Decode images that are not saved to disk
Decode images that are not saved to disk

This fixes #742.

marco-dev/c-geo-opensource,madankb/cgeo,pstorch/cgeo,marco-dev/c-geo-opensource,brok85/cgeo,vishwakulkarni/cgeo,rsudev/c-geo-opensource,rsudev/c-geo-opensource,Bananeweizen/cgeo,auricgoldfinger/cgeo,tobiasge/cgeo,mucek4/cgeo,tobiasge/cgeo,matej116/cgeo,kumy/cgeo,kumy/cgeo,lewurm/cgeo,samueltardieu/cgeo,Bananeweizen/cgeo,auricgoldfinger/cgeo,matej116/cgeo,ThibaultR/cgeo,pstorch/cgeo,xiaoyanit/cgeo,yummy222/cgeo,SammysHP/cgeo,Huertix/cgeo,Bananeweizen/cgeo,madankb/cgeo,KublaikhanGeek/cgeo,S-Bartfast/cgeo,lewurm/cgeo,superspindel/cgeo,schwabe/cgeo,cgeo/cgeo,SammysHP/cgeo,mucek4/cgeo,rsudev/c-geo-opensource,lewurm/cgeo,cgeo/cgeo,vishwakulkarni/cgeo,vishwakulkarni/cgeo,yummy222/cgeo,cgeo/cgeo,marco-dev/c-geo-opensource,matej116/cgeo,xiaoyanit/cgeo,ThibaultR/cgeo,Huertix/cgeo,Huertix/cgeo,samueltardieu/cgeo,madankb/cgeo,schwabe/cgeo,kumy/cgeo,auricgoldfinger/cgeo,schwabe/cgeo,yummy222/cgeo,ThibaultR/cgeo,brok85/cgeo,cgeo/cgeo,S-Bartfast/cgeo,pstorch/cgeo,xiaoyanit/cgeo,schwabe/cgeo,superspindel/cgeo,tobiasge/cgeo,mucek4/cgeo,SammysHP/cgeo,KublaikhanGeek/cgeo,S-Bartfast/cgeo,brok85/cgeo,KublaikhanGeek/cgeo,samueltardieu/cgeo,superspindel/cgeo