIBKE0DHxgljN
BAAO9TXL0Y4OHwAAAABJRU5ErkJggg==" height="20" width="20" transform="translate(1 1)"/>
    <image xlink:href="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==" x="25" y="25" height="1" width="1"/>
</svg>