[Libreoffice-bugs] [Bug 121059] New: Scrolling down in print preview causes memory usage to increase rapidly

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=121059

            Bug ID: 121059
           Summary: Scrolling down in print preview causes memory usage to
                    increase rapidly
           Product: LibreOffice
           Version: 6.2.0.0.alpha1+ Master
          Hardware: All
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: telesto at surfxs.nl

Description:
Scrolling down in print preview causes memory usage to increase rapidly

Steps to Reproduce:
1. Open the attachment 145863
2. Wait until loading is finished (CPU drops back)
3. Switch to print preview
4. Press Page Down -> Memory usage keeps increasing

Actual Results:
Memory usage keeps increasing

Expected Results:
Steady memory usage


Reproducible: Always


User Profile Reset: Yes



Additional Info:
Version: 6.2.0.0.alpha1+
Build ID: 2e184378da6058af14acf208d6469fadf44d04ed
CPU threads: 4; OS: Windows 6.3; UI render: default; VCL: win; 
TinderBox: Win-x86 at 42, Branch:master, Time: 2018-10-30_03:29:39
Locale: nl-NL (nl_NL); Calc: CL

Bisected to (see bug 120735 comment 10)
author  Miklos Vajna <vmiklos at collabora.co.uk>  2018-08-31 18:19:12 +0200
committer       Miklos Vajna <vmiklos at collabora.co.uk>  2018-09-03 09:13:32
+0200
commit  aeff83240c88435d11590f5e9c6fe9927a508c6a (patch)
tree    a3b918a7d3164ee428a4df39df7118a87618dfd9
parent  08b5048198d59441cb8033ed14cd17e68c943004 (diff)
sw: save more vcl layout calls in SwFntObj
This builds on top of commit 436b829f5b904d76039db0818cff5dedf1ae89f1
(sw: save one vcl layout call in SwFntObj::DrawText(), 2018-08-16), but
now layouts are shared not only inside SwFntObj::DrawText(), but also
between SwFntObj::GetTextSize() and SwFntObj::DrawText().

To get there, create an SwFntObj cache member that stores already
calculated vcl layouts. SwFntObj already derives from SwCacheObj, so no
need to explicitly expire this cache member.

Total number of GenericSalLayout::LayoutText() invocations go down from
8 to 5 with this when pressing a key in Writer.

https://cgit.freedesktop.org/libreoffice/core/commit/?id=aeff83240c88435d11590f5e9c6fe9927a508c6a

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