I have definitely needed this exact functionality in the recent past. We had an application where a canvas-based editor was used to create diagrams, and then t

I have definitely needed this exact functionality in the recent past. We had an application where a canvas-based editor was used to create diagrams, and then these diagrams were saved to a library. We wanted to have each saved diagram to have a preview image to better visually distinguish between them while scrolling. The ability to render a png on the server from the canvas would have saved us a lot of trouble.