Re: Missing items to make Cairo ready

[Paolo Prete]

Yeah, I also thought about overlying multiple surfaces.
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

On Sat, Dec 31, 2022 at 1:23 AM Jean Abou Samra <jean@abou-samra.fr> wrote:

> Le 31/12/2022 à 01:13, Paolo Prete a écrit :
> > I'll examine it, thanks.
> > Meanwhile, I don't know if it is the right case, but it comes to my
> > mind a hack, which I applied on some similar code:
> >
> > Before the SVG bytestream is emitted by the write_func, I would set a
> > temporary, special and different _color_ for each grob that is
> > associated with output-attributes.
> > This color is automatically generated and must obviously be different
> > from any other color that will be included in the output SVG.
> > Then you can create a map with key = specialcolor, value = pair
> > (original color,  output-attributes) and when you parse the generated
> > bytestream, if you find any set of objects with a color included in
> > the map, you can group them, set output attributes on the group and
> > restore the original color.
> >
> > I repeat: this is a hack, it's a bit imaginative and I don't know if
> > it's really suitable for the present case. But the unique color
> > mechanism is much safer than you might think.
>
>
> Wait, I'm starting to wonder if it's possible via a second surface.
>
> I'll try this, but not guarantees.
>
>