Inconsistent icon sizes on hidpi screens

[calliecameron]

Hi,

Using Emacs 24.5.1 on Linux Mint 18 with HiDPI scaling turned on, some icons are very small:

The text mode and autorevert icons are normal sized, but the python and terminal icons are small. I think this might have something to do with using icons from fonts vs. XPMs; I have FontAwesome, mfizz and IcoMoon installed on my system.

[mattfidler]

Yes. This is because of the difference between pixel icons vs fonts.

Is your emacs compiled with Imagemagick support? In theory, emacs should resize the images if you do...

[mattfidler]

Same size icons could also be supported if:

• emacs has svg support
• emacs allows resizing of svgs
• mode-icons supports svgs.

Or,

• mode-icons supports svg files by rescaling them in GIMP...

[calliecameron]

Is your emacs compiled with Imagemagick support?

I think so - at least, imagemagick-types exists and returns a big list of file types. Are there any particular variables I would need to set to make image resizing work? My emacs can also open svgs, but I'm not sure if that's a default feature or something I had to enable at compile time.

[mattfidler]

It seems it is supported on your system. Perhaps you can add some amount to the height to have the images resized appropriately...? I have added an option mode-icons-line-height-adjust to allow manual adjustment...

[calliecameron]

Finally had a chance to try this, but it doesn't seem to be working. The small icons are still the same size no matter what I set mode-icons-line-height-adjust to.

In case it was a conflict with something else in my configuration, I tried it with a blank .emacs, just installed the package and then did:

(setq mode-icons-line-height-adjust 20) ; or any other number
(mode-icons-mode)

Is that right?

[mattfidler]

In theory it should work, but obviously it doesn't. I'm not sure why. It may work in a standard buffer, but not in the mode line.

[To1ne]

Having decent support for HiDPI would be a really big plus.

How about creating @2x versions of the icons?