Posted By
Rachy
on 2006-02-02
04:44:52
|  Re: Xeo3 - Background tiles..... Blog 29/01/2006. (impasse!)
What are the advantages of bitmap scrolling against the character scrolling:
1. you are not limited to one (or few) charset(s)
2. the scrolling itself can be solved via the hardware addressing, thus all you need to refresh is the new part of the screen, which is: 25*8=200 bytes, while scrolling the whole screen (w/o color data) is: 25*40=1000 bytes.
What are the drawbacks:
1. loss of memory (lotsa, I must admit)
2. the new parts of the screen must be redrawn right at once, cannot be built in the background
3. sprite parts need clearing
4. animation needs refreshing (I guess it needs to be done in the charsets too anyway)
I think it worth considering.
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