Add automaticallyScale argument to UI constructor

Signed-off-by: falkTX <falktx@falktx.com>

distrho/DistrhoUI.hpp

@@ -74,8 +74,13 @@ public:
    /**
       UI class constructor.
       The UI should be initialized to a default state that matches the plugin side.
+
+      When @a automaticallyScale is set to true, DPF will automatically scale up the UI
+      to fit the host/desktop scale factor.@n
+      It assumes aspect ratio is meant to be kept.
+      Manually call setGeometryConstraints instead if keeping UI aspect ratio is not required.
     */
-    UI(uint width = 0, uint height = 0);
+    UI(uint width = 0, uint height = 0, bool automaticallyScale = false);
 
    /**
       Destructor.

distrho/src/DistrhoUI.cpp

@@ -46,13 +46,18 @@ PluginWindow& UI::PrivateData::createNextWindow(UI* const ui, const uint width,
 /* ------------------------------------------------------------------------------------------------------------
  * UI */
 
-UI::UI(const uint width, const uint height)
+UI::UI(const uint width, const uint height, const bool automaticallyScale)
     : UIWidget(UI::PrivateData::createNextWindow(this, width, height)),
       uiData(UI::PrivateData::s_nextPrivateData)
 {
 #if !DISTRHO_PLUGIN_HAS_EXTERNAL_UI
     if (width > 0 && height > 0)
+    {
         Widget::setSize(width, height);
+
+        if (automaticallyScale)
+            setGeometryConstraints(width, height, true, true);
+    }
 #endif
 }