Add debug operators for font database structs for easier debugging

Change-Id: Ice1b27ff93de2d369dc6b66c72a64eb05da5639c
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

2 files changed, 28 insertions, 0 deletions

diff --git a/src/gui/text/qplatformfontdatabase.cpp b/src/gui/text/qplatformfontdatabase.cpp
index 599b18ac05..4ad826e87b 100644
--- a/src/gui/text/qplatformfontdatabase.cpp
+++ b/src/gui/text/qplatformfontdatabase.cpp
@@ -45,6 +45,7 @@
 #include <qpa/qplatformscreen.h>
 #include <QtCore/QLibraryInfo>
 #include <QtCore/QDir>
+#include <QtCore/QMetaEnum>
 
 #include <algorithm>
 #include <iterator>
@@ -201,6 +202,26 @@ QSupportedWritingSystems &QSupportedWritingSystems::operator=(const QSupportedWr
     return *this;
 }
 
+#ifndef QT_NO_DEBUG_STREAM
+QDebug operator<<(QDebug debug, const QSupportedWritingSystems &sws)
+{
+    QMetaObject mo = QFontDatabase::staticMetaObject;
+    QMetaEnum me = mo.enumerator(mo.indexOfEnumerator("WritingSystem"));
+
+    QDebugStateSaver saver(debug);
+    debug.nospace() << "QSupportedWritingSystems(";
+    int i = sws.d->vector.indexOf(true);
+    while (i > 0) {
+        debug << me.valueToKey(i);
+        i = sws.d->vector.indexOf(true, i + 1);
+        if (i > 0)
+            debug << ", ";
+    }
+    debug << ")";
+    return debug;
+}
+#endif
+
 /*!
     Destroys the supported writing systems object.
 */
diff --git a/src/gui/text/qplatformfontdatabase.h b/src/gui/text/qplatformfontdatabase.h
index 2d99183ca3..2ca783f0fd 100644
--- a/src/gui/text/qplatformfontdatabase.h
+++ b/src/gui/text/qplatformfontdatabase.h
@@ -84,11 +84,18 @@ private:
 
     friend Q_GUI_EXPORT bool operator==(const QSupportedWritingSystems &, const QSupportedWritingSystems &);
     friend Q_GUI_EXPORT bool operator!=(const QSupportedWritingSystems &, const QSupportedWritingSystems &);
+#ifndef QT_NO_DEBUG_STREAM
+    friend Q_GUI_EXPORT QDebug operator<<(QDebug, const QSupportedWritingSystems &);
+#endif
 };
 
 Q_GUI_EXPORT bool operator==(const QSupportedWritingSystems &, const QSupportedWritingSystems &);
 Q_GUI_EXPORT bool operator!=(const QSupportedWritingSystems &, const QSupportedWritingSystems &);
 
+#ifndef QT_NO_DEBUG_STREAM
+Q_GUI_EXPORT QDebug operator<<(QDebug, const QSupportedWritingSystems &);
+#endif
+
 class QFontRequestPrivate;
 class QFontEngineMulti;