Re: Support text-shadow on for Emacs face

[Dmitry Gutov]

On 22.05.2020 16:19, Eli Zaretskii wrote:
> > Cc: address@hidden, address@hidden
> > From: Dmitry Gutov <address@hidden>
> > Date: Fri, 22 May 2020 16:06:26 +0300
> >
> > On 22.05.2020 15:58, Eli Zaretskii wrote:
> > > > And here's the design document, I guess:
> > > > https://github.com/ksqsf/emacsmoe/wiki/Text-Shadow
> > > I only see macOS-specific changes there.
> >
> > You mean the implementation section? Indeed. The original message in
> > this thread said as much.
>
> But the text there says there should be changes in xfaces.c etc.  I
> wonder how can I see those changes.

They're inside the PR, already linked to in the original message.

Here, at the bottom: https://github.com/ksqsf/emacsmoe/pull/1/files

Whether you should read it, I don't know, considering there's no 
copyright assignment, and someone might have to re-implement the code. 
But the changes are not particularly long or surprising.

> > "cairo text shadow" gives some results on web search, though. This one
> > looks the most credible:
> > https://lists.cairographics.org/archives/cairo/2010-September/020915.html
> >
> > It's old, though, and the links inside seem to have died. Want me to
> > hunt them down?
>   
> Given the description, I'm not sure it's worth our while,

Perhaps you meant "patches welcome"?

> but if you
> can find the patches without investing too much time, it will be
> appreciated.  Thanks.

There is no ready patch for Emacs for this part.

One is "how Firefox implements text-shadow". Apparently, this is how 
it's done these days: 
https://searchfox.org/mozilla-central/source/gfx/thebes/gfxBlur.cpp

And the second example lives here now: 
https://github.com/syndicodefront/infekt/blob/master/src/lib/cairo_box_blur.cpp