huge image - memory management

[zebastian]

on really huge images (eg 10000 * 50000) the program is not capable of allocating memory in cImage::AllocMem.
But instead of throwing an badalloc error in any way, the program crashes.
It would be good to have a way of reading available memory, checking against GetUsedMB, and then throwing error / allocation. (could still fail, but better than nothing)
There is neither a builtin way for c++ to do that, nor for qt. So we would be forced to use some hackish platform dependent code like:
http://stackoverflow.com/questions/8122277/getting-memory-information-with-qt?answertab=votes#tab-top

Or we could try to use some other allocating method, to prevent the rest of the program to crash.
Opinions appreciated :)

[zebastian]

fixed with fb0a9fb
bad alloc is catchable, if memory gets freed directly and top level handles "not prepared cimage" accordingly