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Re: Accessing rendered image data
From: |
Lars Magne Ingebrigtsen |
Subject: |
Re: Accessing rendered image data |
Date: |
Tue, 28 Jun 2016 20:29:58 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux) |
Eli Zaretskii <address@hidden> writes:
> And you should trust me that I don't like wasting my time on digging
> into problems whose purpose I don't fully understand ;-)
As I said earlier in this thread, I wanted to figure out how much space
text rendered in an SVG takes. Since Emacs doesn't expose this data
back to Elisp land, I hit upon the idea of rendering the text in a
buffer instead (with the same fonts that would have been used in the
SVG).
This will give me approximate sizes that'll be good enough.
> How should I know? This stuff is not documented at all, so you are
> asking me to step in a debugger through gobs of unfamiliar and
> complicated code, without ever understanding what is it that I'm
> trying to accomplish. That's not in my job description.
>
> If you want my help, try telling more.
It is documented in
(info "(lisp)Low-Level Font")
In particular:
-- Function: font-spec &rest arguments
Return a new font spec using the specifications in ARGUMENTS,
which should come in `property'-`value' pairs. The possible
specifications are as follows:
`:name'
The font name (a string), in either XLFD, Fontconfig, or GTK
format. *Note Fonts: (emacs)Fonts.
[...]
`:size'
The font size--either a non-negative integer that specifies
the pixel size, or a floating-point number that specifies the
point size.
An XLFD would look like "futura:size=40".
(insert (propertize "FOO" 'face (list :font (find-font (font-spec :name
"futura:size=40")))))
Does not work. Either this is a bug, or there are missing bits in the
manual that says what find-font and/or 'face wants here. Or there's
something else I'm missing.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
- Accessing rendered image data, Lars Magne Ingebrigtsen, 2016/06/28
- Re: Accessing rendered image data, Lars Magne Ingebrigtsen, 2016/06/28
- Re: Accessing rendered image data, Eli Zaretskii, 2016/06/28
- Re: Accessing rendered image data, Eli Zaretskii, 2016/06/28
- Re: Accessing rendered image data, Lars Magne Ingebrigtsen, 2016/06/28
- Re: Accessing rendered image data, Eli Zaretskii, 2016/06/28
- Re: Accessing rendered image data, Lars Magne Ingebrigtsen, 2016/06/28
- Re: Accessing rendered image data, Eli Zaretskii, 2016/06/28
- Re: Accessing rendered image data,
Lars Magne Ingebrigtsen <=
- Re: Accessing rendered image data, Eli Zaretskii, 2016/06/28
- Re: Accessing rendered image data, Lars Magne Ingebrigtsen, 2016/06/28
- Re: Accessing rendered image data, Lars Magne Ingebrigtsen, 2016/06/28
- Re: Accessing rendered image data, Lars Magne Ingebrigtsen, 2016/06/28
- Re: Accessing rendered image data, Lars Magne Ingebrigtsen, 2016/06/28
- Re: Accessing rendered image data, Robert Weiner, 2016/06/28
- Re: Accessing rendered image data, Eli Zaretskii, 2016/06/30
- Re: Accessing rendered image data, Ted Zlatanov, 2016/06/30
- Re: Accessing rendered image data, Lars Magne Ingebrigtsen, 2016/06/30
- Re: Accessing rendered image data, Ted Zlatanov, 2016/06/30