Re: Mechanism to scale SVG images when default face height changes?

[Jimmy Yuen Ho Wong <wyuenho@gmail.com>]

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Ah, I was looking at
https://www.gnu.org/software/emacs/manual/html_node/elisp/Pixel-Specification.html,
this isn't documented but indeed it scales.

```elisp
#("" 0 1
  (face all-the-icons-lpurple font-lock-face all-the-icons-lpurple
fontified t display
        (image :type svg :data "<svg viewBox=\"0 0 512 512\" width=\"512\"
height=\"512\"> <path d=\"...snip...\"></path></svg>" :scale 1
:transform-smoothing t :width (1 . em) :ascent center :margin 1)
        front-sticky nil rear-nonsticky t))
```

But this doesn't seem to work, I suppose px is not a unit?

```elisp
#("" 0 1
  (face all-the-icons-lpurple font-lock-face all-the-icons-lpurple
fontified t display
        (image :type svg :data "<svg viewBox=\"0 0 512 512\" width=\"512\"
height=\"512\"> <path d=\"...snip...\"></path></svg>" :scale 1
:transform-smoothing t :width (- (1 . em) (1 . px)) :ascent center :margin
1)
        front-sticky nil rear-nonsticky t))
```

I like this approach a lot, but I do need pixel precision calculated on
demand because I need to add a 1px margin between icons. If I don't
subtract 2 px back from the dimensions, the icons will be wider than a
character.

Jimmy


On Mon, Sep 18, 2023 at 7:19 PM Alan Third <alan@idiocy.org> wrote:

> On Mon, Sep 18, 2023 at 06:42:33PM +0100, Jimmy Yuen Ho Wong wrote:
> > In the SVG branch in all-the-icons, all the icons are inserted with a
> > `:width` and `:height` properties set on the image, and the face is
> applied
> > to the propertized string. i.e.
> >
> > ```elisp
> > ELISP> (all-the-icons-icon-for-file "test.js")
> > #("" 0 1
> >   (face all-the-icons-lpurple font-lock-face all-the-icons-lpurple
> > fontified t display
> >         (image :type svg :data "<svg viewBox=\"0 0 512 512\"
> width=\"512\"
> > height=\"512\"> <path d=\"...snip...\"></path></svg>" :scale 1
> > :transform-smoothing t :width 14 :height 14 :ascent center :margin 1)
> >         front-sticky nil rear-nonsticky t))
> > ```
>
> Do you need to set the size in pixels? If you set the size in em's
> (from Emacs 28 up) then it will scale automatically.
>
> --
> Alan Third
>

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