[Scummvm-devel] Non-hardcoded gameids

Marcus Comstedt marcus at mc.pp.se
Wed May 31 07:52:02 CEST 2006

Marcus Comstedt <marcus at mc.pp.se> writes:

> On the Dreamcast, the overlay is in ARGB4444 format, so you specify
> transparency with the 4 most significant bits.  All other backends
> have opaque overlays, without transparency support, I think.

I should add that there is a backend function ARGBToColor() you can use
to convert a quadruple <a,r,g,b> of bytes to whatever pixel format that
the overlay uses.  But unless the overlay supports alpha, as indicated by
kFeatureOverlaySupportsAlpha, the "a" component will just be discarded.

   // Marcus

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