Fix to check valid pointer before using 'combine_image'
-rwxr-xr-x 2285 CMakeLists.txt
-rw-r--r-- 11558 LICENSE.APLv2.0
-rw-r--r-- 222 heif.pc.in
drwxr-xr-x - include
drwxr-xr-x - packaging
drwxr-xr-x - src
drwxr-xr-x - test