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Subject: bug#44172: 28.0.50; Exporting image data
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From: Lars Ingebrigtsen <larsi@HIDDEN>
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Content preview: There's been some discussion off-list about adding simple
image manipulation functions to Emacs, and there's really only three transforms
that are in scope for Emacs: Cropping, rotating and resizing.
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There's been some discussion off-list about adding simple image
manipulation functions to Emacs, and there's really only three
transforms that are in scope for Emacs: Cropping, rotating and resizing.
Now, there are packages out there that allow doing this, but they rely
on external programs to actually do the image wrangling. I wondered
what it would take to make it possible to do this in-Emacs, and I think
we basically have all the needed stuff -- we just need to hook it up and
make it available.
1) Making image data available to Emacs Lisp.
This is something that I've often wanted for other reasons -- I want to
know how an SVG was rendered, for instance (especially when doing
font-based stuff), and there's no way to actually tell.
So I think Emacs should have a function like
(export-image-data IMAGE &rest SPECS)
that will just take the image cache data for IMAGE (or the frame
specified by SPECS, if multi-frame) and dump the RGB(A) data into the
current buffer (which should be unibyte, for efficiency), and return
a plist of width/height/bytes-per-pixel/rgb(a) ordering. This is
basically the PPM binary format, but without the heading.
This allows us to do easy transforms like cropping and rotating from
Lisp, too.
2) Create image files.
But mogrifying images is all well and good, but if we can't save the
data, it's not much use. Of course we could just save the data as PPM,
but that's not very helpful. So Emacs needs to be able to write image
files... which sounds like a big thing, but it isn't really: As long as
we can save .jpeg and .png files, that's fine.
Fortunately, Emacs links with libpng and libjpeg already, so adding a
(encode-image-data TYPE)
function is less work than it would seem.
In GNU Emacs 28.0.50 (build 124, x86_64-pc-linux-gnu, GTK+ Version 3.24.23, cairo version 1.16.0)
of 2020-10-22 built on xo
Repository revision: 954a4decfcc8e41084789516773b22d0adc11d91
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Debian GNU/Linux bullseye/sid
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Lars Ingebrigtsen <larsi@HIDDEN> Subject: bug#44172: Acknowledgement (28.0.50; Exporting image data) Message-ID: <handler.44172.B.16034519341921.ack <at> debbugs.gnu.org> References: <87mu0dgpgv.fsf@HIDDEN> X-Gnu-PR-Message: ack 44172 X-Gnu-PR-Package: emacs Reply-To: 44172 <at> debbugs.gnu.org Date: Fri, 23 Oct 2020 11:19:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 44172 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 44172: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D44172 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
X-Loop: help-debbugs@HIDDEN
Subject: bug#44172: 28.0.50; Exporting image data
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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Date: Fri, 23 Oct 2020 13:18:40 +0200
>
> 2) Create image files.
Doesn't svg.el come close enough?
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Subject: bug#44172: 28.0.50; Exporting image data
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X-Now-Playing: Ossia's _Devil's Dance_: "(untitled)"
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Content preview: Eli Zaretskii <eliz@HIDDEN> writes: > Doesn't svg.el come
close enough? Not really -- if you have an image you've cropped, you can
certainly write it out as .svg, but it'd be huge. Then PPM would be preferable.
But neither are much good, in general.
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Eli Zaretskii <eliz@HIDDEN> writes:
> Doesn't svg.el come close enough?
Not really -- if you have an image you've cropped, you can certainly
write it out as .svg, but it'd be huge. Then PPM would be preferable.
But neither are much good, in general.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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Subject: bug#44172: 28.0.50; Exporting image data
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Date: Fri, 23 Oct 2020 17:24:19 +0100
From: Alan Third <alan@HIDDEN>
Message-ID: <20201023162419.GB59267@HIDDEN>
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On Fri, Oct 23, 2020 at 01:18:40PM +0200, Lars Ingebrigtsen wrote:
>
> 1) Making image data available to Emacs Lisp.
>
> This is something that I've often wanted for other reasons -- I want to
> know how an SVG was rendered, for instance (especially when doing
> font-based stuff), and there's no way to actually tell.
>
> So I think Emacs should have a function like
>
> (export-image-data IMAGE &rest SPECS)
>
> that will just take the image cache data for IMAGE (or the frame
> specified by SPECS, if multi-frame) and dump the RGB(A) data into the
> current buffer (which should be unibyte, for efficiency), and return
> a plist of width/height/bytes-per-pixel/rgb(a) ordering. This is
> basically the PPM binary format, but without the heading.
>
> This allows us to do easy transforms like cropping and rotating from
> Lisp, too.
Are you talking about using an image spec that we use to display
images, which can already include rotation and resizing?
That would be difficult because the stored image data doesn't have
those transformations applied, unless you're using imagemagick. We'd
have to draw it to a buffer (either on-screen or off) and then read
back that data.
--
Alan Third
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Date: Sat, 24 Oct 2020 21:51:05 +0200
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Content preview: Alan Third <alan@HIDDEN> writes: > Are you talking about
using an image spec that we use to display > images, which can already include
rotation and resizing? Yes.
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Alan Third <alan@HIDDEN> writes:
> Are you talking about using an image spec that we use to display
> images, which can already include rotation and resizing?
Yes.
> That would be difficult because the stored image data doesn't have
> those transformations applied, unless you're using imagemagick. We'd
> have to draw it to a buffer (either on-screen or off) and then read
> back that data.
But it's the untransformed data that we'd want here, so that sounds
great to me.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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Lars Ingebrigtsen <larsi@HIDDEN> writes:
> There's been some discussion off-list about adding simple image
> manipulation functions to Emacs, and there's really only three
> transforms that are in scope for Emacs: Cropping, rotating and resizing.
I think we should have a special `image-edit-mode' to support this. We
could have a keybinding to go to between that mode and `image-mode' (say
`C-x C-q').
In the short-term, I think `image-mode' should stop pretending it can
edit images by making `image-save' into an obsolete alias for
`write-file'.
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X-Now-Playing: Oval's _94diskont_: "Do While (Command X)"
Date: Sun, 31 Oct 2021 16:11:24 +0100
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Content preview: Stefan Kangas <stefan@HIDDEN> writes: > In the short-term,
I think `image-mode' should stop pretending it can > edit images by making
`image-save' into an obsolete alias for > `write-file'. Yup.
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Stefan Kangas <stefan@HIDDEN> writes:
> In the short-term, I think `image-mode' should stop pretending it can
> edit images by making `image-save' into an obsolete alias for
> `write-file'.
Yup.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
X-Loop: help-debbugs@HIDDEN
Subject: bug#44172: 28.0.50; Exporting image data
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Lars Ingebrigtsen <larsi@HIDDEN> writes:
> Stefan Kangas <stefan@HIDDEN> writes:
>
>> In the short-term, I think `image-mode' should stop pretending it can
>> edit images by making `image-save' into an obsolete alias for
>> `write-file'.
>
> Yup.
Oops, this doesn't actually work though, does it? For example,
`image-save' is also what gives us a command to save images in eww.
X-Loop: help-debbugs@HIDDEN
Subject: bug#44172: 28.0.50; Exporting image data
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Content preview: Stefan Kangas <stefan@HIDDEN> writes: >>> In the
short-term,
I think `image-mode' should stop pretending it can >>> edit images by making
`image-save' into an obsolete alias for >>> `write-file'. >> >> Yup. > >
Oops, this doesn't actually [...]
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Stefan Kangas <stefan@HIDDEN> writes:
>>> In the short-term, I think `image-mode' should stop pretending it can
>>> edit images by making `image-save' into an obsolete alias for
>>> `write-file'.
>>
>> Yup.
>
> Oops, this doesn't actually work though, does it? For example,
> `image-save' is also what gives us a command to save images in eww.
Oh, `image-save'! No, that can't be deprecated.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
X-Loop: help-debbugs@HIDDEN
Subject: bug#44172: bug#49347: image-save not working as expected for transformed image saving!
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Lars Ingebrigtsen <larsi@HIDDEN> writes:
> Oh, `image-save'! No, that can't be deprecated.
Maybe we should remove the key binding from `image-mode' though?
Or is it useful in `image-mode' buffers?
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Subject: bug#44172: bug#49347: image-save not working as expected for transformed image saving!
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Content preview: Stefan Kangas <stefan@HIDDEN> writes: > Lars Ingebrigtsen
<larsi@HIDDEN> writes: > >> Oh, `image-save'! No, that can't be deprecated.
> > Maybe we should remove the key binding from `image-mode' though? > Or
is it useful in `image-mode' [...]
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Stefan Kangas <stefan@HIDDEN> writes:
> Lars Ingebrigtsen <larsi@HIDDEN> writes:
>
>> Oh, `image-save'! No, that can't be deprecated.
>
> Maybe we should remove the key binding from `image-mode' though?
> Or is it useful in `image-mode' buffers?
It's not very useful in `image-mode' buffers, but it's nice for
consistency, perhaps? I think whenever you see an image in Emacs, you
should be able to interact with it that way.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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