Pcb editor and 3d viewer: fix some issues:

- Fix incorrect values of displayed layers of blind/buried vias
- Fix possible incorrect layer order in PCB_VIA::SanitizeLayers()
- fix some display issues in 3D viewer.
- fix issue in LAYER_RANGE::Contains(): sometimes the test was incorrect.

3d-viewer/3d_canvas/create_layer_items.cpp

@@ -186,8 +186,12 @@ void BOARD_ADAPTER::createLayers( REPORTER* aStatusReporter )
 
     for( PCB_TRACK* track : m_board->Tracks() )
     {
-        if( !Is3dLayerEnabled( track->GetLayer(), visibilityFlags ) ) // Skip non enabled layers
+         // Skip tracks (not vias that are on more than one layer ) on disabled layers
+        if( !track->Type() == PCB_VIA_T
+            && !Is3dLayerEnabled( track->GetLayer(), visibilityFlags ) )
+        {
             continue;
+        }
 
         // Note: a PCB_TRACK holds normal segment tracks and also vias circles (that have also
         // drill values)

include/layer_range.h

@@ -121,16 +121,29 @@ public:
     }
 
     LAYER_RANGE_ITERATOR begin() const { return LAYER_RANGE_ITERATOR( m_start, m_stop, m_layer_count ); }
-    LAYER_RANGE_ITERATOR end() const { auto it = LAYER_RANGE_ITERATOR( m_stop, m_stop, m_layer_count ); return ++it; }
+    LAYER_RANGE_ITERATOR end() const
+    {
+        auto it = LAYER_RANGE_ITERATOR( m_stop, m_stop, m_layer_count );
+        return ++it;
+    }
 
     static bool Contains( int aStart_layer, int aEnd_layer, int aTest_layer )
     {
+        // B_Cu is the lowest copper layer for Z order copper layers
+        // F_cu = top, B_Cu = bottom
+        // So set the distance from top for B_Cu to INT_MAX
+        if( aTest_layer == B_Cu )
+            aTest_layer = INT_MAX;
+
         if( aStart_layer == B_Cu )
             aStart_layer = INT_MAX;
 
         if( aEnd_layer == B_Cu )
             aEnd_layer = INT_MAX;
 
+        if( aStart_layer > aEnd_layer )
+            std::swap( aStart_layer, aEnd_layer );
+
         return aTest_layer >= aStart_layer && aTest_layer <= aEnd_layer;
     }
 

pcbnew/pcb_painter.cpp

@@ -982,8 +982,24 @@ void PCB_PAINTER::draw( const PCB_VIA* aVia, int aLayer )
 
         wxString netname = aVia->GetDisplayNetname();
 
-        int topLayer = aVia->TopLayer() + 1;
+        PCB_LAYER_ID topLayerId = aVia->TopLayer();
-        int bottomLayer = std::min( aVia->BottomLayer() + 1, board->GetCopperLayerCount() );
+        PCB_LAYER_ID bottomLayerId = aVia->BottomLayer();
+        int topLayer;       // The via top layer number (from 1 to copper layer count)
+        int bottomLayer;    // The via bottom layer number (from 1 to copper layer count)
+
+        switch( topLayerId )
+        {
+        case F_Cu: topLayer = 1; break;
+        case B_Cu: topLayer = board->GetCopperLayerCount(); break;
+        default: topLayer = (topLayerId - B_Cu)/2 + 1; break;
+        }
+
+        switch( bottomLayerId )
+        {
+        case F_Cu: bottomLayer = 1; break;
+        case B_Cu: bottomLayer = board->GetCopperLayerCount(); break;
+        default: bottomLayer = (bottomLayerId - B_Cu)/2 + 1; break;
+        }
 
         wxString layerIds;
 #if wxUSE_UNICODE_WCHAR

pcbnew/pcb_track.cpp

@@ -873,7 +873,9 @@ bool PCB_VIA::IsOnLayer( PCB_LAYER_ID aLayer ) const
 #endif
     if( IsCopperLayer( aLayer ) &&
         LAYER_RANGE::Contains( Padstack().Drill().start, Padstack().Drill().end, aLayer ) )
+    {
         return true;
+    }
 
     if( aLayer == F_Mask )
         return !IsTented( F_Mask );
@@ -1013,6 +1015,10 @@ void PCB_VIA::SanitizeLayers()
 
     if( Padstack().Drill().end < Padstack().Drill().start )
         std::swap( Padstack().Drill().end, Padstack().Drill().start );
+
+    // Ensure B_Cu is never the first layer
+    if( Padstack().Drill().start == B_Cu )
+        std::swap( Padstack().Drill().end, Padstack().Drill().start );
 }