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swscale: check flags instead of nb_components to find if pixel format have alpha

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-01-24 17:32:37 +00:00
parent 7003d650b0
commit d07b0d9927
1 changed files with 1 additions and 1 deletions
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2
libswscale/swscale_internal.h
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@ -688,7 +688,7 @@ static av_always_inline int isALPHA(enum AVPixelFormat pix_fmt)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
av_assert0(desc);
return desc->nb_components == 2 || desc->nb_components == 4;
return desc->flags & PIX_FMT_ALPHA;
}
#if 1