We now have 1-bit horizontal maps. One use for these is for rendering bitmaps such as font glyphs by blitting from a framebuf containing the glyph to the destination framebuf. This works - in a geometry agnostic manner - on monochrome displays where the destination uses 1-bit colour mapping.

Where the destination uses n-bit colour maps the resultant colour is unexpected. The general solution is to introduce the concept of palettes defining a mapping between differing colour spaces. This is not 'micro'.

A 'micro' solution might be to add an optional colour arg to the blit method which, when the source framebuf has a 1-bit mapping, causes the blit to be rendered in the supplied colour. This would enable fast font rendering in arbitrary colours and would be easily implemented.

Or is there a better approach?