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Clean up reading TIFF headers
Allan Sandfeld Jensen authored
Split reading TIFF headers from the decoding to make it
possible to read correct metadata on undecoded images.

This fixes reading the image format from the QImageReader,
and is necessary for later patches.

Change-Id: Ida27e98252bf95459d87354586d4a5fba348efcb
Reviewed-by: default avatarIvan Komissarov <ABBAPOH@gmail.com>
Reviewed-by: default avatarKonstantin Ritt <ritt.ks@gmail.com>
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