Created attachment 1820649 [details] image showing the problem Description of problem: Hello Fedora Team, I have a recently updated Fedora 34 installation. The problem I want to report is that it looks like the pango-view tool is always turning antialiasing on when one uses the FreeType backend --backend=ft2, even when one explicitly switches antialiasing off with --antialias=none, whereas it works for the --backend=cairo option. A second question would be if the FreeType backend generally doesn't/can't support --antialias=none? I tried to find some examples in C with antialising turned off but I wasn't successful. I must confess I didn't check other distributions. As pango-view is regarded as a tool for creating minimal reproducers against the font rendering stack, I dare to set the severity to 'high' :-) Best Regards Andre Version-Release number of selected component (if applicable): $ uname -a Linux localhost.localdomain 5.13.13-200.fc34.x86_64 #1 SMP Thu Aug 26 17:06:39 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux $ dnf list installed | grep dejavu dejavu-lgc-sans-fonts.noarch 2.37-16.fc34 @fedora dejavu-lgc-sans-mono-fonts.noarch 2.37-16.fc34 @fedora dejavu-lgc-serif-fonts.noarch 2.37-16.fc34 @fedora dejavu-sans-fonts.noarch 2.37-16.fc34 @fedora dejavu-sans-mono-fonts.noarch 2.37-16.fc34 @fedora dejavu-serif-fonts.noarch 2.37-16.fc34 @fedora $ dnf list installed | grep ImageMagick ImageMagick.x86_64 1:6.9.11.27-3.fc34 @fedora ImageMagick-libs.x86_64 1:6.9.11.27-3.fc34 @fedora $ dnf list installed | grep pango pango.i686 1.48.9-2.fc34 @updates pango.x86_64 1.48.9-2.fc34 @updates pango-devel.x86_64 1.48.9-2.fc34 @updates pangomm.x86_64 2.46.1-1.fc34 @updates $ dnf list installed | grep freetype freetype.i686 2.10.4-3.fc34 @fedora freetype.x86_64 2.10.4-3.fc34 @fedora freetype-devel.x86_64 2.10.4-3.fc34 @fedora $ dnf list installed | grep fontconfig fontconfig.i686 2.13.94-2.fc34 @updates fontconfig.x86_64 2.13.94-2.fc34 @updates fontconfig-devel.x86_64 2.13.94-2.fc34 @updates $ dnf list installed | grep cairo cairo.i686 1.17.4-3.fc34 @fedora cairo.x86_64 1.17.4-3.fc34 @fedora cairo-devel.x86_64 1.17.4-3.fc34 @fedora cairo-gobject.i686 1.17.4-3.fc34 @fedora cairo-gobject.x86_64 1.17.4-3.fc34 @fedora cairomm.x86_64 1.14.2-8.fc34 @fedora python2-cairo.x86_64 1.18.2-8.fc34 @fedora python3-cairo.x86_64 1.20.0-2.fc34 @fedora How reproducible: Always Steps to Reproduce: $ pango-view --no-display --dpi=72 --backend=cairo --antialias=none --font="DejaVu Sans 38" --text="ABCDEFGHIJKLMNOPQRSTUVWXYZ" --output=abc-cairo-aa-none.png $ pango-view --no-display --dpi=72 --backend=cairo --antialias=gray --font="DejaVu Sans 38" --text="ABCDEFGHIJKLMNOPQRSTUVWXYZ" --output=abc-cairo-aa-gray.png $ pango-view --no-display --dpi=72 --backend=cairo --antialias=subpixel --font="DejaVu Sans 38" --text="ABCDEFGHIJKLMNOPQRSTUVWXYZ" --output=abc-cairo-aa-subpixel.png $ pango-view --no-display --dpi=72 --backend=ft2 --antialias=none --font="DejaVu Sans 38" --text="ABCDEFGHIJKLMNOPQRSTUVWXYZ" --output=abc-ft2-aa-none.png $ pango-view --no-display --dpi=72 --backend=ft2 --antialias=gray --font="DejaVu Sans 38" --text="ABCDEFGHIJKLMNOPQRSTUVWXYZ" --output=abc-ft2-aa-gray.png $ pango-view --no-display --dpi=72 --backend=ft2 --antialias=subpixel --font="DejaVu Sans 38" --text="ABCDEFGHIJKLMNOPQRSTUVWXYZ" --output=abc-ft2-aa-subpixel.png $ gimp abc-*.png Actual results: Attached pngs. The file abc-ft2-aa-none.png is in gray-scale and not as expected in black-white. The file abc-cairo-aa-none.png is in black-white as expected. Expected results: I would have expected the files abc*--aa-none.png looking near identical. Additional info:
Created attachment 1820650 [details] image showing how it should look like
I wonder if this patch made it to the new pango 1.49 branch
I think the patch is in pango 1.49.2. Maybe you can try it on Fedora 35 Workstation.
Oh I missed that somehow. perhaps I selected the wrong branch somehow, while exploring the file tree, sorry for that. For the moment I can't test on Fedora 35, because I have still no Fedora 35 available :-( Thank you Peng Wu and kind regards Andre
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I tested in Fedora 36, I think this bug is fixed now.