Re: "Fix" sag scaling for hidpi

[Dmitry Gutov]

On 14.02.2021 01:14, Alan Third wrote:
> On Sun, Feb 14, 2021 at 12:50:26AM +0200, Dmitry Gutov wrote:
> > I noticed the pgtk and the GTK3 builds render them in different size at 2x
> > scaling. Basically, pgtk scales (and renders them kind of fuzzily) and GTK3
> > does not. I wonder if their rendering could be standardized as well, and
> > whether the same approach could be used to avoid fuzziness.
>
> Really I think we should be providing hi-res, or vector, versions of
> the fringe bitmaps for hi-dpi screens.
>
> I'm not sure if we can just swap in SVG files for the fringe bitmaps
> on systems that support them... Fringe bitmaps are special in some
> way.

But couldn't we use a non-fuzzy algorithm to scale them, at least as a 
fallback? If the bitmap is all 1s an 0s, scaling by 2x could just double 
the lattice instead of doing the linear scaling.

Or there might be other scaling algorithms as well, if people feel that 
that approach ends up looking too "blocky".

There are an infinite number of possible scaling factors, so providing a 
high-res version for all of them is probably out, but some vector format 
sounds like an interesting possibility. As long as it's feasible to 
generate programmatically, because that's what I'm doing with a bunch of 
fringe bitmaps in a certain popular minor mode.