Re: [pygame] Feature discussion, proposals

[Mikhail V <mikhailwas@xxxxxxxxx>]

>> - how does the indexed image is generally rendered? Is it like: it sends
>> index array to video card and the card makes substitution?
>
> Personally I would forget about optimisation and
> only use indexed surfaces if it simplified my program
> logic. For performance, I trust convert() and
> convert_alpha() to know more about the system it's
> running on than I do.
>
> --
> Greg


Okay, here is a simple example, which shows some odd behaviour in pygame.
I have initialised display and some surface, like this:

DISP = pygame.display.set_mode((w, h), 0, 8)
window = pygame.Surface((w, h), 0, 8)

Now I set palette for DISP then put data from uint8 array directly on DISP:

bv = DISP.get_view("0")
bv.write(myarray.tostring())

Everything is shown OK. But if I put my array in 'window' first and
then blit it to DISP I get garbage.
HOW IS THAT?
I can see correct values only if I explicitly set same palette to
'window'. So it is contrary to any expectations.
I can understand if my DISP were rgb 24 or 32 bit surface then it
should always resolve colors by blitting. But how does my data
go corrupt if I blit between 8 bit surfaces and 8 bit display? Those
are just an array of indexes.
What I am missing or doing wrong? If it is normal behavior then it
seems to be wrong, since it performs some parasitic operation on my
array which also result in false picture on the end.

Regards,
Mikhail