https://bugs.freedesktop.org/show_bug.cgi?id=87485
Bug ID: 87485
Summary: Writer: embedded PNG results in slow scrolling
Product: LibreOffice
Version: 4.3.4.1 release
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Writer
Assignee: [email protected]
Reporter: [email protected]
Created attachment 111035
--> https://bugs.freedesktop.org/attachment.cgi?id=111035&action=edit
one of the PNG files that cause trouble
Hello
I haven't had the time (writing PhD keeps me too busy) to check this on other
distributions, other parts of LibO or the MS Windows version; but I found that
embedding certain PNG images in Writer slows down scrolling extremely.
I also only tested this on a Kabini yet (Athlon 5350, amd64) with free driver
stack (Gentoo, most of GPU related stuff / Kernel is latest ~amd64 tree).
(Writer/LibO is 4.3.4.1., and I like to keep away from strange CFLAGs)
I have video accel on and I thought graphics cache setting should be enough.
Anyway, scrolling becomes unbearably slow - as everything else. htop however
did not really show high CPU usage.
As soon as the picture is off the visible screen things become better.
However it is interesting that the "same" file as JPEG does not cause any
noticeable slowdown. The PNG iirc does not use transparency. It happened to
most PNGs I used yet. (some with additional graphics in kolourpaint, some made
with a W32 program that we need to get the raw data on screen). Strangely a few
directly from gnuplot are fairly okay. Could that be a matter of colour depth?
Compression?
Anyway, writer should be able to handle all images thrown at it or issue a
warning if an image's compression violates good practises. :)
Cheers and have a nice Christmas/holiday time
PS: I added a PNG image as sample, maybe you are able to reproduce the problem
with it.
--
You are receiving this mail because:
You are the assignee for the bug.
_______________________________________________
Libreoffice-bugs mailing list
[email protected]
http://lists.freedesktop.org/mailman/listinfo/libreoffice-bugs
