Expose SubWidget::setNeedsViewportScaling and use it in NanoWidget

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

dgl/SubWidget.hpp

@@ -126,6 +126,11 @@ public:
     */
     void setNeedsFullViewportDrawing(bool needsFullViewportForDrawing = true);
 
+   /**
+      Indicate that this subwidget will always draw at its own internal size and needs scaling to fit target size.
+    */
+    void setNeedsViewportScaling(bool needsViewportScaling = true);
+
    /**
       Indicate that this subwidget should not be drawn on screen, typically because it is managed by something else.
     */
@@ -141,7 +146,6 @@ private:
     struct PrivateData;
     PrivateData* const pData;
     friend class Widget;
-    template <class BaseWidget> friend class NanoBaseWidget;
     DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(SubWidget)
 };
 

dgl/src/NanoVG.cpp

@@ -945,7 +945,7 @@ NanoBaseWidget<SubWidget>::NanoBaseWidget(Widget* const parent, int flags)
     : SubWidget(parent),
       NanoVG(flags)
 {
-    pData->needsViewportScaling = true;
+    setNeedsViewportScaling();
 }
 
 template class NanoBaseWidget<SubWidget>;

dgl/src/SubWidget.cpp

@@ -123,6 +123,11 @@ void SubWidget::setNeedsFullViewportDrawing(const bool needsFullViewportForDrawi
     pData->needsFullViewportForDrawing = needsFullViewportForDrawing;
 }
 
+void SubWidget::setNeedsViewportScaling(const bool needsViewportScaling)
+{
+    pData->needsViewportScaling = needsViewportScaling;
+}
+
 void SubWidget::setSkipDrawing(const bool skipDrawing)
 {
     pData->skipDrawing = skipDrawing;