[Development] Function to merge two QColor?

[Igor Khanin]

Hi,

I was recently looking for same while hacking on a platform theme. I 
think there is a bunch of stuff in qdrawhelper_p.h, but it seemed like 
too low level and scary. I ended up implementing color alpha blending 
myself, as the formula is pretty simple (just a linear combination of 
the RGB values using the foreground's alpha).

Best,
Igor

On 23/11/2025 21:17, Christian Ehrlicher via Development wrote:
> Hi,
>
> for the window11 style plugin I like to merge two QColors to avoid a 
> double painting. The first color has no alpha but the second. Is there 
> anything ready to use in Qt (internals) or do I have to write 
> something by my own?
>
>
> Thx,
> Christian