On Tue, May 25, 2010 at 03:09:27PM +0100, Richard W.M. Jones wrote: > On Tue, May 25, 2010 at 02:57:37PM +0100, Bastien Nocera wrote: > > On Tue, 2010-05-25 at 15:27 +0200, Alexander Larsson wrote: > > <snip> > > > > There's also this project, to add hardware acceleration (SSE and so > > > > on) to libjpeg: > > > > > > > > http://libjpeg-turbo.virtualgl.org/ > > > > > > > > If we're going to switch, maybe this is a good choice. > > > > > > I did some profiling of this for the spice project, and it performed > > > very well. I would very much like this to be in fedora, either as a > > > separate library or as a replacement for libjpeg. > > > > > > It is binary compatible with libjpeg, but contains some extra API not > > > supported by the normal libjpeg. > > > > Which means you'll have to make a choice as to which one to support if > > you want to handle JPEG files, and that we'll have to fix upgrades and > > new installations to install the preferred one, as they would have the > > same soname. > > Why couldn't we just replace libjpeg with the libjpeg-turbo upstream? > (For the primary architectures anyway). > The issue would be that it's a fork. So libjpeg from the independent jpeg group and libjpeg-turbo can gain incompatible API in isolation from each other. (The situtation seems a bit complex, there's three projects that I can see working on libjpeg: * libjpeg.sf.net -- working on API compatible updates to libjpeg-6b * independent jpeg group (one person?) -- working on jpeg-8b and beyond * libjpeg-turbo -- seems to be based on libjpeg-6b has speedups on modern x86 (w/SSE), licensed under the wxwindows license instead of BSD due to using code from that project. (according to the README in libjpeg-turbo, wxwindows license is a less restrictive form of the LGPL -- it allows static linking without the resulting work having to take on the LGPL license.) tgl, is this your understanding of the separate projects as well? -Toshio
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