replace WaveformWidgetFactory::getDevicePixelRatio() with acompatibility solution that consideres the parent widget device pixel ratio with < qt5.6 and above.

1 files changed, 20 insertions, 0 deletions

diff --git a/src/util/compatibility.h b/src/util/compatibility.h
index 9cf12004c8..5216df9a27 100644
--- a/src/util/compatibility.h
+++ b/src/util/compatibility.h
@@ -5,6 +5,8 @@
 #include <QAtomicPointer>
 #include <QStringList>
 #include <QApplication>
+#include <QWindow>
+#include <QWidget>
 
 #include <QLocale>
 #if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
@@ -55,4 +57,22 @@ void qAsConst(const T &&) = delete;
 
 #endif
 
+
+inline qreal getDevicePixelRatioF(const QWidget* widget) {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
+    return widget->devicePixelRatioF();
+#endif
+
+    // Crawl up to the window and return qreal value
+    QWindow* window = widget->window()->windowHandle();
+    if (window) {
+        return window->devicePixelRatio();
+    }
+
+    // return integer value as last resort
+    return widget->devicePixelRatio();
+}
+
+
+
 #endif /* COMPATABILITY_H */