Now I'm thinking how to reconcile the typical layered pixmap editor that Deluxe Draw aims to implement with the ZX Spectrum colour model.
That would require the editor to support layers of different resolutions:
- background plane with attributes (32 x 24)
- bitmap plane on top acquiring colours from the attribute layer underneath.
It could conceivably be construed as a blend mode of sorts. That might possibly work.
The blend mode seems doable, the different resolutions per layer is more tricky or possibly hacky.