[ptx] windows pairwise optimizer bug fixed

[Rik Littlefield]

Pablo, thanks for tracking down this problem.  This finally explains why 
the mingw dll worked but the MSVC one did not -- MSVC cannot necessarily 
free() what mingw alloc'd.

But now I guess I can expect another round of reports about strange 
behavior of the optimizer ;-)

I will do my best to answer as they come in. 

Where can I download a Windows version of hugin with these mods?

--Rik

Pablo d'Angelo wrote:

>Hi,
>
>I finally found out what the cause for the crash of the pairwise
>optimisation on Windows was:
>
>On windows, one cannot assume that memory that is allocated with
>malloc() can be freed again with free().
>
>It only works if the dll and the application are build against the same
>runtime library.
>
>The panotools library build with Visual C was compiled against a different
>runtime than the mingw produced executables, leading to a crash, since hugin
>used some pano12.dll function to clean up data structures allocated within
>hugin.
>
>Now, I duplicated the release code inside hugin, and everything seems to
>work fine.
>
>I have also changed the optimisation code, now it uses the pano12
>optimisation routine, that is the optimizer by Rik Littlefield.
>
>ciao
>  Pablo
>
>  
>