[Vm-dev] Fwd: [Pkg-squeak-devel] Bug#744289: scratch: Impossible
importing or using jpeg files
David T. Lewis
lewis at mail.msen.com
Mon Apr 14 22:55:39 UTC 2014
On Mon, Apr 14, 2014 at 09:50:28AM -0700, tim Rowledge wrote:
>
> IIRC ubuntu is a Debian derivative. Debian patches the vm source pre-build and carefully, oh so carefully, buggers it up.
>
> For the Pi Scratch package we have to un-screw it. The jpeg lib in Debian is broken. Don?t link to it. I suppose it is conceivable that the library changed in such a way that it needs slightly different tickling in order to work but that does not justify ham-handed firking with other people?s code that actually works.
> They also do a couple of other dumb changes that rather annoyed Ian when I pointed them out to him.
Ah, right. I see now that the note at the very bottom of this chain explains
that somebody (I'm not sure who) had previously screwed up the Debian build,
apparently in a well-intentioned but not entirely competent attempt to link
to the platform-supplied libjpeg. So that is what is causing the problem, and
this "improvement" to the Debian build needs to be removed until such time as
the Squeak JPEG plugin has actually been updated to use newer versions of the
library.
It is highly unlikely that there is anything wrong with libjpeg on Debian.
On the contrary, it is almost certainly an improvement over the old jpeg
code that we are using in platforms/Cross. So it would be nice if someone
did an update of the plugin to use platform-supplied libraries. But that
is not an excuse for breaking the system, so it needs to be done right.
Dave
>
> On 13-04-2014, at 6:30 PM, David T. Lewis <lewis at mail.msen.com> wrote:
>
> >
> > Thanks Bert,
> >
> > I tried installing a squeakvm with apt-get on my Ubuntu laptop. I'm assuming
> > this is probably the same as, or derived from, a Debian build. That VM exhibits
> > the problem described below, i.e. the plugin loads into Squeak but JPEG images
> > cannot be displayed.
> >
> > With a standard interpreter VM from squeakvm.org, there is no problem. I also
> > compiled an interpreter VM in 64 bit mode using the standard Cmake build system
> > from squeakvm.org, and this also works without problems (so it is not a 64-bit
> > issue).
> >
> > This suggests that the problem is somehow specific to the Debian build, but
> > I can't say what the cause might be.
> >
> > I'll note also that the Debian 64-bit build of squeakvm is not suitable for
> > use with Scratch, because it includes at least one plugin (the CameraPlugin)
> > that currently works only when compiled for 32-bits (again I am assuming
> > that my Ubuntu download is really coming from Debian, hope I have that right).
> >
> > I am CCing Miriam and Jos? Luis on this. I'm sorry I cannot see the cause
> > of the problem, but maybe knowing that it works properly on a standard
> > squeakvm Cmake build will help.
> >
> > r.e. use of old libjeg sources: Yes it would be nice if someone updated the
> > Squeak JPEGReaderPlugin to use up to date libraries. As far as I know, nobody
> > is working on that right now, but a volunteer would be welcome. In the mean
> > time, the current source base seems to work acceptably for Squeak and Scratch.
> >
> > Dave
> >
> > On Sun, Apr 13, 2014 at 12:21:27PM -0700, Bert Freudenberg wrote:
> >>
> >> Begin forwarded message:
> >>
> >>> From: Jos? Luis Redrejo Rodr?guez <jredrejo at debian.org>
> >>> Subject: Re: [Pkg-squeak-devel] Bug#744289: scratch: Impossible importing or using jpeg files
> >>> Date: 12. April 2014 10:22:30 GMT-7
> >>> To: Miriam Ruiz <miriam at debian.org>
> >>> Cc: pkg-squeak-devel at lists.alioth.debian.org
> >>>
> >>> mmm, I don't think compiling squeak-vm against the ancient libjpeg
> >>> sources bundled with squeak sources instead system libjpeg is a good
> >>> idea.
> >>> Instead of it, the JPEGReaderPlugin should be fixed to work correctly
> >>> with a modern jpeg library, but I don't feel with the needed time
> >>> and/or knowledge to fix that currently. I'm afraid I've forgotten most
> >>> of my Smalltalk skills in the last years :(
> >>>
> >>> Regards.
> >>> Jos? L.
> >>>
> >>> 2014-04-12 18:22 GMT+02:00 Miriam Ruiz <miriam at debian.org>:
> >>>> Hi!
> >>>>
> >>>> I've received this bug report for Scratch, but according to what is
> >>>> said in the forums of the Raspberry Pi device, it might belong to
> >>>> squeak-vm instead.
> >>>>
> >>>> Any thoughts about it?
> >>>>
> >>>> Thanks,
> >>>> Miry
> >>>>
> >>>>
> >>>>
> >>>> ---------- Forwarded message ----------
> >>>> From: gea <geaplanet at yahoo.es>
> >>>> Date: 2014-04-12 16:16 GMT+02:00
> >>>> Subject: Bug#744289: scratch: Impossible importing or using jpeg files
> >>>> To: Debian Bug Tracking System <submit at bugs.debian.org>
> >>>>
> >>>>
> >>>> Package: scratch
> >>>> Version: 1.4.0.6~dfsg1-5
> >>>> Severity: normal
> >>>>
> >>>> Dear Maintainer,
> >>>>
> >>>> In the last versions of Scratch it is impossible to import jpeg files.
> >>>> With png works perfectly, but you find problems with jpeg. The program doesn't
> >>>> complain in any way but after you select an image jpg (for example in
> >>>> backgrounds) to use it, it is like if you were did not anything.
> >>>>
> >>>> I think something is missing, perhaps the jpeg plugin, because I remember there
> >>>> was one in 1.3 version, but it is not present in 1.4.
> >>>>
> >>>>
> >>>> Thanks in advance.
> >>>>
> >>>>
> >>>>
> >>>> -- System Information:
> >>>> Debian Release: wheezy/sid
> >>>> APT prefers unstable
> >>>> APT policy: (500, 'unstable')
> >>>> Architecture: i386 (i686)
> >>>>
> >>>> Kernel: Linux 3.10.1-picaros (SMP w/4 CPU cores)
> >>>> Locale: LANG=es_ES.UTF-8, LC_CTYPE=es_ES.UTF-8 (charmap=UTF-8)
> >>>> Shell: /bin/sh linked to /bin/dash
> >>>>
> >>>> Versions of packages scratch depends on:
> >>>> ii libgtk2.0-bin 2.24.22-1
> >>>> ii shared-mime-info 1.0-1+b1
> >>>> ii squeak-plugins-scratch 1.4.0.2~svn.r83-1
> >>>> ii squeak-vm 1:4.10.2.2614-1
> >>>>
> >>>> scratch recommends no packages.
> >>>>
> >>>> Versions of packages scratch suggests:
> >>>> ii pulseaudio 4.0-6+b1
> >>>>
> >>>> -- no debconf information
> >>>>
> >>>>
> >>>> ---------- Forwarded message ----------
> >>>> From: Miriam Ruiz <miriam at debian.org>
> >>>> Date: 2014-04-12 17:36 GMT+02:00
> >>>> Subject: Re: Bug#744289: scratch: Impossible importing or using jpeg files
> >>>> To: gea <geaplanet at yahoo.es>, 744289 at bugs.debian.org
> >>>>
> >>>>
> >>>> It might be related to the Squeak VM over which Scratch is executed,
> >>>> but I need to check it:
> >>>>
> >>>> ?Me and Tim discussed this, and I've found a fix. The issue is due to
> >>>> the Debian package inheriting a patch from the original Debian
> >>>> packager making it link against the system libjpeg (rather than the
> >>>> rather ancient libjpeg bundled in the squeak-vm sources). For some
> >>>> reason, it seems squeak-vm isn't happy working with the newer libjpeg,
> >>>> so I've removed that patch and it all seems well. I'll post here when
> >>>> the updated squeak-vm is added to the repository, which should be
> >>>> tomorrow.? ( http://www.raspberrypi.org/forums/viewtopic.php?f=77&t=15583&start=25
> >>>> )
> >>>
> >>> _______________________________________________
> >>> Pkg-squeak-devel mailing list
> >>> Pkg-squeak-devel at lists.alioth.debian.org
> >>> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-squeak-devel
> >>
> >
> >
> >
>
>
> tim
> --
> tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
> Useful random insult:- Not an idiot, but plays one in his life.
>
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