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bug#58101: 28.2; image-size nonsensical
From: |
Thomas Hühn |
Subject: |
bug#58101: 28.2; image-size nonsensical |
Date: |
Tue, 27 Sep 2022 11:00:22 +0200 |
User-agent: |
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.13.1 |
Hi,
first of all, I think this bug could be merged with #52931, I found that
only afterwards.
On 27.09.2022 08:05, Eli Zaretskii wrote:
Date: Mon, 26 Sep 2022 20:41:45 +0200
From: Thomas Hühn <t@2uo.de>
* Download image https://imgs.xkcd.com/comics/two_key_system_2x.png to
disk
* Run (create-image "two_key_system_2x.png") --> (image :type png :file
"two_key_system_2x.png" :scale 1.2038461538461538 :transform-smoothing
t)
* Run (image-size (create-image "two_key_system_2x.png") :pixels) -->
(30 . 30)
Expected result: (1291 . 632)
I cannot reproduce this here. I get the expected result. I also get
Now it seems like it's an intermittent problem.
Until yesterday (for several weaks where I've tried it every now and
then) it resulted in what I wrote in this bug.
Then I found #52931 and tried Markus' lines.
In my opinion,
(image-size (create-image "two_key_system_2x.png") :pixels)
and
(let ((img (create-image "two_key_system_2x.png")))
(image-size img t))
should give the same result, but it didn't! Markus' line gave 1554 .
760, mine gave 30 . 30.
Later yesterday evening both gave 1554 . 760.
After some googling I found image-scaling-factor, and after setting that
to 1, I always get the expected 1291 . 632 now.
(By the way, I think image-size should ignore that variable – I'm not
displaying the image anywhere, so any display scaling shouldn't
interfere – my use case would be inserting width and height attributes
in HTML where I certainly want the original image dimensions)
this result from create-image:
(image :type png :file "two_key_system_2x.png" :scale 1 :transform-smoothing
t)
With emacs -Q:
(image :type png :file "two_key_system_2x.png" :scale 1.2
:transform-smoothing t)
That scaling factor is different now. I'll continue with emacs -Q from
now on.
Is this in "emacs -Q"? If so, what version of libpng do you have
mingw64/mingw-w64-x86_64-libpng 1.6.38-1 [installed]
installed there? And what happens if you start Emacs like this:
emacs -Q --eval "(setq w32-use-native-image-API t)"
(image-size (create-image "two_key_system_2x.png") :pixels)
--> (1549 . 758)
(let ((img (create-image "two_key_system_2x.png")))
(image-size img t))
--> (1549 . 758)
Have a nice day!
Thomas
--
Wunderschön illustrierte Kinderbücher:
https://www.schoene-kinderbuecher.de
Weblog:
https://www.thomas-huehn.de
- bug#58101: 28.2; image-size nonsensical, Thomas Hühn, 2022/09/26
- bug#58101: 28.2; image-size nonsensical, Eli Zaretskii, 2022/09/27
- bug#58101: 28.2; image-size nonsensical,
Thomas Hühn <=
- bug#58101: 28.2; image-size nonsensical, Eli Zaretskii, 2022/09/27
- bug#58101: 28.2; image-size nonsensical, Thomas Hühn, 2022/09/27
- bug#58101: 28.2; image-size nonsensical, Eli Zaretskii, 2022/09/27
- bug#58101: 28.2; image-size nonsensical, Lars Ingebrigtsen, 2022/09/27
- bug#58101: 28.2; image-size nonsensical, Eli Zaretskii, 2022/09/27
- bug#58101: 28.2; image-size nonsensical, Stefan Kangas, 2022/09/27
- bug#58101: 28.2; image-size nonsensical, Lars Ingebrigtsen, 2022/09/27
- bug#58101: 28.2; image-size nonsensical, Eli Zaretskii, 2022/09/27
- bug#58101: 28.2; image-size nonsensical, Thomas Hühn, 2022/09/27
- bug#58101: 28.2; image-size nonsensical, Lars Ingebrigtsen, 2022/09/27