From: Arthur Miller <arthur.miller@live.com>
To: emacs-devel@gnu.org
Subject: Image transforms as a benchmark?
Date: Sun, 12 Sep 2021 13:45:39 +0200 [thread overview]
Message-ID: <AM9PR09MB497767C7F6D2AC76C5D1C08496D89@AM9PR09MB4977.eurprd09.prod.outlook.com> (raw)
I tried to make another little benchmark, I saw with optimization flags, that
quite some loops have got unrolled and vectorized in image.c, so I wanted to see
if it matters when doing some transforms on images. I tested so far just with
svg.
I wonder if image-rotate is handled completely by external libraries? I see
no effect on performance, regardless of how many time I rotate some image. Is it
same situation for scaling down? I see big difference when scaling up images so
I guess that is handled by Emacs own code?
#+begin_src emacs-lisp
(require 'svg)
(defun svg-position (image)
"Return buffer position of the svg image."
(let ((marker (cdr (assoc :image (car-safe (cdr image))))))
(when (markerp marker)
(marker-position marker))))
(defun svg-image-rotate (svg &optional angle)
(let ((image (image--get-image (svg-position svg))))
(setf (image-property image :rotation)
(float (mod (+ (or (image-property image :rotation) 0)
(or angle 90))
360)))))
(defun svg-increase-size ()
(with-temp-buffer
(let ((svg (svg-create 10 10))
(max-image-size t))
(svg-rectangle svg 0 0 10 10)
(svg-insert-image svg)
(dotimes (_ 40)
;; use internal image--change-size
;; to bypass the optimization with idle-timer.
(image--change-size
(1+ (/ (prefix-numeric-value 2) 10.0))
(svg-position svg))))))
(defun svg-decrease-size ()
(with-temp-buffer
(let ((svg (svg-create 10 10)))
(svg-rectangle svg 0 0 10 10)
(svg-insert-image svg)
(dotimes (_ 20)
(image--change-size
(- 1 (/ (prefix-numeric-value 0.1) 10.0))
(svg-position svg))))))
#+end_src
next reply other threads:[~2021-09-12 11:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-12 11:45 Arthur Miller [this message]
2021-09-12 12:12 ` Image transforms as a benchmark? Alan Third
2021-09-12 13:28 ` Arthur Miller
2021-09-12 15:50 ` Alan Third
2021-09-12 17:50 ` Arthur Miller
2021-09-12 12:17 ` Eli Zaretskii
2021-09-12 13:29 ` Arthur Miller
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