On Mon, Jan 09, 2017 at 03:26:30PM -0500, LM wrote: > >On Sun, 2017-01-08 at 23:42 -0500, Michael Shell wrote: > >> Does anyone know if any other applications also rely on this > >> animation patch for libpng? Kind of a bad spot to be in to depend > >> on functionality that the libpng developers won't accept into the > >> mainstream. > On Mon, Simon Geard wrote: > > Not aware of anything. As you say, it's pretty much a Firefox-only > > patch... I don't even know why they bother, since I can't say I've ever > > seen an APNG file in the wild. Neither IE/Edge or Chrome support the > > format, so I doubt there are many sites which used them. > > There's a series of APNG command line tools at Sourceforge that I've > built before: > apng2gif > apngasm > apngdis > apngopt > gif2apng > > They all work with the apng format. Don't remember them requiring the > libpng patch to work. > > Typically I use animated GIF when I need an animated graphics format. > I think some other web developers use that format as well (or they do > graphics animation with JavaScript). gifsicle is useful in creating > animated GIF formats. > > Sincerely, > Laura > http://www.distasis.com/cpp/osrclist.htm
As the person who proposed adding the apng patch to the firefox build, I've often regretted doing that. Unfortunately, from time to time firefox appears to be tardy in patching png vulnerabilities so on balance I think we are safer with it - even though the big distros didn't do as I expected (i.e. they dropped it because libpng had rejected it). Back in the day (gif was arguably patented in some places, I think) the png people came up with mng. At one time I used to know where to find an example (in the kde3 days, I guess) but nowadays all I am aware of are animated GIFs. I think it is naother of those things where somebody at mozilla thought "let's do this" and now it is hard-baked into the firefox infrastructure, like a lot of other cruft. The apng patch developer/maintainer is in Japan, perhaps there are some animated png files in use there. Of course, if I did accidentally come across one I very much doubt that I would realise it was an apng. ĸen -- `I shall take my mountains', said Lu-Tze. `The climate will be good for them.' -- Small Gods -- http://lists.linuxfromscratch.org/listinfo/blfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page
