On Sat, 19 Jan 2013, Tomasz Pala wrote: > On Fri, Jan 18, 2013 at 17:41:29 +0100, Jakub Bogusz wrote: > > >> - why 7+? > > > > Quoting original post: > [...] > > the implementation of the libjpeg v7+ API and ABI would remain just > > that: an emulation and not a feature-complete implementation of jpeg-7 > > or jpeg-8." > > - I recall no reports of missing features in turbo (shipped and used as so.8), > so maybe they are so rarely used (if any at all) that we shouldn't care, > - ABI is emulated, so in case of such report (3rd party app?) user > should simply switch to IJG's .so.8 (that we shall provide as well). > > >> - are there any apps like this? > > > > I'm not sure, it needs checking. > > > > Also, I don't know if libjpeg-turbo supports compilation as 12-bit. > > http://sourceforge.net/p/libjpeg-turbo/discussion/1086868/thread/f4639c19/ > http://sourceforge.net/p/libjpeg-turbo/discussion/1086868/thread/701941fc/ > > libjpeg-turbo doesn't provide any performance advantage over libjpeg for > 12-bit data, and it isn't possible to use libjpeg-turbo for both 8-bit and > 12-bit data at the same time. Thus, either way, you're going to end up having > to call two different libraries if you want to support both 8-bit and 12-bit > JPEGs in the same application. At the moment, you're better off using the > upstream libjpeg code for 12-bit, since they actually test 12-bit data. > > > libtiff can use both 8- and 12-bit variants of libjpeg (both formats > > can be embedded in TIFF). > > Should we use 8-bit libjpeg-turbo and 12-bit IJG libjpeg? > > As far as I understand it properly, 12-bit libs can't handle 8-bit > JPEGs, so we shouldn't replace any lib with 12-bit version. IMHO we > should have: > > libjpeg-turbo with 8-bit jpeg.so.8 > libjpeg with 8-bit jpeg.so.8 (for people that found missing/not > emulated features, > or use hardware without SIMD) > libjpeg9 for some new apps, that might arise > libjpeg[89] in 12-bit variant as low-priority option (not used anyway).
I second that, it looks to be the best solution. -- Jan Rękorajski | PLD/Linux SysAdm | http://www.pld-linux.org/ baggins<at>mimuw.edu.pl baggins<at>pld-linux.org _______________________________________________ pld-devel-en mailing list [email protected] http://lists.pld-linux.org/mailman/listinfo/pld-devel-en
