So I am using Unity, I have a large sprite and a small sprite that I am merging with SetPixel, in code c#.

This was working fine while both sprites was the same size as I would just multiply the two pixels. Now when I try it I get an error because it doesn't fill the array, so I filled in with a blank vector, it works, except now the sprite is in the upper left corner.

What is the math for merging any larger sprite with a smaller one at it's center?

So I found a fix: just move the X by (sprite.width- sprite2.width) /2 and move the Y by (sprite.height- sprite2.height)/2.

Then you need two branches to prevent the getPixel from reading sprites that isn't there.

I would still appreciate a cleaner solution because this uses a while loop to adjust the pixels and is slow. Where my other one uses the rectangle of the sprite from the texture and isn't even noticed.