| From: | Curt Esser |
| Date: | 2 Sep 99 at 00:10:56 |
| Subject: | Re: Blitting |
Hi Vic
On 01-Sep-99, Vic E Babes wrote:
> Hello, ppl
>
> Can anyone explain to me how to use the extended BBlit command that
> instructs the blitter which bitplanes to `miss out` for shapes that don`t
> use the full palette - I can`t tell if I`m getting them the right way
> around - the manual is less than useful.
>
> If, for example, I have a 32 colour palette, but have some shapes that
> only use the first 16 colours, what format would the BBlit command take to
> ensure that the processor doesn`t bother with the second 16 colours.
The "Excess ON/OFF" parameter for blitting goes like this:
Bit one is the first EXCESS bitplane - (in your example it would actually be
the Third actual bitplane), the next bit - the next bitplane, etc.
So, "Blit Shape#, X, Y, %11" should do the job - or maybe %00 - I don't
remember exactly which way is correct - try 'em both and see.
Or just use %11111111 (or %00000000) to turn on/off any possible number of
excess bitplanes...
Later...
Yours electronically,
Curt Esser
camge@ix.netcom.com
http://members.xoom.com/Curt_Esser/
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