Re: Missing items to make Cairo ready

[Luca Fascione]

What if you use GS to do PS to PDF instead and embed that? Would Cairo let
you?
(For the PDF backend I mean)

Also, how does ImageMagick implement PS to PNG conversion? I wonder if
their approach might inspire us, or whether having an optional dependency
would be an idea to consider (if you have imagemagick and/or use some
option to Lily you get one behaviour vs the other).

L


On Sun, 1 Jan 2023, 12:36 Jean Abou Samra, <jean@abou-samra.fr> wrote:

> Le 30/12/2022 à 13:08, Jean Abou Samra a écrit :
> > which means figuring out how to do PNGs via the default PS
> > backend and GS.
>
>
> I looked a bit at this.
>
> It's not insurmountable, *but*, alpha transparency is not going
> to work. PNG images with an alpha channel will need to be
> converted to plain RGB because PostScript doesn't support
> alpha transparency, and while GhostScript does have a little
> support for it, it seems the only way to have an image with
> variable levels of transparency across the image is to draw
> each of the pixels separately.
>
> Does that sound acceptable?
>
> (For completeness: PNG images in the default SVG backend should be
> easy.)
>