| From: | Allan Odgaard |
| Date: | 24 Apr 00 at 02:30:03 |
| Subject: | Friend bitmap (was: Re: Minterms) |
On 24-Apr-00, andrewmarkwell@ukonline.co.uk wrote:
>> call, and make sure that you use friend format.
> What is the friend format for? [...]
It ensures that the allocated bitmap is in the same (pixel) format as that of
its friend.
E.g. if you blit a chunky bitmap (8 planes) to a 16 bit screen (as the previous
example hinted) then the system needs to convert each pixel from 8 bit to 16
bit, using a palette lookup table, thus gets really slow. So always supply a
friend bitmap, if you need to blit a lot from it.
Regards Allan
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