Hello,

It'd be nice if we had support for the X Window Dump file format in libvips to allow taking screenshots via the xwd(1) utility that comes with the X11 distribution by default.

Example command with xwd(1) and convert(1) from ImageMagick to take a PNG screenshot:
$ xwd -root | convert xwd:- test.png

Possible usage examples and actual outputs:
$ xwd -root | vips stdin test.png
VipsImage: unable to load source
$ xwd -root -out test.xwd && vips copy test.xwd test.png
VipsForeignLoad: "test.xwd" is not a known file format

Counter arguments:

• Keep around an ImageMagick installation for taking screenshots: duplicates efforts
• Use a full-featered screenshot-taking utility like scrot: more packages to manage

Thank you.