...the whole metadata loading
Don't drop non-utf8 values from gexiv2 when serializing to XML,
instead, base64 encode them. This should be robust against whatever
garbage data is in tags.
Rationals have integers as nominator and denominator, so we can't set
something like "300.5/1". Instead, multiply the nominator and
denominator of non-integer ppi values until the error is smaller than
0.01, or the denomiator reaches 100 ("300.5/1" becomes "601/2").
...the whole metadata loading
Don't serialize a value that does not UTF-8-validate to XML. This is
not a real fix, but no matter what we do here in the future, UTF-8
validation should always be part of the serialization, in order to
avoid passing broken data into the core.
Based on original patches from Hartmut Kuhse and modified
by Michael Natterer. Changes include:
- remove libexif dependency and add a hard dependency on gexiv2
- typedef GExiv2Metadata to GimpMetadata to avoid having to
include gexiv2 globally
- add basic GimpMetadata handling functions to libgimpbase
- add image and image file specific metadata functions to libgimp,
including the exif orientation image rotate dialog
- port plug-ins to use the new APIs
- port file-tiff-save's UI to GtkBuilder
- add new plug-in "metadata" to view the image's metadata
- keep metadata around as GimpImage member in the core
- update the image's metadata on image size, resolution and precision
changes
- obsolete the old metadata parasites
- migrate the old parasites to new GimpMetadata object on XCF load
