Brilliant, thanks a lot.
That works a treat, allowing me to use c1 + c2 when c1 :: RGB and
c2 :: ChangeChannelType!(RGB, int), say.
It's not happy with doubles atm, but presumably this is sorted in
your push. Thanks again :-)
On Monday, 19 January 2015 at 21:11:34 UTC, Vladimir Panteleev
wrote:
Hi Phil,
The Color template implements opCast for types with the same
set of fields, so you should be able to just cast a struct with
ubyte fields to one with double fields (or use std.conv.to).
The only restriction is that the fields must have the same
order.
You can use the ChangeChannelType template to create a Color
type from an existing one but a different type for the channel
fields, for example this assert will hold:
static assert(is(ChangeChannelType!(RGB, ushort) == RGB16));
To create a view with double-typed channels from an RGB view,
you can use colorMap:
alias doubleTypedView = colorMap!(c =>
cast(ChangeChannelType!(typeof(c), double))c);
You can use this as with any other view transform:
auto i = onePixel(L8(1));
auto d = i.doubleTypedView();
assert(d[0, 0].l == 1.0);
By the way, as I've never tried using floating-point types, the
code didn't quite work with them as it is, as some templates
expected integral types in a few places. I guess you've fixed
things on your side? Anyhow, I've now pushed a commit which
fixes and adds tests for FP types.
