Re: Missing items to make Cairo ready

[Jean Abou Samra]

Le 01/01/2023 à 00:40, Paolo Prete a écrit :
> On Sat, Dec 31, 2022 at 1:39 AM Jean Abou Samra <jean@abou-samra.fr> 
> wrote:
>
>     Le 31/12/2022 à 01:29, Paolo Prete a écrit :
>     > Yeah, I also thought about overlying multiple surfaces.
>
>     Nope, no dice.
>
>     > But don't exclude my tip: after all, the colors can give you unique
>     > identifiers for the map I've described to you, and this makes the
>     > mechanism safe
>
>
>     Well, it's pretty hacky.
>
>
> I know but I would not underestimate it. I found the following merge 
> request, where I see your participation:
>
> https://gitlab.freedesktop.org/cairo/cairo/-/merge_requests/254
>
> In theory, adding <g> groups with output-attributes should have a 
> similar, if not identical implementation.


I think it should be simpler because it does not need to get the extents 
of the inner content, unlike hyperlinks.


> What I fear is that manipulating the SVG tree is beyond the scope of 
> the library, which is meant for _rendering_; but at the same time I 
> think that producing a SVG file is in itself more than "rendering" 
> (then, these features could be accepted).


Uli Schlachter is a Cairo maintainer, and her/his (?) reaction on the MR 
was merely commenting on the code, but not making objections on the 
principle.

A few years ago, the PDF backend gained lots of non-graphical features 
(which LilyPond is now making use of: metadata, soon outlines, etc.)

https://gitlab.freedesktop.org/cairo/cairo/-/issues/281 has been open 
for 12 years and nobody turned it down.

I think it is in the scope of the library. It just needs an implementation.


> Therefore, I think that the best thing is to ping the cairo staff and 
> ask if both these features have chances to be accepted, considering 
> the enormous advantage they have for LilyPond and other applications 
> as well.


As you wish. I predict they will respond "sure, but are you going to 
submit the code"?

OpenPGP_signature
Description: OpenPGP digital signature