Arithmetic coding is a feature of the JPEG standard. Although libjpeg
had always implemented arithmetic coding, it was compiled out by default
due to patents.
Those patents have now expired.
libjpeg 8 now enables arithmetic coding by default. Distributions which
use libjpeg < 8 can also support arithmetic coding by using the
appropriate CFLAGS to enable it. libjpeg-turbo 1.3.1 also has support
for arithmetic coding and is in popular shipping distributions.
Software such as jpegtran can losslessly convert Huffman compressed
images to arithmetic coding and vice versa. The lossy behavior of JPEG
does not happen at this (bit coding) layer of the format.
This initial patch provides a checkbox (disabled by default) to create
files which use arithmetic coding. It also has a tooltip warning that
such files may not be compatible with older decoders.
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
2009-01-17 Michael Natterer <mitch@gimp.org>
* all files with a GPL header and all COPYING files:
Change licence to GPLv3 (and to LGPLv3 for libgimp).
Cleaned up some copyright headers and regenerated the parsers in
the ImageMap plugin.
svn path=/trunk/; revision=27913
2008-09-25 Sven Neumann <sven@gimp.org>
* plug-ins/file-jpeg/jpeg.[ch]
* plug-ins/file-jpeg/jpeg-save.[ch]
* plug-ins/file-jpeg/jpeg-settings.[ch]: introduced an enum for
the subsampling factor.
svn path=/trunk/; revision=27056
2008-08-11 Michael Natterer <mitch@gimp.org>
* plug-ins/bmp/*
* plug-ins/faxg3/*
* plug-ins/fits/*
* plug-ins/fli/*
* plug-ins/ico/*
* plug-ins/jpeg/*
* plug-ins/psd/*
* plug-ins/sgi/*
* plug-ins/uri/*
* plug-ins/xjt/*: removed these...
* plug-ins/file-bmp/*
* plug-ins/file-faxg3/*
* plug-ins/file-fits/*
* plug-ins/file-fli/*
* plug-ins/file-ico/*
* plug-ins/file-jpeg/*
* plug-ins/file-psd/*
* plug-ins/file-sgi/*
* plug-ins/file-uri/*
* plug-ins/file-xjt/*: and moved them here. Changed executable
names to "file-foo".
* plug-ins/Makefile.am: changed accordingly.
* plug-ins/common/*: rename all file plug-ins to file-foo.c. Get
rid of the names "poppler" and "postscript" and call them
"file-pdf" and "file-ps" because the conflict with standard
autofoo targets is gone.
* plug-ins/common/plugin-defs.pl: changed accordingly.
* plug-ins/common/mkgen.pl: make sure cflags variables are named
"PLUG_IN_NAME_CFLAGS" and not "PLUG-IN-NAME_CFLAGS"
* plug-ins/common/Makefile.am: regenerated.
* configure.in: change folders and variable names to match above
changes.
svn path=/trunk/; revision=26494
