length_delay_calculation_item.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
 *
 * 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 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 <length_delay_calculation/length_delay_calculation.h>
#include <length_delay_calculation/length_delay_calculation_item.h>
 
#include <board.h>
#include <pad.h>
#include <pcb_track.h>
 
 
void LENGTH_DELAY_CALCULATION_ITEM::CalculateViaLayers( const BOARD* aBoard )
{
    // Only consider trace connections when determining via electrical span. Pads are excluded
    // because they have their own pad-to-die length handling, and including them would cause
    // through-hole vias to incorrectly span to layers where TH pads exist (e.g., connector pins)
    // rather than just the layers where traces actually connect.
    static std::initializer_list<KICAD_T> traceTypes = { PCB_TRACE_T, PCB_ARC_T };
 
    PCB_LAYER_ID top_layer = UNDEFINED_LAYER;
    PCB_LAYER_ID bottom_layer = UNDEFINED_LAYER;
 
    const LSET layers = aBoard->GetDesignSettings().GetEnabledLayers();
 
    for( auto layer_it = layers.copper_layers_begin(); layer_it != layers.copper_layers_end(); ++layer_it )
    {
        if( aBoard->GetConnectivity()->IsConnectedOnLayer( m_via, *layer_it, traceTypes ) )
        {
            if( top_layer == UNDEFINED_LAYER )
                top_layer = *layer_it;
            else
                bottom_layer = *layer_it;
        }
    }
 
    if( top_layer == UNDEFINED_LAYER )
        top_layer = m_via->TopLayer();
    if( bottom_layer == UNDEFINED_LAYER )
        bottom_layer = m_via->BottomLayer();
 
    SetLayers( top_layer, bottom_layer );
}