I have found the bad commit (and learned how to use git bisect in the process):
[01:04:04][blindcoder@flora:~/Downloads/libgdiplus]$ git bisect bad 59ca17e56adb8555e9b4e0960b771f2849f6366f is the first bad commit commit 59ca17e56adb8555e9b4e0960b771f2849f6366f Author: Dick Porter <d...@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 [1] . > Shouldn't be too hard to figure out which one broke your scenario. > > -- Alex > >> To: kno...@gmail.com >> Date: Tue, 9 Jun 2015 12:31:43 +0200 >> From: benja...@anderdonau.de >> CC: mono-devel-list@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@flora:~/Downloads/PZ/MapMap]$ mcs --version >>>>> Mono C# compiler version 4.0.1.0 >>>>> [11:38:34][blindcoder@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@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@lists.ximian.com >>>>>> > Date: Tue, 9 Jun 2015 10:15:02 +0200 >>>>>> > From: benja...@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: blindco...@jabber.ccc.de >>>>>> > Twitter: https://twitter.com/blind_coder >>>>>> > Web: http://www.benjamin-schieder.de/ >>>>>> > _______________________________________________ >>>>>> > Mono-devel-list mailing list >>>>>> > Mono-devel-list@lists.ximian.com >>>>>> > http://lists.ximian.com/mailman/listinfo/mono-devel-list >>>>> >>>>> Jabber: blindco...@jabber.ccc.de <mailto:blindco...@jabber.ccc.de> >>>>> Twitter: https://twitter.com/blind_coder >>>>> Web: http://www.benjamin-schieder.de/ >>>>> >>>>> >>>>> _______________________________________________ >>>>> Mono-devel-list mailing list >>>>> Mono-devel-list@lists.ximian.com >>>>> http://lists.ximian.com/mailman/listinfo/mono-devel-list >>>>> >>>> >>>> >>>> _______________________________________________ >>>> Mono-devel-list mailing list >>>> Mono-devel-list@lists.ximian.com >>>> http://lists.ximian.com/mailman/listinfo/mono-devel-list >> >> -- >> Jabber: blindco...@jabber.ccc.de >> Twitter: https://twitter.com/blind_coder >> Web: http://www.benjamin-schieder.de/ >> _______________________________________________ >> Mono-devel-list mailing list >> Mono-devel-list@lists.ximian.com >> http://lists.ximian.com/mailman/listinfo/mono-devel-list Jabber: blindco...@jabber.ccc.de Twitter: https://twitter.com/blind_coder [2] Web: http://www.benjamin-schieder.de/ [3] Links: ------ [1] https://github.com/mono/libgdiplus/commits/master/src/pngcodec.c [2] https://twitter.com/blind_coder [3] http://www.benjamin-schieder.de/
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