Fill texture alpha with color

Hi guys,

I want to create rounded buttons based on this texture :



What I'd like to do is fill the alpha inside the white circle with any color and generate buttons when it's done.

How could I do that ?

Thanks !

 

You can use a flood-fill algorithm, explained here:
http://en.wikipedia.org/wiki/Flood_fill

Here is what you need in Unity:
http://docs.unity3d.com/ScriptReference/Texture2D.GetPixels.html
http://docs.unity3d.com/ScriptReference/Texture2D.SetPixels.html

But you can pre-fill it with a special color (like the green screen used in movies) and then replace that special color for better performance.