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). -- Tomasz Pala <[email protected]> _______________________________________________ pld-devel-en mailing list [email protected] http://lists.pld-linux.org/mailman/listinfo/pld-devel-en
