Fix nanovg subwidgets, need viewport scaling

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

dgl/OpenGL.hpp

@@ -232,10 +232,6 @@ public:
     // TODO mark as deprecated
     void drawAt(const Point<int>& pos);
 
-protected:
-   /** @internal */
-//     void _drawAt(const Point<int>& pos) override;
-
 private:
     GLenum fFormat;
     GLenum fType;

dgl/SubWidget.hpp

@@ -124,6 +124,7 @@ private:
     struct PrivateData;
     PrivateData* const pData;
     friend class Widget;
+    template <class BaseWidget> friend class NanoWidget;
     DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(SubWidget)
 };
 

dgl/src/NanoVG.cpp

@@ -963,6 +963,7 @@ NanoWidget<BaseWidget>::NanoWidget(Widget* const parent, int flags)
       NanoVG(flags),
       nData(new PrivateData(this))
 {
+    BaseWidget::pData->viewportNeedsScaling = true;
 }
 
 // TopLevelWidget

dgl/src/OpenGL.cpp

@@ -365,12 +365,11 @@ void SubWidget::PrivateData::display(uint width, uint height, double autoScaling
     {
         // full viewport size
         glViewport(0,
-                    -(height * autoScaling - height),
-                    width * autoScaling,
-                    height * autoScaling);
+                   -(height * autoScaling - height),
+                   width * autoScaling,
+                   height * autoScaling);
     }
-    /*
-    else if (needsScaling)
+    else if (viewportNeedsScaling)
     {
         // limit viewport to widget bounds
         glViewport(absolutePos.getX(),
@@ -378,7 +377,6 @@ void SubWidget::PrivateData::display(uint width, uint height, double autoScaling
                    self->getWidth(),
                    self->getHeight());
     }
-    */
     else
     {
         // only set viewport pos

dgl/src/SubWidgetPrivateData.cpp

@@ -24,7 +24,8 @@ START_NAMESPACE_DGL
 SubWidget::PrivateData::PrivateData(SubWidget* const s, Widget* const pw)
     : self(s),
       parentWidget(pw),
-      absolutePos()
+      absolutePos(),
+      viewportNeedsScaling(false)
 {
     parentWidget->pData->subWidgets.push_back(self);
 }

dgl/src/SubWidgetPrivateData.hpp

@@ -27,6 +27,7 @@ struct SubWidget::PrivateData {
     SubWidget* const self;
     Widget* const parentWidget;
     Point<int> absolutePos;
+    bool viewportNeedsScaling; // needed for NanoVG
 
     explicit PrivateData(SubWidget* const s, Widget* const pw);
     ~PrivateData();