Thanks, will work on fixes tonight.
The current method will not detect an error when the image type
is not mapped but a color map is present.
At least I assume that is not a valid TGA file?
A non-mapped image may contain a color map ;-0 it's simply
discarded.
As per your ideas
return to!bool(isColorMapped(header)
? header.colorMapDepth.among(16, 32)
: header.pixelDepth.among(16, 32));
this is not nothrow, but as you can see there is nothing that can
ever throw.. so perhaps I'll stick to the cast(bool) thing.. Any
idea?