More LibPng!

http://old.nabble.com/problem-using-png_set_tRNS-td13425379.html
the only way to add a transparent color using is ... to manually search and swap in IDAT.

PNG is the worst graphics format ever! Use GIF or TGA where possible.

>>8
GPUs are thousands of times faster at drawing transparent and translucent images than software routines running on a CPU.