drc_test_provider_solder_mask.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004-2022 KiCad Developers.
 *
 * 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 2
 * 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
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 * or you may write to the Free Software Foundation, Inc.,
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 */
 
#include <common.h>
#include <board_design_settings.h>
#include <board_connected_item.h>
#include <footprint.h>
#include <pad.h>
#include <pcb_track.h>
#include <pcb_text.h>
#include <zone.h>
#include <geometry/seg.h>
#include <drc/drc_engine.h>
#include <drc/drc_item.h>
#include <drc/drc_rule.h>
#include <drc/drc_test_provider_clearance_base.h>
#include <drc/drc_rtree.h>
 
/*
    Solder mask tests. Checks for silkscreen which is clipped by mask openings and for bridges
    between mask apertures with different nets.
    Errors generated:
    - DRCE_SILK_CLEARANCE
    - DRCE_SOLDERMASK_BRIDGE
*/
 
class DRC_TEST_PROVIDER_SOLDER_MASK : public ::DRC_TEST_PROVIDER
{
public:
    DRC_TEST_PROVIDER_SOLDER_MASK ():
            m_board( nullptr ),
            m_webWidth( 0 ),
            m_maxError( 0 ),
            m_largestClearance( 0 )
    {
        m_bridgeRule.m_Name = _( "board setup solder mask min width" );
    }
 
    virtual ~DRC_TEST_PROVIDER_SOLDER_MASK()
    {
    }
 
    virtual bool Run() override;
 
    virtual const wxString GetName() const override
    {
        return wxT( "solder_mask_issues" );
    };
 
    virtual const wxString GetDescription() const override
    {
        return wxT( "Tests for silkscreen being clipped by solder mask and copper being exposed "
                    "by mask apertures of other nets" );
    }
 
private:
    void addItemToRTrees( BOARD_ITEM* aItem );
    void buildRTrees();
 
    void testSilkToMaskClearance();
    void testMaskBridges();
 
    void testItemAgainstItems( BOARD_ITEM* aItem, const BOX2I& aItemBBox,
                               PCB_LAYER_ID aRefLayer, PCB_LAYER_ID aTargetLayer );
    void testMaskItemAgainstZones( BOARD_ITEM* item, const BOX2I& itemBBox,
                                   PCB_LAYER_ID refLayer, PCB_LAYER_ID targetLayer );
 
    bool checkMaskAperture( BOARD_ITEM* aMaskItem, BOARD_ITEM* aTestItem, PCB_LAYER_ID aTestLayer,
                            int aTestNet, BOARD_ITEM** aCollidingItem );
 
    bool checkItemMask( BOARD_ITEM* aMaskItem, int aTestNet );
 
private:
    DRC_RULE m_bridgeRule;
 
    BOARD*   m_board;
    int      m_webWidth;
    int      m_maxError;
    int      m_largestClearance;
 
    std::unique_ptr<DRC_RTREE> m_fullSolderMaskRTree;
    std::unique_ptr<DRC_RTREE> m_itemTree;
 
    std::unordered_map<PTR_PTR_CACHE_KEY, LSET> m_checkedPairs;
 
    // Shapes used to define solder mask apertures don't have nets, so we assign them the
    // first object+net that bridges their aperture (after which any other nets will generate
    // violations).
    std::unordered_map<PTR_LAYER_CACHE_KEY, std::pair<BOARD_ITEM*, int>> m_maskApertureNetMap;
};
 
 
void DRC_TEST_PROVIDER_SOLDER_MASK::addItemToRTrees( BOARD_ITEM* aItem )
{
    ZONE* solderMask = m_board->m_SolderMaskBridges;
 
    if( aItem->Type() == PCB_ZONE_T )
    {
        ZONE* zone = static_cast<ZONE*>( aItem );
 
        for( PCB_LAYER_ID layer : { F_Mask, B_Mask } )
        {
            if( zone->IsOnLayer( layer ) )
            {
                solderMask->GetFill( layer )->BooleanAdd( *zone->GetFilledPolysList( layer ),
                                                          SHAPE_POLY_SET::PM_FAST );
            }
        }
    }
    else if( aItem->Type() == PCB_PAD_T )
    {
        for( PCB_LAYER_ID layer : { F_Mask, B_Mask } )
        {
            if( aItem->IsOnLayer( layer ) )
            {
                PAD* pad = static_cast<PAD*>( aItem );
                int clearance = ( m_webWidth / 2 ) + pad->GetSolderMaskExpansion( layer );
 
                aItem->TransformShapeToPolygon( *solderMask->GetFill( layer ), layer, clearance,
                                                m_maxError, ERROR_OUTSIDE );
 
                m_itemTree->Insert( aItem, layer, m_largestClearance );
            }
        }
    }
    else if( aItem->Type() == PCB_VIA_T )
    {
        for( PCB_LAYER_ID layer : { F_Mask, B_Mask } )
        {
            if( aItem->IsOnLayer( layer ) )
            {
                PCB_VIA* via = static_cast<PCB_VIA*>( aItem );
                int      clearance = ( m_webWidth / 2 ) + via->GetSolderMaskExpansion();
 
                via->TransformShapeToPolygon( *solderMask->GetFill( layer ), layer, clearance,
                                              m_maxError, ERROR_OUTSIDE );
 
                m_itemTree->Insert( aItem, layer, m_largestClearance );
            }
        }
    }
    else if( aItem->Type() == PCB_FIELD_T || aItem->Type() == PCB_TEXT_T )
    {
        for( PCB_LAYER_ID layer : { F_Mask, B_Mask } )
        {
            if( aItem->IsOnLayer( layer ) )
            {
                const PCB_TEXT* text = static_cast<const PCB_TEXT*>( aItem );
 
                text->TransformTextToPolySet( *solderMask->GetFill( layer ),
                                              m_webWidth / 2, m_maxError, ERROR_OUTSIDE );
 
                m_itemTree->Insert( aItem, layer, m_largestClearance );
            }
        }
    }
    else
    {
        for( PCB_LAYER_ID layer : { F_Mask, B_Mask } )
        {
            if( aItem->IsOnLayer( layer ) )
            {
                aItem->TransformShapeToPolygon( *solderMask->GetFill( layer ), layer,
                                                m_webWidth / 2, m_maxError, ERROR_OUTSIDE );
 
                m_itemTree->Insert( aItem, layer, m_largestClearance );
            }
        }
    }
}
 
 
void DRC_TEST_PROVIDER_SOLDER_MASK::buildRTrees()
{
    ZONE*  solderMask = m_board->m_SolderMaskBridges;
    LSET   layers( { F_Mask, B_Mask, F_Cu, B_Cu } );
 
    const size_t progressDelta = 500;
    int          count = 0;
    int          ii = 0;
 
    solderMask->GetFill( F_Mask )->RemoveAllContours();
    solderMask->GetFill( B_Mask )->RemoveAllContours();
 
    m_fullSolderMaskRTree = std::make_unique<DRC_RTREE>();
    m_itemTree = std::make_unique<DRC_RTREE>();
 
    forEachGeometryItem( s_allBasicItems, layers,
            [&]( BOARD_ITEM* item ) -> bool
            {
                ++count;
                return true;
            } );
 
    forEachGeometryItem( s_allBasicItems, layers,
            [&]( BOARD_ITEM* item ) -> bool
            {
                if( !reportProgress( ii++, count, progressDelta ) )
                    return false;
 
                addItemToRTrees( item );
                return true;
            } );
 
    solderMask->GetFill( F_Mask )->Simplify( SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );
    solderMask->GetFill( B_Mask )->Simplify( SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );
 
    solderMask->GetFill( F_Mask )->Deflate( m_webWidth / 2, CORNER_STRATEGY::CHAMFER_ALL_CORNERS,
                                            m_maxError );
    solderMask->GetFill( B_Mask )->Deflate( m_webWidth / 2, CORNER_STRATEGY::CHAMFER_ALL_CORNERS,
                                            m_maxError );
 
    solderMask->SetFillFlag( F_Mask, true );
    solderMask->SetFillFlag( B_Mask, true );
    solderMask->SetIsFilled( true );
 
    solderMask->CacheTriangulation();
 
    m_fullSolderMaskRTree->Insert( solderMask, F_Mask );
    m_fullSolderMaskRTree->Insert( solderMask, B_Mask );
 
    m_checkedPairs.clear();
}
 
 
void DRC_TEST_PROVIDER_SOLDER_MASK::testSilkToMaskClearance()
{
    LSET   silkLayers( { F_SilkS, B_SilkS } );
 
    const size_t progressDelta = 250;
    int          count = 0;
    int          ii = 0;
 
    forEachGeometryItem( s_allBasicItems, silkLayers,
            [&]( BOARD_ITEM* item ) -> bool
            {
                ++count;
                return true;
            } );
 
    forEachGeometryItem( s_allBasicItems, silkLayers,
            [&]( BOARD_ITEM* item ) -> bool
            {
                if( m_drcEngine->IsErrorLimitExceeded( DRCE_SILK_CLEARANCE ) )
                    return false;
 
                if( !reportProgress( ii++, count, progressDelta ) )
                    return false;
 
                if( isInvisibleText( item ) )
                    return true;
 
                for( PCB_LAYER_ID layer : silkLayers.Seq() )
                {
                    if( !item->IsOnLayer( layer ) )
                        continue;
 
                    PCB_LAYER_ID   maskLayer = layer == F_SilkS ? F_Mask : B_Mask;
                    BOX2I          itemBBox = item->GetBoundingBox();
                    DRC_CONSTRAINT constraint = m_drcEngine->EvalRules( SILK_CLEARANCE_CONSTRAINT,
                                                                        item, nullptr, maskLayer );
                    int            clearance = constraint.GetValue().Min();
                    int            actual;
                    VECTOR2I       pos;
 
                    if( constraint.GetSeverity() == RPT_SEVERITY_IGNORE || clearance < 0 )
                        return true;
 
                    std::shared_ptr<SHAPE> itemShape = item->GetEffectiveShape( layer );
 
                    if( m_fullSolderMaskRTree->QueryColliding( itemBBox, itemShape.get(), maskLayer,
                                                               clearance, &actual, &pos ) )
                    {
                        auto drce = DRC_ITEM::Create( DRCE_SILK_CLEARANCE );
 
                        if( clearance > 0 )
                        {
                            wxString msg = formatMsg( _( "(%s clearance %s; actual %s)" ),
                                                      constraint.GetName(),
                                                      clearance,
                                                      actual );
 
                            drce->SetErrorMessage( drce->GetErrorText() + wxS( " " ) + msg );
                        }
 
                        drce->SetItems( item );
                        drce->SetViolatingRule( constraint.GetParentRule() );
 
                        reportViolation( drce, pos, layer );
                    }
                }
 
                return true;
            } );
}
 
 
bool isNullAperture( BOARD_ITEM* aItem )
{
    if( aItem->Type() == PCB_PAD_T )
    {
        PAD* pad = static_cast<PAD*>( aItem );
 
        // TODO(JE) padstacks
        if( pad->GetAttribute() == PAD_ATTRIB::NPTH
                && ( pad->GetShape( PADSTACK::ALL_LAYERS ) == PAD_SHAPE::CIRCLE
                     || pad->GetShape( PADSTACK::ALL_LAYERS ) == PAD_SHAPE::OVAL )
                && pad->GetSize( PADSTACK::ALL_LAYERS ).x <= pad->GetDrillSize().x
                && pad->GetSize( PADSTACK::ALL_LAYERS ).y <= pad->GetDrillSize().y )
        {
            return true;
        }
    }
 
    return false;
}
 
 
// Simple mask apertures aren't associated with copper items, so they only constitute a bridge
// when they expose other copper items having at least two distinct nets.  We use a map to record
// the first net exposed by each mask aperture (on each copper layer).
//
// Note that this algorithm is also used for free pads.
 
bool isMaskAperture( BOARD_ITEM* aItem )
{
    if( aItem->Type() == PCB_PAD_T && static_cast<PAD*>( aItem )->IsFreePad() )
        return true;
 
    static const LSET saved( { F_Mask, B_Mask } );
 
    LSET maskLayers = aItem->GetLayerSet() & saved;
    LSET copperLayers = ( aItem->GetLayerSet() & ~saved ) & LSET::AllCuMask();
 
    return maskLayers.count() > 0 && copperLayers.count() == 0;
}
 
 
bool DRC_TEST_PROVIDER_SOLDER_MASK::checkMaskAperture( BOARD_ITEM* aMaskItem, BOARD_ITEM* aTestItem,
                                                       PCB_LAYER_ID aTestLayer, int aTestNet,
                                                       BOARD_ITEM** aCollidingItem )
{
    if( aTestLayer == F_Mask && !aTestItem->IsOnLayer( PADSTACK::ALL_LAYERS ) )
        return false;
 
    if( aTestLayer == B_Mask && !aTestItem->IsOnLayer( B_Cu ) )
        return false;
 
    PCB_LAYER_ID maskLayer = IsFrontLayer( aTestLayer ) ? F_Mask : B_Mask;
 
    FOOTPRINT* fp = aMaskItem->GetParentFootprint();
 
    if( fp && ( fp->GetAttributes() & FP_ALLOW_SOLDERMASK_BRIDGES ) > 0 )
    {
        // Mask apertures in footprints which allow soldermask bridges are ignored entirely.
        return false;
    }
 
    PTR_LAYER_CACHE_KEY key = { aMaskItem, maskLayer };
 
    auto ii = m_maskApertureNetMap.find( key );
 
    if( ii == m_maskApertureNetMap.end() )
    {
        m_maskApertureNetMap[ key ] = { aTestItem, aTestNet };
 
        // First net; no bridge yet....
        return false;
    }
 
    auto& [cacheKey, cacheEntry] = *ii;
    auto& [alreadyEncounteredItem, encounteredItemNet] = cacheEntry;
 
    if( encounteredItemNet == aTestNet && aTestNet >= 0 )
    {
        // Same net; still no bridge...
        return false;
    }
 
    if( fp && aTestItem->GetParentFootprint() == fp )
    {
        std::map<wxString, int> padToNetTieGroupMap = fp->MapPadNumbersToNetTieGroups();
        PAD*                    padA = nullptr;
        PAD*                    padB = nullptr;
 
        if( alreadyEncounteredItem->Type() == PCB_PAD_T )
            padA = static_cast<PAD*>( alreadyEncounteredItem );
 
        if( aTestItem->Type() == PCB_PAD_T )
            padB = static_cast<PAD*>( aTestItem );
 
        if( padA && padB && ( padA->SameLogicalPadAs( padB ) || padA->SharesNetTieGroup( padB ) ) )
        {
            return false;
        }
        else if( padA && aTestItem->Type() == PCB_SHAPE_T )
        {
            if( padToNetTieGroupMap.contains( padA->GetNumber() ) )
                return false;
        }
        else if( padB && alreadyEncounteredItem->Type() == PCB_SHAPE_T )
        {
            if( padToNetTieGroupMap.contains( padB->GetNumber() ) )
                return false;
        }
    }
 
    *aCollidingItem = alreadyEncounteredItem;
    return true;
}
 
 
bool DRC_TEST_PROVIDER_SOLDER_MASK::checkItemMask( BOARD_ITEM* aMaskItem, int aTestNet )
{
    FOOTPRINT* fp = aMaskItem->GetParentFootprint();
 
    wxCHECK( fp, false );
 
    if( ( fp->GetAttributes() & FP_ALLOW_SOLDERMASK_BRIDGES ) > 0 )
    {
        // If we're allowing bridges then we're allowing bridges.  Nothing to check.
        return false;
    }
 
    // Graphic items are used to implement net-ties between pads of a group within a net-tie
    // footprint.  They must be allowed to intrude into their pad's mask aperture.
    if( aTestNet < 0 && aMaskItem->Type() == PCB_PAD_T && fp->IsNetTie() )
    {
        std::map<wxString, int> padNumberToGroupIdxMap = fp->MapPadNumbersToNetTieGroups();
 
        if( padNumberToGroupIdxMap[ static_cast<PAD*>( aMaskItem )->GetNumber() ] >= 0 )
            return false;
    }
 
    return true;
}
 
 
void DRC_TEST_PROVIDER_SOLDER_MASK::testItemAgainstItems( BOARD_ITEM* aItem, const BOX2I& aItemBBox,
                                                          PCB_LAYER_ID aRefLayer,
                                                          PCB_LAYER_ID aTargetLayer )
{
    int itemNet = -1;
 
    if( aItem->IsConnected() )
        itemNet = static_cast<BOARD_CONNECTED_ITEM*>( aItem )->GetNetCode();
 
    BOARD_DESIGN_SETTINGS& bds = aItem->GetBoard()->GetDesignSettings();
    PAD*                   pad = aItem->Type() == PCB_PAD_T ? static_cast<PAD*>( aItem )
                                                            : nullptr;
    PCB_VIA*               via = aItem->Type() == PCB_VIA_T ? static_cast<PCB_VIA*>( aItem )
                                                            : nullptr;
    std::shared_ptr<SHAPE> itemShape = aItem->GetEffectiveShape( aRefLayer );
 
    m_itemTree->QueryColliding( aItem, aRefLayer, aTargetLayer,
            // Filter:
            [&]( BOARD_ITEM* other ) -> bool
            {
                FOOTPRINT* itemFP = aItem->GetParentFootprint();
                PAD*       otherPad = other->Type() == PCB_PAD_T ? static_cast<PAD*>( other )
                                                                 : nullptr;
                int        otherNet = -1;
 
                if( other->IsConnected() )
                    otherNet = static_cast<BOARD_CONNECTED_ITEM*>( other )->GetNetCode();
 
                if( otherNet > 0 && otherNet == itemNet )
                    return false;
 
                if( isNullAperture( other ) )
                    return false;
 
                if( itemFP && itemFP == other->GetParentFootprint() )
                {
                    // Board-wide exclusion
                    if( bds.m_AllowSoldermaskBridgesInFPs )
                        return false;
 
                    // Footprint-specific exclusion
                    if( ( itemFP->GetAttributes() & FP_ALLOW_SOLDERMASK_BRIDGES ) > 0 )
                        return false;
                }
 
                if( pad && otherPad && ( pad->SameLogicalPadAs( otherPad )
                                         || pad->SharesNetTieGroup( otherPad ) ) )
                {
                    return false;
                }
 
                BOARD_ITEM* a = aItem;
                BOARD_ITEM* b = other;
 
                // store canonical order so we don't collide in both directions (a:b and b:a)
                if( static_cast<void*>( a ) > static_cast<void*>( b ) )
                    std::swap( a, b );
 
                auto it = m_checkedPairs.find( { a, b } );
 
                if( it != m_checkedPairs.end() && it->second.test( aTargetLayer ) )
                {
                    return false;
                }
                else
                {
                    m_checkedPairs[ { a, b } ].set( aTargetLayer );
                    return true;
                }
            },
            // Visitor:
            [&]( BOARD_ITEM* other ) -> bool
            {
                PAD*     otherPad = other->Type() == PCB_PAD_T ? static_cast<PAD*>( other )
                                                               : nullptr;
                PCB_VIA* otherVia = other->Type() == PCB_VIA_T ? static_cast<PCB_VIA*>( other )
                                                               : nullptr;
                auto     otherShape = other->GetEffectiveShape( aTargetLayer );
                int      otherNet = -1;
 
                if( other->IsConnected() )
                    otherNet = static_cast<BOARD_CONNECTED_ITEM*>( other )->GetNetCode();
 
                int      actual;
                VECTOR2I pos;
                int      clearance = 0;
 
                if( aRefLayer == F_Mask || aRefLayer == B_Mask )
                {
                    // Aperture-to-aperture must enforce web-min-width
                    clearance = m_webWidth;
                }
                else // ( aRefLayer == F_Cu || aRefLayer == B_Cu )
                {
                    // Copper-to-aperture uses the solder-mask-to-copper-clearance
                    clearance = m_board->GetDesignSettings().m_SolderMaskToCopperClearance;
                }
 
                if( pad )
                    clearance += pad->GetSolderMaskExpansion( PADSTACK::ALL_LAYERS );
                else if( via && !via->IsTented( aRefLayer ) )
                    clearance += via->GetSolderMaskExpansion();
 
                if( otherPad )
                    clearance += otherPad->GetSolderMaskExpansion( PADSTACK::ALL_LAYERS );
                else if( otherVia && !otherVia->IsTented( aRefLayer ) )
                    clearance += otherVia->GetSolderMaskExpansion();
 
                if( itemShape->Collide( otherShape.get(), clearance, &actual, &pos ) )
                {
                    wxString    msg;
                    BOARD_ITEM* colliding = nullptr;
 
                    if( aTargetLayer == F_Mask )
                        msg = _( "Front solder mask aperture bridges items with different nets" );
                    else
                        msg = _( "Rear solder mask aperture bridges items with different nets" );
 
                    // Simple mask apertures aren't associated with copper items, so they only
                    // constitute a bridge when they expose other copper items having at least
                    // two distinct nets.
                    if( isMaskAperture( aItem ) )
                    {
                        if( checkMaskAperture( aItem, other, aRefLayer, otherNet, &colliding ) )
                        {
                            auto drce = DRC_ITEM::Create( DRCE_SOLDERMASK_BRIDGE );
 
                            drce->SetErrorMessage( msg );
                            drce->SetItems( aItem, colliding, other );
                            drce->SetViolatingRule( &m_bridgeRule );
                            reportViolation( drce, pos, aTargetLayer );
                        }
                    }
                    else if( isMaskAperture( other ) )
                    {
                        if( checkMaskAperture( other, aItem, aRefLayer, itemNet, &colliding ) )
                        {
                            auto drce = DRC_ITEM::Create( DRCE_SOLDERMASK_BRIDGE );
 
                            drce->SetErrorMessage( msg );
                            drce->SetItems( other, colliding, aItem );
                            drce->SetViolatingRule( &m_bridgeRule );
                            reportViolation( drce, pos, aTargetLayer );
                        }
                    }
                    else if( checkItemMask( other, itemNet ) )
                    {
                        auto drce = DRC_ITEM::Create( DRCE_SOLDERMASK_BRIDGE );
 
                        drce->SetErrorMessage( msg );
                        drce->SetItems( aItem, other );
                        drce->SetViolatingRule( &m_bridgeRule );
                        reportViolation( drce, pos, aTargetLayer );
                    }
                }
 
                return !m_drcEngine->IsCancelled();
            },
            m_largestClearance );
}
 
 
void DRC_TEST_PROVIDER_SOLDER_MASK::testMaskItemAgainstZones( BOARD_ITEM* aItem,
                                                              const BOX2I& aItemBBox,
                                                              PCB_LAYER_ID aMaskLayer,
                                                              PCB_LAYER_ID aTargetLayer )
{
    for( ZONE* zone : m_board->m_DRCCopperZones )
    {
        if( !zone->GetLayerSet().test( aTargetLayer ) )
            continue;
 
        int zoneNet = zone->GetNetCode();
 
        if( aItem->IsConnected() )
        {
            BOARD_CONNECTED_ITEM* connectedItem = static_cast<BOARD_CONNECTED_ITEM*>( aItem );
 
            if( zoneNet == connectedItem->GetNetCode() && zoneNet > 0 )
                continue;
        }
 
        BOX2I inflatedBBox( aItemBBox );
        int   clearance = m_board->GetDesignSettings().m_SolderMaskToCopperClearance;
 
        if( aItem->Type() == PCB_PAD_T )
            clearance += static_cast<PAD*>( aItem )->GetSolderMaskExpansion( PADSTACK::ALL_LAYERS );
        else if( aItem->Type() == PCB_VIA_T )
            clearance += static_cast<PCB_VIA*>( aItem )->GetSolderMaskExpansion();
 
        inflatedBBox.Inflate( clearance );
 
        if( !inflatedBBox.Intersects( zone->GetBoundingBox() ) )
            continue;
 
        DRC_RTREE* zoneTree = m_board->m_CopperZoneRTreeCache[ zone ].get();
        int        actual;
        VECTOR2I   pos;
 
        std::shared_ptr<SHAPE> itemShape = aItem->GetEffectiveShape( aMaskLayer );
 
        if( zoneTree && zoneTree->QueryColliding( aItemBBox, itemShape.get(), aTargetLayer,
                                                  clearance, &actual, &pos ) )
        {
            wxString    msg;
            BOARD_ITEM* colliding = nullptr;
 
            if( aMaskLayer == F_Mask )
                msg = _( "Front solder mask aperture bridges items with different nets" );
            else
                msg = _( "Rear solder mask aperture bridges items with different nets" );
 
            // Simple mask apertures aren't associated with copper items, so they only constitute
            // a bridge when they expose other copper items having at least two distinct nets.
            if( isMaskAperture( aItem ) && zoneNet >= 0 )
            {
                if( checkMaskAperture( aItem, zone, aTargetLayer, zoneNet, &colliding ) )
                {
                    auto drce = DRC_ITEM::Create( DRCE_SOLDERMASK_BRIDGE );
 
                    drce->SetErrorMessage( msg );
                    drce->SetItems( aItem, colliding, zone );
                    drce->SetViolatingRule( &m_bridgeRule );
                    reportViolation( drce, pos, aTargetLayer );
                }
            }
            else
            {
                auto drce = DRC_ITEM::Create( DRCE_SOLDERMASK_BRIDGE );
 
                drce->SetErrorMessage( msg );
                drce->SetItems( aItem, zone );
                drce->SetViolatingRule( &m_bridgeRule );
                reportViolation( drce, pos, aTargetLayer );
            }
        }
 
        if( m_drcEngine->IsCancelled() )
            return;
    }
}
 
 
void DRC_TEST_PROVIDER_SOLDER_MASK::testMaskBridges()
{
    LSET copperAndMaskLayers( { F_Mask, B_Mask, F_Cu, B_Cu } );
 
    const size_t progressDelta = 250;
    int          count = 0;
    int          ii = 0;
 
    forEachGeometryItem( s_allBasicItemsButZones, copperAndMaskLayers,
            [&]( BOARD_ITEM* item ) -> bool
            {
                ++count;
                return true;
            } );
 
    forEachGeometryItem( s_allBasicItemsButZones, copperAndMaskLayers,
            [&]( BOARD_ITEM* item ) -> bool
            {
                if( m_drcEngine->IsErrorLimitExceeded( DRCE_SOLDERMASK_BRIDGE ) )
                    return false;
 
                if( !reportProgress( ii++, count, progressDelta ) )
                    return false;
 
                BOX2I itemBBox = item->GetBoundingBox();
 
                if( item->IsOnLayer( F_Mask ) && !isNullAperture( item ) )
                {
                    // Test for aperture-to-aperture collisions
                    testItemAgainstItems( item, itemBBox, F_Mask, F_Mask );
 
                    // Test for aperture-to-zone collisions
                    testMaskItemAgainstZones( item, itemBBox, F_Mask, F_Cu );
                }
                else if( item->IsOnLayer( PADSTACK::ALL_LAYERS ) )
                {
                    // Test for copper-item-to-aperture collisions
                    testItemAgainstItems( item, itemBBox, F_Cu, F_Mask );
                }
 
                if( item->IsOnLayer( B_Mask ) && !isNullAperture( item ) )
                {
                    // Test for aperture-to-aperture collisions
                    testItemAgainstItems( item, itemBBox, B_Mask, B_Mask );
 
                    // Test for aperture-to-zone collisions
                    testMaskItemAgainstZones( item, itemBBox, B_Mask, B_Cu );
                }
                else if( item->IsOnLayer( B_Cu ) )
                {
                    // Test for copper-item-to-aperture collisions
                    testItemAgainstItems( item, itemBBox, B_Cu, B_Mask );
                }
 
                return true;
            } );
}
 
 
bool DRC_TEST_PROVIDER_SOLDER_MASK::Run()
{
    if( m_drcEngine->IsErrorLimitExceeded( DRCE_SILK_CLEARANCE )
            && m_drcEngine->IsErrorLimitExceeded( DRCE_SOLDERMASK_BRIDGE ) )
    {
        reportAux( wxT( "Solder mask violations ignored. Tests not run." ) );
        return true;    // continue with other tests
    }
 
    m_board = m_drcEngine->GetBoard();
    m_webWidth = m_board->GetDesignSettings().m_SolderMaskMinWidth;
    m_maxError = m_board->GetDesignSettings().m_MaxError;
    m_largestClearance = 0;
 
    for( FOOTPRINT* footprint : m_board->Footprints() )
    {
        for( PAD* pad : footprint->Pads() )
            m_largestClearance = std::max( m_largestClearance, pad->GetSolderMaskExpansion( PADSTACK::ALL_LAYERS ) );
    }
 
    // Order is important here: m_webWidth must be added in before m_largestCourtyardClearance is
    // maxed with the various SILK_CLEARANCE_CONSTRAINTS.
    m_largestClearance += m_largestClearance + m_webWidth;
 
    DRC_CONSTRAINT worstClearanceConstraint;
 
    if( m_drcEngine->QueryWorstConstraint( SILK_CLEARANCE_CONSTRAINT, worstClearanceConstraint ) )
        m_largestClearance = std::max( m_largestClearance, worstClearanceConstraint.m_Value.Min() );
 
    reportAux( wxT( "Worst clearance : %d nm" ), m_largestClearance );
 
    if( !reportPhase( _( "Building solder mask..." ) ) )
        return false;   // DRC cancelled
 
    m_checkedPairs.clear();
    m_maskApertureNetMap.clear();
 
    buildRTrees();
 
    if( !reportPhase( _( "Checking solder mask to silk clearance..." ) ) )
        return false;   // DRC cancelled
 
    testSilkToMaskClearance();
 
    if( !reportPhase( _( "Checking solder mask web integrity..." ) ) )
        return false;   // DRC cancelled
 
    testMaskBridges();
 
    reportRuleStatistics();
 
    return !m_drcEngine->IsCancelled();
}
 
 
namespace detail
{
    static DRC_REGISTER_TEST_PROVIDER<DRC_TEST_PROVIDER_SOLDER_MASK> dummy;
}