Review Request: Jpeg thumbnailer honouring jpeg rotation info

[Jacopo De Simoi]

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http://reviewboard.kde.org/r/1444/
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Review request for kdelibs.


Summary
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This patch makes the jpeg thumbnailer honor jpeg rotation infos stored in exif metadata. 
The method is quite simple, although I don't like ifdefs, this time they seem to me to be necessary.
It's my first nontrivial CMake modification; please check that I did not do something stupid there.
Also, the orientationMatrix method could be ifdeffed if you feel it is necessary; I just didn't want to add another ifdef.

I am not sure if this is a good solution performance-wise; please comment on that if you have better ideas.


Diffs
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  branches/KDE/4.3/kdebase/runtime/kioslave/thumbnail/CMakeLists.txt 1016603 
  branches/KDE/4.3/kdebase/runtime/kioslave/thumbnail/jpegcreator.h 1016603 
  branches/KDE/4.3/kdebase/runtime/kioslave/thumbnail/jpegcreator.cpp 1016603 

Diff: http://reviewboard.kde.org/r/1444/diff


Testing
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Works good with a *clean* .thumbnails directory. Cached thumbnails are indeed a problem; not sure how to solve this issue yet.


Screenshots
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Dolphin showing correctly rotated jpegs
  http://reviewboard.kde.org/r/1444/s/192/


Thanks,

Jacopo