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

[Benjamin Schieder]

Hello Rafael. 

I have already established that it is most certainly a regression in
libgdiplus. Using an older version (2.10) with the current mono runtime
by overriding LD_LIBRARY_PATH to the 2.10 libgdiplus binary brings a
correct result. 

Kind regards,
Benjamin 

Am 2015-06-09 12:42, schrieb Rafael Teixeira: 

> AFAIR libgdiplus delegates to libpng reading the bitmap, probably libpng is returning something different from the usual on Debian unstable for your image. Did you try with other images, or with a trunk/older version of libpng? 
> 
> On Tue, Jun 9, 2015, 06:40 Benjamin Schieder <benjamin at anderdonau.de> 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 [1]
> 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 [1]
> 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 [2] ?
> 
> 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 [3]
>> 
>> Running this example on a current Debian Unstable results in this - bad 
>> - image:
>> https://oc.anderdonau.de/index.php/s/AtVtba0tpSk4bn8 [4]
>> 
>> Running the same code on an old Debian Squeeze (on armel) results in 
>> this - correct - image:
>> https://oc.anderdonau.de/index.php/s/eqhmXh9qpBbg0WW [5]
>> 
>> Can someone help me with this issue?
>> 
>> 
>> Kind regards,
>> Benjamin
>> -- 
>> Jabber: blindcoder at jabber.ccc.de
>> Twitter: https://twitter.com/blind_coder [6]
>> Web: http://www.benjamin-schieder.de/ [7]
>> _______________________________________________
>> Mono-devel-list mailing list
>> Mono-devel-list at lists.ximian.com
>> http://lists.ximian.com/mailman/listinfo/mono-devel-list [8] 
> 
> Jabber: blindcoder at jabber.ccc.de
> Twitter: https://twitter.com/blind_coder [6]
> Web: http://www.benjamin-schieder.de/ [7] _______________________________________________
> Mono-devel-list mailing list
> Mono-devel-list at lists.ximian.com
> http://lists.ximian.com/mailman/listinfo/mono-devel-list [8]

Jabber: blindcoder at jabber.ccc.de
 Twitter: https://twitter.com/blind_coder [6]
 Web: http://www.benjamin-schieder.de/ [7] 

Links:
------
[1] http://www.mono-project.com
[2]
http://www.mono-project.com/docs/getting-started/install/linux/#debian-ubuntu-and-derivatives
[3] https://oc.anderdonau.de/index.php/s/VwTAlcjETG6j3XP
[4] https://oc.anderdonau.de/index.php/s/AtVtba0tpSk4bn8
[5] https://oc.anderdonau.de/index.php/s/eqhmXh9qpBbg0WW
[6] https://twitter.com/blind_coder
[7] http://www.benjamin-schieder.de/
[8] http://lists.ximian.com/mailman/listinfo/mono-devel-list
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