Hello
I recently compiled libpng using the following xcode project: https://github.com/IGRSoft/libpng-xcode-project

Attempting to load a .png file always returns NULL, tried more than one file. Bmp loads fine through.
Also tested in both simulator and real device, no difference.

Ps: at first trying to build the app gave me an error:

Undefined symbols for architecture armv7:
"_png_init_filter_functions_neon", referenced from:

After a short google search I recompiled the library with this feature turned off. Could it be the reason?

Found the solution.

In xcode project settings -> build settings there is "compress png files" and "remove text metadata from png files" both must be set to NO.