Your message dated Sun, 19 Nov 2017 18:45:33 +0100 with message-id <cae6_+ufgft6b1qyd3vgmsbb4z9ogf8h6xvrn4ehkkhp_xok...@mail.gmail.com> and subject line Re: python-cairo: ImageSurface.write_to_png() transparency fails has caused the Debian Bug report #661005, regarding python-cairo: ImageSurface.write_to_png() transparency fails to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact [email protected] immediately.) -- 661005: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=661005 Debian Bug Tracking System Contact [email protected] with problems
--- Begin Message ---Package: python-cairo Version: 1.8.8-1+b2 Severity: normal Dear Maintainer, It seems writing a png when a surface is fully opaque causes the alpha channel to be supressed in subsequent writes. #!/usr/bin/python import cairo surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 100, 100) ctx = cairo.Context(surface) ctx.set_operator(cairo.OPERATOR_SOURCE) ctx.set_source_rgba(1,1,1,1) # fully opaque ctx.paint() surface.write_to_png("i1.png") # i1.png is an opaque white square. ctx.set_source_rgba(1,1,1,0) ctx.paint() surface.write_to_png("i2.png") # i2.png is an opaque black square (fail). surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 100, 100) ctx = cairo.Context(surface) ctx.set_operator(cairo.OPERATOR_SOURCE) ctx.set_source_rgba(1,1,1,1) ctx.paint() # no write_to_png at this point ctx.set_source_rgba(1,1,1,0) ctx.paint() surface.write_to_png("i3.png") # i3.png is a transparent square surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 100, 100) ctx = cairo.Context(surface) ctx.set_operator(cairo.OPERATOR_SOURCE) ctx.set_source_rgba(1,1,1,0.9) # some transparency ctx.paint() surface.write_to_png("i4.png") # i4.png is a nearly opaque white square. ctx.set_source_rgba(1,1,1,0) ctx.paint() surface.write_to_png("i5.png") # i5.png is a transparent square Cheers John -- System Information: Debian Release: wheezy/sid APT prefers unstable APT policy: (500, 'unstable') Architecture: amd64 (x86_64) Kernel: Linux 3.1.0-1-amd64 (SMP w/2 CPU cores) Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages python-cairo depends on: ii libc6 2.13-26 ii libcairo2 1.10.2-6.2 ii python 2.7.2-9 ii python-support 1.0.14 python-cairo recommends no packages. python-cairo suggests no packages. -- no debconf information
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--- Begin Message ---I can reproduce the issue (i2.png being black) on wheezy but no longer in current sid (i2.png is transparent). I assume this was fixed in cairo in the meantime.
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