drc_test_provider_sliver_checker.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2021-2022 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
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#include <atomic>
#include <board.h>
#include <board_design_settings.h>
#include <zone.h>
#include <footprint.h>
#include <pcb_shape.h>
#include <geometry/shape_poly_set.h>
#include <drc/drc_rule.h>
#include <drc/drc_item.h>
#include <drc/drc_test_provider.h>
#include <advanced_config.h>
#include <progress_reporter.h>
#include <thread_pool.h>
 
/*
 Checks for slivers in copper layers
 
 Errors generated:
 - DRCE_COPPER_SLIVER
*/
 
class DRC_TEST_PROVIDER_SLIVER_CHECKER : public DRC_TEST_PROVIDER
{
public:
 DRC_TEST_PROVIDER_SLIVER_CHECKER()
 {
 }
 
 virtual ~DRC_TEST_PROVIDER_SLIVER_CHECKER()
 {
 }
 
 virtual bool Run() override;
 
 virtual const wxString GetName() const override
 {
 return wxT( "sliver checker" );
 };
 
 virtual const wxString GetDescription() const override
 {
 return wxT( "Checks copper layers for slivers" );
 }
 
private:
 wxString layerDesc( PCB_LAYER_ID aLayer );
};
 
 
wxString DRC_TEST_PROVIDER_SLIVER_CHECKER::layerDesc( PCB_LAYER_ID aLayer )
{
 return wxString::Format( wxT( "(%s)" ), m_drcEngine->GetBoard()->GetLayerName( aLayer ) );
}
 
 
bool DRC_TEST_PROVIDER_SLIVER_CHECKER::Run()
{
 if( m_drcEngine->IsErrorLimitExceeded( DRCE_COPPER_SLIVER ) )
 return true; // Continue with other tests
 
 if( !reportPhase( _( "Running sliver detection on copper layers..." ) ) )
 return false; // DRC cancelled
 
 int64_t widthTolerance = pcbIUScale.mmToIU( ADVANCED_CFG::GetCfg().m_SliverWidthTolerance );
 int64_t squared_width = widthTolerance * widthTolerance;
 
 double angleTolerance = ADVANCED_CFG::GetCfg().m_SliverAngleTolerance;
 double cosangleTol = 2.0 * cos( DEG2RAD( angleTolerance ) );
 LSET copperLayerSet = m_drcEngine->GetBoard()->GetEnabledLayers() & LSET::AllCuMask();
 LSEQ copperLayers = copperLayerSet.Seq();
 int layerCount = copperLayers.size();
 
 // Report progress on board zones only. Everything else is in the noise.
 int zoneLayerCount = 0;
 std::atomic<size_t> done( 1 );
 
 for( PCB_LAYER_ID layer : copperLayers )
 {
 for( ZONE* zone : m_drcEngine->GetBoard()->Zones() )
 {
 if( !zone->GetIsRuleArea() && zone->IsOnLayer( layer ) )
 zoneLayerCount++;
 }
 }
 
 PROGRESS_REPORTER* reporter = m_drcEngine->GetProgressReporter();
 
 if( reporter && reporter->IsCancelled() )
 return false; // DRC cancelled
 
 std::vector<SHAPE_POLY_SET> layerPolys( layerCount );
 
 auto build_layer_polys =
 [&]( int layerIdx ) -> size_t
 {
 PCB_LAYER_ID layer = copperLayers[layerIdx];
 SHAPE_POLY_SET& poly = layerPolys[layerIdx];
 
 if( m_drcEngine->IsCancelled() )
 return 0;
 
 SHAPE_POLY_SET fill;
 
 forEachGeometryItem( s_allBasicItems, LSET().set( layer ),
 [&]( BOARD_ITEM* item ) -> bool
 {
 if( ZONE* zone = dynamic_cast<ZONE*>( item) )
 {
 if( !zone->GetIsRuleArea() )
 {
 fill = zone->GetFill( layer )->CloneDropTriangulation();
 poly.Append( fill );
 
 // Report progress on board zones only. Everything else is
 // in the noise.
 done.fetch_add( 1 );
 }
 }
 else
 {
 item->TransformShapeToPolygon( poly, layer, 0, ARC_LOW_DEF,
 ERROR_INSIDE );
 }
 
 if( m_drcEngine->IsCancelled() )
 return false;
 
 return true;
 } );
 
 
 if( m_drcEngine->IsCancelled() )
 return 0;
 
 poly.Simplify( SHAPE_POLY_SET::POLYGON_MODE::PM_FAST );
 
 return 1;
 };
 
 thread_pool& tp = GetKiCadThreadPool();
 std::vector<std::future<size_t>> returns;
 
 returns.reserve( copperLayers.size() );
 
 for( size_t ii = 0; ii < copperLayers.size(); ++ii )
 returns.emplace_back( tp.submit( build_layer_polys, ii ) );
 
 for( const std::future<size_t>& ret : returns )
 {
 std::future_status status = ret.wait_for( std::chrono::milliseconds( 250 ) );
 
 while( status != std::future_status::ready )
 {
 m_drcEngine->ReportProgress( static_cast<double>( zoneLayerCount ) / done );
 
 status = ret.wait_for( std::chrono::milliseconds( 250 ) );
 }
 }
 
 for( int ii = 0; ii < layerCount; ++ii )
 {
 PCB_LAYER_ID layer = copperLayers[ii];
 SHAPE_POLY_SET& poly = layerPolys[ii];
 
 if( m_drcEngine->IsErrorLimitExceeded( DRCE_COPPER_SLIVER ) )
 continue;
 
 // Frequently, in filled areas, some points of the polygons are very near (dist is only
 // a few internal units, like 2 or 3 units.
 // We skip very small vertices: one cannot really compute a valid orientation of
 // such a vertex
 // So skip points near than min_len (in internal units).
 const int min_len = pcbIUScale.mmToIU( ADVANCED_CFG::GetCfg().m_SliverMinimumLength );
 
 for( int jj = 0; jj < poly.OutlineCount(); ++jj )
 {
 const std::vector<VECTOR2I>& pts = poly.Outline( jj ).CPoints();
 int ptCount = pts.size();
 int offset = 0;
 
 auto area = [&]( const VECTOR2I& p, const VECTOR2I& q, const VECTOR2I& r ) -> VECTOR2I::extended_type
 {
 return static_cast<VECTOR2I::extended_type>( q.y - p.y ) * ( r.x - q.x ) -
 static_cast<VECTOR2I::extended_type>( q.x - p.x ) * ( r.y - q.y );
 };
 
 auto isLocallyInside = [&]( int aA, int aB ) -> bool
 {
 int prev = ( ptCount + aA - 1 ) % ptCount;
 int next = ( aA + 1 ) % ptCount;
 
 if( area( pts[prev], pts[aA], pts[next] ) < 0 )
 return area( pts[aA], pts[aB], pts[next] ) >= 0 && area( pts[aA], pts[prev], pts[aB] ) >= 0;
 else
 return area( pts[aA], pts[aB], pts[prev] ) < 0 || area( pts[aA], pts[next], pts[aB] ) < 0;
 };
 
 if( ptCount <= 5 )
 continue;
 
 for( int kk = 0; kk < ptCount; kk += offset )
 {
 int prior_index = ( ptCount + kk - 1 ) % ptCount;
 int next_index = ( kk + 1 ) % ptCount;
 VECTOR2I pt = pts[ kk ];
 VECTOR2I ptPrior = pts[ prior_index ];
 VECTOR2I vPrior = ( ptPrior - pt );
 int forward_offset = 1;
 
 offset = 1;
 
 while( std::abs( vPrior.x ) < min_len && std::abs( vPrior.y ) < min_len
 && offset < ptCount )
 {
 pt = pts[ ( kk + offset++ ) % ptCount ];
 vPrior = ( ptPrior - pt );
 }
 
 if( offset >= ptCount )
 break;
 
 VECTOR2I ptAfter = pts[ next_index ];
 VECTOR2I vAfter = ( ptAfter - pt );
 
 while( std::abs( vAfter.x ) < min_len && std::abs( vAfter.y ) < min_len
 && forward_offset < ptCount )
 {
 next_index = ( kk + forward_offset++ ) % ptCount;
 ptAfter = pts[ next_index ];
 vAfter = ( ptAfter - pt );
 }
 
 if( offset >= ptCount )
 break;
 
 // Negative dot product means that the angle is > 90°
 if( vPrior.Dot( vAfter ) <= 0 )
 continue;
 
 if( !isLocallyInside( prior_index, next_index ) )
 continue;
 
 VECTOR2I vIncluded = ptAfter - ptPrior;
 double arm1 = vPrior.SquaredEuclideanNorm();
 double arm2 = vAfter.SquaredEuclideanNorm();
 double opp = vIncluded.SquaredEuclideanNorm();
 
 double cos_ang = std::abs( ( opp - arm1 - arm2 ) / ( std::sqrt( arm1 ) * std::sqrt( arm2 ) ) );
 
 if( cos_ang > cosangleTol && 2.0 - cos_ang > std::numeric_limits<float>::epsilon() && opp > squared_width )
 {
 std::shared_ptr<DRC_ITEM> drce = DRC_ITEM::Create( DRCE_COPPER_SLIVER );
 drce->SetErrorMessage( drce->GetErrorText() + wxS( " " ) + layerDesc( layer ) );
 reportViolation( drce, pt, layer );
 }
 }
 }
 }
 
 return true;
}
 
 
namespace detail
{
static DRC_REGISTER_TEST_PROVIDER<DRC_TEST_PROVIDER_SLIVER_CHECKER> dummy;
}