GNU logs - #79204, boring messages

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Subject: bug#79204: [PATCH] pgtk: Use cairo_set_source_surface()
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: pwychowaniec <pwychowaniec@HIDDEN>
Subject: bug#79204: Acknowledgement ([PATCH] pgtk: Use cairo_set_source_surface())
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References: <M8yxlqYBNDCtxw7MCi6Ug8tgwI9aJYPbUwmdbjPzeDnGjfFYpfZ5llVP4JaxPEZ7EWzY7H3AqF9F0WSkzAkiAOxl8v5iscbq6Qs1X7NC15o=@pm.me>
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Date: Sat, 09 Aug 2025 16:45:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#79204: [PATCH] pgtk: Use cairo_set_source_surface()
Resent-From: Eli Zaretskii <eliz@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-gnu-emacs@HIDDEN
Resent-Date: Sat, 16 Aug 2025 10:47:02 +0000
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Resent-Sender: help-debbugs@HIDDEN
To: pwychowaniec <pwychowaniec@HIDDEN>, Po Lu <luangruo@HIDDEN>
Cc: 79204 <at> debbugs.gnu.org
Date: Sat, 16 Aug 2025 13:46:18 +0300
Message-Id: <86v7mnk0hx.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <M8yxlqYBNDCtxw7MCi6Ug8tgwI9aJYPbUwmdbjPzeDnGjfFYpfZ5llVP4JaxPEZ7EWzY7H3AqF9F0WSkzAkiAOxl8v5iscbq6Qs1X7NC15o=@pm.me>
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> Date: Sat, 09 Aug 2025 12:21:52 +0000
> From:  pwychowaniec via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> I'm submitting a patch that improves performance of previewing large images in Emacs; more details in the
> commit message.

Thanks.  Po Lu, could you please review and comment?

In any case, Patryk, to accept changes of this size we will need you
to sign a copyright assignment agreement.  If you agree, I will send
you the form to fill and the instructions to go with it.

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#79204: [PATCH] pgtk: Use cairo_set_source_surface()
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Cc: 79204 <at> debbugs.gnu.org, pwychowaniec@HIDDEN
Date: Sat, 30 Aug 2025 11:00:40 +0300
Message-Id: <86iki5qlw7.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <86v7mnk0hx.fsf@HIDDEN> (message from Eli Zaretskii on Sat, 16
 Aug 2025 13:46:18 +0300)
References: <M8yxlqYBNDCtxw7MCi6Ug8tgwI9aJYPbUwmdbjPzeDnGjfFYpfZ5llVP4JaxPEZ7EWzY7H3AqF9F0WSkzAkiAOxl8v5iscbq6Qs1X7NC15o=@pm.me>
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Ping!  Po Lu, could you please review the proposed patch?

> Cc: 79204 <at> debbugs.gnu.org
> Date: Sat, 16 Aug 2025 13:46:18 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> 
> > Date: Sat, 09 Aug 2025 12:21:52 +0000
> > From:  pwychowaniec via "Bug reports for GNU Emacs,
> >  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> > 
> > I'm submitting a patch that improves performance of previewing large images in Emacs; more details in the
> > commit message.
> 
> Thanks.  Po Lu, could you please review and comment?
> 
> In any case, Patryk, to accept changes of this size we will need you
> to sign a copyright assignment agreement.  If you agree, I will send
> you the form to fill and the instructions to go with it.
> 
> 
> 
>

Message sent to bug-gnu-emacs@HIDDEN:

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Ping! Ping!  Po Lu, please respond.

> Cc: 79204 <at> debbugs.gnu.org, pwychowaniec@HIDDEN
> Date: Sat, 30 Aug 2025 11:00:40 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> 
> Ping!  Po Lu, could you please review the proposed patch?
> 
> > Cc: 79204 <at> debbugs.gnu.org
> > Date: Sat, 16 Aug 2025 13:46:18 +0300
> > From: Eli Zaretskii <eliz@HIDDEN>
> > 
> > > Date: Sat, 09 Aug 2025 12:21:52 +0000
> > > From:  pwychowaniec via "Bug reports for GNU Emacs,
> > >  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> > > 
> > > I'm submitting a patch that improves performance of previewing large images in Emacs; more details in the
> > > commit message.
> > 
> > Thanks.  Po Lu, could you please review and comment?
> > 
> > In any case, Patryk, to accept changes of this size we will need you
> > to sign a copyright assignment agreement.  If you agree, I will send
> > you the form to fill and the instructions to go with it.
> > 
> > 
> > 
> > 
> 
> 
> 
>

Message sent to bug-gnu-emacs@HIDDEN:

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Date: Sat, 27 Sep 2025 11:49:57 +0300
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Ping! Ping! Ping!  Po Lu, could you please chime in?

> Cc: 79204 <at> debbugs.gnu.org, pwychowaniec@HIDDEN
> Date: Sat, 13 Sep 2025 10:44:52 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> 
> Ping! Ping!  Po Lu, please respond.
> 
> > Cc: 79204 <at> debbugs.gnu.org, pwychowaniec@HIDDEN
> > Date: Sat, 30 Aug 2025 11:00:40 +0300
> > From: Eli Zaretskii <eliz@HIDDEN>
> > 
> > Ping!  Po Lu, could you please review the proposed patch?
> > 
> > > Cc: 79204 <at> debbugs.gnu.org
> > > Date: Sat, 16 Aug 2025 13:46:18 +0300
> > > From: Eli Zaretskii <eliz@HIDDEN>
> > > 
> > > > Date: Sat, 09 Aug 2025 12:21:52 +0000
> > > > From:  pwychowaniec via "Bug reports for GNU Emacs,
> > > >  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> > > > 
> > > > I'm submitting a patch that improves performance of previewing large images in Emacs; more details in the
> > > > commit message.
> > > 
> > > Thanks.  Po Lu, could you please review and comment?
> > > 
> > > In any case, Patryk, to accept changes of this size we will need you
> > > to sign a copyright assignment agreement.  If you agree, I will send
> > > you the form to fill and the instructions to go with it.
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> > 
> > 
> 
> 
> 
>

Message sent to bug-gnu-emacs@HIDDEN:

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Ping! Ping! Ping! Ping!  Po Lu, please respond.

> Cc: 79204 <at> debbugs.gnu.org, pwychowaniec@HIDDEN
> Date: Sat, 27 Sep 2025 11:49:57 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> 
> Ping! Ping! Ping!  Po Lu, could you please chime in?
> 
> > Cc: 79204 <at> debbugs.gnu.org, pwychowaniec@HIDDEN
> > Date: Sat, 13 Sep 2025 10:44:52 +0300
> > From: Eli Zaretskii <eliz@HIDDEN>
> > 
> > Ping! Ping!  Po Lu, please respond.
> > 
> > > Cc: 79204 <at> debbugs.gnu.org, pwychowaniec@HIDDEN
> > > Date: Sat, 30 Aug 2025 11:00:40 +0300
> > > From: Eli Zaretskii <eliz@HIDDEN>
> > > 
> > > Ping!  Po Lu, could you please review the proposed patch?
> > > 
> > > > Cc: 79204 <at> debbugs.gnu.org
> > > > Date: Sat, 16 Aug 2025 13:46:18 +0300
> > > > From: Eli Zaretskii <eliz@HIDDEN>
> > > > 
> > > > > Date: Sat, 09 Aug 2025 12:21:52 +0000
> > > > > From:  pwychowaniec via "Bug reports for GNU Emacs,
> > > > >  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> > > > > 
> > > > > I'm submitting a patch that improves performance of previewing large images in Emacs; more details in the
> > > > > commit message.
> > > > 
> > > > Thanks.  Po Lu, could you please review and comment?
> > > > 
> > > > In any case, Patryk, to accept changes of this size we will need you
> > > > to sign a copyright assignment agreement.  If you agree, I will send
> > > > you the form to fill and the instructions to go with it.
> > > > 
> > > > 
> > > > 
> > > > 
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> > 
> > 
> 
> 
> 
>

Message sent to bug-gnu-emacs@HIDDEN:

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Ping! Ping! Ping! Ping! Ping!  Po Lu, are you there?

> Cc: 79204 <at> debbugs.gnu.org, pwychowaniec@HIDDEN
> Date: Sat, 11 Oct 2025 11:28:08 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> 
> Ping! Ping! Ping! Ping!  Po Lu, please respond.
> 
> > Cc: 79204 <at> debbugs.gnu.org, pwychowaniec@HIDDEN
> > Date: Sat, 27 Sep 2025 11:49:57 +0300
> > From: Eli Zaretskii <eliz@HIDDEN>
> > 
> > Ping! Ping! Ping!  Po Lu, could you please chime in?
> > 
> > > Cc: 79204 <at> debbugs.gnu.org, pwychowaniec@HIDDEN
> > > Date: Sat, 13 Sep 2025 10:44:52 +0300
> > > From: Eli Zaretskii <eliz@HIDDEN>
> > > 
> > > Ping! Ping!  Po Lu, please respond.
> > > 
> > > > Cc: 79204 <at> debbugs.gnu.org, pwychowaniec@HIDDEN
> > > > Date: Sat, 30 Aug 2025 11:00:40 +0300
> > > > From: Eli Zaretskii <eliz@HIDDEN>
> > > > 
> > > > Ping!  Po Lu, could you please review the proposed patch?
> > > > 
> > > > > Cc: 79204 <at> debbugs.gnu.org
> > > > > Date: Sat, 16 Aug 2025 13:46:18 +0300
> > > > > From: Eli Zaretskii <eliz@HIDDEN>
> > > > > 
> > > > > > Date: Sat, 09 Aug 2025 12:21:52 +0000
> > > > > > From:  pwychowaniec via "Bug reports for GNU Emacs,
> > > > > >  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> > > > > > 
> > > > > > I'm submitting a patch that improves performance of previewing large images in Emacs; more details in the
> > > > > > commit message.
> > > > > 
> > > > > Thanks.  Po Lu, could you please review and comment?
> > > > > 
> > > > > In any case, Patryk, to accept changes of this size we will need you
> > > > > to sign a copyright assignment agreement.  If you agree, I will send
> > > > > you the form to fill and the instructions to go with it.
> > > > > 
> > > > > 
> > > > > 
> > > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> > 
> > 
> 
> 
> 
>

Message sent to bug-gnu-emacs@HIDDEN:

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Eli Zaretskii <eliz@HIDDEN> writes:

>> Date: Sat, 09 Aug 2025 12:21:52 +0000
>> From:  pwychowaniec via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
>> 
>> I'm submitting a patch that improves performance of previewing large images in Emacs; more details in the
>> commit message.
>
> Thanks.  Po Lu, could you please review and comment?
>
> In any case, Patryk, to accept changes of this size we will need you
> to sign a copyright assignment agreement.  If you agree, I will send
> you the form to fill and the instructions to go with it.

I think we should first ask whether the OP has evaluated the
implications of creating a new image surface for each scaled image for
memory utilization, because under high-resolution configurations the
allocations required to retain scaled bitmaps in the image cache are
very liable to exceed users' systems' capabilities, while currently the
bottleneck in rendering these images is not so much copying from the
source pattern itself as scaling the smaller patterns to the dimensions
required by the display with rather inefficient code in cairo.  I can't
attest whether or not a solution satisfactory in both respects exists
though, at least without sidestepping cairo.

Message sent to bug-gnu-emacs@HIDDEN:

X-Loop: help-debbugs@HIDDEN
Subject: bug#79204: [PATCH] pgtk: Use cairo_set_source_surface()
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Patryk Wychowaniec <pwychowaniec@HIDDEN> writes:

> Hi,
>
> What kind of evaluation would be satisfactory?
>
> I don't think Emacs gathers telemetry data - nor I think it should -
> which means that I cannot reliably predict memory utilization before
> and after those changes for a typical user.
>
> What I can say, though, is that I've been using Emacs with this patch
> applied since August and it seems to work reliably - I haven't noticed
> any extra crashes, unusually heavy memory utilization, spurious OOM
> kills etc.
>
> Of course, I clearly see the potential problem of "load a million huge
> images, get Emacs OOM-killed" - I just think it's more of a
> /potential/ problem, not something I'd expect to happen to people over
> daily usage.

Measures should first be taken to account for the size of each surface
in `image_size_in_bytes' in image.c.  Afterwards, I suggest navigating
through a large album with image-mode, which will apply image
transforms, and contrasting the size of the image cache with `M-:
(image-cache-size) RET' with its size from an unmodified Emacs.

Message sent to bug-gnu-emacs@HIDDEN:

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Hi,

What kind of evaluation would be satisfactory?

I don't think Emacs gathers telemetry data - nor I think it should - which =
means that I cannot reliably predict memory utilization before and after th=
ose changes for a typical user.

What I can say, though, is that I've been using Emacs with this patch appli=
ed since August and it seems to work reliably - I haven't noticed any extra=
 crashes, unusually heavy memory utilization, spurious OOM kills etc.

Of course, I clearly see the potential problem of "load a million huge imag=
es, get Emacs OOM-killed" - I just think it's more of a /potential/ problem=
, not something I'd expect to happen to people over daily usage.

Cheers,
Patryk. =20

On Saturday, November 1st, 2025 at 06:44, Po Lu <luangruo@HIDDEN> wrote:

>=20
>=20
> Eli Zaretskii eliz@HIDDEN writes:
>=20
> > > Date: Sat, 09 Aug 2025 12:21:52 +0000
> > > From: pwychowaniec via "Bug reports for GNU Emacs,
> > > the Swiss army knife of text editors" bug-gnu-emacs@HIDDEN
> > >=20
> > > I'm submitting a patch that improves performance of previewing large =
images in Emacs; more details in the
> > > commit message.
> >=20
> > Thanks. Po Lu, could you please review and comment?
> >=20
> > In any case, Patryk, to accept changes of this size we will need you
> > to sign a copyright assignment agreement. If you agree, I will send
> > you the form to fill and the instructions to go with it.
>=20
>=20
> I think we should first ask whether the OP has evaluated the
> implications of creating a new image surface for each scaled image for
> memory utilization, because under high-resolution configurations the
> allocations required to retain scaled bitmaps in the image cache are
> very liable to exceed users' systems' capabilities, while currently the
> bottleneck in rendering these images is not so much copying from the
> source pattern itself as scaling the smaller patterns to the dimensions
> required by the display with rather inefficient code in cairo. I can't
> attest whether or not a solution satisfactory in both respects exists
> though, at least without sidestepping cairo.

Message sent to bug-gnu-emacs@HIDDEN:

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Hi,

I've adjusted the code to measure surface sizes like so:

```
diff --git a/src/image.c b/src/image.c
index c5caaf739e7..7ace960a69a 100644
--- a/src/image.c
+++ b/src/image.c
@@ -2472,6 +2484,9 @@ image_size_in_bytes (struct image *img)
   Emacs_Pixmap msk =3D img->mask;
   if (msk)
     size +=3D msk->height * msk->bytes_per_line;
+  cairo_surface_t *sfc =3D img->cr_surface;
+  if (sfc)
+    size +=3D cairo_image_surface_get_stride (sfc) * cairo_image_surface_g=
et_height (sfc);
=20
 #elif defined HAVE_X_WINDOWS || defined HAVE_ANDROID
   /* Use a nominal depth of 24 and a bpp of 32 for pixmap and 1 bpp
```

Then I went through a directory of 80 photos - of mixed size, between 75 KB=
 [800x450 px] to 20 MB [2225x1537 px] - and obtained the following results =
of `(image-cache-size)`:

Emacs 30.2 (without patch):
356836176 =3D~ 340 MB

Emacs 30.2 (with patch):
704778048 =3D~ 672 MB

In both cases the baseline (start measurement without having explicitly ope=
ned any images) is < 1 KB.

Cheers,
Patryk.

On Sunday, November 2nd, 2025 at 01:35, Po Lu <luangruo@HIDDEN> wrote:

>=20
>=20
> Patryk Wychowaniec pwychowaniec@HIDDEN writes:
>=20
> > Hi,
> >=20
> > What kind of evaluation would be satisfactory?
> >=20
> > I don't think Emacs gathers telemetry data - nor I think it should -
> > which means that I cannot reliably predict memory utilization before
> > and after those changes for a typical user.
> >=20
> > What I can say, though, is that I've been using Emacs with this patch
> > applied since August and it seems to work reliably - I haven't noticed
> > any extra crashes, unusually heavy memory utilization, spurious OOM
> > kills etc.
> >=20
> > Of course, I clearly see the potential problem of "load a million huge
> > images, get Emacs OOM-killed" - I just think it's more of a
> > /potential/ problem, not something I'd expect to happen to people over
> > daily usage.
>=20
>=20
> Measures should first be taken to account for the size of each surface
> in `image_size_in_bytes' in image.c. Afterwards, I suggest navigating thr=
ough a large album with image-mode, which will apply image transforms, and =
contrasting the size of the image cache with` M-:
> (image-cache-size) RET' with its size from an unmodified Emacs.

Message sent to bug-gnu-emacs@HIDDEN:

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> Date: Tue, 11 Nov 2025 15:06:00 +0000
> From: Patryk Wychowaniec <pwychowaniec@HIDDEN>
> Cc: Eli Zaretskii <eliz@HIDDEN>, 79204 <at> debbugs.gnu.org
> 
> Hi,
> 
> I've adjusted the code to measure surface sizes like so:
> 
> ```
> diff --git a/src/image.c b/src/image.c
> index c5caaf739e7..7ace960a69a 100644
> --- a/src/image.c
> +++ b/src/image.c
> @@ -2472,6 +2484,9 @@ image_size_in_bytes (struct image *img)
>    Emacs_Pixmap msk = img->mask;
>    if (msk)
>      size += msk->height * msk->bytes_per_line;
> +  cairo_surface_t *sfc = img->cr_surface;
> +  if (sfc)
> +    size += cairo_image_surface_get_stride (sfc) * cairo_image_surface_get_height (sfc);
>  
>  #elif defined HAVE_X_WINDOWS || defined HAVE_ANDROID
>    /* Use a nominal depth of 24 and a bpp of 32 for pixmap and 1 bpp
> ```
> 
> Then I went through a directory of 80 photos - of mixed size, between 75 KB [800x450 px] to 20 MB [2225x1537 px] - and obtained the following results of `(image-cache-size)`:
> 
> Emacs 30.2 (without patch):
> 356836176 =~ 340 MB
> 
> Emacs 30.2 (with patch):
> 704778048 =~ 672 MB
> 
> In both cases the baseline (start measurement without having explicitly opened any images) is < 1 KB.

Thanks.

Po Lu, how to proceed with this?

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From: Po Lu <luangruo@HIDDEN>
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Eli Zaretskii <eliz@HIDDEN> writes:

>> Date: Tue, 11 Nov 2025 15:06:00 +0000
>> From: Patryk Wychowaniec <pwychowaniec@HIDDEN>
>> Cc: Eli Zaretskii <eliz@HIDDEN>, 79204 <at> debbugs.gnu.org
>> 
>> Hi,
>> 
>> I've adjusted the code to measure surface sizes like so:
>> 
>> ```
>> diff --git a/src/image.c b/src/image.c
>> index c5caaf739e7..7ace960a69a 100644
>> --- a/src/image.c
>> +++ b/src/image.c
>> @@ -2472,6 +2484,9 @@ image_size_in_bytes (struct image *img)
>>    Emacs_Pixmap msk = img->mask;
>>    if (msk)
>>      size += msk->height * msk->bytes_per_line;
>> +  cairo_surface_t *sfc = img->cr_surface;
>> +  if (sfc)
>> +    size += cairo_image_surface_get_stride (sfc) * cairo_image_surface_get_height (sfc);
>>  
>>  #elif defined HAVE_X_WINDOWS || defined HAVE_ANDROID
>>    /* Use a nominal depth of 24 and a bpp of 32 for pixmap and 1 bpp
>> ```
>> 
>> Then I went through a directory of 80 photos - of mixed size, between 75 KB [800x450 px] to 20 MB [2225x1537 px] - and obtained the following results of `(image-cache-size)`:
>> 
>> Emacs 30.2 (without patch):
>> 356836176 =~ 340 MB
>> 
>> Emacs 30.2 (with patch):
>> 704778048 =~ 672 MB
>> 
>> In both cases the baseline (start measurement without having explicitly opened any images) is < 1 KB.
>
> Thanks.
>
> Po Lu, how to proceed with this?

A twofold increase in image memory consumption might not be acceptable
to many users.  What do you (and the list) think?

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From: Steven Allen <steven@HIDDEN>
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--=-=-=
Content-Type: text/plain

Po Lu <luangruo@HIDDEN> writes:

> Eli Zaretskii <eliz@HIDDEN> writes:
>
>>> Date: Tue, 11 Nov 2025 15:06:00 +0000
>>> From: Patryk Wychowaniec <pwychowaniec@HIDDEN>
>>> Cc: Eli Zaretskii <eliz@HIDDEN>, 79204 <at> debbugs.gnu.org
>>> 
>>> Hi,
>>> 
>>> I've adjusted the code to measure surface sizes like so:
>>> 
>>> ```
>>> diff --git a/src/image.c b/src/image.c
>>> index c5caaf739e7..7ace960a69a 100644
>>> --- a/src/image.c
>>> +++ b/src/image.c
>>> @@ -2472,6 +2484,9 @@ image_size_in_bytes (struct image *img)
>>>    Emacs_Pixmap msk = img->mask;
>>>    if (msk)
>>>      size += msk->height * msk->bytes_per_line;
>>> +  cairo_surface_t *sfc = img->cr_surface;
>>> +  if (sfc)
>>> +    size += cairo_image_surface_get_stride (sfc) * cairo_image_surface_get_height (sfc);
>>>  
>>>  #elif defined HAVE_X_WINDOWS || defined HAVE_ANDROID
>>>    /* Use a nominal depth of 24 and a bpp of 32 for pixmap and 1 bpp
>>> ```
>>> 
>>> Then I went through a directory of 80 photos - of mixed size, between 75 KB [800x450 px] to 20 MB [2225x1537 px] - and obtained the following results of `(image-cache-size)`:
>>> 
>>> Emacs 30.2 (without patch):
>>> 356836176 =~ 340 MB
>>> 
>>> Emacs 30.2 (with patch):
>>> 704778048 =~ 672 MB
>>> 
>>> In both cases the baseline (start measurement without having explicitly opened any images) is < 1 KB.
>>
>> Thanks.
>>
>> Po Lu, how to proceed with this?
>
> A twofold increase in image memory consumption might not be acceptable
> to many users.  What do you (and the list) think?

I can't speak for everyone, but I'd be VERY happy to pay a 2x memory
cost to have this issue fixed. This issue affects non-PGTK Cairo builds
as well and has been a frequent source of frustration for me.

I've attached an additional patch that ports the fix in bug#79204 to
apply to non-PGTK Cairo builds as well. It significantly improves Emacs'
responsiveness when working with large images, this time on X+Cairo
(with no toolkit).

For some context, I submitted [1] a hack to work around this by reducing
the quality of the image scaling algorithm, but this new patch is MUCH
more effective than my hack and doesn't sacrificing quality.

Rahguzar (author of the pdf-tools continuous scroll patch, CCed) has
also run into these issues [2].

[1] https://lists.gnu.org/r/emacs-devel/2025-07/msg00475.html
[2] https://mail.gnu.org/archive/html/emacs-devel/2025-10/msg00630.html


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0002-x-Use-cairo_set_source_surface-as-well.patch

From 638781283e15edfedd65aea073dc0e96f9286918 Mon Sep 17 00:00:00 2001
From: Steven Allen <steven@HIDDEN>
Date: Sat, 22 Nov 2025 20:43:58 -0800
Subject: [PATCH 2/2] x: Use cairo_set_source_surface() as well

This ports the PGTK changes from the previous patch to X/Cairo builds.

* src/xterm.c (x_cr_draw_image): Use cairo_set_source_surface.
(x_draw_fringe_bitmap): Pass no surface to x_cr_draw_image.
(x_draw_image_foreground): Pass a pointer to the surface to x_cr_image.
---
 src/xterm.c | 43 ++++++++++++++++++++++++++++++++++++-------
 1 file changed, 36 insertions(+), 7 deletions(-)

diff --git a/src/xterm.c b/src/xterm.c
index e47a836713a..7f92f2bb889 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -6287,8 +6287,8 @@ x_cr_destroy_fringe_bitmap (int which)
 
 static void
 x_cr_draw_image (struct frame *f, GC gc, cairo_pattern_t *image,
-		 int src_x, int src_y, int width, int height,
-		 int dest_x, int dest_y, bool overlay_p)
+		 cairo_surface_t **surface, int src_x, int src_y, int width,
+		 int height, int dest_x, int dest_y, bool overlay_p)
 {
   cairo_t *cr = x_begin_cr_clip (f, gc);
 
@@ -6303,12 +6303,40 @@ x_cr_draw_image (struct frame *f, GC gc, cairo_pattern_t *image,
 
   cairo_translate (cr, dest_x - src_x, dest_y - src_y);
 
-  cairo_surface_t *surface;
-  cairo_pattern_get_surface (image, &surface);
-  cairo_format_t format = cairo_image_surface_get_format (surface);
+  cairo_surface_t *image_surface;
+  cairo_pattern_get_surface (image, &image_surface);
+  cairo_format_t format = cairo_image_surface_get_format (image_surface);
+
   if (format != CAIRO_FORMAT_A8 && format != CAIRO_FORMAT_A1)
     {
-      cairo_set_source (cr, image);
+      /* Since drawing surfaces is much faster than drawing patterns,
+	 let's try to convert this image into a surface and cache it.  */
+      if (surface)
+	{
+	  if (!*surface)
+	    {
+	      int image_width = cairo_image_surface_get_width (image_surface);
+	      int image_height = cairo_image_surface_get_height (image_surface);
+
+	      *surface = cairo_surface_create_similar_image (image_surface,
+							     format,
+							     image_width,
+							     image_height);
+
+	      cairo_t *cr2 = cairo_create (*surface);
+
+	      cairo_set_source (cr2, image);
+	      cairo_paint (cr2);
+	      cairo_destroy (cr2);
+	    }
+
+	  cairo_set_source_surface (cr, *surface, 0, 0);
+	}
+      else
+	{
+	  cairo_set_source (cr, image);
+	}
+
       cairo_fill (cr);
     }
   else
@@ -7910,7 +7938,7 @@ x_draw_fringe_bitmap (struct window *w, struct glyph_row *row,
 	     daemon Emacs.  Create the missing pattern now.  */
 	  gui_define_fringe_bitmap (f, p->which);
 	}
-      x_cr_draw_image (f, gc, fringe_bmp[p->which], 0, p->dh,
+      x_cr_draw_image (f, gc, fringe_bmp[p->which], NULL, 0, p->dh,
 		       p->wd, p->h, p->x, p->y, p->overlay_p);
       XSetForeground (display, gc, gcv.foreground);
       XSetBackground (display, gc, gcv.background);
@@ -10181,6 +10209,7 @@ x_draw_image_foreground (struct glyph_string *s)
     {
       x_set_glyph_string_clipping (s);
       x_cr_draw_image (s->f, s->gc, s->img->cr_data,
+		       (cairo_surface_t **) &s->img->cr_surface,
 		       s->slice.x, s->slice.y, s->slice.width, s->slice.height,
 		       x, y, true);
       if (!s->img->mask)
-- 
2.52.0


--=-=-=--

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In-Reply-To: <873465mt9l.fsf@HIDDEN> (message from Po Lu on Sun, 23 Nov
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> From: Po Lu <luangruo@HIDDEN>
> Cc: Patryk Wychowaniec <pwychowaniec@HIDDEN>,  79204 <at> debbugs.gnu.org,
>  emacs-devel@HIDDEN
> Date: Sun, 23 Nov 2025 09:28:54 +0800
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> >> Date: Tue, 11 Nov 2025 15:06:00 +0000
> >> From: Patryk Wychowaniec <pwychowaniec@HIDDEN>
> >> Cc: Eli Zaretskii <eliz@HIDDEN>, 79204 <at> debbugs.gnu.org
> >> 
> >> Hi,
> >> 
> >> I've adjusted the code to measure surface sizes like so:
> >> 
> >> ```
> >> diff --git a/src/image.c b/src/image.c
> >> index c5caaf739e7..7ace960a69a 100644
> >> --- a/src/image.c
> >> +++ b/src/image.c
> >> @@ -2472,6 +2484,9 @@ image_size_in_bytes (struct image *img)
> >>    Emacs_Pixmap msk = img->mask;
> >>    if (msk)
> >>      size += msk->height * msk->bytes_per_line;
> >> +  cairo_surface_t *sfc = img->cr_surface;
> >> +  if (sfc)
> >> +    size += cairo_image_surface_get_stride (sfc) * cairo_image_surface_get_height (sfc);
> >>  
> >>  #elif defined HAVE_X_WINDOWS || defined HAVE_ANDROID
> >>    /* Use a nominal depth of 24 and a bpp of 32 for pixmap and 1 bpp
> >> ```
> >> 
> >> Then I went through a directory of 80 photos - of mixed size, between 75 KB [800x450 px] to 20 MB [2225x1537 px] - and obtained the following results of `(image-cache-size)`:
> >> 
> >> Emacs 30.2 (without patch):
> >> 356836176 =~ 340 MB
> >> 
> >> Emacs 30.2 (with patch):
> >> 704778048 =~ 672 MB
> >> 
> >> In both cases the baseline (start measurement without having explicitly opened any images) is < 1 KB.
> >
> > Thanks.
> >
> > Po Lu, how to proceed with this?
> 
> A twofold increase in image memory consumption might not be acceptable
> to many users.  What do you (and the list) think?

300 MB of extra doesn't sound too bad, if the gains are significant.
Two orders of magnitude is quite a lot better.

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Steven Allen <steven@HIDDEN> writes:

> I can't speak for everyone, but I'd be VERY happy to pay a 2x memory
> cost to have this issue fixed. This issue affects non-PGTK Cairo builds
> as well and has been a frequent source of frustration for me.
>
> I've attached an additional patch that ports the fix in bug#79204 to
> apply to non-PGTK Cairo builds as well. It significantly improves Emacs'
> responsiveness when working with large images, this time on X+Cairo
> (with no toolkit).
>
> For some context, I submitted [1] a hack to work around this by reducing
> the quality of the image scaling algorithm, but this new patch is MUCH
> more effective than my hack and doesn't sacrificing quality.
>
> Rahguzar (author of the pdf-tools continuous scroll patch, CCed) has
> also run into these issues [2].

Slow scrolling in the presence of scaled images is a big problem for
`pdf-tools` especially with high density screens. Scrolling gets very
slow if a scaled images is being displayed. I have not tested the
patch but I think twice the amount of memory usage by cache is a trade
off worth making.

Last modified: Tue, 25 Nov 2025 20:30:02 UTC

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