[Kicad-developers] [PATCH] Don't recache items unnecessarily when toggling D-code display

[Jon Evans]

Hi all,

This patch improves the logic for d-code display in GerbView so that there
is now no cost in toggling the codes on or off.  They are still slow to
render in huge files, but at least we only have the hit once when the file
first is loaded.

-Jon

From 1d670987a0a40e0fe339b60ec33546bbcf737a79 Mon Sep 17 00:00:00 2001
From: Jon Evans <j...@craftyjon.com>
Date: Wed, 21 Feb 2018 23:08:59 -0500
Subject: [PATCH 1/2] Don't recache items unnecessarily when toggling D-code
 display

---
 gerbview/gerbview_frame.cpp   | 20 ++++++++++++++++++--
 gerbview/gerbview_painter.cpp |  5 +----
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/gerbview/gerbview_frame.cpp b/gerbview/gerbview_frame.cpp
index 6a4dd1107..72252108a 100644
--- a/gerbview/gerbview_frame.cpp
+++ b/gerbview/gerbview_frame.cpp
@@ -488,9 +488,12 @@ void GERBVIEW_FRAME::ReFillLayerWidget()
 void GERBVIEW_FRAME::SetElementVisibility( GERBVIEW_LAYER_ID aItemIdVisible,
                                            bool aNewState )
 {
+    bool dcodes_changed = false;
+
     switch( aItemIdVisible )
     {
     case LAYER_DCODES:
+        dcodes_changed = m_DisplayOptions.m_DisplayDCodes != aNewState;
         m_DisplayOptions.m_DisplayDCodes = aNewState;
         break;
 
@@ -506,6 +509,19 @@ void GERBVIEW_FRAME::SetElementVisibility( GERBVIEW_LAYER_ID aItemIdVisible,
         wxLogDebug( wxT( "GERBVIEW_FRAME::SetElementVisibility(): bad arg %d" ), aItemIdVisible );
     }
 
+    if( dcodes_changed )
+    {
+        auto view = GetGalCanvas()->GetView();
+
+        for( int i = 0; i < GERBER_DRAWLAYERS_COUNT; i++ )
+        {
+            int layer = GERBER_DRAW_LAYER( i );
+            int dcode_layer = GERBER_DCODE_LAYER( layer );
+            view->SetLayerVisible( dcode_layer,
+                                   aNewState && view->IsLayerVisible( layer ) );
+        }
+    }
+
     applyDisplaySettingsToGAL();
     m_LayersManager->SetRenderState( aItemIdVisible, aNewState );
 }
@@ -520,7 +536,6 @@ void GERBVIEW_FRAME::applyDisplaySettingsToGAL()
 
     settings->ImportLegacyColors( m_colorsSettings );
 
-    view->RecacheAllItems();
     view->MarkTargetDirty( KIGFX::TARGET_NONCACHED );
 }
 
@@ -756,7 +771,8 @@ void GERBVIEW_FRAME::SetVisibleLayers( long aLayerMask )
             bool v = ( aLayerMask & ( 1 << i ) );
             int layer = GERBER_DRAW_LAYER( i );
             canvas->GetView()->SetLayerVisible( layer, v );
-            canvas->GetView()->SetLayerVisible( GERBER_DCODE_LAYER( layer ), v );
+            canvas->GetView()->SetLayerVisible( GERBER_DCODE_LAYER( layer ),
+                                                m_DisplayOptions.m_DisplayDCodes && v );
         }
     }
 }
diff --git a/gerbview/gerbview_painter.cpp b/gerbview/gerbview_painter.cpp
index 486c90a66..ada045a9f 100644
--- a/gerbview/gerbview_painter.cpp
+++ b/gerbview/gerbview_painter.cpp
@@ -189,12 +189,9 @@ void GERBVIEW_PAINTER::draw( /*const*/ GERBER_DRAW_ITEM* aItem, int aLayer )
     // TODO(JE) This doesn't actually work properly for ImageNegative
     bool     isNegative = ( aItem->GetLayerPolarity() ^ aItem->m_GerberImageFile->m_ImageNegative );
 
-    // Draw DCODEs if enabled
+    // Draw DCODE overlay text
     if( IsDCodeLayer( aLayer ) )
     {
-        if( !m_gerbviewSettings.m_showCodes )
-            return;
-
         wxString codeText;
         VECTOR2D textPosition;
         double textSize;
-- 
2.14.1


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