I am confused about how use the alpha channel with two surfaces on a
blit. I have a yuv surface that I want to blit to an argb surface
but I want to keep the alpha value of the argb surface. I have tried
several things, and this one that seems most logical clears my alpha
values
argb->SetDstBlendFunction(argb, DSBF_DESTALPHA);
argb->Blit(argb,yuv,NULL,0,0);
If it helps, the defaults are
Source blend function: DSBF_SRCALPHA
Destination blend function: DSBF_INVSRCALPHA
Any help would be appreciated.
Martin
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