I looked at examples of working with images, but have not yet understood which approaches are most effective in terms of performance. Tell me, please, what controls and classes can I use to remove the transparent area around the sprite?
My sprites are stored in PNG files (32 bits, RGBA).
I need:
1. open sprite image from file.
2. calculate the rectangle bounding the opaque area of the sprite.
2. remove the transparent area around.
3. save the result to a PNG file.