* bug#52120: 29.0.50; XRender image transforms many magnitudes faster than Cairo image transforms
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@ 2021-11-26 8:06 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-01-19 9:42 ` bug#52120: Bug fixed Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
0 siblings, 1 reply; 2+ messages in thread
From: Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2021-11-26 8:06 UTC (permalink / raw)
To: 52120
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
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