Re: High-res Customize icons

[Yuan Fu]

> On Apr 22, 2020, at 3:28 PM, Eli Zaretskii <address@hidden> wrote:
> 
>> From: Yuan Fu <address@hidden>
>> Date: Wed, 22 Apr 2020 15:19:16 -0400
>> Cc: chad <address@hidden>,
>> Clément Pit-Claudel <address@hidden>,
>> address@hidden
>> 
>>>> I wonder if it’s even worthwhile having a bitmap for this. These days, it 
>>>> could as well be any of ▶/▼,
>>>> ▷/▽, ▸/▾, or ▹/▿. It would even work on some text terminals.
>>> 
>>> Bad idea, IMO.
>> 
>> Why a bad idea? I’m curious to know.
> 
> Because you basically cannot trust different fonts to look the same,
> or even similar enough, and because some fonts will not have the glyph
> for those characters, which means complications.  It's tempting to use
> a special character, because it's easy, but it's a false hope, it only
> makes things more complicated.
> 
>> From what I can see, unicode glyphs looks pretty good and comes for free, 
>> and as Yuri said they could even work on text terminals. At least for the 
>> simple shapes like ▶/▼, they seems to be a good option.
> 
> We cannot base fundamental features of the Emacs UI on techniques that
> _might_ work.  We need techniques that _always_ work.

I agree.

Here is a patch for the high-res icons. Put both icon files under 
/etc/images/custom.

In the patch I modified widget-image-find to look for @2x images. Can we even 
modify find-image so it looks for @2x images (as an opt-in feature)? That way 
Other applications (Magit, gdb-mi, etc) that uses images icons in buffer and 
fringe could have high-res icons without changing a line of code (assuming they 
use find-image).

low-res

high-res

Yuan

high-res.patch
Description: Binary data

righ@2x.xpm
Description: Binary data

down@2x.xpm
Description: Binary data