To detect an area of a PNG that is not transparent:
- You need to first get the buffer
- You need to get 32-bits reference of that buffer
- Scan 0 widths to find x1 edge
- Scan width 0 to find x2 edge
- Height to find the y1 edge
- Height 0 to find the y2 edge
To detect an area of a PNG that is not transparent: