drc_test_provider_edge_clearance.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright The 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
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#include <atomic>
#include <common.h>
#include <pcb_shape.h>
#include <pcb_board_outline.h>
#include <board_design_settings.h>
#include <footprint.h>
#include <pad.h>
#include <pcb_track.h>
#include <zone.h>
#include <geometry/seg.h>
#include <geometry/shape_segment.h>
#include <drc/drc_engine.h>
#include <drc/drc_item.h>
#include <drc/drc_rule.h>
#include <drc/drc_test_provider.h>
#include <drc/drc_rtree.h>
#include <thread_pool.h>
#include <mutex>
#include <set>
#include <tuple>
 
/*
    Board edge clearance test. Checks all items for their mechanical clearances against the board
    edge.
    Errors generated:
    - DRCE_EDGE_CLEARANCE
    - DRCE_SILK_EDGE_CLEARANCE
    - DRCE_COPPER_OUTSIDE_BOARD
*/
 
enum SILK_DISPOSITION {
    UNKNOWN = 0,
    RESOLVING,
    ON_BOARD,
    OFF_BOARD,
    CROSSES_EDGE
};
 
 
class DRC_TEST_PROVIDER_EDGE_CLEARANCE : public DRC_TEST_PROVIDER
{
public:
    DRC_TEST_PROVIDER_EDGE_CLEARANCE () :
            DRC_TEST_PROVIDER(),
            m_largestEdgeClearance( 0 ),
            m_epsilon( 0 )
    {}
 
    virtual ~DRC_TEST_PROVIDER_EDGE_CLEARANCE() = default;
 
    virtual bool Run() override;
 
    virtual const wxString GetName() const override { return wxT( "edge_clearance" ); }
 
private:
    struct WORK_UNIT
    {
        BOARD_ITEM*            item;
        PCB_LAYER_ID           shapeLayer;
        std::shared_ptr<SHAPE> shape;
    };
 
    // Half-open range of an item's per-layer entries in the work unit list
    struct COPPER_ITEM_UNITS
    {
        BOARD_ITEM* item;
        size_t      first;
        size_t      last;
    };
 
    void resolveSilkDisposition( BOARD_ITEM* aItem, const SHAPE* aItemShape, const SHAPE_POLY_SET& aBoardOutline );
 
    bool testAgainstEdge( BOARD_ITEM* item, SHAPE* itemShape, PCB_LAYER_ID shapeLayer, BOARD_ITEM* other,
                          DRC_CONSTRAINT_T aConstraintType, PCB_DRC_CODE aErrorCode );
 
    void testCopperOutsideBoard( const std::vector<WORK_UNIT>& aWorkUnits,
                                 const std::vector<COPPER_ITEM_UNITS>& aCopperItems );
 
private:
    std::vector<PAD*> m_castellatedPads;
    int               m_largestEdgeClearance;
    int               m_epsilon;
    DRC_RTREE         m_edgesTree;
 
    std::map<BOARD_ITEM*, SILK_DISPOSITION> m_silkDisposition;
    std::mutex                             m_silkMutex;
 
    // Pads/vias with non-uniform padstacks generate one work unit per unique
    // copper layer. For edge clearance, EvalRules is layer-agnostic
    // (UNDEFINED_LAYER), so per-layer reports for the same (item, edge, pos)
    // are redundant. Dedup at emission time.
    std::set<std::tuple<KIID, KIID, VECTOR2I>> m_emittedEdgeReports;
    std::mutex                                 m_emittedMutex;
};
 
 
void DRC_TEST_PROVIDER_EDGE_CLEARANCE::resolveSilkDisposition( BOARD_ITEM* aItem, const SHAPE* aItemShape,
                                                               const SHAPE_POLY_SET& aBoardOutline )
{
    SILK_DISPOSITION disposition = UNKNOWN;
 
    if( aItemShape->Type() == SH_COMPOUND )
    {
        const SHAPE_COMPOUND* compound = static_cast<const SHAPE_COMPOUND*>( aItemShape );
 
        for( const SHAPE* elem : compound->Shapes() )
        {
            SILK_DISPOSITION elem_disposition = aBoardOutline.Contains( elem->Centre() ) ? ON_BOARD : OFF_BOARD;
 
            if( disposition == UNKNOWN )
            {
                disposition = elem_disposition;
            }
            else if( disposition != elem_disposition )
            {
                disposition = CROSSES_EDGE;
                break;
            }
        }
    }
    else
    {
        disposition = aBoardOutline.Contains( aItemShape->Centre() ) ? ON_BOARD : OFF_BOARD;
    }
 
    {
        std::lock_guard<std::mutex> lock( m_silkMutex );
        m_silkDisposition[aItem] = disposition;
    }
 
    if( disposition == CROSSES_EDGE )
    {
        BOARD_ITEM* nearestEdge = nullptr;
        VECTOR2I    itemPos = aItem->GetCenter();
        VECTOR2I    nearestEdgePt = aBoardOutline.Outline( 0 ).NearestPoint( itemPos, false );
 
        for( int outlineIdx = 1; outlineIdx < aBoardOutline.OutlineCount(); ++outlineIdx )
        {
            VECTOR2I otherEdgePt = aBoardOutline.Outline( outlineIdx ).NearestPoint( itemPos, false );
 
            if( otherEdgePt.SquaredDistance( itemPos ) < nearestEdgePt.SquaredDistance( itemPos ) )
                nearestEdgePt = otherEdgePt;
        }
 
        for( BOARD_ITEM* edge : m_edgesTree.GetObjectsAt( nearestEdgePt, Edge_Cuts, m_epsilon ) )
        {
            if( edge->HitTest( nearestEdgePt, m_epsilon ) )
            {
                nearestEdge = edge;
                break;
            }
        }
 
        if( !nearestEdge )
            return;
 
        auto constraint = m_drcEngine->EvalRules( SILK_CLEARANCE_CONSTRAINT, nearestEdge, aItem, UNDEFINED_LAYER );
        int  minClearance = constraint.GetValue().Min();
 
        if( constraint.GetSeverity() != RPT_SEVERITY_IGNORE && minClearance >= 0 )
        {
            std::shared_ptr<DRC_ITEM> drcItem = DRC_ITEM::Create( DRCE_SILK_EDGE_CLEARANCE );
 
            // Report clearance info if there is any, even though crossing is just a straight-up collision
            if( minClearance > 0 )
            {
                drcItem->SetErrorDetail( formatMsg( _( "(%s clearance %s; actual %s)" ),
                                                    constraint.GetName(),
                                                    minClearance,
                                                    0 ) );
            }
 
            drcItem->SetItems( nearestEdge->m_Uuid, aItem->m_Uuid );
            drcItem->SetViolatingRule( constraint.GetParentRule() );
            reportTwoPointGeometry( drcItem, nearestEdgePt, nearestEdgePt, nearestEdgePt, aItem->GetLayer() );
        }
    }
#if 0
    // If you want "Silk outside board edge" errors:
    else if( disposition == OFF_BOARD )
    {
        std::shared_ptr<DRC_ITEM> drcItem = DRC_ITEM::Create( DRCE_SILK_EDGE_CLEARANCE );
        drcItem->SetErrorMessage( _( "Silkscreen outside board edge" ) );
 
        drcItem->SetItems( aItem->m_Uuid );
        reportTwoPointGeometry( drcItem, aItem->GetCenter(), aItem->GetCenter(), aItem->GetCenter(),
                                aItem->GetLayer() );
    }
#endif
}
 
 
bool DRC_TEST_PROVIDER_EDGE_CLEARANCE::testAgainstEdge( BOARD_ITEM* item, SHAPE* itemShape, PCB_LAYER_ID shapeLayer,
                                                        BOARD_ITEM* edge, DRC_CONSTRAINT_T aConstraintType,
                                                        PCB_DRC_CODE aErrorCode )
{
    std::shared_ptr<SHAPE> shape = edge->GetEffectiveShape( Edge_Cuts );
 
    auto     constraint = m_drcEngine->EvalRules( aConstraintType, edge, item, UNDEFINED_LAYER );
    int      minClearance = constraint.GetValue().Min();
    int      actual;
    VECTOR2I pos;
 
    if( constraint.GetSeverity() != RPT_SEVERITY_IGNORE && minClearance >= 0 )
    {
        if( itemShape->Collide( shape.get(), std::max( 0, minClearance - m_epsilon ), &actual, &pos ) )
        {
            if( item->Type() == PCB_TRACE_T || item->Type() == PCB_ARC_T )
            {
                // Edge collisions are allowed inside the holes of castellated pads
                for( PAD* castellatedPad : m_castellatedPads )
                {
                    if( castellatedPad->GetEffectiveHoleShape()->Collide( pos ) )
                        return true;
                }
            }
 
            {
                std::lock_guard<std::mutex> lock( m_emittedMutex );
 
                if( !m_emittedEdgeReports.insert( { item->m_Uuid, edge->m_Uuid, pos } ).second )
                {
                    // Same (item, edge, pos) already reported from another work unit.
                    if( item->Type() == PCB_TRACE_T || item->Type() == PCB_ARC_T )
                        return m_drcEngine->GetReportAllTrackErrors();
                    else
                        return false;
                }
            }
 
            std::shared_ptr<DRC_ITEM> drcItem = DRC_ITEM::Create( aErrorCode );
 
            // Only report clearance info if there is any; otherwise it's just a straight collision
            if( minClearance > 0 )
            {
                drcItem->SetErrorDetail( formatMsg( _( "(%s clearance %s; actual %s)" ),
                                                    constraint.GetName(),
                                                    minClearance,
                                                    actual ) );
            }
 
            drcItem->SetItems( edge->m_Uuid, item->m_Uuid );
            drcItem->SetViolatingRule( constraint.GetParentRule() );
            reportTwoItemGeometry( drcItem, pos, edge, item, shapeLayer, actual );
 
            if( aErrorCode == DRCE_SILK_EDGE_CLEARANCE )
            {
                std::lock_guard<std::mutex> lock( m_silkMutex );
                m_silkDisposition[item] = CROSSES_EDGE;
            }
 
            if( item->Type() == PCB_TRACE_T || item->Type() == PCB_ARC_T )
                return m_drcEngine->GetReportAllTrackErrors();
            else
                return false;   // don't report violations with multiple edges; one is enough
        }
    }
 
    return true;
}
 
 
void DRC_TEST_PROVIDER_EDGE_CLEARANCE::testCopperOutsideBoard( const std::vector<WORK_UNIT>& aWorkUnits,
                                                               const std::vector<COPPER_ITEM_UNITS>& aCopperItems )
{
    // Rebuilt rather than read from BoardOutline(), which keeps partial contours of a malformed outline
    SHAPE_POLY_SET outline;
 
    if( !m_board->GetBoardPolygonOutlines( outline, false ) || outline.OutlineCount() == 0 )
        return;
 
    outline.Fracture();
    outline.BuildBBoxCaches();
 
    // Collide() triangulates lazily, which would stall every worker behind the first one
    outline.CacheTriangulation( false, {}, true );
 
    auto testItem =
            [&]( const int idx ) -> size_t
            {
                if( m_drcEngine->IsCancelled() || m_drcEngine->IsErrorLimitExceeded( DRCE_COPPER_OUTSIDE_BOARD ) )
                    return 0;
 
                const COPPER_ITEM_UNITS& copperItem = aCopperItems[idx];
 
                for( size_t ii = copperItem.first; ii < copperItem.last; ++ii )
                {
                    if( outline.Collide( aWorkUnits[ii].shape.get() ) )
                        return 0;
                }
 
                BOARD_ITEM*  item = copperItem.item;
                PCB_LAYER_ID layer = aWorkUnits[copperItem.first].shapeLayer;
 
                if( layer == UNDEFINED_LAYER )
                    layer = item->GetLayer();
 
                std::shared_ptr<DRC_ITEM> drcItem = DRC_ITEM::Create( DRCE_COPPER_OUTSIDE_BOARD );
                drcItem->SetItems( item );
                reportViolation( drcItem, item->GetPosition(), layer );
                return 1;
            };
 
    thread_pool& tp = GetKiCadThreadPool();
    auto         futures = tp.submit_loop( 0, aCopperItems.size(), testItem );
 
    futures.wait();
}
 
 
bool DRC_TEST_PROVIDER_EDGE_CLEARANCE::Run()
{
    if( !m_drcEngine->IsErrorLimitExceeded( DRCE_EDGE_CLEARANCE )
        || !m_drcEngine->IsErrorLimitExceeded( DRCE_COPPER_OUTSIDE_BOARD ) )
    {
        if( !reportPhase( _( "Checking copper to board edge clearances..." ) ) )
            return false;    // DRC cancelled
    }
    else if( !m_drcEngine->IsErrorLimitExceeded( DRCE_SILK_EDGE_CLEARANCE ) )
    {
        if( !reportPhase( _( "Checking silk to board edge clearances..." ) ) )
            return false;    // DRC cancelled
    }
    else
    {
        REPORT_AUX( wxT( "Edge clearance violations ignored. Tests not run." ) );
        return true;         // continue with other tests
    }
 
    m_board = m_drcEngine->GetBoard();
    m_castellatedPads.clear();
    m_epsilon = m_board->GetDesignSettings().GetDRCEpsilon();
    m_edgesTree.clear();
    m_silkDisposition.clear();
    m_emittedEdgeReports.clear();
 
    DRC_CONSTRAINT worstClearanceConstraint;
 
    if( m_drcEngine->QueryWorstConstraint( EDGE_CLEARANCE_CONSTRAINT, worstClearanceConstraint ) )
        m_largestEdgeClearance = worstClearanceConstraint.GetValue().Min();
 
    /*
     * Build an RTree of the various edges and margins found on the board.
     */
    std::vector<std::unique_ptr<PCB_SHAPE>> edges;
 
    forEachGeometryItem( { PCB_SHAPE_T }, LSET( { Edge_Cuts, Margin } ),
            [&]( BOARD_ITEM *item ) -> bool
            {
                PCB_SHAPE*    shape = static_cast<PCB_SHAPE*>( item );
                STROKE_PARAMS stroke = shape->GetStroke();
 
                if( item->IsOnLayer( Edge_Cuts ) )
                    stroke.SetWidth( 0 );
 
                if( shape->GetShape() == SHAPE_T::RECTANGLE && !shape->IsSolidFill() )
                {
                    // A single rectangle for the board would defeat the RTree, so convert to edges
                    if( shape->GetCornerRadius() > 0 )
                    {
                        for( SHAPE* subshape : shape->MakeEffectiveShapes( true ) )
                        {
                            if( SHAPE_SEGMENT* segment = dynamic_cast<SHAPE_SEGMENT*>( subshape ) )
                            {
                                edges.emplace_back( static_cast<PCB_SHAPE*>( shape->Clone() ) );
                                edges.back()->SetShape( SHAPE_T::SEGMENT );
                                edges.back()->SetStart( segment->GetStart() );
                                edges.back()->SetEnd( segment->GetEnd() );
                                edges.back()->SetStroke( stroke );
                            }
                            else if( SHAPE_ARC* arc = dynamic_cast<SHAPE_ARC*>( subshape ) )
                            {
                                edges.emplace_back( static_cast<PCB_SHAPE*>( shape->Clone() ) );
                                edges.back()->SetShape( SHAPE_T::ARC );
                                edges.back()->SetArcGeometry( arc->GetP0(), arc->GetArcMid(), arc->GetP1() );
                                edges.back()->SetStroke( stroke );
                            }
                            else
                            {
                                wxFAIL_MSG(
                                        wxString::Format( "Unexpected effective shape type %d for rounded rectangle",
                                                          (int) subshape->Type() ) );
                                continue;
                            }
                        }
                    }
                    else
                    {
                    edges.emplace_back( static_cast<PCB_SHAPE*>( shape->Clone() ) );
                        edges.back()->SetShape( SHAPE_T::SEGMENT );
                        edges.back()->SetEndX( shape->GetStartX() );
                        edges.back()->SetStroke( stroke );
                        edges.emplace_back( static_cast<PCB_SHAPE*>( shape->Clone() ) );
                        edges.back()->SetShape( SHAPE_T::SEGMENT );
                        edges.back()->SetEndY( shape->GetStartY() );
                        edges.back()->SetStroke( stroke );
                        edges.emplace_back( static_cast<PCB_SHAPE*>( shape->Clone() ) );
                        edges.back()->SetShape( SHAPE_T::SEGMENT );
                        edges.back()->SetStartX( shape->GetEndX() );
                        edges.back()->SetStroke( stroke );
                        edges.emplace_back( static_cast<PCB_SHAPE*>( shape->Clone() ) );
                        edges.back()->SetShape( SHAPE_T::SEGMENT );
                        edges.back()->SetStartY( shape->GetEndY() );
                        edges.back()->SetStroke( stroke );
                    }
                }
                else if( shape->GetShape() == SHAPE_T::POLY
                            && !shape->IsSolidFill()
                            && !shape->GetPolyShape().IsEmpty() )
                {
                    // A single polygon for the board would defeat the RTree, so convert to edges.
                    SHAPE_LINE_CHAIN poly = shape->GetPolyShape().Outline( 0 );
 
                    for( int ii = 0; ii < (int) poly.GetSegmentCount(); ++ii )
                    {
                        SEG seg = poly.CSegment( ii );
                        edges.emplace_back( static_cast<PCB_SHAPE*>( shape->Clone() ) );
                        edges.back()->SetShape( SHAPE_T::SEGMENT );
                        edges.back()->SetStart( seg.A );
                        edges.back()->SetEnd( seg.B );
                        edges.back()->SetStroke( stroke );
                    }
                }
                else
                {
                    edges.emplace_back( static_cast<PCB_SHAPE*>( shape->Clone() ) );
                    edges.back()->SetStroke( stroke );
                }
 
                return true;
            } );
 
    for( const std::unique_ptr<PCB_SHAPE>& edge : edges )
    {
        for( PCB_LAYER_ID layer : { Edge_Cuts, Margin } )
        {
            if( edge->IsOnLayer( layer ) )
                m_edgesTree.Insert( edge.get(), layer, EDGE_CLEARANCE_CONSTRAINT, m_largestEdgeClearance );
        }
    }
 
    for( FOOTPRINT* footprint : m_board->Footprints() )
    {
        for( PAD* pad : footprint->Pads() )
        {
            if( pad->GetProperty() == PAD_PROP::CASTELLATED )
                m_castellatedPads.push_back( pad );
        }
    }
 
    m_edgesTree.Build();
 
    /*
     * Collect all testable (item, layer, shape) tuples, then test against edges in parallel.
     * Flattening to per-layer work units ensures even distribution across threads, since
     * zones with many layers become many separate work units rather than one heavy item.
     * Pre-fetching shapes avoids per-zone mutex contention during parallel testing.
     */
    std::vector<WORK_UNIT>         workUnits;
    std::vector<COPPER_ITEM_UNITS> copperItems;
 
    forEachGeometryItem( s_allBasicItems, LSET::AllLayersMask(),
            [&]( BOARD_ITEM *item ) -> bool
            {
                if( isInvisibleText( item ) )
                    return true;
 
                if( item->Type() == PCB_ZONE_T )
                {
                    // Rule areas have no copper and are purely logical -- skip edge clearance.
                    if( static_cast<ZONE*>( item )->GetIsRuleArea() )
                        return true;
                }
 
                if( item->Type() == PCB_PAD_T )
                {
                    PAD* pad = static_cast<PAD*>( item );
 
                    if( pad->GetProperty() == PAD_PROP::CASTELLATED
                        || pad->GetAttribute() == PAD_ATTRIB::CONN )
                    {
                        return true;
                    }
                }
 
                std::vector<PCB_LAYER_ID> layersToTest;
 
                switch( item->Type() )
                {
                case PCB_PAD_T:
                    layersToTest = static_cast<PAD*>( item )->Padstack().UniqueLayers();
                    break;
 
                case PCB_VIA_T:
                    layersToTest = static_cast<PCB_VIA*>( item )->Padstack().UniqueLayers();
                    break;
 
                case PCB_ZONE_T:
                    for( PCB_LAYER_ID layer : item->GetLayerSet() )
                        layersToTest.push_back( layer );
 
                    break;
 
                default:
                    layersToTest = { UNDEFINED_LAYER };
                }
 
                size_t firstUnit = workUnits.size();
 
                for( PCB_LAYER_ID layer : layersToTest )
                {
                    workUnits.push_back(
                            { item, layer, item->GetEffectiveShape( layer ) } );
                }
 
                // Zone fills are already clipped to the board outline
                if( item->Type() != PCB_ZONE_T && item->IsOnCopperLayer() )
                    copperItems.push_back( { item, firstUnit, workUnits.size() } );
 
                return true;
            } );
 
    std::atomic<size_t> done( 0 );
    size_t              count = workUnits.size();
 
    auto processWorkUnit =
            [&]( const int idx ) -> size_t
            {
                if( m_drcEngine->IsCancelled() )
                {
                    done.fetch_add( 1 );
                    return 0;
                }
 
                bool testCopper = !m_drcEngine->IsErrorLimitExceeded( DRCE_EDGE_CLEARANCE );
                bool testSilk = !m_drcEngine->IsErrorLimitExceeded( DRCE_SILK_EDGE_CLEARANCE );
 
                if( !testCopper && !testSilk )
                {
                    done.fetch_add( 1 );
                    return 0;
                }
 
                WORK_UNIT&  wu = workUnits[idx];
                BOARD_ITEM* item = wu.item;
 
                for( PCB_LAYER_ID testLayer : { Edge_Cuts, Margin } )
                {
                    if( testCopper && item->IsOnCopperLayer() )
                    {
                        m_edgesTree.QueryColliding( item, wu.shapeLayer, testLayer, nullptr,
                                [&]( BOARD_ITEM* edge ) -> bool
                                {
                                    return testAgainstEdge( item, wu.shape.get(),
                                                           wu.shapeLayer, edge,
                                                           EDGE_CLEARANCE_CONSTRAINT,
                                                           DRCE_EDGE_CLEARANCE );
                                },
                                m_largestEdgeClearance );
                    }
 
                    if( testSilk
                        && ( item->IsOnLayer( F_SilkS )
                             || item->IsOnLayer( B_SilkS ) ) )
                    {
                        m_edgesTree.QueryColliding( item, wu.shapeLayer, testLayer, nullptr,
                                [&]( BOARD_ITEM* edge ) -> bool
                                {
                                    return testAgainstEdge( item, wu.shape.get(),
                                                           wu.shapeLayer, edge,
                                                           SILK_CLEARANCE_CONSTRAINT,
                                                           DRCE_SILK_EDGE_CLEARANCE );
                                },
                                m_largestEdgeClearance );
                    }
                }
 
                if( testSilk
                    && ( item->IsOnLayer( F_SilkS ) || item->IsOnLayer( B_SilkS ) ) )
                {
                    bool needsResolution = false;
 
                    {
                        std::lock_guard<std::mutex> lock( m_silkMutex );
                        auto [it, inserted] = m_silkDisposition.try_emplace( item, RESOLVING );
 
                        if( inserted || it->second == UNKNOWN )
                        {
                            it->second = RESOLVING;
                            needsResolution = true;
                        }
                    }
 
                    if( needsResolution && m_board->BoardOutline()->HasOutline() )
                    {
                        resolveSilkDisposition( item, wu.shape.get(),
                                                m_board->BoardOutline()->GetOutline() );
                    }
                }
 
                done.fetch_add( 1 );
                return 1;
            };
 
    thread_pool& tp = GetKiCadThreadPool();
    size_t       numBlocks = count;
    auto         futures = tp.submit_loop( 0, count, processWorkUnit, numBlocks );
 
    while( done < count )
    {
        reportProgress( done, count );
 
        if( m_drcEngine->IsCancelled() )
        {
            for( auto& f : futures )
                f.wait();
 
            break;
        }
 
        futures.wait_for( std::chrono::milliseconds( 250 ) );
    }
 
    if( !m_drcEngine->IsCancelled() && !m_drcEngine->IsErrorLimitExceeded( DRCE_COPPER_OUTSIDE_BOARD ) )
        testCopperOutsideBoard( workUnits, copperItems );
 
    return !m_drcEngine->IsCancelled();
}
 
 
namespace detail
{
    static DRC_REGISTER_TEST_PROVIDER<DRC_TEST_PROVIDER_EDGE_CLEARANCE> dummy;
}