Fill Routine

[boriel]

Boriel - I think this, with a bit of clean up, should possibly go into the compiler as available.

Thanks, Na_th_an for reminding me of SPLIB2, which made me see this again, and go "Right, I'm gonna do this this time..."

Thanks, for this!
I'm about to do so, however, notice there are ASM routines called inc and dec screen position. Very (almost identical) routines are already packeted with the optimized DRAW routine (It's really very optimized!). I think it would be a good idea to replace SPPixelUP: body with a simple call to INCY / DECY routines, or vice versa, replace DRAW INC/DEC y routines with these ones.

They are almost identical, except some flag check.
Since DRAW is alwaws packed with ZX BASIC I guess it would be rather easy to replace them so no duplicated code is included and so, some precious bytes saved!