GNU bug report logs - #52120
29.0.50; XRender image transforms many magnitudes faster than Cairo image transforms

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Package: emacs;

Reported by: Po Lu <luangruo <at> yahoo.com>

Date: Fri, 26 Nov 2021 08:08:02 UTC

Severity: normal

Found in version 29.0.50

Done: Po Lu <luangruo <at> yahoo.com>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#52120; Package emacs. (Fri, 26 Nov 2021 08:08:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to Po Lu <luangruo <at> yahoo.com>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Fri, 26 Nov 2021 08:08:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; XRender image transforms many magnitudes faster than Cairo
 image transforms
Date: Fri, 26 Nov 2021 16:06:46 +0800

Try to pixel-scroll (using better-pixel-scroll-mode', soon to be
pixel-scroll-precise-mode) through an image with transforms (you can see
such an example by using eww to browse to gnu.org).

On a build without Cairo, which uses the X rendering extension to
achieve hardware acceleration of image scaling, everything is perfectly
smooth.  On a build with Cairo, it takes around second to scroll through
one or two pixels of such an image.

If nobody else knows why this is the case, I plan to look into it in a
few days, as this is within my field of expertise.  Thanks.

In GNU Emacs 29.0.50 (build 318, x86_64-pc-linux-gnu, GTK+ Version 3.24.30)
 of 2021-11-26 built on trinity
Repository revision: 4e9f78d2a4c5608eeb056b5ecd159b6ea251372e
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Fedora Linux 35 (Workstation Edition)

Configured using:
 'configure --without-cairo --with-xinput2 --cache-file=/tmp/ccache'

Configured features:
ACL DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON LCMS2
LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XFT XIM
XINPUT2 XPM GTK3 ZLIB
Reply sent to Po Lu <luangruo <at> yahoo.com>:
You have taken responsibility. (Wed, 19 Jan 2022 09:43:02 GMT) Full text and rfc822 format available.
Notification sent to Po Lu <luangruo <at> yahoo.com>:
bug acknowledged by developer. (Wed, 19 Jan 2022 09:43:02 GMT) Full text and rfc822 format available.

Message #10 received at 52120-done <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: 52120-done <at> debbugs.gnu.org
Subject: Bug fixed
Date: Wed, 19 Jan 2022 17:42:24 +0800

Should be fixed in de614ec950.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Wed, 16 Feb 2022 12:24:05 GMT) Full text and rfc822 format available.
This bug report was last modified 2 years and 70 days ago.

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