Take a screenshot from within Emacs

Take a screenshot from within Emacs

[Clément Pit--Claudel]

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Hey emacs-dev,

How hard would it be to teach Emacs to make screenshots of itself? Not the Gtk menus or additional system-rendered elements — just buffer contents, windows, and frames.  I expect there wouldn't be a general solution; but maybe there is?  If not, how hard would it be to do it in the default configuration on GNU/Linux?

And for bonus points: what about screenshots as SVG?

Clément.


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Re: Take a screenshot from within Emacs

[joakim]

Clément Pit--Claudel <clement.pit@gmail.com> writes:

> Hey emacs-dev,
>
> How hard would it be to teach Emacs to make screenshots of itself? Not
> the Gtk menus or additional system-rendered elements — just buffer
> contents, windows, and frames.  I expect there wouldn't be a general
> solution; but maybe there is?  If not, how hard would it be to do it
> in the default configuration on GNU/Linux?

You could do it by calling a shell utility, but I suppose that wasn't
what you meant.

I don't think Emacs has the capability to access its internal rendering
data out of the box.

Perhaps you could investigate the Cairo branch?


>
> And for bonus points: what about screenshots as SVG?
>
> Clément.
>

-- 
Joakim Verona

Re: Take a screenshot from within Emacs

[Eli Zaretskii]

> From: joakim@verona.se
> Date: Thu, 07 Jul 2016 21:57:41 +0200
> Cc: Emacs developers <emacs-devel@gnu.org>
> 
> I don't think Emacs has the capability to access its internal rendering
> data out of the box.

Actually, it does, sort of.  Take a look at the dump-glyph-matrix
function and the subroutines it calls.  There are also
dump-frame-glyph-matrix (for TTY frames) and dump-tool-bar-row.  They
describe the data structures Emacs uses to draw its windows and
frames.  We could use them to provide some initial testing capability
for the display engine.  The disadvantages of using these functions
are that (a) they currently need Emacs build with GLYPH_DEBUG defined,
and (b) they don't test the terminal-specific parts of the display
engine (in xterm.c, w32term.c, nsterm.m, etc.) that actually write to
the glass.

Re: Take a screenshot from within Emacs

[joakim]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: joakim@verona.se
>> Date: Thu, 07 Jul 2016 21:57:41 +0200
>> Cc: Emacs developers <emacs-devel@gnu.org>
>> 
>> I don't think Emacs has the capability to access its internal rendering
>> data out of the box.
>
> Actually, it does, sort of.  Take a look at the dump-glyph-matrix
> function and the subroutines it calls.  There are also
> dump-frame-glyph-matrix (for TTY frames) and dump-tool-bar-row.  They
> describe the data structures Emacs uses to draw its windows and
> frames.  We could use them to provide some initial testing capability
> for the display engine.  The disadvantages of using these functions
> are that (a) they currently need Emacs build with GLYPH_DEBUG defined,
> and (b) they don't test the terminal-specific parts of the display
> engine (in xterm.c, w32term.c, nsterm.m, etc.) that actually write to
> the glass.

Yes you are right of course. I even used those routines while working
on the xwidget branch, but forgot.

-- 
Joakim Verona

Re: Take a screenshot from within Emacs

[psachin]

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https://github.com/psachin/.emacs.d/blob/config.org/custom_functions.org

See subsection: 'Screenshot frame'

On Fri, Jul 8, 2016 at 1:59 PM, <joakim@verona.se> wrote:

> Eli Zaretskii <eliz@gnu.org> writes:
>
> >> From: joakim@verona.se
> >> Date: Thu, 07 Jul 2016 21:57:41 +0200
> >> Cc: Emacs developers <emacs-devel@gnu.org>
> >>
> >> I don't think Emacs has the capability to access its internal rendering
> >> data out of the box.
> >
> > Actually, it does, sort of.  Take a look at the dump-glyph-matrix
> > function and the subroutines it calls.  There are also
> > dump-frame-glyph-matrix (for TTY frames) and dump-tool-bar-row.  They
> > describe the data structures Emacs uses to draw its windows and
> > frames.  We could use them to provide some initial testing capability
> > for the display engine.  The disadvantages of using these functions
> > are that (a) they currently need Emacs build with GLYPH_DEBUG defined,
> > and (b) they don't test the terminal-specific parts of the display
> > engine (in xterm.c, w32term.c, nsterm.m, etc.) that actually write to
> > the glass.
>
> Yes you are right of course. I even used those routines while working
> on the xwidget branch, but forgot.
>
> --
> Joakim Verona
>
>


-- 
Sachin
psachin.github.io

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Re: Take a screenshot from within Emacs

[Eli Zaretskii]

> From: psachin <iclcoolster@gmail.com>
> Date: Fri, 8 Jul 2016 14:43:00 +0530
> Cc: Eli Zaretskii <eliz@gnu.org>, clement.pit@gmail.com,
> 	Emacs developers <emacs-devel@gnu.org>
> 
> https://github.com/psachin/.emacs.d/blob/config.org/custom_functions.org
> 
> See subsection: 'Screenshot frame'

I believe Clément wanted to accomplish that without external programs.

Re: Take a screenshot from within Emacs

[Clément Pit--Claudel]

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On 2016-07-08 05:27, Eli Zaretskii wrote:
>> From: psachin <iclcoolster@gmail.com>
>> Date: Fri, 8 Jul 2016 14:43:00 +0530
>> Cc: Eli Zaretskii <eliz@gnu.org>, clement.pit@gmail.com,
>> 	Emacs developers <emacs-devel@gnu.org>
>>
>> https://github.com/psachin/.emacs.d/blob/config.org/custom_functions.org
>>
>> See subsection: 'Screenshot frame'
> 
> I believe Clément wanted to accomplish that without external programs.

That's correct :)


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Re: Take a screenshot from within Emacs

[Andrey Tykhonov]

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Hello!

You could try https://github.com/atykhonov/escr . It makes screenshots by
means of `import` utility (ImageMagick). It is possible to make a
screenshot of a frame, window and region. I hope you would find it useful.


--
Andrii

On 7 July 2016 at 22:44, Clément Pit--Claudel <clement.pit@gmail.com> wrote:

> Hey emacs-dev,
>
> How hard would it be to teach Emacs to make screenshots of itself? Not the
> Gtk menus or additional system-rendered elements — just buffer contents,
> windows, and frames.  I expect there wouldn't be a general solution; but
> maybe there is?  If not, how hard would it be to do it in the default
> configuration on GNU/Linux?
>
> And for bonus points: what about screenshots as SVG?
>
> Clément.
>
>

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Re: Take a screenshot from within Emacs

[Clément Pit--Claudel]

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On 2016-07-07 16:53, Andrey Tykhonov wrote:
> You could try https://github.com/atykhonov/escr . It makes
> screenshots by means of `import` utility (ImageMagick). It is
> possible to make a screenshot of a frame, window and region. I hope
> you would find it useful.

Thanks :) I'm looking for a way to do this without external dependencies, though, so ImageMagick won't do.


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