+antialias is ignored with "pango" format

[joshuakraemer]

ImageMagick version

7.0.11-12

Operating system

Linux

Operating system, version and so on

Void Linux, kernel 5.12.13_1

Description

Disabling antialiasing by +antialias does not work with the "pango" format.

Steps to Reproduce

magick -font Helvetica -density 72 -pointsize 32 +antialias label:'test' -resize 200% /tmp/label.png

magick -font Helvetica -density 72 -pointsize 32 +antialias pango:'test' -resize 200% /tmp/pango.png

Images

No response

[fmw42]

I do not believe this is a bug. It is just a limitation of PANGO. PANGO has limited features that must be called within PANGO. All text features in Imagemagick are not available for PANGO. See https://developer.gnome.org/pygtk/stable/pango-markup-language.html for what is implemented.

[joshuakraemer]

Then please consider it as a feature request. I think only the following would need to be added to https://github.com/ImageMagick/ImageMagick/blob/main/coders/pango.c:

if (draw_info->text_antialias == MagickFalse)
	cairo_font_options_set_antialias(font_options, CAIRO_ANTIALIAS_NONE);

[fmw42]

I will leave further comment to the Imagemagick developers.

[dlemstra]

We just added support for this. This will become available in the next release of ImageMagick 7.

[joshuakraemer]

Thank you, @dlemstra!