How do I get at the "flip" int in libraw_image_sizes_t?

[MikePelton]

Hi - am trying to stop libraw from rotating images which I understand can be achieved by setting the flip variable in the ...image_sizes struct to 0. However I can't see access to that struct via rawlib.cs (I may be missing something obvious of course). Alternatively if I can intercept the EXIF data being read as the file's being opened I could know the original orientation and reverse libraw's rotation in separate code, but I'm not seeing an example of how to interpret the data being passed into EXIFParserCallback(IntPtr context, int tag, int type, int len, uint ord, IntPtr ifp, long _base), specifically how do I read data off the IntPtr ifp? All help welcome - thanks!

[laheller]

Hi!
@MikePelton

That structure is not directly exposed in SharpLibraw. I will try to implement in the next version.
Or you can try to do it an create a pull request.

BR,

Ladislav

[MikePelton]

Hi Ladislav and thanks for coming back - we have a sub-optimal workaround, but a workaround nevertheless, which means I'm more than happy to wait for your updates - I suspect you'll do a much better job than me of marshalling that structure :-)

[laheller]

Can u please share your solution?

[MikePelton]

It's brute force I'm afraid - we read the image twice - once to get its orientation and then again to apply a correcting transform. We consume hundreds of images from any one camera which is fixed in a rig, so we only need one read to tell us the orientation and can then apply the same transform to the whole feed. Nothing clever I'm afraid!

[laheller]

No problem. Anyway I cannot tell you right now, when I will implement that struc. So far let's keep this issue open.