Re: Embedding icons in Pango text, the "right" way?

2016-08-12 Thread Behdad Esfahbod 
See:
https://github.com/GNOME/pango/blob/master/examples/cairoshape.c

On Aug 11, 2016 8:04 AM, "Andy Meneely"  wrote:

> Hi,
>   I maintain a Ruby gem that uses Pango heavily (
> https://github.com/andymeneely/squib/). One of the key features is to be
> able to draw an icon into the text such that it flows just like any other
> word. Carving out the space in the Pango layout has proven to be a
> finicky challenge. (Once we carve out the proper space in the layout, we
> use Cairo to paint the image separately.)
>
> What is the proper way to carve out space for image? We need this space to
> flow like any other word.
>
> The way we currently carve out space is a bit hacky (
> https://github.com/andymeneely/squib/blob/master/lib/squib/
> graphics/text.rb#L98). We (1) replace the key with a control character,
> then (2) change the letter spacing of the middle character to the width we
> need. This fails on some platforms and not others.
>
> If we created a zero-sized regular character (e.g "a"), then stroking path
> will fail because a zero-sized font invalidates the matrix math. Plus, we
> get strange behavior happening when the text is ONLY an embedded icon of a
> zero-sized font (i.e. we get a warning that the font can't be found).
>
> So I've never been happy with the way we implement this and I'm convinced
> Pango provides a better way. I see the AttrShape struct - should I be
> using that? How do I set attributes for just one character? I've been
> scouring the docs and mailing lists archives and I'm not grasping exactly
> how attribute lists work, so that's why I went with markup.
>
> If you have solutions in just C, or in another scripting language, I can
> port it.
>
> Thanks!
>
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Re: Embedding icons in Pango text, the "right" way?

2016-08-12 Thread Andy Meneely 
On Fri, Aug 12, 2016 at 5:26 AM, Stefan Salewski  wrote:

> On Thu, 2016-08-11 at 11:04 -0400, Andy Meneely wrote:
> > One of the key features is to be able to draw an icon
> > into the text
>
> You do know that GTK3 textview is doing exactly that?
>
> See GTK3 gtk3-demo program, textview, "Multiple Views". No idea how
> that works internally, sorry.
>

Ah, I was not aware of those. I don't use gtk in my project, so I didn't
think to look there. I haven't found gtk's exact implementation, but that
information led me to figure out how to create a Shape attribute and add it
to the to the AttrList and hook in a "shape renderer" with a
Pango::Rectangle.

I'll post a minimal solution here for posterity once I get the details
ironed out.

Thanks!
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Re: Embedding icons in Pango text, the "right" way?

2016-08-12 Thread Stefan Salewski 
On Thu, 2016-08-11 at 11:04 -0400, Andy Meneely wrote:
> One of the key features is to be able to draw an icon
> into the text

You do know that GTK3 textview is doing exactly that?

See GTK3 gtk3-demo program, textview, "Multiple Views". No idea how
that works internally, sorry.
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