[FFmpeg-devel] [PATCH] imgconvert: add macro pixdesc_has_alpha for checking if a pixel format has an alpha component

[Michael Niedermayer]

On Thu, Mar 08, 2012 at 02:44:47PM +0100, Stefano Sabatini wrote:
> Reduce redundancy and simplify.
> ---
>  libavcodec/imgconvert.c |   21 ++++++---------------
>  1 files changed, 6 insertions(+), 15 deletions(-)
> 
> diff --git a/libavcodec/imgconvert.c b/libavcodec/imgconvert.c
> index 058a0d5..0d1ce3f 100644
> --- a/libavcodec/imgconvert.c
> +++ b/libavcodec/imgconvert.c
> @@ -55,9 +55,12 @@
>  #define deinterlace_line         deinterlace_line_c
>  #endif
>  
> +#define pixdesc_has_alpha(pix_desc)                                     \
> +    (pix_desc->nb_components == 2 || pix_desc->nb_components == 4       \
> +     || pix_desc->flags & PIX_FMT_PAL)

does this match is_alpha for all pix fmts ?

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

If a bugfix only changes things apparently unrelated to the bug with no
further explanation, that is a good sign that the bugfix is wrong.
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