render/

Package canvas paints a layout.Document onto a monochrome bitmap (Canvas) and encodes it as PNG for preview.

Package escpos encodes a canvas.Canvas into ESC/POS bytes: raster print commands plus minimal real ESC/POS (init, feed, cut), tailored to a printer.Profile.

Package layout turns a receipt.Receipt plus a printer.Profile into a Document: a fully resolved, positioned set of draw instructions (pure data — no pixels yet).