[Ffmpeg-devel] swscaler equivalent to img_convert

[Michael Niedermayer]

Hi

On Sun, Feb 18, 2007 at 12:32:10PM +0100, GizmoSDK wrote:
> 
> 17 feb 2007 kl. 15.26 skrev Alex Beregszaszi:
> 
> >Hi,
> >
> >>Will there be a implementation of the img_convert using the swscaler
> >>option ?
> >>
> >>There is a difference in using scaler and convert when using RGBA32.
> >>The alpha value is set to zero in conversions in swscaler and in
> >>img_convert it is set to 0xff.
> >>
> >>I would prefer to have swscaler to set the alpha values to 0xff when
> >>converting from a non alpha format to RGBA32 or BGRA
> >
> >configure with --enable-swscaler. Also note that currently the builtin
> >scaler sets alpha to 0 too.
> >
> >--
> >Alex Beregszaszi
> 
> Well. That's what I wrote.
> 
> I think it would be good to have a compatible img_convert implemented  
> with swscaler when the --enable-swscaler is used. I think there are a  
> coule of important issues to be solved.
> 
> 1. img_convert should have a equiv implementation with sws_scale so  
> you can build compatible builds with or without --enable-swscaler

you can use swscale even if its disabled, it will use img_convert then
see ffmpeg.c


> 
> 2. The alpha values of sws_ routines should be set to 0xff when  
> creating alpha values out of non alpha source pixel formats as this  
> describes the opacity in most cases.

send patch and benchmark and we can disscuss it, i wont agree to this
without knowing what effect it has on speed

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The misfortune of the wise is better than the prosperity of the fool.
-- Epicurus
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