Thumbnails: add HiDpi folders

[Méven]

>
> Date: Mon, 1 Jun 2020 10:23:16 -0600
> From: Nate Graham <nate at kde.org>
> To: xdg at lists.freedesktop.org
> Subject: Re: Thumbnails: add HiDpi folders
> Message-ID: <7a961085-09bc-2079-6918-2acd70e21ec5 at kde.org>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> I like the idea. How would fractional scaling be handled though? If I'm
> using a 1.25x scale (as I am right now), would it generate an @2x
> thumbnail, store that, and scale it down for display? Or would it
> generate an @1.25x scale thumbnail?
>

Scale would be rounded up , that means 1.25 => 2, 3.25 => 4.
Under X, the application will have to down scale while painting the
thumbnails.
Under Wayland, with fractional scaling, application paint at the scale ceil
up,(1.25=> 2) and the fact that the scale factor is not an integer is non
of their concern, the compositor downscales on the GPU the application then.

-- 
Méven
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