| From: | Vic E Babes |
| Date: | 2 Sep 99 at 19:03:49 |
| Subject: | Re: Blitting |
Hello, Curt,
> 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.
>
Yeah, that`s pretty much what the manual says, and I tried both, but could
see no difference, just wondered if anyone knew for definite.
> Or just use %11111111 (or %00000000) to turn on/off any possible number
of
> excess bitplanes...
>
Thanks Curt
VIC
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