Using overlays to hide emojis while preserving fill

Using overlays to hide emojis while preserving fill

[Psionic K]

The animations in dslide occasionally reveal one character at a time.
My initial implementation just sets the foreground to the background
color.  This doesn't work for emojis.  I suppose I can use the display
property, but I need to preserve the fill size in that case.  What's a
consistent way to obscure the text while preserving its dimensions?

Re: Using overlays to hide emojis while preserving fill

[Eli Zaretskii]

> From: Psionic K <psionik@positron.solutions>
> Date: Sat, 22 Jun 2024 11:21:39 +0900
> 
> The animations in dslide occasionally reveal one character at a time.
> My initial implementation just sets the foreground to the background
> color.  This doesn't work for emojis.  I suppose I can use the display
> property, but I need to preserve the fill size in that case.  What's a
> consistent way to obscure the text while preserving its dimensions?

If you are asking how to compute the width of text (including text
that shows Emoji), then I'd expect string-pixel-width to be (at least
part of) the answer.