5 files changed, 26 insertions, 16 deletions
diff --git a/compat/qt-dpi.hpp b/compat/qt-dpi.hpp
new file mode 100644
index 00000000..01659c8a
--- /dev/null
+++ b/compat/qt-dpi.hpp
@@ -0,0 +1,19 @@
+#pragma once
+
+#include <algorithm>
+#include <QWidget>
+
+template<typename self>
+struct screen_dpi_mixin
+{
+protected:
+    double screen_dpi() const
+    {
+        const auto& x = *static_cast<const self*>(this);
+#ifdef _WIN32
+        return std::max(x.devicePixelRatioF(), 1.);
+#else
+        return std::max(std::max(x.logicalDpiX()/(double)x.physicalDpiX(), x.devicePixelRatioF()), 1.);
+#endif
+    }
+};
diff --git a/spline/spline-widget.cpp b/spline/spline-widget.cpp
index 0ae3766d..e182e45a 100644
--- a/spline/spline-widget.cpp
+++ b/spline/spline-widget.cpp
@@ -258,15 +258,6 @@ void spline_widget::drawFunction()
     }
 }
 
-double spline_widget::screen_dpi() const
-{
-#ifdef _WIN32
-    return std::max(devicePixelRatioF(), 1.);
-#else
-    return std::max(std::max(logicalDpiX()/(double)physicalDpiX(), devicePixelRatioF()), 1.);
-#endif
-}
-
 QSize spline_widget::minimumSizeHint() const
 {
     const double dpi = screen_dpi();
diff --git a/spline/spline-widget.hpp b/spline/spline-widget.hpp
index f1523361..610baf43 100644
--- a/spline/spline-widget.hpp
+++ b/spline/spline-widget.hpp
@@ -11,6 +11,7 @@
 
 #include "spline.hpp"
 #include "api/plugin-api.hpp"
+#include "compat/qt-dpi.hpp"
 #include "options/options.hpp"
 
 #include "export.hpp"
@@ -26,7 +27,7 @@ namespace spline_detail {
 
 using namespace options;
 
-class OTR_SPLINE_EXPORT spline_widget final : public QWidget
+class OTR_SPLINE_EXPORT spline_widget final : public QWidget, public screen_dpi_mixin<spline_widget>
 {
     Q_OBJECT
     Q_PROPERTY(QColor colorBezier READ colorBezier WRITE setColorBezier)
@@ -81,8 +82,6 @@ private:
     void update_range();
     void changeEvent(QEvent* e) override;
 
-    double screen_dpi() const;
-
     QPointF pixel_to_point(const QPointF& point);
     QPointF point_to_pixel(const QPointF& point);
 
diff --git a/video/video-widget.cpp b/video/video-widget.cpp
index 9100e0ea..8262a380 100644
--- a/video/video-widget.cpp
+++ b/video/video-widget.cpp
@@ -11,9 +11,8 @@
 
 void video_widget::init_image_nolock()
 {
-    double dpr = devicePixelRatioF();
-    size_.store({ iround(width() * dpr), iround(height() * dpr) },
-                std::memory_order_release);
+    double dpi = screen_dpi();
+    size_.store({ iround(width() * dpi), iround(height() * dpi) }, std::memory_order_release);
 }
 
 video_widget::video_widget(QWidget* parent) : QWidget(parent)
@@ -85,3 +84,4 @@ void video_widget::set_fresh(bool x)
 {
     fresh_.store(x, std::memory_order_release);
 }
+
diff --git a/video/video-widget.hpp b/video/video-widget.hpp
index bb218c69..9218643b 100644
--- a/video/video-widget.hpp
+++ b/video/video-widget.hpp
@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include "compat/qt-dpi.hpp"
 #include "compat/math.hpp"
 #include "export.hpp"
 
@@ -20,7 +21,7 @@
 
 #include <QMutex>
 
-struct OTR_VIDEO_EXPORT video_widget : QWidget
+struct OTR_VIDEO_EXPORT video_widget : QWidget, public screen_dpi_mixin<video_widget>
 {
     video_widget(QWidget* parent = nullptr);