CODEWITHSUNDEEP
sdlsdl-2
Diaz
Diaz

Reputation: 987

SDL_image.h won't load jpg / png files?

I was using SDL2 and its extension libs under Linux. Here are the steps I took to build SDL_image lib:

  1. Download libjpeg source, then standard 'configure;make;make install'
  2. Download SDL_image source, standard 'configure;make;make install'

I did the same for libpng So I'll omit the steps here.

When I tried to load a jpg file and a png file, respectively, I got the following error message: (ignore the prefix added by myself. The latter part came from SDL_GetError)

SDL_CTexture::load error: JPEG loading error
SDL_CRenderer:copy error: Invalid texture

for png:

SDL_CTexture::load error: Failed loading png_set_longjmp_fn: /lib/i386-linux-gnu/libpng12.so.0: undefined symbol: _png_set_longjmp_fn
SDL_CRenderer:copy error: Invalid texture

By the way, 'make check' gave a long list of fail when I tried to build libpng. But I did installed zlib for libpng beforehand.

Any ideas?

PS. From output of running './configure' when building SDL_image, it said 'yes' to both libpng and libjpeg.

PPS. OK now I found out that SDL_image was getting linked to /lib/i386-linux-gnu/libpng12.so, but my newly built libpng was installed in /usr/local/lib. How can I tell SDL_image to link to the newer version? I tried copying newer libs(libpng16.so) to /lib/i386-linux-gnu, but it was still referring to the old libpnf12.so.

PPPS. Finally I got it work by renaming my libpng16.so to libpng12.so.0 and copied this file to /lib/i386..., where SDL_image was referring to. However there is no decency in this solution. I'm still looking for a way to tell SDL_image that "hey use this newer libpng!"

Upvotes: 2

Views: 2745

Answers (1)

Vincent Zgueb
Vincent Zgueb

Reputation: 1491

It seems you do not compile with the correct lib release. Try to force your linker to take the right version in configure.

Have a look there http://www.willusher.io/sdl2%20tutorials/2013/08/18/lesson-3-sdl-extension-libraries/ in the qa section, a guy had the same issue as you.

This answer could also help CMake Finding Libraries on Wrong Path

Upvotes: 1

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