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Re: Missing items to make Cairo ready

From: Paolo Prete
Subject: Re: Missing items to make Cairo ready
Date: Sat, 31 Dec 2022 01:13:30 +0100

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.

On Sat, Dec 31, 2022 at 12:41 AM Jean Abou Samra <> wrote:

> Le 31/12/2022 à 00:29, Paolo Prete a écrit :
> > Hi Jean,
> >
> > Do you have a test snippet for cairo_svg_create_for_stream() ?
> >
> > I would like to make some tests and I googled a bit but could not find
> > anything useful for it.
> Fortunately, my deleted branch for this was still around in my Git
> repository. I ressuscitated it and uploaded it to my fork, so you should
> be able to check it out with
> git fetch "" cairo-output-attributes
> git checkout -b cairo-output-attributes FETCH_HEAD
> You can see that the <g> tags are properly output, but before all the
> rest of the SVG output.

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