https://bugs.documentfoundation.org/show_bug.cgi?id=155212
--- Comment #19 from Patrick Luby (volunteer) <guibomac...@gmail.com> ---
Since this bug only occurs on macOS, I used the debug patch at the end of this
comment to see how much time is being spent loading macOS fonts. In my tests,
"--convert-to pdf With-Fonts.odt" takes at least 20 seconds on my M1 MacBook
Pro.
With the debug patch, the GetCoretextFontList() function gets called 2 times
(cumulative time for that is +/- 0.5 seconds) to launch LibreOffice and display
the Start Center. Then, when I run "--convert-to pdf With-Fonts.odt", the
GetCoretextFontList() function gets called 89 more times and cumulative time in
this function jumps to +/- 19 seconds.
I count only 19 fonts in the With-Fonts.odt file so my first guess is that
LibreOffice's macOS code is unnecessarily reloading all the system fonts. Not
sure where this is happening yet but I will continue to read through the code
and see if I can come up with any idea how to reduce the number of system font
reloads.
Note: below is the debug patch that I used:
diff --git a/vcl/quartz/SystemFontList.cxx b/vcl/quartz/SystemFontList.cxx
index 3ca09bfcf21e..c2a9cf97b1c5 100644
--- a/vcl/quartz/SystemFontList.cxx
+++ b/vcl/quartz/SystemFontList.cxx
@@ -282,12 +282,21 @@ bool SystemFontList::Init()
std::unique_ptr<SystemFontList> GetCoretextFontList()
{
+static unsigned long nCount = 0;
+static long long aTotal;
+auto aStart = std::chrono::high_resolution_clock::now();
+nCount++;
std::unique_ptr<SystemFontList> pList(new SystemFontList());
if( !pList->Init() )
{
- return nullptr;
+ // return nullptr;
+ pList.reset();
}
+auto aEnd = std::chrono::high_resolution_clock::now();
+auto aDeltaTime = aEnd - aStart;
+aTotal +=
std::chrono::duration_cast<std::chrono::milliseconds>(aDeltaTime).count();
+fprintf(stderr, "Total elapsed milliseconds: %lu %lli\n", nCount, aTotal);
return pList;
}
--
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