Render transparent layer colors over the correct background.

This fixes the layer comboboxes, the copper zones properties
dialog, and the differental-pair icon in the htoolbar.

Fixes: lp:1741049
* https://bugs.launchpad.net/kicad/+bug/1741049

common/class_layer_box_selector.cpp

@@ -54,11 +54,20 @@ void LAYER_SELECTOR::SetBitmapLayer( wxBitmap& aLayerbmp, LAYER_NUM aLayer )
 
     // Prepare Bitmap
     bmpDC.SelectObject( aLayerbmp );
-    brush.SetColour( GetLayerColor( aLayer ).ToColour() );
-    brush.SetStyle( wxBRUSHSTYLE_SOLID );
 
+    brush.SetStyle( wxBRUSHSTYLE_SOLID );
+    COLOR4D backgroundColor = GetLayerColor( LAYER_PCB_BACKGROUND );
+    if( backgroundColor != COLOR4D::UNSPECIFIED )
+    {
+        brush.SetColour( backgroundColor.WithAlpha(1.0).ToColour() );
+        bmpDC.SetBrush( brush );
+        bmpDC.DrawRectangle( 0, 0, aLayerbmp.GetWidth(), aLayerbmp.GetHeight() );
+    }
+
+    brush.SetColour( GetLayerColor( aLayer ).ToColour() );
     bmpDC.SetBrush( brush );
     bmpDC.DrawRectangle( 0, 0, aLayerbmp.GetWidth(), aLayerbmp.GetHeight() );
+
     bmpDC.SetBrush( *wxTRANSPARENT_BRUSH );
     bmpDC.SetPen( *wxBLACK_PEN );
     bmpDC.DrawRectangle( 0, 0, aLayerbmp.GetWidth(), aLayerbmp.GetHeight() );

common/lset.cpp

@@ -795,7 +795,7 @@ LSEQ LSET::UIOrder() const
 
 PCB_LAYER_ID ToLAYER_ID( int aLayer )
 {
-    wxASSERT( unsigned( aLayer ) < PCB_LAYER_ID_COUNT );
+    wxASSERT( unsigned( aLayer ) < GAL_LAYER_ID_END );
     return PCB_LAYER_ID( aLayer );
 }
 

pcbnew/class_pcb_layer_widget.cpp

@@ -555,6 +555,8 @@ void PCB_LAYER_WIDGET::OnLayerColorChange( int aLayer, COLOR4D aColor )
         view->UpdateLayerColor( GetNetnameLayer( aLayer ) );
     }
 
+    myframe->ReCreateHToolbar();
+
     myframe->GetCanvas()->Refresh();
 }
 
@@ -648,6 +650,8 @@ void PCB_LAYER_WIDGET::OnRenderColorChange( int aId, COLOR4D aColor )
         galCanvas->ForceRefresh();
     }
 
+    myframe->ReCreateHToolbar();
+
     myframe->GetCanvas()->Refresh();
 }
 

pcbnew/dialogs/dialog_copper_zones.cpp

@@ -115,8 +115,9 @@ private:
      * Function makeLayerBitmap
      * creates the colored rectangle bitmaps used in the layer selection widget.
      * @param aColor is the color to fill the rectangle with.
+     * @param aBackground is the background color in case aColor is transparent.
      */
-    wxBitmap makeLayerBitmap( COLOR4D aColor );
+    wxBitmap makeLayerBitmap( COLOR4D aColor, COLOR4D aBackground );
 };
 
 
@@ -244,6 +245,7 @@ void DIALOG_COPPER_ZONE::initDialog()
 
     LSET cu_set = LSET::AllCuMask( board->GetCopperLayerCount() );
 
+    COLOR4D backgroundColor = m_Parent->Settings().Colors().GetLayerColor( LAYER_PCB_BACKGROUND );
     for( LSEQ cu_stack = cu_set.UIOrder();  cu_stack;  ++cu_stack, imgIdx++ )
     {
         PCB_LAYER_ID layer = *cu_stack;
@@ -256,7 +258,7 @@ void DIALOG_COPPER_ZONE::initDialog()
 
         COLOR4D layerColor = m_Parent->Settings().Colors().GetLayerColor( layer );
 
-        imageList->Add( makeLayerBitmap( layerColor ) );
+        imageList->Add( makeLayerBitmap( layerColor, backgroundColor ) );
 
         int itemIndex = m_LayerSelectionCtrl->InsertItem(
                 m_LayerSelectionCtrl->GetItemCount(), msg, imgIdx );
@@ -682,15 +684,20 @@ void DIALOG_COPPER_ZONE::buildAvailableListOfNets()
 }
 
 
-wxBitmap DIALOG_COPPER_ZONE::makeLayerBitmap( COLOR4D aColor )
+wxBitmap DIALOG_COPPER_ZONE::makeLayerBitmap( COLOR4D aColor, COLOR4D aBackground )
 {
     wxBitmap    bitmap( LAYER_BITMAP_SIZE_X, LAYER_BITMAP_SIZE_Y );
     wxBrush     brush;
     wxMemoryDC  iconDC;
 
     iconDC.SelectObject( bitmap );
-    brush.SetColour( aColor.ToColour() );
+
     brush.SetStyle( wxBRUSHSTYLE_SOLID );
+    brush.SetColour( aBackground.WithAlpha(1.0).ToColour() );
+    iconDC.SetBrush( brush );
+    iconDC.DrawRectangle( 0, 0, LAYER_BITMAP_SIZE_X, LAYER_BITMAP_SIZE_Y );
+
+    brush.SetColour( aColor.ToColour() );
     iconDC.SetBrush( brush );
     iconDC.DrawRectangle( 0, 0, LAYER_BITMAP_SIZE_X, LAYER_BITMAP_SIZE_Y );
 

pcbnew/tool_pcb.cpp

@@ -94,12 +94,13 @@ void PCB_EDIT_FRAME::PrepareLayerIndicator()
 {
     int        ii, jj;
     COLOR4D    active_layer_color, Route_Layer_TOP_color,
-               Route_Layer_BOTTOM_color, via_color;
+               Route_Layer_BOTTOM_color, via_color, background_color;
     bool       change = false;
 
     static int previous_requested_scale;
     static COLOR4D previous_active_layer_color, previous_Route_Layer_TOP_color,
-                   previous_Route_Layer_BOTTOM_color, previous_via_color;
+                   previous_Route_Layer_BOTTOM_color, previous_via_color,
+                   previous_background_color;
 
     const int  requested_scale = GetIconScale();
 
@@ -144,6 +145,14 @@ void PCB_EDIT_FRAME::PrepareLayerIndicator()
         change = true;
     }
 
+    background_color = Settings().Colors().GetItemColor( LAYER_PCB_BACKGROUND );
+
+    if( previous_background_color != background_color )
+    {
+        previous_background_color = background_color;
+        change = true;
+    }
+
     if( !change && LayerPairBitmap )
         return;
 
@@ -154,9 +163,15 @@ void PCB_EDIT_FRAME::PrepareLayerIndicator()
      */
     wxMemoryDC iconDC;
     iconDC.SelectObject( *LayerPairBitmap );
+    wxBrush    brush;
     wxPen      pen;
     int buttonColor = -1;
 
+    brush.SetStyle( wxBRUSHSTYLE_SOLID );
+    brush.SetColour( background_color.WithAlpha(1.0).ToColour() );
+    iconDC.SetBrush( brush );
+    iconDC.DrawRectangle( 0, 0, BM_LAYERICON_SIZE, BM_LAYERICON_SIZE );
+
     for( ii = 0; ii < BM_LAYERICON_SIZE; ii++ )
     {
         for( jj = 0; jj < BM_LAYERICON_SIZE; jj++ )