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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Improve DirectWrite implementation font rendering on Windows"
href="https://bugs.documentfoundation.org/show_bug.cgi?id=107521#c18">Comment # 18</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Improve DirectWrite implementation font rendering on Windows"
href="https://bugs.documentfoundation.org/show_bug.cgi?id=107521">bug 107521</a>
from <span class="vcard"><a class="email" href="mailto:telesto@surfxs.nl" title="Telesto <telesto@surfxs.nl>"> <span class="fn">Telesto</span></a>
</span></b>
<pre>Created <span class=""><a href="http://bugs.documentfoundation.org/attachment.cgi?id=136279" name="attach_136279" title="Xcode instruments time/leak profile and BT">attachment 136279</a> <a href="http://bugs.documentfoundation.org/attachment.cgi?id=136279&action=edit" title="Xcode instruments time/leak profile and BT">[details]</a></span>
Xcode instruments time/leak profile and BT
(In reply to V Stuart Foote from <a href="show_bug.cgi?id=107521#c11">comment #11</a>)
<span class="quote">> Rendering multiple text objects--especially cells in a Calc sheet when
> scrolling or resizing [1][2]--has slowed with default HA or CPU only
> rendering, though still reasonable with OpenGL.
>
> Likely requires additional font caching of some kind.</span >
Not sure if this is the read thread, but the slow scrolling problem seems to be
related to Harfbuzz (I would say). On MacOS at least.
Reference_table(hb_face_t*, unsigned int, void*) is leaking a little bit
(nearly not to mention) and consuming around 20% of the CPU time. I attached a
few screenshots and a BT. Based on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Scrolling complex document at zoomlevel 50% from 5.3 appears to be slower as it has been before"
href="show_bug.cgi?id=108574">bug 108574</a>)
Note: there is new version of Harfbuzz available (1.5.1). Last bump was to
1.4.8 (<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Tibetan long U not correctly rendered"
href="show_bug.cgi?id=109142">bug 109142</a>).</pre>
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