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DirectDraw Transparencies
Did you make sure to use SetColorKey() on the source surface?
Yes, here is the complete blt code snippet
ClearBuffer(destination);
ddck.dwColorSpaceLowValue = 0;
ddck.dwColorSpaceHighValue = 0;
hres = destination->SetColorKey(DDCKEY_SRCBLT,&ddck);
if(hres != DD_OK)
//error setting colorkey for surface
hres = destination->Blt(NULL,source, NULL, DDBLT_KEYSRC | DDBLT_WAIT, NULL);
if(hres != DD_OK)
hres = destination->BltFast(0,0,source,NULL, DDBLTFAST_SRCCOLORKEY | DDBLTFAST_WAIT );
if(hres != DD_OK)
//error
Does anyone know what would cause the blt and bltfast functions to return a DDERR_INVALIDPARAMS while trying to use DDBLT_KEYSRC or DDBLTFAST_SRCCOLORKEY. I've looked at some older programs, and other samples and they have the same code. Here's the line:
lpddsback->blt(NULL,source,NULL, DDBLT_KEYSRC | DDBLT_WAIT, NULL);
Thanks in advance,
Doug
ah ok. I think everything is working now. I misread the entry. I was setting the Colorkey on the wrong surface. Thank you so very much 
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