[Mono-dev] Problem with PNG transparancy on current Debian Unstable

Tue Jun 9 14:10:50 UTC 2015

Hey,

https://bugzilla.novell.com/show_bug.cgi?id=324503
https://bugzilla.novell.com/show_bug.cgi?id=426305

Are the droids you're looking for.
On 9 Jun 2015 5:08 pm, "Benjamin Schieder" <benjamin at anderdonau.de> wrote:

> I'm pretty much happy that I got a usable workaround.
>
> Also, those bugs don't actually exist so it'd be difficult for someone
> with literally zero knowledge about the internal workings of libgdiplus or
> mono to do either.
>
> https://bugzilla.xamarin.com/show_bug.cgi?id=324503
> https://bugzilla.xamarin.com/show_bug.cgi?id=426305
>
>
> Am 2015-06-09 15:59, schrieb Andres G. Aragoneses:
>
>> Good job, now you should file the bug in http://bugzilla.xamarin.com/
>> and find a way to fix the bug in a way in which it doesn't make bug
>> 426305 or 324503 reappear.
>>
>> On 09/06/15 13:09, Benjamin Schieder wrote:
>>
>>> I have found the bad commit (and learned how to use git bisect in the
>>> process):
>>>
>>> [01:04:04][blindcoder at flora:~/Downloads/libgdiplus]$ git bisect bad
>>> 59ca17e56adb8555e9b4e0960b771f2849f6366f is the first bad commit
>>> commit 59ca17e56adb8555e9b4e0960b771f2849f6366f
>>> Author: Dick Porter <dick at acm.org>
>>> Date:   Thu Mar 31 16:02:19 2011 +0100
>>>
>>>      Don't premultiply PNG images on loading, no other format does this.
>>>
>>>      When drawing images, except when drawing onto a memory bitmap,
>>> premultiply
>>>      if needed.
>>>
>>>      Fixes bug 426305, without breaking bug 324503.
>>>
>>> :040000 040000 bc4a7075f87afdb5dc6e67c859cd82b06876d29e
>>> cf1cea632be730ad978409f224766097ba1382ea M    src
>>> [git:(59ca17e...)|BISECTING][A:0][D:0][M:1][?:5]
>>>
>>> If I check out 059ca56800ccca8249260fac5e9e8b45291b8237, the
>>> transparency is fine.
>>> When I update to 59ca17e56adb8555e9b4e0960b771f2849f6366f, the
>>> transparency is incorrect.
>>>
>>> Kind regards,
>>> Benjamin
>>>
>>> Am 2015-06-09 12:45, schrieb Alexander Köplinger:
>>>
>>>  There aren't that many commits for pngcodec.c in the last 4 years
>>>> (which is when 2.10 was tagged), so it's probably one of those:
>>>> https://github.com/mono/libgdiplus/commits/master/src/pngcodec.c .
>>>> Shouldn't be too hard to figure out which one broke your scenario.
>>>>
>>>> -- Alex
>>>>
>>>> > To: knocte at gmail.com
>>>> > Date: Tue, 9 Jun 2015 12:31:43 +0200
>>>> > From: benjamin at anderdonau.de
>>>> > CC: mono-devel-list at lists.ximian.com
>>>> > Subject: Re: [Mono-dev] Problem with PNG transparancy on current
>>>> Debian Unstable
>>>> >
>>>> > Alright, I compiled libgdiplus 2.10 and put it into
>>>> /opt/libgdiplus2.10/
>>>> > I then did the following:
>>>> > LD_LIBRARY_PATH=/opt/libgdiplus2.10/lib/
>>>> > export LD_LIBRARY_PATH
>>>> > ./transparancy.exe
>>>> >
>>>> > And it works fine. So I guess there is a regression somewhere in
>>>> > libgdiplus between 2.10 and today.
>>>> >
>>>> >
>>>> > Am 2015-06-09 12:17, schrieb Benjamin Schieder:
>>>> > > I have this version on squeeze:
>>>> > > ii libgdiplus 2.10-3+b1
>>>> > > armel interface library for System.Drawing of Mono
>>>> > >
>>>> > > And this version on unstable:
>>>> > > ii libgdiplus
>>>> > > 3.12-0xamarin1+jpeg62.1 amd64 interface library
>>>> > > for System.Drawing of Mono
>>>> > >
>>>> > > I'll try to compile a 2.10 version of libgdiplus, but that's a lot
>>>> of
>>>> > > difference and probably way above my head to bisect correctly.
>>>> > >
>>>> > > Am 2015-06-09 11:50, schrieb Andres G. Aragoneses:
>>>> > >> You could check what version of
>>>> > >> libgdiplus(https://github.com/mono/libgdiplus) did Debian Squeeze
>>>> > >> include, and try to run a custom new mono built from sources, with
>>>> an
>>>> > >> older libgdiplus, to confirm that it is a libgdiplus regression.
>>>> If it
>>>> > >> is, then after that you could try to bisect the commit that
>>>> caused it.
>>>> > >>
>>>> > >> On 09/06/15 11:40, Benjamin Schieder wrote:
>>>> > >>> Hello Alex.
>>>> > >>>
>>>> > >>> I have followed those instructions and done a dist-upgrade, but
>>>> after
>>>> > >>> re-compiling with mcs the problem persists unchanged. I have the
>>>> > >>> following versions now:
>>>> > >>>
>>>> > >>> [11:38:29][blindcoder at flora:~/Downloads/PZ/MapMap]$ mcs --version
>>>> > >>> Mono C# compiler version 4.0.1.0
>>>> > >>> [11:38:34][blindcoder at flora:~/Downloads/PZ/MapMap]$ mono
>>>> --version
>>>> > >>> Mono JIT compiler version 4.0.1 (tarball Thu May 28 09:08:28 UTC
>>>> > >>> 2015)
>>>> > >>> Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors.
>>>> > >>> www.mono-project.com
>>>> > >>> TLS: __thread
>>>> > >>> SIGSEGV: altstack
>>>> > >>> Notifications: epoll
>>>> > >>> Architecture: amd64
>>>> > >>> Disabled: none
>>>> > >>> Misc: softdebug
>>>> > >>> LLVM: supported, not enabled.
>>>> > >>> GC: sgen
>>>> > >>> [11:38:37][blindcoder at flora:~/Downloads/PZ/MapMap]$ cli --version
>>>> > >>> Mono JIT compiler version 4.0.1 (tarball Thu May 28 09:08:28 UTC
>>>> > >>> 2015)
>>>> > >>> Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors.
>>>> > >>> www.mono-project.com
>>>> > >>> TLS: __thread
>>>> > >>> SIGSEGV: altstack
>>>> > >>> Notifications: epoll
>>>> > >>> Architecture: amd64
>>>> > >>> Disabled: none
>>>> > >>> Misc: softdebug
>>>> > >>> LLVM: supported, not enabled.
>>>> > >>> GC: sgen
>>>> > >>>
>>>> > >>> Kind regards,
>>>> > >>> Benjamin
>>>> > >>>
>>>> > >>> Am 2015-06-09 11:07, schrieb Alexander Köplinger:
>>>> > >>>
>>>> > >>>> It works fine here with latest Mono 4.0.1.44 on Ubuntu. Can you
>>>> try
>>>> > >>>> upgrading to latest Mono from Xamarin by following
>>>> > >>>>
>>>>
>>>> http://www.mono-project.com/docs/getting-started/install/linux/#debian-ubuntu-and-derivatives
>>>>
>>>> > >>>> ?
>>>> > >>>>
>>>> > >>>> I suspect this has something to do with libgdiplus (the native
>>>> > >>>> library
>>>> > >>>> most of the System.Drawing code calls into).
>>>> > >>>>
>>>> > >>>> -- Alex
>>>> > >>>>
>>>> > >>>> > To: mono-devel-list at lists.ximian.com
>>>> > >>>> > Date: Tue, 9 Jun 2015 10:15:02 +0200
>>>> > >>>> > From: benjamin at anderdonau.de
>>>> > >>>> > Subject: [Mono-dev] Problem with PNG transparancy on current
>>>> Debian
>>>> > >>>> Unstable
>>>> > >>>> >
>>>> > >>>> > Hello.
>>>> > >>>> >
>>>> > >>>> > I have a problem with PNG transparancy in mono on current
>>>> Debian
>>>> > >>>> > Unstable.
>>>> > >>>> > I created a small example (4 kB download) with minimal code
>>>> and two
>>>> > >>>> > example images:
>>>> > >>>> > https://oc.anderdonau.de/index.php/s/VwTAlcjETG6j3XP
>>>> > >>>> >
>>>> > >>>> > Running this example on a current Debian Unstable results in
>>>> this - bad
>>>> > >>>> > - image:
>>>> > >>>> > https://oc.anderdonau.de/index.php/s/AtVtba0tpSk4bn8
>>>> > >>>> >
>>>> > >>>> > Running the same code on an old Debian Squeeze (on armel)
>>>> results in
>>>> > >>>> > this - correct - image:
>>>> > >>>> > https://oc.anderdonau.de/index.php/s/eqhmXh9qpBbg0WW
>>>> > >>>> >
>>>> > >>>> > Can someone help me with this issue?
>>>> > >>>> >
>>>> > >>>> >
>>>> > >>>> > Kind regards,
>>>> > >>>> > Benjamin
>>>> > >>>> > --
>>>> > >>>> > Jabber: blindcoder at jabber.ccc.de
>>>> > >>>> > Twitter: https://twitter.com/blind_coder
>>>> > >>>> > Web: http://www.benjamin-schieder.de/
>>>> > >>>> > _______________________________________________
>>>> > >>>> > Mono-devel-list mailing list
>>>> > >>>> > Mono-devel-list at lists.ximian.com
>>>> > >>>> > http://lists.ximian.com/mailman/listinfo/mono-devel-list
>>>> > >>>
>>>> > >>> Jabber: blindcoder at jabber.ccc.de <mailto:blindcoder at jabber.ccc.de
>>>> >
>>>> > >>> Twitter: https://twitter.com/blind_coder
>>>> > >>> Web: http://www.benjamin-schieder.de/
>>>> > >>>
>>>> > >>>
>>>> > >>> _______________________________________________
>>>> > >>> Mono-devel-list mailing list
>>>> > >>> Mono-devel-list at lists.ximian.com
>>>> > >>> http://lists.ximian.com/mailman/listinfo/mono-devel-list
>>>> > >>>
>>>> > >>
>>>> > >>
>>>> > >> _______________________________________________
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>>>> > >> http://lists.ximian.com/mailman/listinfo/mono-devel-list
>>>> >
>>>> > --
>>>> > Jabber: blindcoder at jabber.ccc.de
>>>> > Twitter: https://twitter.com/blind_coder
>>>> > Web: http://www.benjamin-schieder.de/
>>>> > _______________________________________________
>>>> > Mono-devel-list mailing list
>>>> > Mono-devel-list at lists.ximian.com
>>>> > http://lists.ximian.com/mailman/listinfo/mono-devel-list
>>>>
>>>
>>> Jabber: blindcoder at jabber.ccc.de <mailto:blindcoder at jabber.ccc.de>
>>> Twitter: https://twitter.com/blind_coder
>>> Web: http://www.benjamin-schieder.de/
>>>
>>>
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>>>
>>>
>>
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>
> --
> Jabber: blindcoder at jabber.ccc.de
> Twitter: https://twitter.com/blind_coder
> Web: http://www.benjamin-schieder.de/
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