Make QFontDatabase member functions static

QFontDatabase is a singleton and all instances would share
a single, mutex-protected global data pointer. But some functions
were implemented as non-static functions. This caused a lot
of code on the form

	QFontDatabase().families(...)

since there was no static access. Other functions were implemented
as static.

To consolidate, we make all functions static. This should be
source-compatible, but not binary compatible.

[ChangeLog][QtGui][Fonts] Some functions in QFontDatabase were in
principle static, but previously not implemented as such. All
member functions have now been made static, so that constructing
objects of QFontDatabase is no longer necessary to access certain
functionality.

Fixes: QTBUG-83284
Change-Id: Ifd8c15016281c71f631b53387402c942cd9c43f6
Reviewed-by: Konstantin Ritt <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/manual/textrendering/textperformance/main.cpp b/tests/manual/textrendering/textperformance/main.cpp
index 8fb3a3c4a27..9d238ad4204 100644
--- a/tests/manual/textrendering/textperformance/main.cpp
+++ b/tests/manual/textrendering/textperformance/main.cpp
@@ -152,7 +152,7 @@ public:
     {
         static QStringList samples;
         if (samples.isEmpty()) {
-            foreach (const QFontDatabase::WritingSystem system, QFontDatabase().writingSystems())
+            foreach (const QFontDatabase::WritingSystem system, QFontDatabase::writingSystems())
                 if (system != QFontDatabase::Ogham && system != QFontDatabase::Runic)
                     samples.append(QFontDatabase::writingSystemSample(system));
         }