[PATCH] TortoiseIDiff optionally using FreeImage.dll for image loading

Hi All,

                I've concocted a quick & dirty patch to use the
FreeImage library from within TortoiseIDiff. The key thing is that it
only uses the FreeImage.dll functionality if the DLL is available,
otherwise it just uses the existing code-path (GDI+).

It's taken a bit of work to do the dynamic linking (function pointer
syntax is always ugly), but hopefully it's a nice compromise between
binary bloat & supporting loads of image formats - including DDS.

To try it out simply compile a patched TortoiseIDiff.exe, drop the
FreeImage.dll (see http://freeimage.sourceforge.net/download.html) next
to it & run the app.

Although the code isn't pretty (& it could use a little more error
checking); it should do the job.

Cheers,

                Will.

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