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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - Optimize OutputDevice to only call ImplRefreshAllFontData once after reading all embedded fonts"
href="https://bugs.documentfoundation.org/show_bug.cgi?id=114697">114697</a>
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<th>Summary</th>
<td>Optimize OutputDevice to only call ImplRefreshAllFontData once after reading all embedded fonts
</td>
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<th>Product</th>
<td>LibreOffice
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>UNCONFIRMED
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>LibreOffice
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<th>Assignee</th>
<td>libreoffice-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>mikekaganski@hotmail.com
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<p>
<div>
<pre>When opening documents with multiple embedded fonts, the operation takes much
time (at least on Windows), the more fonts are installed on system - the
longer.
To test, open <span class=""><a href="http://bugs.documentfoundation.org/attachment.cgi?id=117368" name="attach_117368" title="second doc">attachment 117368</a> <a href="http://bugs.documentfoundation.org/attachment.cgi?id=117368&action=edit" title="second doc">[details]</a></span>. It contains multiple fonts, and its opening
may take several minutes (>2 minutes on my system).
The problem is repeated call to OutputDevice::ImplRefreshAllFontData, that ends
each OutputDevice::AddTempDevFont. The call executes
OutputDevice::ImplRefreshFontData for all windows in application. It may take
several seconds (I see 6 s on my system) each.
The proposal is to implement a way to avoid doing the expensive operations
until all the fonts had been read. I see at least two ways to approach this:
1. Add a flag to ImplGetSVData()->maGDIData, that would tell
OutputDevice::ImplRefreshAllFontData not to do anything; set in at the
beginning of SaxExpatParser::parseStream (or another suitable function), and
reset at the end (with refresh).
2. Reimplement the logic, so that invalidation would set a flag, and then any
function that needs access to the data, would trigger the refresh and reset the
flag.</pre>
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