[iOS] PNG fatal error: CgBI: unhandled critical chunk

[IrrlichtForiOS]

While we're using the Irrlicht 1.9.x development branch to access the iOS Implementation, we are not abled to load png files at the moment.

Every time we try to load a png file as texture we're getting

Code: Select all

PNG fatal error: CgBI: unhandled critical chunk
PNG fatal error: CgBI: unhandled critical chunk
Could not load texture: ecke1.png

Does somebody know the solution to this issue?

[CuteAlien]

Did it work before? Just wondering if it's something new or just something no one noticed before.

[hendu]

http://stackoverflow.com/questions/2065 ... ical-chunk

The PNG you are trying to read has been run through Apple's "Xcode" version of pngcrush, which creates files that aren't PNGs. I believe Apple's pngcrush also has the capability of undoing the damage and more-or-less restoring the original PNG, using the "-revert-iphone-optimizations" option, although it's not mathematically possible to restore the color channels exactly for transparent or semitransparent pixels.

[Vectrotek]

Hi! The previous post seems well informed, so I thought I might
mention this http://lodev.org/lodepng/ which is
a quite transparent resource on "*.png"..
I hope you can use it..

[IrrlichtForiOS]

Did it work before? Just wondering if it's something new or just something no one noticed before.

We'd never tested it before, but in our first project it works well.

@All: We found the solution to this problem by setting "Compress PNG Files" to No in the Xcode-Targets Build Settings.