color: Replace color components union with property functions

[0xEAB]

In its current form, this is a breaking change suitable for arsd 12 or a later major release.

getter+setter vs. union

Color.components is turned into ubyte[4]. Unlike an anonymous union, this works with CTFE as well.

r, g, b, a and asUint are turned into getter + setter functions.

A sufficiently good optimizing compiler will generate the same code for these as it would previously have with the union. (Note that this cannot be confirmed with DMD’s built-in profiler as it’s implementation will poison any getter/setter functions.)

alias this

The alias this stems from my codebase which did use it to simplify certain implementation details. I’m not sure whether it’s a good thing or even worth it.

/+ code sample +/
foreach (immutable idx, ref component; pixelDestination) {}
/+ vs +/
foreach (immutable idx, ref component; pixelDestination.components) {}

[0xEAB]

I’d like to hear your opinion on this, @adamdruppe.

My motivation behind this change is to get arsd to act more or less like a drop-in replacement and make it more convenient to use. While I tried to make it work like the previous implementation for most cases, I don’t have any data on this change’s actual impact on backwards compatibility, to be honest.

[0xEAB]

I’ve updated this patch. Not sure what to do with it. No longer sure whether it adds value.

[0xEAB]

No longer sure whether it adds value.

Well, it removes an anonymous union. Could be an advantage.

[0xEAB]

@adamdruppe Any comments/suggestions? :)

[adamdruppe]

i kinda forgot about this one lol lemme look at it again

[adamdruppe]

well looking it back over it looks ok enough. i can go ahead and merge if you wanna

[0xEAB]

Any suggestions to improve it?