| Re: [AD] Allegro 5 Graphic routines, alpha 4 |
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On February 23, 2002 06:25 pm, you wrote:
> Thomas Fjellstrom wrote:
> [snip]
>
> > Ive taken a litle look... Looks good. I didnt see a method to draw yuv
> > colorspace bitmaps... what I mean is hardware accelerated yuv drawing...
> > My card supports it. And it would be usefull to video libraries and the
> > scientific comunity.
>
> I just added the code for HSV, since I can use Allegro 4.0's conversion
> routines. YUV is a bit more complicated - there's no one format that
> everyone agrees on.
>
> For example, there's YUVI, where each pixel is 16 bits, but you need to
> read 32-bits to compose the color as the pixels are interleaved in a really
> screwed up way...
> It looks something like: Y0 U0 V0 U1 Y2 U2 V2 U3, with 8 bits per
> component.
>
> If someone sends me a routine to do the conversion, then there's no problem
> - I can add it easily. Otherwise, I'll have to hack around a bit until I
> find something that fits well with the way Allegro likes BITMAPs to be...
:) I know. there are many 'yuv' formats.. like I belive my card does yuy2 and
yv12. :) Its fun stuff. But at least in X you can use the XV extenetion to
use them. and Xine has some really nice yuv conversion code.
--
Thomas Fjellstrom
tfjellstrom@xxxxxxxxxx
http://strangesoft.net