Re: What is the proper way to scale fringe-bitmaps for high-DPI displays?

[Clément Pit-Claudel]

On 2019-03-20 16:17, Eli Zaretskii wrote:
>> Cc: address@hidden
>> From: Clément Pit-Claudel <address@hidden>
>> Date: Wed, 20 Mar 2019 16:05:48 -0400
>>
>>> The frame's parameters is a better way if we think such a parameter
>>> will be useful to Lisp programs, and calling a function for that is
>>> too much overhead.  Otherwise, a simple field of 'struct frame' will
>>> be somewhat less hassle, because you don't need to mess with the likes
>>> of frame-parameter to teach them about this new parameter.  But either
>>> way, the job is not hard.
>>
>> Oh, so Emacs' C code would scale the bitmaps? I expected the Lisp code would 
>> do that.
> 
> Fringes are displayed in C.  Doing this in Lisp will produce
> flickering, I'm afraid.

I thought the C code would read the scaling factor and set the bitmap 
accordingly just once, when creating overlays or applying text properties.