> Thanks I just tried half the choices using
>
> argb->SetPorterDuff  (argb, DSPD_SRC_OUT );
>
> and there was no difference in any setting, so I am assuming the
> directfb implementation on the smp8635 doesn't support this.

Something should change necessarily. DirectFB library has software
fallbacks for most declared functions.
Be sure that your source code are correct, e.g.

SetPorterDuff(argb, DSPD_SRC_OUT);
SetBlittingFlags(argb, DSBLIT_BLEND_ALPHACHANNEL);
Blit(argb, surf, &rect, 0, 0);

-- 
Best Regards
Nikita Egorov
nik...@gmail.com
nik...@varma-el.com
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