tdf#69060: lock refreshing font data when loading a document

This accumulates all calls to OutputDevice::ImplRefreshAllFontData
while loading document's model, to avoid multiple updates for each
imported font. After loading, OutputDevice::ImplRefreshAllFontData
is executed once.

Change-Id: I5b23a2b8a3765dee9061b6479665d04c2ba11cbf
Reviewed-on: https://gerrit.libreoffice.org/47112
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/vcl/svapp.hxx b/include/vcl/svapp.hxx
index ac1c0ddfb848..712f75a0f09d 100644
--- a/include/vcl/svapp.hxx
+++ b/include/vcl/svapp.hxx
@@ -1365,6 +1365,17 @@ public:
 
     ///@}
 
+    /** Lock font updates for all output devices
+
+     @remark When performing operations that might involve multiple registration of fonts, such as
+        opening/closing documents with multiple embedded fonts, then each font addition/removal
+        might cause an event that initiates a rebuild of each OutputDevice's font lists.
+
+        Locking font updates disables processing such events, and unlocking causes a single such
+        processing for all OutputDevices.
+    */
+    static void LockFontUpdates(bool bLock);
+
     // For vclbootstrapprotector:
     static void setDeInitHook(Link<LinkParamNone*,void> const & hook);