Transparency in 16-bit land

[R . Zane Rutledge]

Finally doing some graphics in 16-bit color, and I'm curious about 
direct color. I'm supposed to pass a direct color RGB565 value to 
BmpSetTransparentValue(), where that transparent value is defined 
(according to the manual) as UInt32.

First of all, shouldn't that passed value be only 16 bits? What's up 
with 32? And secondly (most importantly), what's the best/simplest way 
to finesse the needed red/green/blue values into the 565 form in C 
code? I'm probably being dense here, but this is momentarily confusing. 
It seems like most convenient API functions deal with RGBColorType 
values, rather than the 565 value directly...then this one threw me.

Thanks,
zane
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