[londons_explore]

I've only briefly looked at skia internals.... And it's awfully complex!

But the external API is fairly simple. Basically you queue up various drawing commands and at the last minute tell it to execute the queued commands somewhere.

The queue is 'optimized' - for example if you tell it to draw some text and later crop the text out of the image, then no CPU/GPU time will be spent drawing text that won't be visible in the output. You can also draw text small and scale it up later without getting jagged edges as you would if you'd scaled up a raster image.

That ability lets you make tile based renderers, where you queue up all the commands for say a whole webpage, but then draw only a small square of the page like a map tile, and as the user scrolls/pans, you can draw more tiles as needed.