board_stackup.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2019 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
 
#include "board_stackup.h"
#include <base_units.h>
#include <string_utils.h>
#include <layer_ids.h>
#include <board_design_settings.h>
#include <board.h>
#include <i18n_utility.h>       // For _HKI definition
#include <io/kicad/kicad_io_utils.h>
#include "stackup_predefined_prms.h"
#include <richio.h>
#include <google/protobuf/any.pb.h>
#include <api/board/board.pb.h>
#include <api/api_enums.h>
 
 
bool DIELECTRIC_PRMS::operator==( const DIELECTRIC_PRMS& aOther ) const
{
    if( m_Material        != aOther.m_Material ) return false;
    if( m_Thickness       != aOther.m_Thickness ) return false;
    if( m_ThicknessLocked != aOther.m_ThicknessLocked ) return false;
    if( m_EpsilonR        != aOther.m_EpsilonR ) return false;
    if( m_LossTangent     != aOther.m_LossTangent ) return false;
    if( m_Color           != aOther.m_Color ) return false;
 
    return true;
}
 
 
BOARD_STACKUP_ITEM::BOARD_STACKUP_ITEM( BOARD_STACKUP_ITEM_TYPE aType )
{
    DIELECTRIC_PRMS item_prms;
    m_DielectricPrmsList.emplace_back( item_prms );
    m_LayerId = UNDEFINED_LAYER;
    m_Type = aType;
    SetDielectricLayerId( 1 );
    SetEnabled( true );
 
    // Initialize parameters to a usual value for allowed types:
    switch( m_Type )
    {
    case BS_ITEM_TYPE_COPPER:
        m_TypeName = KEY_COPPER;
        SetThickness( GetCopperDefaultThickness() );
        break;
 
    case BS_ITEM_TYPE_DIELECTRIC:
        m_TypeName = KEY_CORE;          // or prepreg
        SetColor( NotSpecifiedPrm() );
        SetMaterial( wxT( "FR4" ) );    // or other dielectric name
        SetLossTangent( 0.02 ); // for FR4
        SetEpsilonR( 4.5 );         // for FR4
        SetSpecFreq( 1e9 );         // for FR4
        SetDielectricModel( DIELECTRIC_MODEL::CONSTANT );
        break;
 
    case BS_ITEM_TYPE_SOLDERPASTE:
        m_TypeName = wxT( "solderpaste" );
        break;
 
    case BS_ITEM_TYPE_SOLDERMASK:
        m_TypeName = wxT( "soldermask" );
        SetColor( NotSpecifiedPrm() );
        SetMaterial( NotSpecifiedPrm() ); // or other solder mask material name
        SetThickness( GetMaskDefaultThickness() );
        SetEpsilonR( DEFAULT_EPSILON_R_SOLDERMASK );
        break;
 
    case BS_ITEM_TYPE_SILKSCREEN:
        m_TypeName = wxT( "silkscreen" );
        SetColor( NotSpecifiedPrm() );
        SetMaterial( NotSpecifiedPrm() ); // or other silkscreen material name
        SetEpsilonR( DEFAULT_EPSILON_R_SILKSCREEN );
        break;
 
    case BS_ITEM_TYPE_UNDEFINED:
        break;
    }
}
 
 
BOARD_STACKUP_ITEM::BOARD_STACKUP_ITEM( const BOARD_STACKUP_ITEM& aOther )
{
    m_LayerId = aOther.m_LayerId;
    m_DielectricLayerId = aOther.m_DielectricLayerId;
    m_Type = aOther.m_Type;
    m_enabled = aOther.m_enabled;
    m_DielectricPrmsList = aOther.m_DielectricPrmsList;
    m_TypeName = aOther.m_TypeName;
    m_LayerName = aOther.m_LayerName;
}
 
 
bool BOARD_STACKUP_ITEM::operator==( const BOARD_STACKUP_ITEM& aOther ) const
{
    if( m_Type              != aOther.m_Type ) return false;
    if( m_LayerName         != aOther.m_LayerName ) return false;
    if( m_TypeName          != aOther.m_TypeName ) return false;
    if( m_LayerId           != aOther.m_LayerId ) return false;
    if( m_DielectricLayerId != aOther.m_DielectricLayerId ) return false;
    if( m_enabled           != aOther.m_enabled ) return false;
 
    if( !std::equal( std::begin( m_DielectricPrmsList ), std::end( m_DielectricPrmsList ),
                     std::begin( aOther.m_DielectricPrmsList ),
                     []( const DIELECTRIC_PRMS& aA, const DIELECTRIC_PRMS& aB )
                     {
                         return aA == aB;
                     } ) )
    {
        return false;
    }
 
    return true;
}
 
 
void BOARD_STACKUP_ITEM::AddDielectricPrms( int aDielectricPrmsIdx )
{
    // add a DIELECTRIC_PRMS item to m_DielectricPrmsList
    DIELECTRIC_PRMS new_prms;
 
    m_DielectricPrmsList.emplace( m_DielectricPrmsList.begin() + aDielectricPrmsIdx, new_prms );
}
 
 
void BOARD_STACKUP_ITEM::RemoveDielectricPrms( int aDielectricPrmsIdx )
{
    // Remove a DIELECTRIC_PRMS item from m_DielectricPrmsList if possible
 
    if( GetSublayersCount() < 2
            || aDielectricPrmsIdx < 0
            || aDielectricPrmsIdx >= GetSublayersCount() )
    {
        return;
    }
 
    m_DielectricPrmsList.erase( m_DielectricPrmsList.begin() + aDielectricPrmsIdx );
}
 
 
 
int BOARD_STACKUP_ITEM::GetCopperDefaultThickness()
{
    // A reasonable thickness for copper layers:
    return pcbIUScale.mmToIU( 0.035 );
}
 
 
int BOARD_STACKUP_ITEM::GetMaskDefaultThickness()
{
    // A reasonable thickness for solder mask:
    return pcbIUScale.mmToIU( 0.01 );
}
 
 
// Getters:
wxString BOARD_STACKUP_ITEM::GetColor( int aDielectricSubLayer ) const
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    return m_DielectricPrmsList[aDielectricSubLayer].m_Color;
}
 
int BOARD_STACKUP_ITEM::GetThickness( int aDielectricSubLayer ) const
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    return m_DielectricPrmsList[aDielectricSubLayer].m_Thickness;
}
 
 
double BOARD_STACKUP_ITEM::GetLossTangent( int aDielectricSubLayer ) const
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    return m_DielectricPrmsList[aDielectricSubLayer].m_LossTangent;
}
 
 
double BOARD_STACKUP_ITEM::GetSpecFreq( int aDielectricSubLayer ) const
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    return m_DielectricPrmsList[aDielectricSubLayer].m_SpecFreq;
}
 
 
DIELECTRIC_MODEL BOARD_STACKUP_ITEM::GetDielectricModel( int aDielectricSubLayer ) const
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    return m_DielectricPrmsList[aDielectricSubLayer].m_DielectricModel;
}
 
 
double BOARD_STACKUP_ITEM::GetEpsilonR( int aDielectricSubLayer ) const
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    return m_DielectricPrmsList[aDielectricSubLayer].m_EpsilonR;
}
 
 
bool BOARD_STACKUP_ITEM::IsThicknessLocked( int aDielectricSubLayer ) const
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    return m_DielectricPrmsList[aDielectricSubLayer].m_ThicknessLocked;
}
 
 
wxString BOARD_STACKUP_ITEM::GetMaterial( int aDielectricSubLayer ) const
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    return m_DielectricPrmsList[aDielectricSubLayer].m_Material;
}
 
 
// Setters:
void BOARD_STACKUP_ITEM::SetColor(  const wxString& aColorName , int aDielectricSubLayer )
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    if( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() )
        m_DielectricPrmsList[aDielectricSubLayer].m_Color = aColorName;
}
 
 
void BOARD_STACKUP_ITEM::SetThickness( int aThickness, int aDielectricSubLayer )
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    if( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() )
        m_DielectricPrmsList[aDielectricSubLayer].m_Thickness = aThickness;
}
 
 
void BOARD_STACKUP_ITEM::SetLossTangent( double aTg, int aDielectricSubLayer )
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    if( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() )
        m_DielectricPrmsList[aDielectricSubLayer].m_LossTangent = aTg;
}
 
 
void BOARD_STACKUP_ITEM::SetSpecFreq( const double aSpecFreq, const int aDielectricSubLayer )
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    if( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() )
        m_DielectricPrmsList[aDielectricSubLayer].m_SpecFreq = aSpecFreq;
}
 
 
void BOARD_STACKUP_ITEM::SetDielectricModel( DIELECTRIC_MODEL aModel, int aDielectricSubLayer )
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    if( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() )
        m_DielectricPrmsList[aDielectricSubLayer].m_DielectricModel = aModel;
}
 
 
void BOARD_STACKUP_ITEM::SetEpsilonR( double aEpsilon, int aDielectricSubLayer )
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    if( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() )
        m_DielectricPrmsList[aDielectricSubLayer].m_EpsilonR = aEpsilon;
}
 
 
void BOARD_STACKUP_ITEM::SetThicknessLocked( bool aLocked, int aDielectricSubLayer )
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    if( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() )
        m_DielectricPrmsList[aDielectricSubLayer].m_ThicknessLocked = aLocked;
}
 
 
void BOARD_STACKUP_ITEM::SetMaterial( const wxString& aName, int aDielectricSubLayer )
{
    wxASSERT( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() );
 
    if( aDielectricSubLayer >= 0 && aDielectricSubLayer < GetSublayersCount() )
        m_DielectricPrmsList[aDielectricSubLayer].m_Material = aName;
}
 
 
bool BOARD_STACKUP_ITEM::HasEpsilonRValue() const
{
    return m_Type == BS_ITEM_TYPE_DIELECTRIC
            || m_Type == BS_ITEM_TYPE_SOLDERMASK;
};
 
 
bool BOARD_STACKUP_ITEM::HasLossTangentValue() const
{
    return m_Type == BS_ITEM_TYPE_DIELECTRIC
            || m_Type == BS_ITEM_TYPE_SOLDERMASK;
};
 
 
bool BOARD_STACKUP_ITEM::HasSpecFreqValue() const
{
    return m_Type == BS_ITEM_TYPE_DIELECTRIC;
}
 
 
bool BOARD_STACKUP_ITEM::HasMaterialValue( int aDielectricSubLayer ) const
{
    // return true if the material is specified
    return IsMaterialEditable() && IsPrmSpecified( GetMaterial( aDielectricSubLayer ) );
}
 
 
bool BOARD_STACKUP_ITEM::IsMaterialEditable() const
{
    return m_Type == BS_ITEM_TYPE_DIELECTRIC
            || m_Type == BS_ITEM_TYPE_SOLDERMASK
            || m_Type == BS_ITEM_TYPE_SILKSCREEN;
}
 
 
bool BOARD_STACKUP_ITEM::IsColorEditable() const
{
    return m_Type == BS_ITEM_TYPE_DIELECTRIC
            || m_Type == BS_ITEM_TYPE_SOLDERMASK
            || m_Type == BS_ITEM_TYPE_SILKSCREEN;
}
 
 
bool BOARD_STACKUP_ITEM::IsThicknessEditable() const
{
    return m_Type == BS_ITEM_TYPE_COPPER
            || m_Type == BS_ITEM_TYPE_DIELECTRIC
            || m_Type == BS_ITEM_TYPE_SOLDERMASK;
}
 
 
wxString BOARD_STACKUP_ITEM::FormatEpsilonR( int aDielectricSubLayer ) const
{
    // return a wxString to print/display Epsilon R
    // note: we do not want scientific notation
    wxString txt = UIDouble2Str( GetEpsilonR( aDielectricSubLayer ) );
    return txt;
}
 
 
wxString BOARD_STACKUP_ITEM::FormatLossTangent( int aDielectricSubLayer ) const
{
    // return a wxString to print/display Loss Tangent
    // note: we do not want scientific notation
    wxString txt = UIDouble2Str( GetLossTangent( aDielectricSubLayer ) );
    return txt;
}
 
 
wxString BOARD_STACKUP_ITEM::FormatDielectricLayerName() const
{
    // return a wxString to print/display a dielectric name
    wxString lname;
    lname.Printf( _( "Dielectric %d" ), GetDielectricLayerId() );
 
    return lname;
}
 
 
BOARD_STACKUP::BOARD_STACKUP()
{
    m_HasDielectricConstrains = false;  // True if some dielectric layers have constrains
                                        // (Loss tg and Epison R)
    m_HasThicknessConstrains = false;   // True if some dielectric or copper layers have constrains
    m_EdgeConnectorConstraints = BS_EDGE_CONNECTOR_NONE;
    m_EdgePlating = false;              // True if edge board is plated
    m_FinishType = wxT( "None" );       // undefined finish type
}
 
 
BOARD_STACKUP::BOARD_STACKUP( const BOARD_STACKUP& aOther )
{
    m_HasDielectricConstrains  = aOther.m_HasDielectricConstrains;
    m_HasThicknessConstrains   = aOther.m_HasThicknessConstrains;
    m_EdgeConnectorConstraints = aOther.m_EdgeConnectorConstraints;
    m_EdgePlating              = aOther.m_EdgePlating;
    m_FinishType               = aOther.m_FinishType;
 
    // All items in aOther.m_list have to be duplicated, because aOther.m_list
    // manage pointers to these items
    for( BOARD_STACKUP_ITEM* item : aOther.m_list )
    {
        BOARD_STACKUP_ITEM* dup_item = new BOARD_STACKUP_ITEM( *item );
        Add( dup_item );
    }
}
 
 
BOARD_STACKUP& BOARD_STACKUP::operator=( const BOARD_STACKUP& aOther )
{
    m_HasDielectricConstrains  = aOther.m_HasDielectricConstrains;
    m_HasThicknessConstrains   = aOther.m_HasThicknessConstrains;
    m_EdgeConnectorConstraints = aOther.m_EdgeConnectorConstraints;
    m_EdgePlating              = aOther.m_EdgePlating;
    m_FinishType               = aOther.m_FinishType;
 
    RemoveAll();
 
    // All items in aOther.m_list have to be duplicated, because aOther.m_list
    // manage pointers to these items
    for( BOARD_STACKUP_ITEM* item : aOther.m_list )
    {
        BOARD_STACKUP_ITEM* dup_item = new BOARD_STACKUP_ITEM( *item );
        Add( dup_item );
    }
 
    return *this;
}
 
 
bool BOARD_STACKUP::operator==( const BOARD_STACKUP& aOther ) const
{
    if( m_HasDielectricConstrains  != aOther.m_HasDielectricConstrains ) return false;
    if( m_HasThicknessConstrains   != aOther.m_HasThicknessConstrains ) return false;
    if( m_EdgeConnectorConstraints != aOther.m_EdgeConnectorConstraints ) return false;
    if( m_EdgePlating              != aOther.m_EdgePlating ) return false;
    if( m_FinishType               != aOther.m_FinishType ) return false;
 
    if( m_list.size() != aOther.m_list.size() )
        return false;
 
    if( !std::equal( std::begin( m_list ), std::end( m_list ), std::begin( aOther.m_list ),
                     []( const BOARD_STACKUP_ITEM* aA, const BOARD_STACKUP_ITEM* aB )
                     {
                         return *aA == *aB;
                     } ) )
    {
        return false;
    }
 
    return true;
}
 
 
void BOARD_STACKUP::Serialize( google::protobuf::Any& aContainer ) const
{
    using namespace kiapi::board;
    BoardStackup stackup;
 
    for( const BOARD_STACKUP_ITEM* item : m_list )
    {
        BoardStackupLayer* layer = stackup.mutable_layers()->Add();
 
        layer->mutable_thickness()->set_value_nm( item->GetThickness() );
        layer->set_layer( ToProtoEnum<PCB_LAYER_ID, types::BoardLayer>( item->GetBrdLayerId() ) );
        layer->set_type(
                ToProtoEnum<BOARD_STACKUP_ITEM_TYPE, BoardStackupLayerType>( item->GetType() ) );
 
        switch( item->GetType() )
        {
        case BS_ITEM_TYPE_COPPER:
        {
            layer->set_material_name( "copper" );
            // (no copper params yet...)
            break;
        }
 
        case BS_ITEM_TYPE_DIELECTRIC:
        {
            BoardStackupDielectricLayer* dielectric = layer->mutable_dielectric()->New();
 
            for( int i = 0; i < item->GetSublayersCount(); ++i )
            {
                BoardStackupDielectricProperties* props = dielectric->mutable_layer()->Add();
                props->set_epsilon_r( item->GetEpsilonR( i ) );
                props->set_loss_tangent( item->GetLossTangent( i ) );
                props->set_material_name( item->GetMaterial( i ).ToUTF8() );
                props->mutable_thickness()->set_value_nm( item->GetThickness( i ) );
            }
 
            break;
        }
 
        default:
            break;
        }
    }
 
    aContainer.PackFrom( stackup );
}
 
 
bool BOARD_STACKUP::Deserialize( const google::protobuf::Any& aContainer )
{
    // Read-only for now
    return false;
}
 
 
void BOARD_STACKUP::RemoveAll()
{
    for( BOARD_STACKUP_ITEM* item : m_list )
        delete item;
 
    m_list.clear();
}
 
 
BOARD_STACKUP_ITEM* BOARD_STACKUP::GetStackupLayer( int aIndex )
{
    if( aIndex < 0 || aIndex >= GetCount() )
        return nullptr;
 
    return GetList()[aIndex];
}
 
 
int BOARD_STACKUP::BuildBoardThicknessFromStackup() const
{
    // return the board thickness from the thickness of BOARD_STACKUP_ITEM list
    int thickness = 0;
 
    for( BOARD_STACKUP_ITEM* item : m_list )
    {
        if( item->IsThicknessEditable() && item->IsEnabled() )
        {
            thickness += item->GetThickness();
 
            // dielectric layers can have more than one main layer
            // add thickness of all sublayers
            for( int idx = 1; idx < item->GetSublayersCount(); idx++ )
            {
                thickness += item->GetThickness( idx );
            }
        }
    }
 
    return thickness;
}
 
 
bool BOARD_STACKUP::SynchronizeWithBoard( BOARD_DESIGN_SETTINGS* aSettings )
{
    bool change = false;
    // Build the suitable stackup:
    BOARD_STACKUP stackup;
    stackup.BuildDefaultStackupList( aSettings );
 
    // First, find removed layers:
    for( BOARD_STACKUP_ITEM* curr_item: m_list )
    {
        bool found = false;
 
        for( BOARD_STACKUP_ITEM* item: stackup.GetList() )
        {
            if( curr_item->GetBrdLayerId() != UNDEFINED_LAYER )
            {
                if( item->GetBrdLayerId() == curr_item->GetBrdLayerId() )
                {
                    found = true;
                    break;
                }
            }
            else    // curr_item = dielectric layer
            {
                if( item->GetBrdLayerId() != UNDEFINED_LAYER )
                    continue;
 
                if( item->GetDielectricLayerId() == curr_item->GetDielectricLayerId() )
                {
                    found = true;
                    break;
                }
            }
        }
 
        if( !found )    // a layer was removed: a change is found
        {
            change = true;
            break;
        }
    }
 
    // Now initialize all stackup items to the initial values, when exist
    for( BOARD_STACKUP_ITEM* item : stackup.GetList() )
    {
        bool found = false;
        // Search for initial settings:
        for( const BOARD_STACKUP_ITEM* initial_item : m_list )
        {
            if( item->GetBrdLayerId() != UNDEFINED_LAYER )
            {
                if( item->GetBrdLayerId() == initial_item->GetBrdLayerId() )
                {
                    *item = *initial_item;
                    found = true;
                    break;
                }
            }
            else    // dielectric layer: see m_DielectricLayerId for identification
            {
                // Compare dielectric layer with dielectric layer
                if( initial_item->GetBrdLayerId() != UNDEFINED_LAYER )
                    continue;
 
                if( item->GetDielectricLayerId() == initial_item->GetDielectricLayerId() )
                {
                    *item = *initial_item;
                    found = true;
                    break;
                }
            }
        }
 
        if( !found )
        {
            change = true;
        }
    }
 
    // Transfer layer settings:
    *this = stackup;
 
    // Transfer other stackup settings from aSettings
    const BOARD_STACKUP& source_stackup = aSettings->GetStackupDescriptor();
    m_HasDielectricConstrains  = source_stackup.m_HasDielectricConstrains;
    m_EdgeConnectorConstraints = source_stackup.m_EdgeConnectorConstraints;
    m_EdgePlating     = source_stackup.m_EdgePlating;
    m_FinishType      = source_stackup.m_FinishType;
 
    return change;
}
 
 
void BOARD_STACKUP::BuildDefaultStackupList( const BOARD_DESIGN_SETTINGS* aSettings,
                                             int aActiveCopperLayersCount )
{
    // Creates a default stackup, according to the current BOARD_DESIGN_SETTINGS settings.
    // Note: the m_TypeName string is made translatable using _HKI marker, but is not
    // translated when building the stackup.
    // It will be used as this in files, and can be translated only in dialog
    // if aSettings == NULL, build a full stackup (with 32 copper layers)
    LSET enabledLayer = aSettings ? aSettings->GetEnabledLayers() : StackupAllowedBrdLayers();
    int copperLayerCount = aSettings ? aSettings->GetCopperLayerCount() : 32;
 
    // We need to calculate a suitable dielectric layer thickness.
    // If no settings, and if aActiveCopperLayersCount is given, use it
    // (If no settings, and no aActiveCopperLayersCount, the full 32 layers are used)
    int activeCuLayerCount = copperLayerCount;
 
    if( aSettings == nullptr && aActiveCopperLayersCount > 0 )
        activeCuLayerCount = aActiveCopperLayersCount;
 
    int brd__thickness = aSettings ? aSettings->GetBoardThickness() : pcbIUScale.mmToIU( 1.6 );
    int diel_thickness = brd__thickness -
                         ( BOARD_STACKUP_ITEM::GetCopperDefaultThickness() * activeCuLayerCount );
 
    // Take in account the solder mask thickness:
    int sm_count = ( enabledLayer & LSET( { F_Mask, B_Mask } ) ).count();
    diel_thickness -= BOARD_STACKUP_ITEM::GetMaskDefaultThickness() * sm_count;
    diel_thickness /= std::max( 1, activeCuLayerCount - 1 );
 
    int dielectric_idx = 0;
 
    // Add silk screen, solder mask and solder paste layers on top
    if( enabledLayer[F_SilkS] )
    {
        BOARD_STACKUP_ITEM* item = new BOARD_STACKUP_ITEM( BS_ITEM_TYPE_SILKSCREEN );
        item->SetBrdLayerId( F_SilkS );
        item->SetTypeName( _HKI( "Top Silk Screen" ) );
        Add( item );
    }
 
    if( enabledLayer[F_Paste] )
    {
        BOARD_STACKUP_ITEM* item = new BOARD_STACKUP_ITEM( BS_ITEM_TYPE_SOLDERPASTE );
        item->SetBrdLayerId( F_Paste );
        item->SetTypeName( _HKI( "Top Solder Paste" ) );
        Add( item );
    }
 
    if( enabledLayer[F_Mask] )
    {
        BOARD_STACKUP_ITEM* item = new BOARD_STACKUP_ITEM( BS_ITEM_TYPE_SOLDERMASK );
        item->SetBrdLayerId( F_Mask );
        item->SetTypeName( _HKI( "Top Solder Mask" ) );
        Add( item );
    }
 
    // Add copper and dielectric layers
    for( PCB_LAYER_ID layer : enabledLayer.CuStack() )
    {
        BOARD_STACKUP_ITEM* item = new BOARD_STACKUP_ITEM( BS_ITEM_TYPE_COPPER );
        item->SetBrdLayerId( layer );
        item->SetTypeName( KEY_COPPER );
        Add( item );
 
        if( layer == B_Cu )
            break;
 
        // Add the dielectric layer:
        item = new BOARD_STACKUP_ITEM( BS_ITEM_TYPE_DIELECTRIC );
        item->SetThickness( diel_thickness );
        item->SetDielectricLayerId( dielectric_idx + 1 );
 
        // Display a dielectric default layer name:
        if( (dielectric_idx & 1) == 0 )
        {
            item->SetTypeName( KEY_CORE );
            item->SetMaterial( wxT( "FR4" ) );
        }
        else
        {
            item->SetTypeName( KEY_PREPREG );
            item->SetMaterial( wxT( "FR4" ) );
        }
 
        Add( item );
        dielectric_idx++;
    }
 
    // Add silk screen, solder mask and solder paste layers on bottom
    if( enabledLayer[B_Mask] )
    {
        BOARD_STACKUP_ITEM* item = new BOARD_STACKUP_ITEM( BS_ITEM_TYPE_SOLDERMASK );
        item->SetBrdLayerId( B_Mask );
        item->SetTypeName( _HKI( "Bottom Solder Mask" ) );
        Add( item );
    }
 
    if( enabledLayer[B_Paste] )
    {
        BOARD_STACKUP_ITEM* item = new BOARD_STACKUP_ITEM( BS_ITEM_TYPE_SOLDERPASTE );
        item->SetBrdLayerId( B_Paste );
        item->SetTypeName( _HKI( "Bottom Solder Paste" ) );
        Add( item );
    }
 
    if( enabledLayer[B_SilkS] )
    {
        BOARD_STACKUP_ITEM* item = new BOARD_STACKUP_ITEM( BS_ITEM_TYPE_SILKSCREEN );
        item->SetBrdLayerId( B_SilkS );
        item->SetTypeName( _HKI( "Bottom Silk Screen" ) );
        Add( item );
    }
 
    // Transfer other stackup settings from aSettings
    if( aSettings )
    {
        const BOARD_STACKUP& source_stackup = aSettings->GetStackupDescriptor();
        m_EdgeConnectorConstraints = source_stackup.m_EdgeConnectorConstraints;
        m_HasDielectricConstrains = source_stackup.m_HasDielectricConstrains;
        m_EdgePlating     = source_stackup.m_EdgePlating;
        m_FinishType      = source_stackup.m_FinishType;
    }
}
 
 
void BOARD_STACKUP::FormatBoardStackup( OUTPUTFORMATTER* aFormatter, const BOARD* aBoard ) const
{
    // Board stackup is the ordered list from top to bottom of
    // physical layers and substrate used to build the board.
    if( m_list.empty() )
        return;
 
    aFormatter->Print( "(stackup" );
 
    // Note:
    // Unspecified parameters are not stored in file.
    for( BOARD_STACKUP_ITEM* item: m_list )
    {
        wxString layer_name;
 
        if( item->GetBrdLayerId() == UNDEFINED_LAYER )
            layer_name.Printf( wxT( "dielectric %d" ), item->GetDielectricLayerId() );
        else
            layer_name = LSET::Name( item->GetBrdLayerId() );
 
        aFormatter->Print( "(layer %s (type %s)",
                           aFormatter->Quotew( layer_name ).c_str(),
                           aFormatter->Quotew( item->GetTypeName() ).c_str() );
 
        // Output other parameters (in sub layer list there is at least one item)
        for( int idx = 0; idx < item->GetSublayersCount(); idx++ )
        {
            if( idx )    // not for the main (first) layer.
                aFormatter->Print( " addsublayer" );
 
            if( item->IsColorEditable() && IsPrmSpecified( item->GetColor( idx ) ) )
            {
                aFormatter->Print( "(color %s)",
                                   aFormatter->Quotew( item->GetColor( idx ) ).c_str() );
            }
 
            if( item->IsThicknessEditable() )
            {
                aFormatter->Print( "(thickness %s",
                                   EDA_UNIT_UTILS::FormatInternalUnits( pcbIUScale, item->GetThickness( idx ) ).c_str() );
 
                if( item->GetType() == BS_ITEM_TYPE_DIELECTRIC && item->IsThicknessLocked( idx ) )
                    aFormatter->Print( " locked" );
 
                aFormatter->Print( ")" );
            }
 
            if( item->HasMaterialValue( idx ) )
            {
                aFormatter->Print( "(material %s)",
                                   aFormatter->Quotew( item->GetMaterial( idx ) ).c_str() );
            }
 
            if( item->HasEpsilonRValue() && item->HasMaterialValue( idx ) )
                aFormatter->Print( "(epsilon_r %s)", FormatDouble2Str( item->GetEpsilonR( idx ) ).c_str() );
 
            if( item->HasLossTangentValue() && item->HasMaterialValue( idx ) )
            {
                aFormatter->Print( "(loss_tangent %s)",
                                   FormatDouble2Str( item->GetLossTangent( idx ) ).c_str() );
            }
 
            if( item->HasSpecFreqValue() && item->HasMaterialValue( idx ) )
            {
                aFormatter->Print( "(spec_frequency %s)", FormatDouble2Str( item->GetSpecFreq( idx ) ).c_str() );
 
                wxString modelToken = wxT( "constant" );
 
                if( item->GetDielectricModel( idx ) == DIELECTRIC_MODEL::DJORDJEVIC_SARKAR )
                    modelToken = wxT( "djordjevic_sarkar" );
 
                aFormatter->Print( "(dielectric_model %s)", modelToken.ToStdString().c_str() );
            }
        }
 
        aFormatter->Print( ")" );
    }
 
    // Other infos about board, related to layers and other fabrication specifications
    if( IsPrmSpecified( m_FinishType ) )
        aFormatter->Print( "(copper_finish %s)", aFormatter->Quotew( m_FinishType ).c_str() );
 
    KICAD_FORMAT::FormatBool( aFormatter, "dielectric_constraints", m_HasDielectricConstrains );
 
    if( m_EdgeConnectorConstraints > 0 )
    {
        aFormatter->Print( "(edge_connector %s)",
                           m_EdgeConnectorConstraints > 1 ? "bevelled": "yes" );
    }
 
    if( m_EdgePlating )
        KICAD_FORMAT::FormatBool( aFormatter, "edge_plating", true );
 
    aFormatter->Print( ")" );
}
 
 
int BOARD_STACKUP::GetLayerDistance( PCB_LAYER_ID aFirstLayer, PCB_LAYER_ID aSecondLayer ) const
{
    wxASSERT( IsCopperLayer( aFirstLayer ) && IsCopperLayer( aSecondLayer ) );
 
    if( aFirstLayer == aSecondLayer )
        return 0;
 
    // B_Cu is always the last copper layer but doesn't have the last numerical value
    if( aSecondLayer != B_Cu && ( aSecondLayer < aFirstLayer || aFirstLayer == B_Cu ) )
        std::swap( aFirstLayer, aSecondLayer );
 
    int total = 0;
    bool start = false;
    bool half = false;
 
    for( const BOARD_STACKUP_ITEM* item : m_list )
    {
        // Will be UNDEFINED_LAYER for dielectrics
        const PCB_LAYER_ID layer = item->GetBrdLayerId();
 
        if( layer != UNDEFINED_LAYER && !IsCopperLayer( layer ) )
            continue;   // Silk/mask layer
 
        // Reached the start copper layer?  Start counting the next dielectric after it
        if( !start && ( layer != UNDEFINED_LAYER && layer == aFirstLayer ) )
        {
            start = true;
 
            // Only count half of each internal copper layer
            if( aFirstLayer != F_Cu && aFirstLayer != B_Cu )
                half = true;
        }
        else if( !start )
            continue;
 
        // Reached the stop copper layer?  we're done
        if( start && ( layer != UNDEFINED_LAYER && layer == aSecondLayer ) )
        {
            // Only count half of each internal copper layer
            if( aSecondLayer != F_Cu && aSecondLayer != B_Cu )
                half = true;
        }
 
        for( int sublayer = 0; sublayer < item->GetSublayersCount(); sublayer++ )
        {
            const int subThickness = item->GetThickness( sublayer );
            total += half ? ( subThickness / 2 ) : subThickness;
        }
 
        half = false;
 
        if( layer != UNDEFINED_LAYER && layer == aSecondLayer )
            break;
    }
 
    return total;
}
 
 
bool IsPrmSpecified( const wxString& aPrmValue )
{
    // return true if the param value is specified:
 
    if( !aPrmValue.IsEmpty()
        && ( aPrmValue.CmpNoCase( NotSpecifiedPrm() ) != 0 )
        && aPrmValue != wxGetTranslation( NotSpecifiedPrm() ) )
        return true;
 
    return false;
}