⭐ Starforge is a pixel art editor that runs in your browser. Yesterday it could only draw in a single surface. Today the same old star is five stacked layers, carrying its own opacity, visibility and lock, plus a rule for how its colors blend with the layers below.

How it works

Compositing every layer on every frame can’t hold 60fps. At 256x256 with eight layers at 800% zoom that’s eight blits of 2048×2048 per frame, about 33 megapixels of work to show a picture that didn’t change. So the editor composites once per change into an offscreen canvas, and the screen just draws that one image. Rendering with no cost since that nothing changed.

All with 169 green tests.