Turns out it was all easier than I was expecting because I use 1 byte to store 4bpp (16 colours), so I have *checks notes* 4 bits that aren't used.
So basically, any color over 15 is *transparent*. No need for a mask 🤦♂️
Turns out it was all easier than I was expecting because I use 1 byte to store 4bpp (16 colours), so I have *checks notes* 4 bits that aren't used.
So basically, any color over 15 is *transparent*. No need for a mask 🤦♂️