pcb_painter.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013-2019 CERN
 * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
 *
 * @author Tomasz Wlostowski <[email protected]>
 * @author Maciej Suminski <[email protected]>
 *
 * 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 <advanced_config.h>
#include <board.h>
#include <netinfo.h>
#include <board_design_settings.h>
#include <pcb_drill_chart.h>
#include <pcb_drill_map.h>
#include <pcb_track.h>
#include <pcb_group.h>
#include <footprint.h>
#include <pad.h>
#include <pcb_shape.h>
#include <string_utils.h>
#include <zone.h>
#include <pcb_reference_image.h>
#include <pcb_text.h>
#include <pcb_textbox.h>
#include <drill/drill_enumerator.h>
#include <drill/drill_symbol_assigner.h>
#include <drill/drill_symbol_profile.h>
#include <plotters/drill_markers.h>
#include <pcb_table.h>
#include <pcb_tablecell.h>
#include <pcb_marker.h>
#include <pcb_dimension.h>
#include <pcb_point.h>
#include <pcb_barcode.h>
#include <pcb_target.h>
#include <pcb_board_outline.h>
#include <pcb_grid_item.h>
 
#include <layer_ids.h>
#include <lset.h>
#include <pcb_painter.h>
#include <pcb_display_options.h>
#include <project/net_settings.h>
#include <settings/color_settings.h>
#include <settings/common_settings.h>
#include <settings/settings_manager.h>
#include <settings/cvpcb_settings.h>
#include <pcbnew_settings.h>
#include <footprint_editor_settings.h>
 
#include <convert_basic_shapes_to_polygon.h>
#include <gal/graphics_abstraction_layer.h>
#include <callback_gal.h>
#include <geometry/geometry_utils.h>
#include <geometry/shape_line_chain.h>
#include <geometry/shape_rect.h>
#include <geometry/shape_poly_set.h>
#include <geometry/roundrect.h>
#include <geometry/shape_segment.h>
#include <geometry/shape_simple.h>
#include <geometry/shape_circle.h>
#include <geometry/shape_arc.h>
#include <stroke_params.h>
#include <bezier_curves.h>
#include <kiface_base.h>
#include <gr_text.h>
#include <pgm_base.h>
 
using namespace KIGFX;
 
 
PCBNEW_SETTINGS* pcbconfig()
{
    return dynamic_cast<PCBNEW_SETTINGS*>( Kiface().KifaceSettings() );
}
 
// Helpers for display options existing in Cvpcb and Pcbnew
// Note, when running Cvpcb, pcbconfig() returns nullptr and viewer_settings()
// returns the viewer options existing to Cvpcb and Pcbnew
PCB_VIEWERS_SETTINGS_BASE* PCB_PAINTER::viewer_settings()
{
    switch( m_frameType )
    {
    case FRAME_PCB_EDITOR:
    case FRAME_PCB_DISPLAY3D:
    default:
        return Pgm().GetSettingsManager().GetAppSettings<PCBNEW_SETTINGS>( "pcbnew" );
 
    case FRAME_FOOTPRINT_EDITOR:
    case FRAME_FOOTPRINT_WIZARD:
        return Pgm().GetSettingsManager().GetAppSettings<FOOTPRINT_EDITOR_SETTINGS>( "fpedit" );
 
    case FRAME_FOOTPRINT_VIEWER:
    case FRAME_FOOTPRINT_CHOOSER:
    case FRAME_FOOTPRINT_PREVIEW:
    case FRAME_CVPCB:
    case FRAME_CVPCB_DISPLAY:
        return Pgm().GetSettingsManager().GetAppSettings<CVPCB_SETTINGS>( "cvpcb" );
    }
}
 
 
PCB_RENDER_SETTINGS::PCB_RENDER_SETTINGS()
{
    m_backgroundColor = COLOR4D( 0.0, 0.0, 0.0, 1.0 );
    m_ZoneDisplayMode = ZONE_DISPLAY_MODE::SHOW_FILLED;
    m_netColorMode = NET_COLOR_MODE::RATSNEST;
    m_ContrastModeDisplay = HIGH_CONTRAST_MODE::NORMAL;
 
    m_trackOpacity    = 1.0;
    m_viaOpacity      = 1.0;
    m_padOpacity      = 1.0;
    m_zoneOpacity     = 1.0;
    m_imageOpacity    = 1.0;
    m_filledShapeOpacity    = 1.0;
 
    m_ForcePadSketchModeOn = false;
 
    m_PadEditModePad = nullptr;
 
    SetDashLengthRatio( 12 );       // From ISO 128-2
    SetGapLengthRatio( 3 );         // From ISO 128-2
 
    m_ForceShowFieldsWhenFPSelected = true;
 
    update();
}
 
 
void PCB_RENDER_SETTINGS::LoadColors( const COLOR_SETTINGS* aSettings )
{
    SetBackgroundColor( aSettings->GetColor( LAYER_PCB_BACKGROUND ) );
 
    // Init board layers colors:
    for( int i = 0; i < PCB_LAYER_ID_COUNT; i++ )
    {
        m_layerColors[i] = aSettings->GetColor( i );
 
        // Guard: if the alpha channel is too small, the layer is not visible.
        if( m_layerColors[i].a < 0.2 )
            m_layerColors[i].a = 0.2;
    }
 
    // Init specific graphic layers colors:
    for( int i = GAL_LAYER_ID_START; i < GAL_LAYER_ID_END; i++ )
        m_layerColors[i] = aSettings->GetColor( i );
 
    // A per-board-layer GAL layer is unknown to every theme and resolves to UNSPECIFIED,
    // which is transparent, so take the colour of the documentation layer hosting the map
    for( int i = 0; i < PCB_LAYER_ID_COUNT; i++ )
        m_layerColors[DRILL_SYMBOL_LAYER_FOR( i )] = m_layerColors[i];
 
    // Colors for layers that aren't theme-able
    m_layerColors[LAYER_PAD_PLATEDHOLES] = aSettings->GetColor( LAYER_PCB_BACKGROUND );
    m_layerColors[LAYER_PAD_NETNAMES]    = aSettings->GetColor( NETNAMES_LAYER_ID_START );
 
    // Netnames for copper layers
    const COLOR4D lightLabel = aSettings->GetColor( NETNAMES_LAYER_ID_START );
    const COLOR4D darkLabel = lightLabel.Inverted();
 
    for( PCB_LAYER_ID layer : LSET::AllCuMask().CuStack() )
    {
        if( m_layerColors[layer].GetBrightness() > 0.5 )
            m_layerColors[GetNetnameLayer( layer )] = darkLabel;
        else
            m_layerColors[GetNetnameLayer( layer )] = lightLabel;
    }
 
    if( PgmOrNull() )   // can be null if used without project (i.e. from python script)
        m_hiContrastFactor = 1.0f - Pgm().GetCommonSettings()->m_Appearance.hicontrast_dimming_factor;
    else
        m_hiContrastFactor = 1.0f - 0.8f;   // default value
 
    update();
}
 
 
void PCB_RENDER_SETTINGS::LoadDisplayOptions( const PCB_DISPLAY_OPTIONS& aOptions )
{
    m_hiContrastEnabled   = aOptions.m_ContrastModeDisplay != HIGH_CONTRAST_MODE::NORMAL;
    m_ZoneDisplayMode     = aOptions.m_ZoneDisplayMode;
    m_ContrastModeDisplay = aOptions.m_ContrastModeDisplay;
    m_netColorMode        = aOptions.m_NetColorMode;
 
    m_trackOpacity    = aOptions.m_TrackOpacity;
    m_viaOpacity      = aOptions.m_ViaOpacity;
    m_padOpacity      = aOptions.m_PadOpacity;
    m_zoneOpacity     = aOptions.m_ZoneOpacity;
    m_imageOpacity    = aOptions.m_ImageOpacity;
    m_filledShapeOpacity = aOptions.m_FilledShapeOpacity;
}
 
 
COLOR4D PCB_RENDER_SETTINGS::GetColor( const VIEW_ITEM* aItem, int aLayer ) const
{
    return GetColor( dynamic_cast<const BOARD_ITEM*>( aItem ), aLayer );
}
 
 
COLOR4D PCB_RENDER_SETTINGS::GetColor( const BOARD_ITEM* aItem, int aLayer ) const
{
    int netCode = -1;
    int originalLayer = aLayer;
 
    if( aLayer == LAYER_MARKER_SHADOWS )
        return m_backgroundColor.WithAlpha( 0.5 );
 
    if( aLayer == LAYER_LOCKED_ITEM_SHADOW )
        return m_layerColors.at( aLayer );
 
    if( aLayer == LAYER_CONSTRAINT_SHADOW )
        return m_layerColors.at( aLayer );
 
    // SMD pads use the copper netname layer
    if( aLayer == LAYER_PAD_FR_NETNAMES )
        aLayer = GetNetnameLayer( F_Cu );
    else if( aLayer == LAYER_PAD_BK_NETNAMES )
        aLayer = GetNetnameLayer( B_Cu );
 
    if( IsHoleLayer( aLayer ) && m_isPrinting )
    {
        // Careful that we don't end up with the same colour for the annular ring and the hole
        // when printing in B&W.
        const PAD*     pad = dynamic_cast<const PAD*>( aItem );
        const PCB_VIA* via = dynamic_cast<const PCB_VIA*>( aItem );
        int            holeLayer = aLayer;
        int            annularRingLayer = UNDEFINED_LAYER;
 
        if( pad && pad->GetAttribute() == PAD_ATTRIB::PTH )
        {
            LSET copperLayers = pad->GetLayerSet() & LSET::AllCuMask();
 
            if( !copperLayers.empty() )
                annularRingLayer = copperLayers.Seq().front();
        }
        else if( via )
        {
            annularRingLayer = F_Cu;
        }
 
        if( annularRingLayer != UNDEFINED_LAYER )
        {
            auto it = m_layerColors.find( holeLayer );
            auto it2 = m_layerColors.find( annularRingLayer );
 
            if( it != m_layerColors.end() && it2 != m_layerColors.end() && it->second == it2->second )
                aLayer = LAYER_PCB_BACKGROUND;
        }
    }
 
    // Zones should pull from the copper layer
    if( aItem && aItem->Type() == PCB_ZONE_T )
    {
        if( IsZoneFillLayer( aLayer ) )
            aLayer = aLayer - LAYER_ZONE_START;
    }
 
    // Points use the LAYER_POINTS color for their virtual per-layer layers
    if( IsPointsLayer( aLayer ) )
        aLayer = LAYER_POINTS;
 
    // Pad and via copper and clearance outlines take their color from the copper layer
    if( IsPadCopperLayer( aLayer ) )
    {
        if( pcbconfig() && aItem && aItem->Type() == PCB_PAD_T )
        {
            const PAD* pad = static_cast<const PAD*>( aItem );
 
            // Old-skool display for people who struggle with change
            if( pcbconfig()->m_Display.m_UseViaColorForNormalTHPadstacks
                    && pad->GetAttribute() == PAD_ATTRIB::PTH
                    && pad->Padstack().Mode() == PADSTACK::MODE::NORMAL )
            {
                aLayer = LAYER_VIA_HOLES;
            }
            else
            {
                aLayer = aLayer - LAYER_PAD_COPPER_START;
            }
        }
        else
        {
            aLayer = aLayer - LAYER_PAD_COPPER_START;
        }
    }
    else if( IsViaCopperLayer( aLayer ) )
        aLayer = aLayer - LAYER_VIA_COPPER_START;
    else if( IsClearanceLayer( aLayer ) )
        aLayer = aLayer - LAYER_CLEARANCE_START;
 
    // Use via "golden copper" hole color for pad hole walls for contrast
    else if( aLayer == LAYER_PAD_HOLEWALLS )
        aLayer = LAYER_VIA_HOLES;
 
    // Show via mask layers if appropriate
    if( aLayer == LAYER_VIA_THROUGH && !m_isPrinting )
    {
        if( aItem && aItem->GetBoard() )
        {
            LSET visibleLayers = aItem->GetBoard()->GetVisibleLayers()
                                 & aItem->GetBoard()->GetEnabledLayers()
                                 & aItem->GetLayerSet();
 
            if( GetActiveLayer() == F_Mask && visibleLayers.test( F_Mask ) )
            {
                aLayer = F_Mask;
            }
            else if( GetActiveLayer() == B_Mask && visibleLayers.test( B_Mask ) )
            {
                aLayer = B_Mask;
            }
            else if( ( visibleLayers & LSET::AllCuMask() ).none() )
            {
                if( visibleLayers.any() )
                    aLayer = visibleLayers.Seq().back();
            }
        }
    }
 
    // Normal path: get the layer base color
    auto it = m_layerColors.find( aLayer );
    COLOR4D color = it == m_layerColors.end() ? COLOR4D::WHITE : it->second;
 
    if( !aItem )
        return color;
 
    // Selection disambiguation
    if( aItem->IsBrightened() || ( aItem->Type() == PCB_MARKER_T && aItem->IsSelected() ) )
    {
        if( aItem->Type() == PCB_MARKER_T )
        {
            auto itemLayerIter = m_layerColors.find( LAYER_DRC_HIGHLIGHTED );
 
            if( itemLayerIter != m_layerColors.end() )
                return itemLayerIter->second;
        }
 
        return color.Brightened( m_selectFactor ).WithAlpha( 0.8 );
    }
 
    // Normal selection
    if( aItem->IsSelected() )
    {
        // Selection for tables is done with a background wash, so pass in nullptr to GetColor()
        // so we just get the "normal" (un-selected/un-brightened) color for the borders.
        if( BaseType( aItem->Type() ) != PCB_TABLE_T && aItem->Type() != PCB_TABLECELL_T )
        {
            auto it_selected = m_layerColorsSel.find( aLayer );
            color = it_selected == m_layerColorsSel.end() ? color.Brightened( 0.8 ) : it_selected->second;
        }
    }
 
    // Some graphic objects are BOARD_CONNECTED_ITEM, but they are seen here as
    // actually board connected objects only if on a copper layer
    const BOARD_CONNECTED_ITEM* conItem = nullptr;
 
    if( aItem->IsConnected() && aItem->IsOnCopperLayer() )
        conItem = static_cast<const BOARD_CONNECTED_ITEM*>( aItem );
 
    // Try to obtain the netcode for the aItem
    if( conItem )
        netCode = conItem->GetNetCode();
 
    bool highlighted = m_highlightEnabled && m_highlightNetcodes.count( netCode );
    bool selected    = aItem->IsSelected();
 
    // Apply net color overrides
    if( conItem && m_netColorMode == NET_COLOR_MODE::ALL && IsCopperLayer( aLayer ) )
    {
        COLOR4D netColor = COLOR4D::UNSPECIFIED;
 
        auto ii = m_netColors.find( netCode );
 
        if( ii != m_netColors.end() )
            netColor = ii->second;
 
        if( netColor == COLOR4D::UNSPECIFIED )
        {
            const NETCLASS* nc = conItem->GetEffectiveNetClass();
 
            if( nc->HasPcbColor() )
                netColor = nc->GetPcbColor();
        }
 
        if( netColor == COLOR4D::UNSPECIFIED )
            netColor = color;
 
        if( selected )
        {
            // Selection brightening overrides highlighting
            netColor.Brighten( m_selectFactor );
        }
        else if( m_highlightEnabled )
        {
            // Highlight brightens objects on all layers and darkens everything else for contrast
            if( highlighted )
                netColor.Brighten( m_highlightFactor );
            else
                netColor.Darken( 1.0 - m_highlightFactor );
        }
 
        color = netColor;
    }
    else if( !selected && m_highlightEnabled )
    {
        // Single net highlight mode
        if( m_highlightNetcodes.contains( netCode ) )
        {
            auto it_hi = m_layerColorsHi.find( aLayer );
            color = it_hi == m_layerColorsHi.end() ? color.Brightened( m_highlightFactor ) : it_hi->second;
        }
        else
        {
            auto it_dark = m_layerColorsDark.find( aLayer );
            color = it_dark == m_layerColorsDark.end() ? color.Darkened( 1.0 - m_highlightFactor ) : it_dark->second;
        }
    }
 
    // Apply high-contrast dimming
    if( m_hiContrastEnabled && m_highContrastLayers.size() && !highlighted && !selected )
    {
        PCB_LAYER_ID primary = GetPrimaryHighContrastLayer();
        bool         isActive = m_highContrastLayers.count( aLayer );
        bool         hide = false;
 
        switch( originalLayer )
        {
        case LAYER_PADS:
        {
            const PAD* pad = static_cast<const PAD*>( aItem );
 
            if( pad->IsOnLayer( primary ) && !pad->FlashLayer( primary ) )
            {
                isActive = false;
 
                if( IsCopperLayer( primary ) )
                    hide = true;
            }
 
            if( m_PadEditModePad && pad != m_PadEditModePad )
                isActive = false;
 
            break;
        }
 
        case LAYER_VIA_BLIND:
        case LAYER_VIA_BURIED:
        case LAYER_VIA_MICROVIA:
        {
            const PCB_VIA* via = static_cast<const PCB_VIA*>( aItem );
 
            // Target graphic is active if the via crosses the primary layer
            if( via->GetLayerSet().test( primary ) == 0 )
            {
                isActive = false;
                hide = true;
            }
 
            break;
        }
 
        case LAYER_VIA_THROUGH:
        {
            const PCB_VIA* via = static_cast<const PCB_VIA*>( aItem );
 
            if( !via->FlashLayer( primary ) )
            {
                isActive = false;
 
                if( IsCopperLayer( primary ) )
                    hide = true;
            }
 
            break;
        }
 
        case LAYER_PAD_PLATEDHOLES:
        case LAYER_PAD_HOLEWALLS:
        case LAYER_NON_PLATEDHOLES:
            // Pad holes are active is any physical layer is active
            if( LSET::PhysicalLayersMask().test( primary ) == 0 )
                isActive = false;
 
            break;
 
        case LAYER_VIA_HOLES:
        case LAYER_VIA_HOLEWALLS:
        {
            const PCB_VIA* via = static_cast<const PCB_VIA*>( aItem );
 
            if( via->GetViaType() == VIATYPE::THROUGH )
            {
                // A through via's hole is active if any physical layer is active
                if( LSET::PhysicalLayersMask().test( primary ) == 0 )
                    isActive = false;
            }
            else
            {
                // A blind/buried or micro via's hole is active if it crosses the primary layer
                if( via->GetLayerSet().test( primary ) == 0 )
                    isActive = false;
            }
 
            break;
        }
 
        case LAYER_DRC_ERROR:
        case LAYER_DRC_WARNING:
        case LAYER_DRC_EXCLUSION:
            isActive = true;
            break;
 
        default:
            break;
        }
 
        if( !isActive )
        {
            // Graphics on Edge_Cuts layer are not fully dimmed or hidden because they are
            // useful when working on another layer
            // We could use a dim factor = m_hiContrastFactor, but to have a sufficient
            // contrast whenever m_hiContrastFactor value, we clamp the factor to 0.3f
            // (arbitray choice after tests)
            float dim_factor_Edge_Cuts = std::max( m_hiContrastFactor, 0.3f );
 
            if( m_ContrastModeDisplay == HIGH_CONTRAST_MODE::HIDDEN
                || IsNetnameLayer( aLayer )
                || hide )
            {
                if( originalLayer == Edge_Cuts )
                {
                    it = m_layerColors.find( LAYER_PCB_BACKGROUND );
 
                    if( it != m_layerColors.end() )
                        color = color.Mix( it->second, dim_factor_Edge_Cuts );
                    else
                        color = color.Mix( COLOR4D::BLACK, dim_factor_Edge_Cuts );
                }
                else
                    color = COLOR4D::CLEAR;
            }
            else
            {
                it = m_layerColors.find( LAYER_PCB_BACKGROUND );
                COLOR4D backgroundColor = it == m_layerColors.end() ? COLOR4D::BLACK : it->second;
 
                if( originalLayer == Edge_Cuts )
                    color = color.Mix( backgroundColor, dim_factor_Edge_Cuts );
                else
                    color = color.Mix( backgroundColor, m_hiContrastFactor );
 
                // Reference images can't have their color mixed so just reduce the opacity a bit
                // so they show through less
                if( aItem->Type() == PCB_REFERENCE_IMAGE_T )
                    color.a *= m_hiContrastFactor;
            }
        }
    }
    else if( originalLayer == LAYER_VIA_BLIND
          || originalLayer == LAYER_VIA_BURIED
          || originalLayer == LAYER_VIA_MICROVIA )
    {
        const PCB_VIA* via = static_cast<const PCB_VIA*>( aItem );
        const BOARD*   board = via->GetBoard();
        LSET           visibleLayers = board->GetVisibleLayers() & board->GetEnabledLayers();
 
        // Target graphic is visible if the via crosses a visible layer
        if( ( via->GetLayerSet() & visibleLayers ).none() )
            color = COLOR4D::CLEAR;
    }
 
    // Apply per-type opacity overrides
    if( aItem->Type() == PCB_TRACE_T || aItem->Type() == PCB_ARC_T )
        color.a *= m_trackOpacity;
    else if( aItem->Type() == PCB_VIA_T )
        color.a *= m_viaOpacity;
    else if( aItem->Type() == PCB_PAD_T )
        color.a *= m_padOpacity;
    else if( aItem->Type() == PCB_ZONE_T && static_cast<const ZONE*>( aItem )->IsTeardropArea() )
        color.a *= m_trackOpacity;
    else if( aItem->Type() == PCB_ZONE_T )
        color.a *= m_zoneOpacity;
    else if( aItem->Type() == PCB_REFERENCE_IMAGE_T )
        color.a *= m_imageOpacity;
    else if( aItem->Type() == PCB_SHAPE_T && static_cast<const PCB_SHAPE*>( aItem )->IsAnyFill() )
        color.a *= m_filledShapeOpacity;
    else if( aItem->Type() == PCB_SHAPE_T && aItem->IsOnCopperLayer() )
        color.a *= m_trackOpacity;
 
    if( aItem->GetForcedTransparency() > 0.0 )
        color = color.WithAlpha( color.a * ( 1.0 - aItem->GetForcedTransparency() ) );
 
    // No special modifiers enabled
    return color;
}
 
 
bool PCB_RENDER_SETTINGS::GetShowPageLimits() const
{
    return pcbconfig() && pcbconfig()->m_ShowPageLimits;
}
 
 
PCB_PAINTER::PCB_PAINTER( GAL* aGal, FRAME_T aFrameType ) :
    PAINTER( aGal ),
    m_frameType( aFrameType ),
    m_maxError( ARC_HIGH_DEF ),
    m_holePlatingThickness( 0 ),
    m_lockedShadowMargin( 0 )
{
}
 
 
int PCB_PAINTER::getLineThickness( int aActualThickness ) const
{
    // if items have 0 thickness, draw them with the outline
    // width, otherwise respect the set value (which, no matter
    // how small will produce something)
    if( aActualThickness == 0 )
        return KiROUND( m_pcbSettings.m_outlineWidth );
 
    return aActualThickness;
}
 
 
PAD_DRILL_SHAPE PCB_PAINTER::getDrillShape( const PAD* aPad ) const
{
    return aPad->GetDrillShape();
}
 
 
SHAPE_SEGMENT PCB_PAINTER::getPadHoleShape( const PAD* aPad ) const
{
    SHAPE_SEGMENT segm = *aPad->GetEffectiveHoleShape();
    return segm;
}
 
 
int PCB_PAINTER::getViaDrillSize( const PCB_VIA* aVia ) const
{
    return aVia->GetDrillValue();
}
 
 
bool PCB_PAINTER::Draw( const VIEW_ITEM* aItem, int aLayer )
{
    if( !aItem->IsBOARD_ITEM() )
        return false;
 
    const BOARD_ITEM* item = static_cast<const BOARD_ITEM*>( aItem );
 
    if( const BOARD* board = item->GetBoard() )
    {
        BOARD_DESIGN_SETTINGS& bds = board->GetDesignSettings();
        m_maxError = bds.m_MaxError;
        m_holePlatingThickness = bds.GetHolePlatingThickness();
        m_lockedShadowMargin = bds.GetLineThickness( F_SilkS ) * 4;
 
        if( item->GetParentFootprint() && !board->IsFootprintHolder() )
        {
            FOOTPRINT* parentFP = item->GetParentFootprint();
 
            // Never draw footprint reference images on board
            if( item->Type() == PCB_REFERENCE_IMAGE_T )
            {
                return false;
            }
            else if( item->GetLayerSet().count() > 1 )
            {
                // For multi-layer objects, exclude only those layers that are private
                if( IsPcbLayer( aLayer ) && parentFP->GetPrivateLayers().test( aLayer ) )
                    return false;
            }
            else if( item->GetLayerSet().count() == 1 )
            {
                // For single-layer objects, exclude all layers including ancillary layers
                // such as holes, netnames, etc.
                PCB_LAYER_ID singleLayer = item->GetLayerSet().ExtractLayer();
 
                if( parentFP->GetPrivateLayers().test( singleLayer ) )
                    return false;
            }
        }
    }
    else
    {
        m_maxError = ARC_HIGH_DEF;
        m_holePlatingThickness = 0;
    }
 
    // the "cast" applied in here clarifies which overloaded draw() is called
    switch( item->Type() )
    {
    case PCB_TRACE_T:
        draw( static_cast<const PCB_TRACK*>( item ), aLayer );
        break;
 
    case PCB_ARC_T:
        draw( static_cast<const PCB_ARC*>( item ), aLayer );
        break;
 
    case PCB_VIA_T:
        if( IsDrillSymbolLayer( aLayer ) )
            drawDrillSymbol( item, aLayer );
        else
            draw( static_cast<const PCB_VIA*>( item ), aLayer );
 
        break;
 
    case PCB_PAD_T:
        if( IsDrillSymbolLayer( aLayer ) )
            drawDrillSymbol( item, aLayer );
        else
            draw( static_cast<const PAD*>( item ), aLayer );
 
        break;
 
    case PCB_SHAPE_T:
        draw( static_cast<const PCB_SHAPE*>( item ), aLayer );
        break;
 
    case PCB_REFERENCE_IMAGE_T:
        draw( static_cast<const PCB_REFERENCE_IMAGE*>( item ), aLayer );
        break;
 
    case PCB_FIELD_T:
        draw( static_cast<const PCB_FIELD*>( item ), aLayer );
        break;
 
    case PCB_TEXT_T:
        draw( static_cast<const PCB_TEXT*>( item ), aLayer );
        break;
 
    case PCB_TEXTBOX_T:
        draw( static_cast<const PCB_TEXTBOX*>( item ), aLayer );
        break;
 
    case PCB_TABLE_T:
        draw( static_cast<const PCB_TABLE*>( item ), aLayer );
        break;
 
    case PCB_DRILL_CHART_T:
    {
        const PCB_DRILL_CHART* chart = static_cast<const PCB_DRILL_CHART*>( item );
 
        // Before the table, whose selection wash is drawn last and would otherwise bury the
        // marks the way it does not bury the cell text
        drawChartSymbols( chart, aLayer );
        draw( static_cast<const PCB_TABLE*>( item ), aLayer );
        break;
    }
 
    case PCB_DRILL_MAP_T:
        draw( static_cast<const PCB_DRILL_MAP*>( item ), aLayer );
        break;
 
    case PCB_FOOTPRINT_T:
        draw( static_cast<const FOOTPRINT*>( item ), aLayer );
        break;
 
    case PCB_GROUP_T:
        draw( static_cast<const PCB_GROUP*>( item ), aLayer );
        break;
 
    case PCB_ZONE_T:
        draw( static_cast<const ZONE*>( item ), aLayer );
        break;
 
    case PCB_DIM_ALIGNED_T:
    case PCB_DIM_CENTER_T:
    case PCB_DIM_RADIAL_T:
    case PCB_DIM_ORTHOGONAL_T:
    case PCB_DIM_LEADER_T:
        draw( static_cast<const PCB_DIMENSION_BASE*>( item ), aLayer );
        break;
 
    case PCB_BARCODE_T:
        draw( static_cast<const PCB_BARCODE*>( item ), aLayer );
        break;
 
    case PCB_TARGET_T:
        draw( static_cast<const PCB_TARGET*>( item ) );
        break;
 
    case PCB_POINT_T:
        draw( static_cast<const PCB_POINT*>( item ), aLayer );
        break;
 
    case PCB_GRID_ITEM_T:
        draw( static_cast<const PCB_GRID_ITEM*>( item ), aLayer );
        break;
 
    case PCB_MARKER_T:
        draw( static_cast<const PCB_MARKER*>( item ), aLayer );
        break;
 
    case PCB_BOARD_OUTLINE_T:
        draw( static_cast<const PCB_BOARD_OUTLINE*>( item ), aLayer );
        break;
 
    default:
        // Painter does not know how to draw the object
        return false;
    }
 
    // Draw bounding boxes after drawing objects so they can be seen.
    if( m_pcbSettings.GetDrawBoundingBoxes() )
    {
        // Show bounding boxes of painted objects for debugging.
        BOX2I box = item->GetBoundingBox();
 
        m_gal->SetIsFill( false );
        m_gal->SetIsStroke( true );
 
        if( item->Type() == PCB_FOOTPRINT_T )
            m_gal->SetStrokeColor( item->IsSelected() ? COLOR4D( 1.0, 0.2, 0.2, 1 ) : COLOR4D( MAGENTA ) );
        else
            m_gal->SetStrokeColor( item->IsSelected() ? COLOR4D( 1.0, 0.2, 0.2, 1 ) : COLOR4D( 0.4, 0.4, 0.4, 1 ) );
 
        m_gal->SetLineWidth( 1 );
        m_gal->DrawRectangle( box.GetOrigin(), box.GetEnd() );
 
        if( item->Type() == PCB_FOOTPRINT_T )
        {
            m_gal->SetStrokeColor( item->IsSelected() ? COLOR4D( 1.0, 0.2, 0.2, 1 ) : COLOR4D( CYAN ) );
 
            const FOOTPRINT* fp = static_cast<const FOOTPRINT*>( item );
 
            if( fp )
            {
                const SHAPE_POLY_SET& convex = fp->GetBoundingHull();
 
                m_gal->DrawPolyline( convex.COutline( 0 ) );
            }
        }
    }
 
    return true;
}
 
 
void PCB_PAINTER::draw( const PCB_TRACK* aTrack, int aLayer )
{
    VECTOR2I start( aTrack->GetStart() );
    VECTOR2I end( aTrack->GetEnd() );
    int      track_width = aTrack->GetWidth();
    COLOR4D  color       = m_pcbSettings.GetColor( aTrack, aLayer );
 
    // If a chain highlight is active and the track belongs to the highlighted
    // chain, and the chain has a colour override configured on the board,
    // prefer that colour.  Only do this when we're drawing the actual copper
    // (not netname labels, clearance outlines, etc.).
    if( IsCopperLayer( aLayer ) && !m_pcbSettings.m_highlightedNetChain.IsEmpty() )
    {
        if( NETINFO_ITEM* netinfo = aTrack->GetNet() )
        {
            if( netinfo->GetNetChain() == m_pcbSettings.m_highlightedNetChain )
            {
                if( const BOARD* board = aTrack->GetBoard() )
                {
                    COLOR4D chainColor = board->GetNetChainColor( m_pcbSettings.m_highlightedNetChain );
 
                    if( chainColor != COLOR4D::UNSPECIFIED )
                        color = chainColor.WithAlpha( color.a );
                }
            }
        }
    }
 
    if( IsNetnameLayer( aLayer ) )
    {
        if( !pcbconfig() || pcbconfig()->m_Display.m_NetNames < 2 )
            return;
 
        if( aTrack->GetNetCode() <= NETINFO_LIST::UNCONNECTED )
            return;
 
        SHAPE_SEGMENT trackShape( { aTrack->GetStart(), aTrack->GetEnd() }, aTrack->GetWidth() );
        renderNetNameForSegment( trackShape, color, aTrack->GetDisplayNetname() );
        return;
    }
    else if( IsCopperLayer( aLayer ) || IsSolderMaskLayer( aLayer ) || aLayer == LAYER_LOCKED_ITEM_SHADOW )
    {
        // Draw a regular track
        bool outline_mode = pcbconfig()
                            && !pcbconfig()->m_Display.m_DisplayPcbTrackFill
                            && aLayer != LAYER_LOCKED_ITEM_SHADOW;
        m_gal->SetStrokeColor( color );
        m_gal->SetFillColor( color );
        m_gal->SetIsStroke( outline_mode );
        m_gal->SetIsFill( not outline_mode );
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
 
        if( IsSolderMaskLayer( aLayer ) )
            track_width = track_width + aTrack->GetSolderMaskExpansion() * 2;
 
        if( aLayer == LAYER_LOCKED_ITEM_SHADOW )
            track_width = track_width + m_lockedShadowMargin;
 
        m_gal->DrawSegment( start, end, track_width );
    }
 
    // Clearance lines
    if( IsClearanceLayer( aLayer )
            && pcbconfig()
            && pcbconfig()->m_Display.m_TrackClearance == SHOW_WITH_VIA_ALWAYS
            && !m_pcbSettings.m_isPrinting )
    {
        const PCB_LAYER_ID copperLayerForClearance = ToLAYER_ID( aLayer - LAYER_CLEARANCE_START );
 
        int clearance = aTrack->GetOwnClearance( copperLayerForClearance );
 
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
        m_gal->SetIsFill( false );
        m_gal->SetIsStroke( true );
        m_gal->SetStrokeColor( color );
        m_gal->DrawSegment( start, end, track_width + clearance * 2 );
    }
}
 
 
void PCB_PAINTER::renderNetNameForSegment( const SHAPE_SEGMENT& aSeg, const COLOR4D& aColor,
                                           const wxString& aNetName ) const
{
    // When drawing netnames, clip the track to the viewport
    BOX2D             viewport;
    VECTOR2D          screenSize = m_gal->GetScreenPixelSize();
    const MATRIX3x3D& matrix = m_gal->GetScreenWorldMatrix();
 
    viewport.SetOrigin( VECTOR2D( matrix * VECTOR2D( 0, 0 ) ) );
    viewport.SetEnd( VECTOR2D( matrix * screenSize ) );
    viewport.Normalize();
 
    int num_char = (int) aNetName.size();
 
    // Check if the track is long enough to have a netname displayed
    int         seg_minlength = aSeg.GetWidth() * num_char;
    SEG::ecoord seg_minlength_sq = (SEG::ecoord)seg_minlength * seg_minlength;
 
    if( aSeg.GetSeg().SquaredLength() < seg_minlength_sq )
        return;
 
    double    textSize = aSeg.GetWidth();
    double    penWidth = textSize / 12.0;
    EDA_ANGLE textOrientation;
    int num_names = 1;
 
    VECTOR2I start = aSeg.GetSeg().A;
    VECTOR2I end   = aSeg.GetSeg().B;
    VECTOR2D segV  = end - start;
 
    if( end.y == start.y ) // horizontal
    {
        textOrientation = ANGLE_HORIZONTAL;
        num_names = std::max( num_names, KiROUND( aSeg.GetSeg().Length() / viewport.GetWidth() ) );
    }
    else if( end.x == start.x ) // vertical
    {
        textOrientation = ANGLE_VERTICAL;
        num_names = std::max( num_names, KiROUND( aSeg.GetSeg().Length() / viewport.GetHeight() ) );
    }
    else
    {
        textOrientation = -EDA_ANGLE( segV );
        textOrientation.Normalize90();
 
        double min_size = std::min( viewport.GetWidth(), viewport.GetHeight() );
        num_names = std::max( num_names, KiROUND( aSeg.GetSeg().Length() / ( M_SQRT2 * min_size ) ) );
    }
 
    m_gal->SetIsStroke( true );
    m_gal->SetIsFill( false );
    m_gal->SetStrokeColor( aColor );
    m_gal->SetLineWidth( penWidth );
    m_gal->SetFontBold( false );
    m_gal->SetFontItalic( false );
    m_gal->SetFontUnderlined( false );
    m_gal->SetTextMirrored( false );
    m_gal->SetGlyphSize( VECTOR2D( textSize * 0.55, textSize * 0.55 ) );
    m_gal->SetHorizontalJustify( GR_TEXT_H_ALIGN_CENTER );
    m_gal->SetVerticalJustify( GR_TEXT_V_ALIGN_CENTER );
 
    int divisions = num_names + 1;
 
    for( int ii = 1; ii < divisions; ++ii )
    {
        VECTOR2I textPosition = start + segV * ( (double) ii / divisions );
 
        if( viewport.Contains( textPosition ) )
            m_gal->BitmapText( aNetName, textPosition, textOrientation );
    }
}
 
 
void PCB_PAINTER::draw( const PCB_ARC* aArc, int aLayer )
{
    VECTOR2D  center( aArc->GetCenter() );
    int       width = aArc->GetWidth();
    COLOR4D   color = m_pcbSettings.GetColor( aArc, aLayer );
    double    radius = aArc->GetRadius();
    EDA_ANGLE start_angle = aArc->GetArcAngleStart();
    EDA_ANGLE angle = aArc->GetAngle();
 
    // GetRadius() clamps a runaway centre but GetCenter() does not, thus the two disagree and
    // the copper draws far from the track.  The plotter substitutes the chord for this reason
    bool degenerate = aArc->IsDegenerated( 10 /* in IU */ );
 
    if( IsNetnameLayer( aLayer ) )
    {
        if( !pcbconfig() || pcbconfig()->m_Display.m_NetNames < 2 )
            return;
 
        if( aArc->GetNetCode() <= NETINFO_LIST::UNCONNECTED )
            return;
 
        const wxString& netname = aArc->GetDisplayNetname();
 
        if( netname.IsEmpty() )
            return;
 
        // Radius and centre disagree here, thus the arc length and the tangent are meaningless
        if( degenerate )
        {
            const SHAPE_SEGMENT chord( { aArc->GetStart(), aArc->GetEnd() }, width );
            renderNetNameForSegment( chord, color, netname );
            return;
        }
 
        // Arc length must accommodate the label width.
        double arcLen = std::abs( radius * angle.AsRadians() );
 
        if( arcLen < (double) width * (double) netname.size() )
            return;
 
        // Tangent at the arc midpoint is perpendicular to the radius there.
        VECTOR2I  midPt = aArc->GetMid();
        VECTOR2D  radial = VECTOR2D( midPt ) - center;
        EDA_ANGLE textOrientation( VECTOR2D( -radial.y, radial.x ) );
        textOrientation = -textOrientation;
        textOrientation.Normalize90();
 
        double textSize = width;
        double penWidth = textSize / 12.0;
 
        m_gal->SetIsStroke( true );
        m_gal->SetIsFill( false );
        m_gal->SetStrokeColor( color );
        m_gal->SetLineWidth( penWidth );
        m_gal->SetFontBold( false );
        m_gal->SetFontItalic( false );
        m_gal->SetFontUnderlined( false );
        m_gal->SetTextMirrored( false );
        m_gal->SetGlyphSize( VECTOR2D( textSize * 0.55, textSize * 0.55 ) );
        m_gal->SetHorizontalJustify( GR_TEXT_H_ALIGN_CENTER );
        m_gal->SetVerticalJustify( GR_TEXT_V_ALIGN_CENTER );
 
        m_gal->BitmapText( netname, midPt, textOrientation );
        return;
    }
    else if( IsCopperLayer( aLayer ) || IsSolderMaskLayer( aLayer ) || aLayer == LAYER_LOCKED_ITEM_SHADOW )
    {
        // Draw a regular track
        bool outline_mode = pcbconfig()
                            && !pcbconfig()->m_Display.m_DisplayPcbTrackFill
                            && aLayer != LAYER_LOCKED_ITEM_SHADOW;
        m_gal->SetStrokeColor( color );
        m_gal->SetFillColor( color );
        m_gal->SetIsStroke( outline_mode );
        m_gal->SetIsFill( not outline_mode );
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
 
        if( IsSolderMaskLayer( aLayer ) )
            width = width + aArc->GetSolderMaskExpansion() * 2;
 
        if( aLayer == LAYER_LOCKED_ITEM_SHADOW )
            width = width + m_lockedShadowMargin;
 
        if( degenerate )
            m_gal->DrawSegment( aArc->GetStart(), aArc->GetEnd(), width );
        else
            m_gal->DrawArcSegment( center, radius, start_angle, angle, width, m_maxError );
    }
 
    // Clearance lines
    if( IsClearanceLayer( aLayer )
            && pcbconfig() && pcbconfig()->m_Display.m_TrackClearance == SHOW_WITH_VIA_ALWAYS
            && !m_pcbSettings.m_isPrinting )
    {
        /*
         * Showing the clearance area is not obvious for optionally-flashed pads and vias, so we
         * choose to not display clearance lines at all on non-copper active layers.  We follow
         * the same rule for tracks to be consistent (even though they don't have the same issue).
         */
        const PCB_LAYER_ID activeLayer = m_pcbSettings.GetActiveLayer();
        const BOARD&       board = *aArc->GetBoard();
 
        if( IsCopperLayer( activeLayer ) && board.GetVisibleLayers().test( activeLayer ) )
        {
            int clearance = aArc->GetOwnClearance( activeLayer );
 
            m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
            m_gal->SetIsFill( false );
            m_gal->SetIsStroke( true );
            m_gal->SetStrokeColor( color );
 
            if( degenerate )
                m_gal->DrawSegment( aArc->GetStart(), aArc->GetEnd(), width + clearance * 2 );
            else
                m_gal->DrawArcSegment( center, radius, start_angle, angle, width + clearance * 2, m_maxError );
        }
    }
 
#if 0
    // Debug only: enable this code only to test the TransformArcToPolygon function and display the polygon
    // outline created by it.
    // arcs on F_Cu are approximated with ERROR_INSIDE, others with ERROR_OUTSIDE
    SHAPE_POLY_SET cornerBuffer;
    ERROR_LOC errorloc = aLayer == F_Cu ? ERROR_LOC::ERROR_INSIDE : ERROR_LOC::ERROR_OUTSIDE;
    TransformArcToPolygon( cornerBuffer, aArc->GetStart(), aArc->GetMid(), aArc->GetEnd(), width,
                           m_maxError, errorloc );
    m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
    m_gal->SetIsFill( false );
    m_gal->SetIsStroke( true );
    m_gal->SetStrokeColor( COLOR4D( 0, 0, 1.0, 1.0 ) );
    m_gal->DrawPolygon( cornerBuffer );
#endif
 
#if 0
    // Debug only: enable this code only to test the arc geometry.
    // Draw 3 lines from arc center to arc start, arc middle, arc end to show how the arc is defined
    SHAPE_ARC arc( aArc->GetStart(), aArc->GetMid(), aArc->GetEnd(), m_pcbSettings.m_outlineWidth );
    m_gal->SetIsFill( false );
    m_gal->SetIsStroke( true );
    m_gal->SetStrokeColor( COLOR4D( 0, 0, 1.0, 1.0 ) );
    m_gal->DrawSegment( arc.GetStart(), arc.GetCenter(), m_pcbSettings.m_outlineWidth );
    m_gal->DrawSegment( aArc->GetFocusPosition(), arc.GetCenter(), m_pcbSettings.m_outlineWidth );
    m_gal->DrawSegment( arc.GetEnd(), arc.GetCenter(), m_pcbSettings.m_outlineWidth );
#endif
 
#if 0
    // Debug only: enable this code only to test the SHAPE_ARC::ConvertToPolyline function and display the
    // polyline created by it.
    SHAPE_ARC arc( aArc->GetCenter(), aArc->GetStart(), aArc->GetAngle(), aArc->GetWidth() );
    SHAPE_LINE_CHAIN arcSpine = arc.ConvertToPolyline( m_maxError );
    m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
    m_gal->SetIsFill( false );
    m_gal->SetIsStroke( true );
    m_gal->SetStrokeColor( COLOR4D( 0.3, 0.2, 0.5, 1.0 ) );
 
    for( int idx = 1; idx < arcSpine.PointCount(); idx++ )
        m_gal->DrawSegment( arcSpine.CPoint( idx-1 ), arcSpine.CPoint( idx ), aArc->GetWidth() );
#endif
}
 
 
static bool viaHoleShowsLayerPair( const PCB_VIA* aVia )
{
    PCB_LAYER_ID layerTop, layerBottom;
    aVia->LayerPair( &layerTop, &layerBottom );
 
    return aVia->GetViaType() == VIATYPE::BLIND || aVia->GetViaType() == VIATYPE::BURIED
           || ( aVia->GetViaType() == VIATYPE::MICROVIA && ( layerTop != F_Cu || layerBottom != B_Cu ) );
}
 
 
bool PCB_PAINTER::HasUniformColor( const VIEW_ITEM* aItem, int aLayer ) const
{
    if( aLayer != LAYER_VIA_HOLES && aLayer != LAYER_VIA_HOLEWALLS && aLayer != LAYER_PAD_HOLEWALLS )
        return true;
 
    if( !aItem->IsBOARD_ITEM() )
        return true;
 
    const BOARD_ITEM* item = static_cast<const BOARD_ITEM*>( aItem );
 
    if( aLayer == LAYER_PAD_HOLEWALLS )
    {
        if( item->Type() != PCB_PAD_T )
            return true;
 
        const PAD* pad = static_cast<const PAD*>( item );
 
        return pad->GetDrillSizeX() <= 0 || ( pad->GetSecondaryDrillSizeX() <= 0 && pad->GetTertiaryDrillSizeX() <= 0 );
    }
 
    if( item->Type() != PCB_VIA_T )
        return true;
 
    const PCB_VIA* via = static_cast<const PCB_VIA*>( item );
 
    if( aLayer == LAYER_VIA_HOLES )
        return !viaHoleShowsLayerPair( via );
 
    return via->GetSecondaryDrillSize().value_or( 0 ) <= 0 && via->GetTertiaryDrillSize().value_or( 0 ) <= 0;
}
 
 
void PCB_PAINTER::draw( const PCB_VIA* aVia, int aLayer )
{
    const BOARD* board = aVia->GetBoard();
    COLOR4D      color = m_pcbSettings.GetColor( aVia, aLayer );
    VECTOR2D     center( aVia->GetStart() );
 
    // draw hidden vias transparent not skipped so a recolour restores them without re-tessellating
 
    // Chain highlight colour override for copper/hole layers.
    if( board && !m_pcbSettings.m_highlightedNetChain.IsEmpty()
        && ( IsCopperLayer( aLayer ) || IsViaCopperLayer( aLayer )
             || aLayer == LAYER_VIA_HOLES ) )
    {
        if( NETINFO_ITEM* netinfo = aVia->GetNet() )
        {
            if( netinfo->GetNetChain() == m_pcbSettings.m_highlightedNetChain )
            {
                COLOR4D chainColor = board->GetNetChainColor( m_pcbSettings.m_highlightedNetChain );
 
                if( chainColor != COLOR4D::UNSPECIFIED )
                    color = chainColor.WithAlpha( color.a );
            }
        }
    }
 
    const int copperLayer = IsViaCopperLayer( aLayer ) ? aLayer - LAYER_VIA_COPPER_START : aLayer;
 
    PCB_LAYER_ID currentLayer = ToLAYER_ID( copperLayer );
    PCB_LAYER_ID layerTop, layerBottom;
    aVia->LayerPair( &layerTop, &layerBottom );
 
    // Blind/buried vias (and microvias) will use different hole and label rendering
    bool isBlindBuried = viaHoleShowsLayerPair( aVia );
 
    // Draw description layer
    if( IsNetnameLayer( aLayer ) )
    {
        VECTOR2D position( center );
 
        // Is anything that we can display enabled (netname and/or layers ids)?
        bool showNets =  pcbconfig() && pcbconfig()->m_Display.m_NetNames != 0
                         && !aVia->GetNetname().empty();
        bool showLayers = aVia->GetViaType() != VIATYPE::THROUGH;
 
        if( !showNets && !showLayers )
            return;
 
        double maxSize = PCB_RENDER_SETTINGS::MAX_FONT_SIZE;
        double size = aVia->GetWidth( currentLayer );
 
        // Font size limits
        if( size > maxSize )
            size = maxSize;
 
        m_gal->Save();
        m_gal->Translate( position );
 
        // Default font settings
        m_gal->ResetTextAttributes();
        m_gal->SetHorizontalJustify( GR_TEXT_H_ALIGN_CENTER );
        m_gal->SetVerticalJustify( GR_TEXT_V_ALIGN_CENTER );
        m_gal->SetFontBold( false );
        m_gal->SetFontItalic( false );
        m_gal->SetFontUnderlined( false );
        m_gal->SetTextMirrored( false );
        m_gal->SetStrokeColor( m_pcbSettings.GetColor( aVia, aLayer ) );
        m_gal->SetIsStroke( true );
        m_gal->SetIsFill( false );
 
        // Set the text position via position. if only one text, it is on the via position
        // For 2 lines, the netname is slightly below the center, and the layer IDs above
        // the netname
        VECTOR2D textpos( 0.0, 0.0 );
 
        const wxString& netname = aVia->GetDisplayNetname();
 
        PCB_LAYER_ID topLayerId = aVia->TopLayer();
        PCB_LAYER_ID bottomLayerId = aVia->BottomLayer();
        int          topLayer;       // The via top layer number (from 1 to copper layer count)
        int          bottomLayer;    // The via bottom layer number (from 1 to copper layer count)
 
        switch( topLayerId )
        {
        case F_Cu: topLayer = 1;                            break;
        case B_Cu: topLayer = board->GetCopperLayerCount(); break;
        default:   topLayer = (topLayerId - B_Cu)/2 + 1;    break;
        }
 
        switch( bottomLayerId )
        {
        case F_Cu: bottomLayer = 1;                            break;
        case B_Cu: bottomLayer = board->GetCopperLayerCount(); break;
        default:   bottomLayer = (bottomLayerId - B_Cu)/2 + 1; break;
        }
 
        wxString layerIds;
#if wxUSE_UNICODE_WCHAR
        layerIds << std::to_wstring( topLayer ) << L'-' << std::to_wstring( bottomLayer );
#else
        layerIds << std::to_string( topLayer ) << '-' << std::to_string( bottomLayer );
#endif
 
        // a good size is set room for at least 6 chars, to be able to print 2 lines of text,
        // or at least 3 chars for only the netname
        // (The layerIds string has 5 chars max)
        int minCharCnt = showLayers ? 6 : 3;
 
        // approximate the size of netname and layerIds text:
        double tsize = 1.5 * size / std::max( PrintableCharCount( netname ), minCharCnt );
        tsize = std::min( tsize, size );
 
        // Use a smaller text size to handle interline, pen size..
        tsize *= 0.75;
        VECTOR2D namesize( tsize, tsize );
 
        // For 2 lines, adjust the text pos (move it a small amount to the bottom)
        if( showLayers && showNets )
            textpos.y += ( tsize * 1.3 )/ 2;
 
        m_gal->SetGlyphSize( namesize );
        m_gal->SetLineWidth( namesize.x / 10.0 );
 
        if( showNets )
            m_gal->BitmapText( netname, textpos, ANGLE_HORIZONTAL );
 
        if( showLayers )
        {
            if( showNets )
                textpos.y -= tsize * 1.3;
 
            m_gal->BitmapText( layerIds, textpos, ANGLE_HORIZONTAL );
        }
 
        m_gal->Restore();
 
        return;
    }
 
    bool outline_mode = pcbconfig() && !pcbconfig()->m_Display.m_DisplayViaFill;
 
    m_gal->SetStrokeColor( color );
    m_gal->SetFillColor( color );
    m_gal->SetIsStroke( true );
    m_gal->SetIsFill( false );
 
    if( outline_mode )
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
 
    if( aLayer == LAYER_VIA_HOLEWALLS )
    {
        double thickness =
            m_holePlatingThickness * ADVANCED_CFG::GetCfg().m_HoleWallPaintingMultiplier;
        double drillRadius = getViaDrillSize( aVia ) / 2.0;
        double maxRadius = aVia->GetWidth( layerTop ) / 2.0;
        double radius = drillRadius + thickness;
 
        // Clamp the hole wall so it doesn't extend beyond the via's copper
        if( radius > maxRadius )
        {
            radius = maxRadius;
            thickness = radius - drillRadius;
        }
 
        if( thickness <= 0 )
            return;
 
        if( !outline_mode )
        {
            m_gal->SetLineWidth( thickness );
            radius -= thickness / 2.0;
        }
 
        // Underpaint the hole so that there aren't artifacts at its edge
        m_gal->SetIsFill( true );
 
        m_gal->DrawCircle( center, radius );
 
        // Draw backdrill indicators (semi-circles extending into the hole) on top of the
        // hole wall so they remain visible regardless of layer rendering order
        if( !m_pcbSettings.IsPrinting() )
        {
            std::optional<int> secDrill = aVia->GetSecondaryDrillSize();
            std::optional<int> terDrill = aVia->GetTertiaryDrillSize();
 
            if( secDrill.value_or( 0 ) > 0 )
            {
                drawBackdrillIndicator( aVia, center, *secDrill, aVia->GetSecondaryDrillStartLayer(),
                                        aVia->GetSecondaryDrillEndLayer() );
            }
 
            if( terDrill.value_or( 0 ) > 0 )
            {
                drawBackdrillIndicator( aVia, center, *terDrill, aVia->GetTertiaryDrillStartLayer(),
                                        aVia->GetTertiaryDrillEndLayer() );
            }
        }
    }
    else if( aLayer == LAYER_VIA_HOLES )
    {
        double radius = getViaDrillSize( aVia ) / 2.0;
 
        m_gal->SetIsStroke( false );
        m_gal->SetIsFill( true );
 
        if( isBlindBuried && !m_pcbSettings.IsPrinting() )
        {
            m_gal->SetIsStroke( false );
            m_gal->SetIsFill( true );
 
            m_gal->SetFillColor( m_pcbSettings.GetColor( aVia, layerTop ) );
            m_gal->DrawArc( center, radius, EDA_ANGLE( 180, DEGREES_T ), EDA_ANGLE( 180, DEGREES_T ) );
 
            m_gal->SetFillColor( m_pcbSettings.GetColor( aVia, layerBottom ) );
            m_gal->DrawArc( center, radius, EDA_ANGLE( 0, DEGREES_T ), EDA_ANGLE( 180, DEGREES_T ) );
        }
        else
        {
            m_gal->DrawCircle( center, radius );
        }
 
    }
    else if( ( aLayer == F_Mask && aVia->IsOnLayer( F_Mask ) )
             || ( aLayer == B_Mask && aVia->IsOnLayer( B_Mask ) ) )
    {
        int margin = board->GetDesignSettings().m_SolderMaskExpansion;
 
        m_gal->SetIsFill( true );
        m_gal->SetIsStroke( false );
 
        m_gal->SetLineWidth( margin );
        m_gal->DrawCircle( center, aVia->GetWidth( currentLayer ) / 2.0 + margin );
    }
    else if( m_pcbSettings.IsPrinting() || IsCopperLayer( currentLayer ) )
    {
        int    annular_width = KiROUND( ( aVia->GetWidth( currentLayer ) - getViaDrillSize( aVia ) ) / 2.0 );
        double radius = aVia->GetWidth( currentLayer ) / 2.0;
        bool   draw = false;
 
        if( m_pcbSettings.IsPrinting() )
        {
            draw = aVia->FlashLayer( m_pcbSettings.GetPrintLayers() );
        }
        else if( aVia->IsSelected() )
        {
            draw = true;
        }
        else if( aVia->FlashLayer( board->GetVisibleLayers() & board->GetEnabledLayers() ) )
        {
            draw = true;
        }
 
        if( !aVia->FlashLayer( currentLayer ) )
            draw = false;
 
        if( !outline_mode )
        {
            m_gal->SetLineWidth( annular_width );
            radius -= annular_width / 2.0;
        }
 
        if( draw )
            m_gal->DrawCircle( center, radius );
 
        // Draw post-machining indicator if this layer is post-machined
        if( !m_pcbSettings.IsPrinting() && draw )
        {
            drawPostMachiningIndicator( aVia, center, currentLayer );
        }
    }
    else if( aLayer == LAYER_LOCKED_ITEM_SHADOW )    // draw a ring around the via
    {
        m_gal->SetLineWidth( m_lockedShadowMargin );
 
        m_gal->DrawCircle( center, ( aVia->GetWidth( currentLayer ) + m_lockedShadowMargin ) / 2.0 );
    }
 
    // Clearance lines
    if( IsClearanceLayer( aLayer ) && pcbconfig()
        && pcbconfig()->m_Display.m_TrackClearance == SHOW_WITH_VIA_ALWAYS
        && !m_pcbSettings.m_isPrinting )
    {
        const PCB_LAYER_ID copperLayerForClearance = ToLAYER_ID( aLayer - LAYER_CLEARANCE_START );
 
        double radius;
 
        if( aVia->FlashLayer( copperLayerForClearance ) )
            radius = aVia->GetWidth( copperLayerForClearance ) / 2.0;
        else
            radius = getViaDrillSize( aVia ) / 2.0 + m_holePlatingThickness;
 
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
        m_gal->SetIsFill( false );
        m_gal->SetIsStroke( true );
        m_gal->SetStrokeColor( color );
        m_gal->DrawCircle( center, radius + aVia->GetOwnClearance( copperLayerForClearance ) );
    }
}
 
 
// A shape mark has no text, so the cells are empty and the symbol column would otherwise
// print blank on every chart using the default policy
void PCB_PAINTER::drawChartSymbols( const PCB_DRILL_CHART* aChart, int aLayer )
{
    if( aChart->GetSymbolColumn() < 0 || aChart->RowShapes().empty() )
        return;
 
    const BOARD* board = aChart->GetBoard();
 
    if( !board )
        return;
 
    const DRILL_SYMBOL_PROFILE& profile = board->GetDesignSettings().GetDrillSymbolProfile();
 
    m_gal->SetIsFill( false );
    m_gal->SetIsStroke( true );
    m_gal->SetStrokeColor( m_pcbSettings.GetColor( aChart, aLayer ) );
    m_gal->SetLineWidth( profile.GetSymbolWidth() );
 
    for( const auto& [row, shapeIndex] : aChart->RowShapes() )
    {
        const PCB_TABLECELL* cell = aChart->GetCell( row, aChart->GetSymbolColumn() );
 
        if( !cell )
            continue;
 
        const BOX2I    box = cell->GetBoundingBox();
        const VECTOR2I centre = box.GetCenter();
 
        // Fitted to the cell so a tall symbol size cannot spill into the neighbouring row
        const int radius = std::min<int>( profile.GetSymbolSize() / 2,
                                          std::min( box.GetWidth(), box.GetHeight() ) / 3 );
 
        if( radius <= 0 )
            continue;
 
        const unsigned shape = DRILL_MARKERS::CuratedShape( shapeIndex );
 
        for( const DRILL_MARKERS::MARKER_PART& part :
             DRILL_MARKERS::BuildMarker( centre, radius, shape ) )
        {
            switch( part.m_Type )
            {
            case DRILL_MARKERS::MARKER_PART::SEGMENT:
                m_gal->DrawLine( part.m_Points.front(), part.m_Points.back() );
                break;
 
            case DRILL_MARKERS::MARKER_PART::POLYLINE:
                for( size_t ii = 0; ii + 1 < part.m_Points.size(); ++ii )
                    m_gal->DrawLine( part.m_Points[ii], part.m_Points[ii + 1] );
 
                break;
 
            case DRILL_MARKERS::MARKER_PART::CIRCLE:
                m_gal->DrawCircle( centre, part.m_Radius );
                break;
            }
        }
    }
}
 
 
// The holes draw the marks, so without the outline and anchor drawn here there would be
// nothing on screen to click and a placed map could not be selected or deleted
void PCB_PAINTER::draw( const PCB_DRILL_MAP* aMap, int aLayer )
{
    const BOARD* board = aMap->GetBoard();
 
    // The plotted width, not the sketch width, because the outline is artwork the map really
    // does emit rather than an editing decoration
    const int outlineWidth =
            board ? std::max<int>( board->GetDesignSettings().GetDrillSymbolProfile().GetSymbolWidth(), 1 ) : 1;
 
    m_gal->SetIsFill( false );
    m_gal->SetIsStroke( true );
    m_gal->SetStrokeColor( m_pcbSettings.GetColor( aMap, aLayer ) );
    m_gal->SetLineWidth( outlineWidth );
 
    const std::shared_ptr<const SHAPE_POLY_SET> outlines = aMap->GetBoardOutlines();
 
    for( int ii = 0; ii < outlines->OutlineCount(); ++ii )
    {
        m_gal->DrawSegmentChain( outlines->COutline( ii ), outlineWidth );
 
        for( int jj = 0; jj < outlines->HoleCount( ii ); ++jj )
            m_gal->DrawSegmentChain( outlines->CHole( ii, jj ), outlineWidth );
    }
 
    // Every hole's view bounds were computed for the offset the map had when the drag began,
    // so the holes cannot draw the marks where they are now without being culled
    if( aMap->IsMoving() && board )
    {
        const std::shared_ptr<const DRILL_SYMBOL_CACHE> cache = board->DrillSymbolCache();
        const COLOR4D                                   markColor = m_pcbSettings.GetColor( aMap, aLayer );
 
        for( const auto& [itemId, entries] : cache->m_ByItem )
            drawDrillMarks( aMap, entries, markColor, aMap->GetFontMetrics() );
    }
 
    if( !aMap->IsSelected() && !aMap->IsBrightened() )
        return;
 
    const int thickness = std::max<int>( m_pcbSettings.m_outlineWidth, 1 );
 
    m_gal->SetLineWidth( thickness );
 
    const BOX2I box = aMap->GetBoundingBox();
 
    if( box.GetWidth() <= 0 || box.GetHeight() <= 0 )
        return;
 
    SHAPE_RECT rect( box );
 
    STROKE_PARAMS::Stroke( &rect, LINE_STYLE::DASH, thickness, &m_pcbSettings,
                           [&]( const VECTOR2I& a, const VECTOR2I& b )
                           {
                               m_gal->DrawSegment( a, b, thickness );
                           } );
}
 
 
// The mark comes from the board's shared symbol profile, so a symbol on screen means the
// same hole as that symbol in a plotted chart
void PCB_PAINTER::drawDrillSymbol( const BOARD_ITEM* aItem, int aLayer )
{
    const BOARD* board = aItem->GetBoard();
 
    if( !board )
        return;
 
    const std::vector<const PCB_DRILL_MAP*> maps =
            board->DrillMapsOnLayer( BOARD_LAYER_FOR_DRILL_SYMBOL( aLayer ) );
 
    if( maps.empty() )
        return;
 
    // Held for the duration, because another thread may publish a new snapshot mid-draw
    const std::shared_ptr<const DRILL_SYMBOL_CACHE> cache = board->DrillSymbolCache();
 
    const auto it = cache->m_ByItem.find( aItem->m_Uuid );
 
    if( it == cache->m_ByItem.end() )
    {
        return;
    }
 
    const COLOR4D color = m_pcbSettings.GetColor( aItem, aLayer );
 
    // Several maps can share a layer. The UI prevents it but a parsed, pasted or
    // API-created board need not
    for( const PCB_DRILL_MAP* map : maps )
    {
        // A map being dragged draws its own marks. The hole's view bounds still describe
        // where they were, so drawing them from here would have them culled mid-drag.
        if( map->IsMoving() )
            continue;
 
        drawDrillMarks( map, it->second, color, aItem->GetFontMetrics() );
    }
}
 
 
void PCB_PAINTER::drawDrillMarks( const PCB_DRILL_MAP* aMap, const std::vector<DRILL_SYMBOL_ENTRY>& aEntries,
                                  const COLOR4D& aColor, const KIFONT::METRICS& aFontMetrics )
{
    const BOARD* board = aMap->GetBoard();
 
    if( !board )
        return;
 
    const DRILL_SYMBOL_PROFILE& profile = board->GetDesignSettings().GetDrillSymbolProfile();
 
    const int symbolSize = aMap->GetSymbolSize();
    const int radius = symbolSize / 2;
 
    for( const DRILL_SYMBOL_ENTRY& entry : aEntries )
    {
        if( !aMap->GetAllSpans() && !( entry.m_Span == aMap->GetSpan() ) )
            continue;
 
        // The mark is displaced from the hole it reports. The hole itself never moves
        const VECTOR2I pos = entry.m_Position + aMap->GetOffset();
 
        m_gal->SetIsFill( false );
        m_gal->SetIsStroke( true );
        m_gal->SetStrokeColor( aColor );
        m_gal->SetLineWidth( profile.GetSymbolWidth() );
 
        if( entry.m_Symbol.m_MarkMode == DRILL_MARK_MODE::SHAPE )
        {
            const unsigned shape = DRILL_MARKERS::CuratedShape( entry.m_Symbol.m_ShapeIndex );
 
            for( const DRILL_MARKERS::MARKER_PART& part :
                 DRILL_MARKERS::BuildMarker( pos, radius, shape ) )
            {
                switch( part.m_Type )
                {
                case DRILL_MARKERS::MARKER_PART::SEGMENT:
                    m_gal->DrawLine( part.m_Points.front(), part.m_Points.back() );
                    break;
 
                case DRILL_MARKERS::MARKER_PART::POLYLINE:
                    for( size_t ii = 0; ii + 1 < part.m_Points.size(); ++ii )
                        m_gal->DrawLine( part.m_Points[ii], part.m_Points[ii + 1] );
 
                    break;
 
                case DRILL_MARKERS::MARKER_PART::CIRCLE:
                    m_gal->DrawCircle( pos, part.m_Radius );
                    break;
                }
            }
        }
        else
        {
            // The hole's own diameter, not the glyph size, or every hole would be labelled
            // with the same number and the screen would disagree with the plot
            const wxString text =
                    entry.m_Symbol.m_MarkMode == DRILL_MARK_MODE::LETTER
                            ? entry.m_Symbol.m_Letter
                            : wxString::Format( wxT( "%.2f" ),
                                                pcbIUScale.IUTomm( entry.m_Diameter ) );
 
            TEXT_ATTRIBUTES attrs;
            attrs.m_Size = VECTOR2I( symbolSize, symbolSize );
            attrs.m_StrokeWidth = profile.GetSymbolWidth();
            attrs.m_Halign = GR_TEXT_H_ALIGN_CENTER;
            attrs.m_Valign = GR_TEXT_V_ALIGN_CENTER;
 
            m_gal->SetIsFill( true );
            m_gal->SetFillColor( aColor );
            strokeText( text, pos, attrs, aFontMetrics );
        }
 
        if( aMap->GetGuideCross() )
        {
            // Reach matches the plotter exactly rather than 2 * radius, which loses an IU
            // for an odd symbol size and makes screen and plot disagree
            const int reach = symbolSize;
 
            m_gal->SetIsFill( false );
            m_gal->SetIsStroke( true );
            m_gal->SetStrokeColor( aColor );
            m_gal->SetLineWidth( profile.GetSymbolWidth() );
            m_gal->DrawLine( pos - VECTOR2I( reach, 0 ), pos + VECTOR2I( reach, 0 ) );
            m_gal->DrawLine( pos - VECTOR2I( 0, reach ), pos + VECTOR2I( 0, reach ) );
        }
 
        // A slot's true extent is the cost driver, so it is outlined as well as marked
        if( aMap->GetOutlineSlots() && entry.m_IsSlot )
        {
            // Built the same way the plotter builds its oval, so a rotated or tall slot is
            // not drawn as a horizontal one on screen
            VECTOR2I size = entry.m_SizeXY;
            EDA_ANGLE orientation = entry.m_Orientation;
 
            if( size.x > size.y )
            {
                std::swap( size.x, size.y );
                orientation += ANGLE_90;
            }
 
            const int      half = ( size.y - size.x ) / 2;
            const VECTOR2I offset = VECTOR2I( 0, half );
            VECTOR2I       start = offset;
            VECTOR2I       end = VECTOR2I( 0, -half );
 
            RotatePoint( start, orientation );
            RotatePoint( end, orientation );
 
            m_gal->SetIsFill( false );
            m_gal->SetIsStroke( true );
            m_gal->SetStrokeColor( aColor );
            m_gal->SetLineWidth( profile.GetSymbolWidth() );
            m_gal->DrawSegment( pos + start, pos + end, size.x );
        }
    }
}
 
 
void PCB_PAINTER::draw( const PAD* aPad, int aLayer )
{
    COLOR4D      color = m_pcbSettings.GetColor( aPad, aLayer );
    const int    copperLayer = IsPadCopperLayer( aLayer ) ? aLayer - LAYER_PAD_COPPER_START : aLayer;
    PCB_LAYER_ID pcbLayer = static_cast<PCB_LAYER_ID>( copperLayer );
 
    if( IsNetnameLayer( aLayer ) )
    {
        PCBNEW_SETTINGS::DISPLAY_OPTIONS* displayOpts = pcbconfig() ? &pcbconfig()->m_Display : nullptr;
        wxString                          netname;
        wxString                          padNumber;
 
        if( viewer_settings()->m_ViewersDisplay.m_DisplayPadNumbers )
        {
            padNumber = UnescapeString( aPad->GetNumber() );
 
            if( dynamic_cast<CVPCB_SETTINGS*>( viewer_settings() ) )
                netname = aPad->GetPinFunction();
        }
 
        if( displayOpts && !dynamic_cast<CVPCB_SETTINGS*>( viewer_settings() ) )
        {
            if( displayOpts->m_NetNames == 1 || displayOpts->m_NetNames == 3 )
                netname = aPad->GetDisplayNetname();
 
            if( aPad->IsNoConnectPad() )
                netname = wxT( "x" );
            else if( aPad->IsFreePad() )
                netname = wxT( "*" );
        }
 
        if( netname.IsEmpty() && padNumber.IsEmpty() )
            return;
 
        BOX2I    padBBox = aPad->GetBoundingBox();
        VECTOR2D position = padBBox.Centre();
        VECTOR2D padsize = VECTOR2D( padBBox.GetSize() );
 
        if( aPad->IsEntered() )
        {
            FOOTPRINT* fp = aPad->GetParentFootprint();
 
            // Find the number box
            for( const BOARD_ITEM* aItem : fp->GraphicalItems() )
            {
                if( aItem->Type() == PCB_SHAPE_T )
                {
                    const PCB_SHAPE* shape = static_cast<const PCB_SHAPE*>( aItem );
 
                    if( shape->IsProxyItem() && shape->GetShape() == SHAPE_T::RECTANGLE )
                    {
                        position = shape->GetCenter();
                        padsize = shape->GetBotRight() - shape->GetTopLeft();
 
                        // We normally draw a bit outside the pad, but this will be somewhat
                        // unexpected when the user has drawn a box.
                        padsize *= 0.9;
 
                        break;
                    }
                }
            }
        }
        else if( aPad->GetShape( pcbLayer ) == PAD_SHAPE::CUSTOM )
        {
            // See if we have a number box
            for( const std::shared_ptr<PCB_SHAPE>& primitive : aPad->GetPrimitives( pcbLayer ) )
            {
                if( primitive->IsProxyItem() && primitive->GetShape() == SHAPE_T::RECTANGLE )
                {
                    position = primitive->GetCenter();
                    RotatePoint( position, aPad->GetOrientation() );
                    position += aPad->ShapePos( pcbLayer );
 
                    padsize.x = abs( primitive->GetBotRight().x - primitive->GetTopLeft().x );
                    padsize.y = abs( primitive->GetBotRight().y - primitive->GetTopLeft().y );
 
                    // We normally draw a bit outside the pad, but this will be somewhat
                    // unexpected when the user has drawn a box.
                    padsize *= 0.9;
 
                    break;
                }
            }
        }
 
        if( aPad->GetShape( pcbLayer ) != PAD_SHAPE::CUSTOM )
        {
            // Don't allow a 45° rotation to bloat a pad's bounding box unnecessarily
            double limit = std::min( aPad->GetSize( pcbLayer ).x, aPad->GetSize( pcbLayer ).y ) * 1.1;
 
            if( padsize.x > limit && padsize.y > limit )
            {
                padsize.x = limit;
                padsize.y = limit;
            }
        }
 
        double maxSize = PCB_RENDER_SETTINGS::MAX_FONT_SIZE;
        double size = padsize.y;
 
        m_gal->Save();
        m_gal->Translate( position );
 
        // Keep the size ratio for the font, but make it smaller
        if( padsize.x < ( padsize.y * 0.95 ) )
        {
            m_gal->Rotate( -ANGLE_90.AsRadians() );
            size = padsize.x;
            std::swap( padsize.x, padsize.y );
        }
 
        // Font size limits
        if( size > maxSize )
            size = maxSize;
 
        // Default font settings
        m_gal->ResetTextAttributes();
        m_gal->SetHorizontalJustify( GR_TEXT_H_ALIGN_CENTER );
        m_gal->SetVerticalJustify( GR_TEXT_V_ALIGN_CENTER );
        m_gal->SetFontBold( false );
        m_gal->SetFontItalic( false );
        m_gal->SetFontUnderlined( false );
        m_gal->SetTextMirrored( false );
        m_gal->SetStrokeColor( m_pcbSettings.GetColor( aPad, aLayer ) );
        m_gal->SetIsStroke( true );
        m_gal->SetIsFill( false );
 
        // We have already translated the GAL to be centered at the center of the pad's
        // bounding box
        VECTOR2I textpos( 0, 0 );
 
        // Divide the space, to display both pad numbers and netnames and set the Y text
        // offset position to display 2 lines
        int Y_offset_numpad = 0;
        int Y_offset_netname = 0;
 
        if( !netname.IsEmpty() && !padNumber.IsEmpty() )
        {
            // The magic numbers are defined experimentally for a better look.
            size = size / 2.5;
            Y_offset_netname = size / 1.4;  // netname size is usually smaller than num pad
                                            // so the offset can be smaller
            Y_offset_numpad = size / 1.7;
        }
 
        // We are using different fonts to display names, depending on the graphic
        // engine (OpenGL or Cairo).
        // Xscale_for_stroked_font adjust the text X size for cairo (stroke fonts) engine
        const double Xscale_for_stroked_font = 0.9;
 
        if( !netname.IsEmpty() )
        {
            // approximate the size of net name text:
            // We use a size for at least 5 chars, to give a good look even for short names
            // (like VCC, GND...)
            double tsize = 1.5 * padsize.x / std::max( PrintableCharCount( netname )+1, 5 );
            tsize = std::min( tsize, size );
 
            // Use a smaller text size to handle interline, pen size...
            tsize *= 0.85;
 
            // Round and oval pads have less room to display the net name than other
            // (i.e RECT) shapes, so reduce the text size for these shapes
            if( aPad->GetShape( pcbLayer ) == PAD_SHAPE::CIRCLE
                || aPad->GetShape( pcbLayer ) == PAD_SHAPE::OVAL )
            {
                tsize *= 0.9;
            }
 
            VECTOR2D namesize( tsize*Xscale_for_stroked_font, tsize );
            textpos.y = KiROUND( std::min( tsize * 1.4, double( Y_offset_netname ) ) );
 
            m_gal->SetGlyphSize( namesize );
            m_gal->SetLineWidth( namesize.x / 6.0 );
            m_gal->SetFontBold( true );
            m_gal->BitmapText( netname, textpos, ANGLE_HORIZONTAL );
        }
 
        if( !padNumber.IsEmpty() )
        {
            // approximate the size of the pad number text:
            // We use a size for at least 3 chars, to give a good look even for short numbers
            double tsize = 1.5 * padsize.x / std::max( PrintableCharCount( padNumber ), 3 );
            tsize = std::min( tsize, size );
 
            // Use a smaller text size to handle interline, pen size...
            tsize *= 0.85;
            tsize = std::min( tsize, size );
            VECTOR2D numsize( tsize*Xscale_for_stroked_font, tsize );
            textpos.y = -Y_offset_numpad;
 
            m_gal->SetGlyphSize( numsize );
            m_gal->SetLineWidth( numsize.x / 6.0 );
            m_gal->SetFontBold( true );
            m_gal->BitmapText( padNumber, textpos, ANGLE_HORIZONTAL );
        }
 
        m_gal->Restore();
 
        return;
    }
    else if( aLayer == LAYER_PAD_HOLEWALLS )
    {
        m_gal->SetIsFill( true );
        m_gal->SetIsStroke( false );
        double widthFactor = ADVANCED_CFG::GetCfg().m_HoleWallPaintingMultiplier;
        double lineWidth = widthFactor * m_holePlatingThickness;
        lineWidth = std::min( lineWidth, aPad->GetSizeX() / 2.0 );
        lineWidth = std::min( lineWidth, aPad->GetSizeY() / 2.0 );
 
        m_gal->SetFillColor( color );
        m_gal->SetMinLineWidth( lineWidth );
 
        std::shared_ptr<SHAPE_SEGMENT> slot = aPad->GetEffectiveHoleShape();
 
        if( slot->GetSeg().A == slot->GetSeg().B )    // Circular hole
        {
            double holeRadius = slot->GetWidth() / 2.0;
            m_gal->DrawHoleWall( slot->GetSeg().A, holeRadius, lineWidth );
        }
        else
        {
            int holeSize = KiROUND( slot->GetWidth() + ( 2 * lineWidth ) );
            m_gal->DrawSegment( slot->GetSeg().A, slot->GetSeg().B, holeSize );
        }
 
        m_gal->SetMinLineWidth( 1.0 );
 
        // Draw backdrill indicators on top of the hole wall so they remain visible
        // regardless of layer rendering order
        if( !m_pcbSettings.IsPrinting() && aPad->GetDrillSizeX() > 0 )
        {
            const VECTOR2I& holePos = slot->GetSeg().A;
            const VECTOR2I& secDrill = aPad->GetSecondaryDrillSize();
            const VECTOR2I& terDrill = aPad->GetTertiaryDrillSize();
 
            if( secDrill.x > 0 )
            {
                drawBackdrillIndicator( aPad, holePos, secDrill.x, aPad->GetSecondaryDrillStartLayer(),
                                        aPad->GetSecondaryDrillEndLayer() );
            }
 
            if( terDrill.x > 0 )
            {
                drawBackdrillIndicator( aPad, holePos, terDrill.x, aPad->GetTertiaryDrillStartLayer(),
                                        aPad->GetTertiaryDrillEndLayer() );
            }
        }
 
        return;
    }
 
    bool outline_mode = !viewer_settings()->m_ViewersDisplay.m_DisplayPadFill;
 
    if( m_pcbSettings.m_ForcePadSketchModeOn )
        outline_mode = true;
 
    bool drawShape = false;
 
    if( m_pcbSettings.IsPrinting() )
    {
        drawShape = aPad->FlashLayer( m_pcbSettings.GetPrintLayers() );
    }
    else if( ( aLayer < PCB_LAYER_ID_COUNT || IsPadCopperLayer( aLayer ) )
             && aPad->FlashLayer( pcbLayer ) )
    {
        drawShape = true;
    }
    else if( aPad->IsSelected() )
    {
        drawShape = true;
        outline_mode = true;
    }
    else if( aLayer == LAYER_LOCKED_ITEM_SHADOW )
    {
        drawShape = true;
        outline_mode = false;
    }
 
    // Plated holes are always filled as they use a solid BG fill to
    // draw the "hole" over the hole-wall segment/circle.
    if( outline_mode && aLayer != LAYER_PAD_PLATEDHOLES )
    {
        // Outline mode
        m_gal->SetIsFill( false );
        m_gal->SetIsStroke( true );
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
        m_gal->SetStrokeColor( color );
    }
    else
    {
        // Filled mode
        m_gal->SetIsFill( true );
        m_gal->SetIsStroke( false );
        m_gal->SetFillColor( color );
    }
 
    if( aLayer == LAYER_PAD_PLATEDHOLES || aLayer == LAYER_NON_PLATEDHOLES )
    {
        SHAPE_SEGMENT slot = getPadHoleShape( aPad );
        VECTOR2I center = slot.GetSeg().A;
 
        if( slot.GetSeg().A == slot.GetSeg().B )    // Circular hole
            m_gal->DrawCircle( center, slot.GetWidth() / 2.0 );
        else
            m_gal->DrawSegment( slot.GetSeg().A, slot.GetSeg().B, slot.GetWidth() );
    }
    else if( drawShape )
    {
        VECTOR2I pad_size = aPad->GetSize( pcbLayer );
        VECTOR2I margin;
 
        auto getExpansion =
                [&]( PCB_LAYER_ID layer )
                {
                    VECTOR2I expansion;
 
                    switch( aLayer )
                    {
                    case F_Mask:
                    case B_Mask:
                        expansion.x = expansion.y = aPad->GetSolderMaskExpansion( layer );
                        break;
 
                    case F_Paste:
                    case B_Paste:
                        expansion = aPad->GetSolderPasteMargin( layer );
                        break;
 
                    default:
                        expansion.x = expansion.y = 0;
                        break;
                    }
 
                    return expansion;
                };
 
        if( aLayer == LAYER_LOCKED_ITEM_SHADOW )
        {
            LSET visibleLayers = aPad->GetBoard()->GetVisibleLayers()
                                        & aPad->GetBoard()->GetEnabledLayers()
                                        & aPad->GetLayerSet();
 
            for( PCB_LAYER_ID layer : visibleLayers )
                margin = std::max( margin, getExpansion( layer ) );
 
            margin.x += m_lockedShadowMargin / 2;
            margin.y += m_lockedShadowMargin / 2;
        }
        else
        {
            margin = getExpansion( pcbLayer );
        }
 
        std::unique_ptr<PAD>            dummyPad;
        std::shared_ptr<SHAPE_COMPOUND> shapes;
 
        // Drawing components of compound shapes in outline mode produces a mess.
        bool simpleShapes = !outline_mode;
 
        if( simpleShapes )
        {
            if( ( margin.x != margin.y && aPad->GetShape( pcbLayer ) != PAD_SHAPE::CUSTOM )
                || ( aPad->GetShape( pcbLayer ) == PAD_SHAPE::ROUNDRECT
                     && ( margin.x < 0 || margin.y < 0 ) ) )
            {
                // Our algorithms below (polygon inflation in particular) can't handle differential
                // inflation along separate axes.  So for those cases we build a dummy pad instead,
                // and inflate it.
 
                // Margin is added to both sides.  If the total margin is larger than the pad
                // then don't display this layer
                if( pad_size.x + 2 * margin.x <= 0 || pad_size.y + 2 * margin.y <= 0 )
                    return;
 
                dummyPad.reset( static_cast<PAD*>( aPad->Duplicate( IGNORE_PARENT_GROUP ) ) );
 
                int initial_radius = dummyPad->GetRoundRectCornerRadius( pcbLayer );
 
                dummyPad->SetSize( pcbLayer, pad_size + margin + margin );
 
                if( dummyPad->GetShape( pcbLayer ) == PAD_SHAPE::ROUNDRECT )
                {
                    // To keep the right margin around the corners, we need to modify the corner radius.
                    // We must have only one radius correction, so use the smallest absolute margin.
                    int radius_margin = std::max( margin.x, margin.y );     // radius_margin is < 0
                    dummyPad->SetRoundRectCornerRadius( pcbLayer, std::max( initial_radius + radius_margin, 0 ) );
                }
 
                shapes = std::dynamic_pointer_cast<SHAPE_COMPOUND>( dummyPad->GetEffectiveShape( pcbLayer ) );
                margin.x = margin.y = 0;
            }
            else
            {
                shapes = std::dynamic_pointer_cast<SHAPE_COMPOUND>( aPad->GetEffectiveShape( pcbLayer ) );
            }
 
            // The dynamic cast above will fail if the pad returned the hole shape or a null shape
            // instead of a SHAPE_COMPOUND, which happens if we're on a copper layer and the pad has
            // no shape on that layer.
            if( !shapes )
                return;
 
            if( aPad->GetShape( pcbLayer ) == PAD_SHAPE::CUSTOM && ( margin.x || margin.y ) )
            {
                // We can't draw as shapes because we don't know which edges are internal and which
                // are external (so we don't know when to apply the margin and when not to).
                simpleShapes = false;
            }
 
            for( const SHAPE* shape : shapes->Shapes() )
            {
                if( !simpleShapes )
                    break;
 
                switch( shape->Type() )
                {
                case SH_SEGMENT:
                case SH_CIRCLE:
                case SH_RECT:
                case SH_SIMPLE:
                    // OK so far
                    break;
 
                default:
                    // Not OK
                    simpleShapes = false;
                    break;
                }
            }
        }
 
        const auto drawOneSimpleShape =
                [&]( const SHAPE& aShape )
                {
                    switch( aShape.Type() )
                    {
                    case SH_SEGMENT:
                    {
                        const SHAPE_SEGMENT& seg = (const SHAPE_SEGMENT&) aShape;
                        int                  effectiveWidth = seg.GetWidth() + 2 * margin.x;
 
                        if( effectiveWidth > 0 )
                            m_gal->DrawSegment( seg.GetSeg().A, seg.GetSeg().B, effectiveWidth );
 
                        break;
                    }
 
                    case SH_CIRCLE:
                    {
                        const SHAPE_CIRCLE& circle = (const SHAPE_CIRCLE&) aShape;
                        int                 effectiveRadius = circle.GetRadius() + margin.x;
 
                        if( effectiveRadius > 0 )
                            m_gal->DrawCircle( circle.GetCenter(), effectiveRadius );
 
                        break;
                    }
 
                    case SH_RECT:
                    {
                        const SHAPE_RECT& r = (const SHAPE_RECT&) aShape;
                        VECTOR2I          pos = r.GetPosition();
                        VECTOR2I          effectiveMargin = margin;
 
                        if( effectiveMargin.x < 0 )
                        {
                            // A negative margin just produces a smaller rect.
                            VECTOR2I effectiveSize = r.GetSize() + effectiveMargin;
 
                            if( effectiveSize.x > 0 && effectiveSize.y > 0 )
                                m_gal->DrawRectangle( pos - effectiveMargin, pos + effectiveSize );
                        }
                        else if( effectiveMargin.x > 0 )
                        {
                            // A positive margin produces a larger rect, but with rounded corners
                            m_gal->DrawRectangle( r.GetPosition(), r.GetPosition() + r.GetSize() );
 
                            // Use segments to produce the margin with rounded corners
                            m_gal->DrawSegment( pos,
                                                pos + VECTOR2I( r.GetWidth(), 0 ),
                                                effectiveMargin.x * 2 );
                            m_gal->DrawSegment( pos + VECTOR2I( r.GetWidth(), 0 ),
                                                pos + r.GetSize(),
                                                effectiveMargin.x * 2 );
                            m_gal->DrawSegment( pos + r.GetSize(),
                                                pos + VECTOR2I( 0, r.GetHeight() ),
                                                effectiveMargin.x * 2 );
                            m_gal->DrawSegment( pos + VECTOR2I( 0, r.GetHeight() ),
                                                pos,
                                                effectiveMargin.x * 2 );
                        }
                        else
                        {
                            m_gal->DrawRectangle( r.GetPosition(), r.GetPosition() + r.GetSize() );
                        }
 
                        break;
                    }
 
                    case SH_SIMPLE:
                    {
                        const SHAPE_SIMPLE& poly = static_cast<const SHAPE_SIMPLE&>( aShape );
 
                        if( poly.PointCount() < 2 ) // Careful of empty pads
                            break;
 
                        if( margin.x < 0 ) // The poly shape must be deflated
                        {
                            SHAPE_POLY_SET outline;
                            outline.NewOutline();
 
                            for( int ii = 0; ii < poly.PointCount(); ++ii )
                                outline.Append( poly.CPoint( ii ) );
 
                            outline.Deflate( -margin.x, CORNER_STRATEGY::CHAMFER_ALL_CORNERS, m_maxError );
 
                            m_gal->DrawPolygon( outline );
                        }
                        else
                        {
                            m_gal->DrawPolygon( poly.Vertices() );
                        }
 
                        // Now add on a rounded margin (using segments) if the margin > 0
                        if( margin.x > 0 )
                        {
                            for( int ii = 0; ii < (int) poly.GetSegmentCount(); ++ii )
                            {
                                SEG seg = poly.GetSegment( ii );
                                m_gal->DrawSegment( seg.A, seg.B, margin.x * 2 );
                            }
                        }
 
                        break;
                    }
 
                    default:
                        // Better not get here; we already pre-flighted the shapes...
                        break;
                    }
                };
 
        if( simpleShapes )
        {
            for( const SHAPE* shape : shapes->Shapes() )
                drawOneSimpleShape( *shape );
        }
        else
        {
            // This is expensive.  Avoid if possible.
            SHAPE_POLY_SET polySet;
            aPad->TransformShapeToPolygon( polySet, ToLAYER_ID( aLayer ), margin.x, m_maxError, ERROR_INSIDE );
            m_gal->DrawPolygon( polySet );
        }
 
    }
 
    if( !m_pcbSettings.IsPrinting() && IsCopperLayer( pcbLayer ) && aPad->GetDrillSizeX() > 0 )
    {
        VECTOR2D holePos = aPad->GetPosition() + aPad->GetOffset( pcbLayer );
        drawPostMachiningIndicator( aPad, holePos, pcbLayer );
    }
 
    if( IsClearanceLayer( aLayer )
            && ( ( pcbconfig() && pcbconfig()->m_Display.m_PadClearance ) || !pcbconfig() )
            && !m_pcbSettings.m_isPrinting )
    {
        const PCB_LAYER_ID copperLayerForClearance = ToLAYER_ID( aLayer - LAYER_CLEARANCE_START );
 
        if( aPad->GetAttribute() == PAD_ATTRIB::NPTH )
            color = m_pcbSettings.GetLayerColor( LAYER_NON_PLATEDHOLES );
 
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
        m_gal->SetIsStroke( true );
        m_gal->SetIsFill( false );
        m_gal->SetStrokeColor( color );
 
        const int clearance = aPad->GetOwnClearance( copperLayerForClearance );
 
        if( aPad->FlashLayer( copperLayerForClearance ) && clearance > 0 )
        {
            auto shape = std::dynamic_pointer_cast<SHAPE_COMPOUND>( aPad->GetEffectiveShape( pcbLayer ) );
 
            if( shape && shape->Size() == 1 && shape->Shapes()[0]->Type() == SH_SEGMENT )
            {
                const SHAPE_SEGMENT* seg = (SHAPE_SEGMENT*) shape->Shapes()[0];
                m_gal->DrawSegment( seg->GetSeg().A, seg->GetSeg().B, seg->GetWidth() + 2 * clearance );
            }
            else if( shape && shape->Size() == 1 && shape->Shapes()[0]->Type() == SH_CIRCLE )
            {
                const SHAPE_CIRCLE* circle = (SHAPE_CIRCLE*) shape->Shapes()[0];
                m_gal->DrawCircle( circle->GetCenter(), circle->GetRadius() + clearance );
            }
            else
            {
                SHAPE_POLY_SET polySet;
 
                // Use ERROR_INSIDE because it avoids Clipper and is therefore much faster.
                aPad->TransformShapeToPolygon( polySet, copperLayerForClearance, clearance, m_maxError, ERROR_INSIDE );
 
                if( polySet.Outline( 0 ).PointCount() > 2 ) // Careful of empty pads
                    m_gal->DrawPolygon( polySet );
            }
        }
        else if( aPad->GetEffectiveHoleShape() && clearance > 0 )
        {
            std::shared_ptr<SHAPE_SEGMENT> slot = aPad->GetEffectiveHoleShape();
            m_gal->DrawSegment( slot->GetSeg().A, slot->GetSeg().B, slot->GetWidth() + 2 * clearance );
        }
    }
 
    if( m_pcbSettings.IsHighlightEnabled()
            && m_pcbSettings.GetHighlightNetCodes().contains( aPad->GetNetCode() ) )
    {
        NETINFO_ITEM* net = aPad->GetNet();
        if( net && ( net->GetTerminalPad( 0 ) == aPad || net->GetTerminalPad( 1 ) == aPad ) )
        {
            BOX2I box = aPad->GetBoundingBox();
            m_gal->SetIsFill( false );
            m_gal->SetIsStroke( true );
 
            // Base emphasis (net highlight)
            COLOR4D termColor = color.Brightened( 0.2 );
            int baseWidth = m_pcbSettings.m_outlineWidth * 2;
 
            // If a grouped chain highlight is active and this pad belongs to that chain,
            // make the emphasis stronger (brighter + thicker + inset second rectangle).
            if( !m_pcbSettings.m_highlightedNetChain.IsEmpty()
                    && net && net->GetNetChain() == m_pcbSettings.m_highlightedNetChain )
            {
                // Prefer the chain's own colour override if the board has one.
                if( const BOARD* board = aPad->GetBoard() )
                {
                    COLOR4D chainColor =
                            board->GetNetChainColor( m_pcbSettings.m_highlightedNetChain );
 
                    if( chainColor != COLOR4D::UNSPECIFIED )
                        termColor = chainColor;
                    else
                        termColor = termColor.Brightened( 0.25 );
                }
                else
                {
                    termColor = termColor.Brightened( 0.25 );
                }
 
                baseWidth = m_pcbSettings.m_outlineWidth * 3;
            }
 
            m_gal->SetStrokeColor( termColor );
            m_gal->SetLineWidth( baseWidth );
            m_gal->DrawRectangle( box.GetOrigin(), box.GetEnd() );
 
            if( !m_pcbSettings.m_highlightedNetChain.IsEmpty()
                    && net && net->GetNetChain() == m_pcbSettings.m_highlightedNetChain )
            {
                // Draw an inner rectangle for additional visual distinction.
                // Shrink by one outline width equivalent to avoid excessive size.
                int inset = baseWidth * 2; // screen-space approx; acceptable heuristic
                BOX2I inner = box;
                inner.Inflate( -inset, -inset );
                if( inner.GetWidth() > 0 && inner.GetHeight() > 0 )
                {
                    m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
                    m_gal->DrawRectangle( inner.GetOrigin(), inner.GetEnd() );
                }
            }
        }
    }
}
 
 
void PCB_PAINTER::draw( const PCB_SHAPE* aShape, int aLayer )
{
    COLOR4D    color = m_pcbSettings.GetColor( aShape, aLayer );
    bool       outline_mode = !viewer_settings()->m_ViewersDisplay.m_DisplayGraphicsFill;
    int        thickness = getLineThickness( aShape->GetWidth() );
    LINE_STYLE lineStyle = aShape->GetStroke().GetLineStyle();
    bool       isSolidFill = aShape->IsSolidFill();
    bool       isHatchedFill = aShape->IsHatchedFill();
 
    if( lineStyle == LINE_STYLE::DEFAULT )
        lineStyle = LINE_STYLE::SOLID;
 
    if( IsSolderMaskLayer( aLayer )
            && aShape->HasSolderMask()
            && IsExternalCopperLayer( aShape->GetLayer() ) )
    {
        lineStyle = LINE_STYLE::SOLID;
        thickness += aShape->GetSolderMaskExpansion() * 2;
 
        if( isHatchedFill )
        {
            isSolidFill = true;
            isHatchedFill = false;
        }
    }
 
    if( IsNetnameLayer( aLayer ) )
    {
        // Net names are shown only in board editor:
        if( m_frameType != FRAME_T::FRAME_PCB_EDITOR )
            return;
 
        if( !pcbconfig() || pcbconfig()->m_Display.m_NetNames < 2 )
            return;
 
        if( aShape->GetNetCode() <= NETINFO_LIST::UNCONNECTED )
            return;
 
        const wxString& netname = aShape->GetDisplayNetname();
 
        if( netname.IsEmpty() )
            return;
 
        if( aShape->GetShape() == SHAPE_T::SEGMENT )
        {
            SHAPE_SEGMENT seg( { aShape->GetStart(), aShape->GetEnd() }, aShape->GetWidth() );
            renderNetNameForSegment( seg, color, netname );
            return;
        }
 
        // TODO: Maybe use some of the pad code?
 
        return;
    }
 
    if( aLayer == LAYER_LOCKED_ITEM_SHADOW )
    {
        color = m_pcbSettings.GetColor( aShape, aLayer );
        thickness = thickness + m_lockedShadowMargin;
 
        // Note: on LAYER_LOCKED_ITEM_SHADOW always draw shadow shapes as continuous lines
        // otherwise the look is very strange and ugly
        lineStyle = LINE_STYLE::SOLID;
    }
 
    if( aLayer == LAYER_CONSTRAINT_SHADOW )
    {
        color = m_pcbSettings.GetColor( aShape, aLayer );
        int margin = m_lockedShadowMargin;
 
        // Selected constraint members drawn brighter and thicker
        if( m_pcbSettings.GetHighlightedConstraintMembers().count( aShape->m_Uuid ) )
        {
            color = color.Brightened( 0.5 );
            margin *= 2;
        }
 
        thickness = thickness + margin;
        lineStyle = LINE_STYLE::SOLID;
    }
 
    if( outline_mode )
    {
        m_gal->SetIsFill( false );
        m_gal->SetIsStroke( true );
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
    }
 
    m_gal->SetFillColor( color );
    m_gal->SetStrokeColor( color );
 
    if( lineStyle == LINE_STYLE::SOLID || aShape->IsSolidFill() )
    {
        switch( aShape->GetShape() )
        {
        case SHAPE_T::SEGMENT:
        {
            VECTOR2I segStart = aShape->GetStart();
            VECTOR2I segEnd = aShape->GetEnd();
 
            bool drawableSegment = EDA_SHAPE::ShortenSegmentForEndings( segStart, segEnd, aShape->GetStartEnding(),
                                                                        aShape->GetEndEnding(), thickness );
 
            if( !drawableSegment )
            {
                break;
            }
            else if( aShape->IsProxyItem() )
            {
                std::vector<VECTOR2I> pts;
                VECTOR2I              offset = ( segEnd - segStart ).Perpendicular();
                offset = offset.Resize( thickness / 2 );
 
                pts.push_back( segStart + offset );
                pts.push_back( segStart - offset );
                pts.push_back( segEnd - offset );
                pts.push_back( segEnd + offset );
 
                m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
                m_gal->DrawLine( pts[0], pts[1] );
                m_gal->DrawLine( pts[1], pts[2] );
                m_gal->DrawLine( pts[2], pts[3] );
                m_gal->DrawLine( pts[3], pts[0] );
                m_gal->DrawLine( ( pts[0] + pts[1] ) / 2, ( pts[1] + pts[2] ) / 2 );
                m_gal->DrawLine( ( pts[1] + pts[2] ) / 2, ( pts[2] + pts[3] ) / 2 );
                m_gal->DrawLine( ( pts[2] + pts[3] ) / 2, ( pts[3] + pts[0] ) / 2 );
                m_gal->DrawLine( ( pts[3] + pts[0] ) / 2, ( pts[0] + pts[1] ) / 2 );
            }
            else if( outline_mode )
            {
                m_gal->DrawSegment( segStart, segEnd, thickness );
            }
            else if( lineStyle == LINE_STYLE::SOLID )
            {
                m_gal->SetIsFill( true );
                m_gal->SetIsStroke( false );
 
                m_gal->DrawSegment( segStart, segEnd, thickness );
            }
 
            break;
        }
 
        case SHAPE_T::RECTANGLE:
        {
            if( aShape->GetCornerRadius() > 0 )
            {
                // Creates a normalized ROUNDRECT item
                // (GetRectangleWidth() and GetRectangleHeight() can be < 0 with transforms
                ROUNDRECT rr( SHAPE_RECT( aShape->GetStart(), aShape->GetRectangleWidth(),
                                          aShape->GetRectangleHeight() ),
                              aShape->GetCornerRadius(), true /* normalize */  );
                SHAPE_POLY_SET poly;
                rr.TransformToPolygon( poly, aShape->GetMaxError() );
                SHAPE_LINE_CHAIN outline = poly.Outline( 0 );
 
                if( aShape->IsProxyItem() )
                {
                    m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
                    m_gal->DrawPolygon( outline );
                }
                else if( outline_mode )
                {
                    m_gal->DrawSegmentChain( outline, thickness );
                }
                else
                {
                    m_gal->SetIsFill( true );
                    m_gal->SetIsStroke( false );
 
                    if( lineStyle == LINE_STYLE::SOLID && thickness > 0 )
                    {
                        m_gal->DrawSegmentChain( outline, thickness );
                    }
 
                    if( isSolidFill )
                    {
                        if( thickness < 0 )
                        {
                            SHAPE_POLY_SET deflated_shape = outline;
                            deflated_shape.Inflate( thickness / 2, CORNER_STRATEGY::ROUND_ALL_CORNERS, m_maxError );
                            m_gal->DrawPolygon( deflated_shape );
                        }
                        else
                        {
                            m_gal->DrawPolygon( outline );
                        }
                    }
                }
            }
            else
            {
                std::vector<VECTOR2I> pts = aShape->GetRectCorners();
 
                if( aShape->IsProxyItem() )
                {
                    m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
                    m_gal->DrawLine( pts[0], pts[1] );
                    m_gal->DrawLine( pts[1], pts[2] );
                    m_gal->DrawLine( pts[2], pts[3] );
                    m_gal->DrawLine( pts[3], pts[0] );
                    m_gal->DrawLine( pts[0], pts[2] );
                    m_gal->DrawLine( pts[1], pts[3] );
                }
                else if( outline_mode )
                {
                    m_gal->DrawSegment( pts[0], pts[1], thickness );
                    m_gal->DrawSegment( pts[1], pts[2], thickness );
                    m_gal->DrawSegment( pts[2], pts[3], thickness );
                    m_gal->DrawSegment( pts[3], pts[0], thickness );
                }
                else
                {
                    m_gal->SetIsFill( true );
                    m_gal->SetIsStroke( false );
 
                    if( lineStyle == LINE_STYLE::SOLID && thickness > 0 )
                    {
                        m_gal->DrawSegment( pts[0], pts[1], thickness );
                        m_gal->DrawSegment( pts[1], pts[2], thickness );
                        m_gal->DrawSegment( pts[2], pts[3], thickness );
                        m_gal->DrawSegment( pts[3], pts[0], thickness );
                    }
 
                    if( isSolidFill )
                    {
                        SHAPE_POLY_SET poly;
                        poly.NewOutline();
 
                        for( const VECTOR2I& pt : pts )
                            poly.Append( pt );
 
                        if( thickness < 0 )
                            poly.Inflate( thickness / 2, CORNER_STRATEGY::ROUND_ALL_CORNERS,
                                          m_maxError );
 
                        m_gal->DrawPolygon( poly );
                    }
                }
            }
 
            break;
        }
 
        case SHAPE_T::ARC:
        {
            EDA_ANGLE startAngle;
            EDA_ANGLE endAngle;
            aShape->CalcArcAngles( startAngle, endAngle );
 
            EDA_ANGLE arcAngle = endAngle - startAngle;
            bool drawableArc = aShape->ShortenArcForEndings( startAngle, arcAngle, aShape->GetRadius(), thickness );
 
            if( !drawableArc )
            {
                break;
            }
            else if( outline_mode )
            {
                m_gal->DrawArcSegment( aShape->GetCenter(), aShape->GetRadius(), startAngle, arcAngle, thickness,
                                       m_maxError );
            }
            else if( lineStyle == LINE_STYLE::SOLID )
            {
                m_gal->SetIsFill( true );
                m_gal->SetIsStroke( false );
 
                m_gal->DrawArcSegment( aShape->GetCenter(), aShape->GetRadius(), startAngle, arcAngle, thickness,
                                       m_maxError );
            }
            break;
        }
 
        case SHAPE_T::CIRCLE:
            if( outline_mode )
            {
                m_gal->DrawCircle( aShape->GetStart(), aShape->GetRadius() - thickness / 2 );
                m_gal->DrawCircle( aShape->GetStart(), aShape->GetRadius() + thickness / 2 );
            }
            else
            {
                m_gal->SetIsFill( aShape->IsSolidFill() );
                m_gal->SetIsStroke( lineStyle == LINE_STYLE::SOLID && thickness > 0 );
                m_gal->SetLineWidth( thickness );
 
                int radius = aShape->GetRadius();
 
                if( lineStyle == LINE_STYLE::SOLID && thickness > 0 )
                {
                    m_gal->DrawCircle( aShape->GetStart(), radius );
                }
                else if( isSolidFill )
                {
                    if( thickness < 0 )
                    {
                        radius += thickness / 2;
                        radius = std::max( radius, 0 );
                    }
 
                    m_gal->DrawCircle( aShape->GetStart(), radius );
                }
            }
            break;
 
        case SHAPE_T::POLY:
        {
            SHAPE_POLY_SET&  shape = const_cast<PCB_SHAPE*>( aShape )->GetPolyShape();
            bool             hasEndings = aShape->GetStartEnding().GetStyle() != LINE_ENDING_STYLE::NONE
                              || aShape->GetEndEnding().GetStyle() != LINE_ENDING_STYLE::NONE;
 
            auto drawOutlineBody = [&]( const SHAPE_LINE_CHAIN& aOutline, int aOutlineIdx )
            {
                if( aOutline.PointCount() < 2 )
                    return;
 
                if( hasEndings )
                {
                    std::vector<VECTOR2I> pts;
 
                    if( !aShape->GetShortenedBodyPolyPoints( aOutline, aOutlineIdx, pts, thickness ) )
                        return;
 
                    SHAPE_LINE_CHAIN shortened;
 
                    for( const VECTOR2I& pt : pts )
                        shortened.Append( pt );
 
                    shortened.SetClosed( aOutline.IsClosed() );
                    m_gal->DrawSegmentChain( shortened, thickness );
                    return;
                }
 
                m_gal->DrawSegmentChain( aOutline, thickness );
            };
 
            if( shape.OutlineCount() == 0 )
                break;
 
            if( outline_mode )
            {
                for( int ii = 0; ii < shape.OutlineCount(); ++ii )
                    drawOutlineBody( shape.COutline( ii ), ii );
            }
            else
            {
                m_gal->SetIsFill( true );
                m_gal->SetIsStroke( false );
 
                if( lineStyle == LINE_STYLE::SOLID && thickness > 0 )
                {
                    for( int ii = 0; ii < shape.OutlineCount(); ++ii )
                        drawOutlineBody( shape.COutline( ii ), ii );
                }
 
                if( isSolidFill )
                {
                    if( thickness < 0 )
                    {
                        SHAPE_POLY_SET deflated_shape = shape;
                        deflated_shape.Inflate( thickness / 2, CORNER_STRATEGY::ROUND_ALL_CORNERS,
                                                m_maxError );
                        m_gal->DrawPolygon( deflated_shape );
                    }
                    else
                    {
                        // On Opengl, a not convex filled polygon is usually drawn by using
                        // triangles as primitives. CacheTriangulation() can create basic triangle
                        // primitives to draw the polygon solid shape on Opengl.  GLU tessellation
                        // is much slower, so currently we are using our tessellation.
                        if( m_gal->IsOpenGlEngine() && !shape.IsTriangulationUpToDate() )
                            shape.CacheTriangulation( true );
 
                        m_gal->DrawPolygon( shape );
                    }
                }
            }
 
            break;
        }
 
        case SHAPE_T::BEZIER:
        {
            std::optional<BEZIER<double>> curve = aShape->ShortenedBezierCurve( thickness );
 
            if( !curve )
                break;
 
            if( outline_mode )
            {
                std::vector<VECTOR2D> output;
                BEZIER_POLY converter( std::vector<VECTOR2D>{ curve->Start, curve->C1, curve->C2, curve->End } );
 
                converter.GetPoly( output, m_maxError );
                m_gal->DrawSegmentChain( output, thickness );
            }
            else
            {
                m_gal->SetIsFill( aShape->IsSolidFill() );
                m_gal->SetIsStroke( lineStyle == LINE_STYLE::SOLID && thickness > 0 );
                m_gal->SetLineWidth( thickness );
                m_gal->DrawCurve( curve->Start, curve->C1, curve->C2, curve->End, m_maxError );
            }
 
            break;
        }
 
        case SHAPE_T::ELLIPSE:
        {
            const VECTOR2D   center( aShape->GetEllipseCenter() );
            const int        majorR = aShape->GetEllipseMajorRadius();
            const int        minorR = aShape->GetEllipseMinorRadius();
            const EDA_ANGLE& rot = aShape->GetEllipseRotation();
 
            if( outline_mode )
            {
                m_gal->DrawEllipse( center, majorR - thickness / 2, minorR - thickness / 2, rot );
                m_gal->DrawEllipse( center, majorR + thickness / 2, minorR + thickness / 2, rot );
            }
            else
            {
                m_gal->SetIsFill( aShape->IsSolidFill() );
                m_gal->SetIsStroke( lineStyle == LINE_STYLE::SOLID && thickness > 0 );
                m_gal->SetLineWidth( thickness );
 
                if( lineStyle == LINE_STYLE::SOLID && thickness > 0 )
                    m_gal->DrawEllipse( center, majorR, minorR, rot );
                else if( isSolidFill )
                    m_gal->DrawEllipse( center, majorR, minorR, rot );
            }
 
            break;
        }
 
        case SHAPE_T::ELLIPSE_ARC:
        {
            const VECTOR2D   center( aShape->GetEllipseCenter() );
            const int        majorR = aShape->GetEllipseMajorRadius();
            const int        minorR = aShape->GetEllipseMinorRadius();
            const EDA_ANGLE& rot = aShape->GetEllipseRotation();
            const EDA_ANGLE& start = aShape->GetEllipseStartAngle();
            const EDA_ANGLE& end = aShape->GetEllipseEndAngle();
 
            if( outline_mode )
            {
                m_gal->DrawEllipseArc( center, majorR - thickness / 2, minorR - thickness / 2, rot, start, end );
                m_gal->DrawEllipseArc( center, majorR + thickness / 2, minorR + thickness / 2, rot, start, end );
            }
            else if( lineStyle == LINE_STYLE::SOLID )
            {
                // no interior fill for arcs
                m_gal->SetIsFill( false );
                m_gal->SetIsStroke( thickness > 0 );
                m_gal->SetLineWidth( thickness );
                m_gal->DrawEllipseArc( center, majorR, minorR, rot, start, end );
            }
 
            break;
        }
 
        case SHAPE_T::UNDEFINED:
            break;
        }
    }
 
    if( lineStyle != LINE_STYLE::SOLID )
    {
        if( !outline_mode )
        {
            m_gal->SetIsFill( true );
            m_gal->SetIsStroke( false );
        }
 
        std::vector<SHAPE*> shapes = aShape->MakeEffectiveShapesForStroking( thickness );
 
        for( SHAPE* shape : shapes )
        {
            STROKE_PARAMS::Stroke( shape, lineStyle, getLineThickness( aShape->GetWidth() ),
                                   &m_pcbSettings,
                                   [&]( const VECTOR2I& a, const VECTOR2I& b )
                                   {
                                       m_gal->DrawSegment( a, b, thickness );
                                   } );
        }
 
        for( SHAPE* shape : shapes )
            delete shape;
    }
 
    if( isHatchedFill )
    {
        aShape->UpdateHatching();
        m_gal->SetIsFill( false );
        m_gal->SetIsStroke( true );
        m_gal->SetLineWidth( aShape->GetHatchLineWidth() );
 
        for( const SEG& seg : aShape->GetHatchLines() )
            m_gal->DrawLine( seg.A, seg.B );
    }
 
    // Line endings
    if( aShape->GetStartEnding().GetStyle() != LINE_ENDING_STYLE::NONE
        || aShape->GetEndEnding().GetStyle() != LINE_ENDING_STYLE::NONE )
    {
        EDA_ANGLE startTangent, endTangent;
        aShape->GetEndingTangents( startTangent, endTangent, thickness );
 
        VECTOR2I startPt, endPt;
 
        if( aShape->GetLineEndingEndpoints( startPt, endPt ) )
        {
            aShape->GetStartEnding().Draw( *m_gal, startPt, startTangent, thickness, color );
            aShape->GetEndEnding().Draw( *m_gal, endPt, endTangent, thickness, color );
        }
    }
}
 
 
void PCB_PAINTER::strokeText( const wxString& aText, const VECTOR2I& aPosition,
                              const TEXT_ATTRIBUTES& aAttrs, const KIFONT::METRICS& aFontMetrics )
{
    KIFONT::FONT* font = aAttrs.m_Font;
 
    if( !font )
        font = KIFONT::FONT::GetFont( wxEmptyString, aAttrs.m_Bold, aAttrs.m_Italic );
 
    m_gal->SetIsFill( font->IsOutline() );
    m_gal->SetIsStroke( font->IsStroke() );
 
    VECTOR2I pos( aPosition );
    VECTOR2I fudge( KiROUND( 0.16 * aAttrs.m_StrokeWidth ), 0 );
 
    RotatePoint( fudge, aAttrs.m_Angle );
 
    if( ( aAttrs.m_Halign == GR_TEXT_H_ALIGN_LEFT && !aAttrs.m_Mirrored )
            || ( aAttrs.m_Halign == GR_TEXT_H_ALIGN_RIGHT && aAttrs.m_Mirrored ) )
    {
        pos -= fudge;
    }
    else if( ( aAttrs.m_Halign == GR_TEXT_H_ALIGN_RIGHT && !aAttrs.m_Mirrored )
            || ( aAttrs.m_Halign == GR_TEXT_H_ALIGN_LEFT && aAttrs.m_Mirrored ) )
    {
        pos += fudge;
    }
 
    font->Draw( m_gal, aText, pos, aAttrs, aFontMetrics );
}
 
 
void PCB_PAINTER::draw( const PCB_REFERENCE_IMAGE* aBitmap, int aLayer )
{
    m_gal->Save();
 
    const REFERENCE_IMAGE& refImg = aBitmap->GetReferenceImage();
    m_gal->Translate( refImg.GetPosition() );
 
    // When the image scale factor is not 1.0, we need to modify the actual as the image scale
    // factor is similar to a local zoom
    const double img_scale = refImg.GetImageScale();
 
    if( img_scale != 1.0 )
        m_gal->Scale( VECTOR2D( img_scale, img_scale ) );
 
    const double imgAlpha = m_pcbSettings.GetColor( aBitmap, aBitmap->GetLayer() ).a;
 
    if( aBitmap->IsSelected() || aBitmap->IsBrightened() )
    {
        COLOR4D color = m_pcbSettings.GetColor( aBitmap, LAYER_ANCHOR );
        m_gal->SetIsStroke( true );
        m_gal->SetStrokeColor( color );
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth * 2.0f );
        m_gal->SetIsFill( false );
 
        // Draws a bounding box.
        VECTOR2D bm_size( refImg.GetSize() );
        // bm_size is the actual image size in UI.
        // but m_canvas scale was previously set to img_scale
        // so recalculate size relative to this image size.
        bm_size.x /= img_scale;
        bm_size.y /= img_scale;
        VECTOR2D origin( -bm_size.x / 2.0, -bm_size.y / 2.0 );
        VECTOR2D end = origin + bm_size;
 
        m_gal->DrawRectangle( origin, end );
 
        // Keep reference images opaque when selected (and not moving). Otherwise cached layers
        // will not be rendered under the selected image because cached layers are rendered
        // after non-cached layers (e.g. bitmaps), which will have a closer Z order.
        m_gal->DrawBitmap( refImg.GetImage(), aBitmap->IsMoving() ? imgAlpha : 1.0 );
    }
    else
        m_gal->DrawBitmap( refImg.GetImage(), imgAlpha );
 
    m_gal->Restore();
}
 
 
void PCB_PAINTER::draw( const PCB_FIELD* aField, int aLayer )
{
    if( aField->IsVisible() )
        draw( static_cast<const PCB_TEXT*>( aField ), aLayer );
}
 
 
void PCB_PAINTER::draw( const PCB_TEXT* aText, int aLayer )
{
    wxString resolvedText( aText->GetShownText( FOR_CANVAS ) );
 
    if( resolvedText.Length() == 0 )
        return;
 
    if( aLayer == LAYER_LOCKED_ITEM_SHADOW )    // happens only if locked
    {
        const COLOR4D color = m_pcbSettings.GetColor( aText, aLayer );
 
        m_gal->SetIsFill( true );
        m_gal->SetIsStroke( true );
        m_gal->SetFillColor( color );
        m_gal->SetStrokeColor( color );
        m_gal->SetLineWidth( m_lockedShadowMargin );
 
        SHAPE_POLY_SET poly;
        aText->TransformShapeToPolygon( poly, aText->GetLayer(), 0, m_maxError, ERROR_OUTSIDE );
        m_gal->DrawPolygon( poly );
 
        return;
    }
 
    const KIFONT::METRICS& metrics = aText->GetFontMetrics();
    TEXT_ATTRIBUTES        attrs = aText->GetAttributes();
    // Raw attrs are lib frame for FP children, pull scaled values for render.
    attrs.m_Size = aText->GetTextSize();
    attrs.m_StrokeWidth = aText->GetTextThickness();
    const COLOR4D&         color = m_pcbSettings.GetColor( aText, aLayer );
    bool                   outline_mode = !viewer_settings()->m_ViewersDisplay.m_DisplayTextFill;
 
    KIFONT::FONT* font = aText->GetDrawFont( &m_pcbSettings );
 
    m_gal->SetStrokeColor( color );
    m_gal->SetFillColor( color );
    attrs.m_Angle = aText->GetDrawRotation();
 
    if( aText->IsKnockout() )
    {
        const SHAPE_POLY_SET& finalPoly = aText->GetKnockoutCache( font, resolvedText, m_maxError );
 
        m_gal->SetIsStroke( false );
        m_gal->SetIsFill( true );
        m_gal->DrawPolygon( finalPoly );
    }
    else
    {
        if( outline_mode )
            attrs.m_StrokeWidth = m_pcbSettings.m_outlineWidth;
        else
            attrs.m_StrokeWidth = getLineThickness( aText->GetEffectiveTextPenWidth() );
 
        if( m_gal->IsFlippedX() && !aText->IsSideSpecific() )
        {
            // We do not want to change the mirroring for this kind of text
            // on the mirrored canvas
            // (not mirrored is draw not mirrored and mirrored is draw mirrored)
            // So we need to recalculate the text position to keep it at the same position
            // on the canvas
            VECTOR2I textPos = aText->GetTextPos();
            VECTOR2I textWidth = VECTOR2I( aText->GetTextBox( &m_pcbSettings ).GetWidth(), 0 );
 
            if( aText->GetHorizJustify() == GR_TEXT_H_ALIGN_RIGHT )
                textWidth.x = -textWidth.x;
            else if( aText->GetHorizJustify() == GR_TEXT_H_ALIGN_CENTER )
                textWidth.x = 0;
 
            RotatePoint( textWidth, VECTOR2I( 0, 0 ), aText->GetDrawRotation() );
 
            if( attrs.m_Mirrored )
                textPos -= textWidth;
            else
                textPos += textWidth;
 
            attrs.m_Mirrored = !attrs.m_Mirrored;
            strokeText( resolvedText, textPos, attrs, metrics );
            return;
        }
 
        std::vector<std::unique_ptr<KIFONT::GLYPH>>* cache = nullptr;
 
        if( font->IsOutline() )
            cache = aText->GetRenderCache( font, resolvedText );
 
        if( cache )
        {
            m_gal->SetLineWidth( attrs.m_StrokeWidth );
            m_gal->DrawGlyphs( *cache );
        }
        else
        {
            strokeText( resolvedText, aText->GetTextPos(), attrs, metrics );
        }
    }
 
    // Draw the umbilical line for texts in footprints
    FOOTPRINT* fp_parent = aText->GetParentFootprint();
 
    if( fp_parent && aText->IsSelected() )
    {
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
        m_gal->SetStrokeColor( m_pcbSettings.GetColor( nullptr, LAYER_ANCHOR ) );
        m_gal->DrawLine( aText->GetTextPos(), fp_parent->GetPosition() );
    }
}
 
 
void PCB_PAINTER::draw( const PCB_TEXTBOX* aTextBox, int aLayer )
{
    if( aTextBox->Type() == PCB_TABLECELL_T )
    {
        const PCB_TABLECELL* cell = static_cast<const PCB_TABLECELL*>( aTextBox );
 
        if( cell->GetColSpan() == 0 || cell->GetRowSpan() == 0 )
            return;
    }
 
    COLOR4D       color = m_pcbSettings.GetColor( aTextBox, aLayer );
    int           thickness = getLineThickness( aTextBox->GetWidth() );
    LINE_STYLE    lineStyle = aTextBox->GetStroke().GetLineStyle();
    wxString      resolvedText( aTextBox->GetShownText( FOR_CANVAS ) );
    KIFONT::FONT* font = aTextBox->GetDrawFont( &m_pcbSettings );
 
    if( aLayer == LAYER_LOCKED_ITEM_SHADOW )    // happens only if locked
    {
        const COLOR4D sh_color = m_pcbSettings.GetColor( aTextBox, aLayer );
 
        m_gal->SetIsFill( true );
        m_gal->SetIsStroke( false );
        m_gal->SetFillColor( sh_color );
        m_gal->SetStrokeColor( sh_color );
 
        // Draw the box with a larger thickness than box thickness to show
        // the shadow mask
        std::vector<VECTOR2I> pts = aTextBox->GetCorners();
        int line_thickness = std::max( thickness*3, pcbIUScale.mmToIU( 0.2 ) );
 
        std::deque<VECTOR2D> dpts;
 
        for( const VECTOR2I& pt : pts )
            dpts.push_back( VECTOR2D( pt ) );
 
        dpts.push_back( VECTOR2D( pts[0] ) );
 
        m_gal->SetIsStroke( true );
        m_gal->SetLineWidth( line_thickness );
        m_gal->DrawPolygon( dpts );
    }
 
    m_gal->SetFillColor( color );
    m_gal->SetStrokeColor( color );
    m_gal->SetIsFill( true );
    m_gal->SetIsStroke( false );
 
    if( aTextBox->Type() != PCB_TABLECELL_T && aTextBox->IsBorderEnabled() )
    {
        if( lineStyle <= LINE_STYLE::FIRST_TYPE )
        {
            if( thickness > 0 )
            {
                std::vector<VECTOR2I> pts = aTextBox->GetCorners();
 
                for( size_t ii = 0; ii < pts.size(); ++ii )
                    m_gal->DrawSegment( pts[ii], pts[( ii + 1 ) % pts.size()], thickness );
            }
        }
        else
        {
            std::vector<SHAPE*> shapes = aTextBox->MakeEffectiveShapes( true );
 
            for( SHAPE* shape : shapes )
            {
                STROKE_PARAMS::Stroke( shape, lineStyle, thickness, &m_pcbSettings,
                                       [&]( const VECTOR2I& a, const VECTOR2I& b )
                                       {
                                           m_gal->DrawSegment( a, b, thickness );
                                       } );
            }
 
            for( SHAPE* shape : shapes )
                delete shape;
        }
    }
 
    if( aLayer == LAYER_LOCKED_ITEM_SHADOW )
    {
        // For now, the textbox is a filled shape.
        // so the text drawn on LAYER_LOCKED_ITEM_SHADOW with a thick width is disabled
        // If enabled, the thick text position must be offsetted to be exactly on the
        // initial text, which is not easy, depending on its rotation and justification.
#if 0
        const COLOR4D sh_color = m_pcbSettings.GetColor( aTextBox, aLayer );
        m_canvas->SetFillColor( sh_color );
        m_canvas->SetStrokeColor( sh_color );
        attrs.m_StrokeWidth += m_lockedShadowMargin;
#else
        return;
#endif
    }
 
    if( aTextBox->IsKnockout() )
    {
        SHAPE_POLY_SET finalPoly;
        aTextBox->TransformTextToPolySet( finalPoly, 0, m_maxError, ERROR_INSIDE );
        finalPoly.Fracture();
 
        m_gal->SetIsStroke( false );
        m_gal->SetIsFill( true );
        m_gal->DrawPolygon( finalPoly );
    }
    else
    {
        if( resolvedText.Length() == 0 )
            return;
 
        const KIFONT::METRICS& metrics = aTextBox->GetFontMetrics();
        TEXT_ATTRIBUTES        attrs = aTextBox->GetAttributes();
        // Raw attrs are lib frame for FP children, pull scaled size for render.
        attrs.m_Size = aTextBox->GetTextSize();
        attrs.m_StrokeWidth = getLineThickness( aTextBox->GetEffectiveTextPenWidth() );
 
        if( m_gal->IsFlippedX() && !aTextBox->IsSideSpecific() )
        {
            attrs.m_Mirrored = !attrs.m_Mirrored;
            strokeText( resolvedText, aTextBox->GetDrawPos( true ), attrs, metrics );
            return;
        }
 
        std::vector<std::unique_ptr<KIFONT::GLYPH>>* cache = nullptr;
 
        if( font->IsOutline() )
            cache = aTextBox->GetRenderCache( font, resolvedText );
 
        if( cache )
        {
            m_gal->SetLineWidth( attrs.m_StrokeWidth );
            m_gal->DrawGlyphs( *cache );
        }
        else
        {
            strokeText( resolvedText, aTextBox->GetDrawPos(), attrs, metrics );
        }
    }
}
 
void PCB_PAINTER::draw( const PCB_TABLE* aTable, int aLayer )
{
    if( aTable->GetCells().empty() )
        return;
 
    for( PCB_TABLECELL* cell : aTable->GetCells() )
    {
        if( cell->GetColSpan() > 0 || cell->GetRowSpan() > 0 )
            draw( static_cast<PCB_TEXTBOX*>( cell ), aLayer );
    }
 
    COLOR4D color = m_pcbSettings.GetColor( aTable, aLayer );
 
    aTable->DrawBorders(
            [&]( const VECTOR2I& ptA, const VECTOR2I& ptB, const STROKE_PARAMS& stroke )
            {
                int        lineWidth = getLineThickness( stroke.GetWidth() );
                LINE_STYLE lineStyle = stroke.GetLineStyle();
 
                m_gal->SetIsFill( false );
                m_gal->SetIsStroke( true );
                m_gal->SetStrokeColor( color );
                m_gal->SetLineWidth( lineWidth );
 
                if( lineStyle <= LINE_STYLE::FIRST_TYPE )
                {
                    m_gal->DrawLine( ptA, ptB );
                }
                else
                {
                    SHAPE_SEGMENT seg( ptA, ptB );
 
                    STROKE_PARAMS::Stroke( &seg, lineStyle, lineWidth, &m_pcbSettings,
                            [&]( const VECTOR2I& a, const VECTOR2I& b )
                            {
                                // DrawLine has problem with 0 length lines so enforce minimum
                                if( a == b )
                                    m_gal->DrawLine( a+1, b );
                                else
                                    m_gal->DrawLine( a, b );
                            } );
                }
            } );
 
    // Highlight selected tablecells with a background wash.
    for( PCB_TABLECELL* cell : aTable->GetCells() )
    {
        if( aTable->IsSelected() || cell->IsSelected() )
        {
            std::vector<VECTOR2I> corners = cell->GetCorners();
            std::deque<VECTOR2D>  pts;
 
            pts.insert( pts.end(), corners.begin(), corners.end() );
 
            m_gal->SetFillColor( color.WithAlpha( 0.5 ) );
            m_gal->SetIsFill( true );
            m_gal->SetIsStroke( false );
            m_gal->DrawPolygon( pts );
        }
    }
}
 
 
void PCB_PAINTER::draw( const FOOTPRINT* aFootprint, int aLayer )
{
    if( aLayer == LAYER_ANCHOR )
    {
        const COLOR4D color = m_pcbSettings.GetColor( aFootprint, aLayer );
 
        // Keep the size and width constant, not related to the scale because the anchor
        // is just a marker on screen
        double anchorSize = 5.0 / m_gal->GetWorldScale();           // 5 pixels size
        double anchorThickness = 1.0 / m_gal->GetWorldScale();      // 1 pixels width
 
        // Draw anchor
        m_gal->SetIsFill( false );
        m_gal->SetIsStroke( true );
        m_gal->SetStrokeColor( color );
        m_gal->SetLineWidth( anchorThickness );
 
        VECTOR2D center = aFootprint->GetPosition();
        m_gal->DrawLine( center - VECTOR2D( anchorSize, 0 ), center + VECTOR2D( anchorSize, 0 ) );
        m_gal->DrawLine( center - VECTOR2D( 0, anchorSize ), center + VECTOR2D( 0, anchorSize ) );
    }
 
    if( aLayer == LAYER_LOCKED_ITEM_SHADOW && m_frameType == FRAME_PCB_EDITOR )    // happens only if locked
    {
        const COLOR4D color = m_pcbSettings.GetColor( aFootprint, aLayer );
 
        m_gal->SetIsFill( true );
        m_gal->SetIsStroke( false );
        m_gal->SetFillColor( color );
 
#if 0 // GetBoundingHull() can be very slow, especially for logos imported from graphics
        const SHAPE_POLY_SET& poly = aFootprint->GetBoundingHull();
        m_canvas->DrawPolygon( poly );
#else
        BOX2I    bbox = aFootprint->GetBoundingBox( false );
        VECTOR2I topLeft = bbox.GetPosition();
        VECTOR2I botRight = bbox.GetPosition() + bbox.GetSize();
 
        m_gal->DrawRectangle( topLeft, botRight );
 
        // Use segments to produce a margin with rounded corners
        m_gal->DrawSegment( topLeft, VECTOR2I( botRight.x, topLeft.y ), m_lockedShadowMargin );
        m_gal->DrawSegment( VECTOR2I( botRight.x, topLeft.y ), botRight, m_lockedShadowMargin );
        m_gal->DrawSegment( botRight, VECTOR2I( topLeft.x, botRight.y ), m_lockedShadowMargin );
        m_gal->DrawSegment( VECTOR2I( topLeft.x, botRight.y ), topLeft, m_lockedShadowMargin );
#endif
    }
 
    if( aLayer == LAYER_CONFLICTS_SHADOW && aFootprint->IsConflicting() )
    {
        const SHAPE_POLY_SET& frontpoly = aFootprint->GetCourtyard( F_CrtYd );
        const SHAPE_POLY_SET& backpoly = aFootprint->GetCourtyard( B_CrtYd );
 
        const COLOR4D color = m_pcbSettings.GetColor( aFootprint, aLayer );
 
        m_gal->SetIsFill( true );
        m_gal->SetIsStroke( false );
        m_gal->SetFillColor( color );
 
        if( frontpoly.OutlineCount() > 0 )
            m_gal->DrawPolygon( frontpoly );
 
        if( backpoly.OutlineCount() > 0 )
            m_gal->DrawPolygon( backpoly );
    }
}
 
 
void PCB_PAINTER::draw( const PCB_GROUP* aGroup, int aLayer )
{
    if( aLayer == LAYER_ANCHOR )
    {
        if( aGroup->IsSelected() && !( aGroup->GetParent() && aGroup->GetParent()->IsSelected() ) )
        {
            // Selected on our own; draw enclosing box
        }
        else if( aGroup->IsEntered() )
        {
            // Entered group; draw enclosing box
        }
        else
        {
            // Neither selected nor entered; draw nothing at the group level (ie: only draw
            // its members)
            return;
        }
 
        const COLOR4D color = m_pcbSettings.GetColor( aGroup, LAYER_ANCHOR );
 
        m_gal->SetStrokeColor( color );
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth * 2.0f );
 
        BOX2I    bbox = aGroup->GetBoundingBox();
        VECTOR2I topLeft = bbox.GetPosition();
        VECTOR2I width = VECTOR2I( bbox.GetWidth(), 0 );
        VECTOR2I height = VECTOR2I( 0, bbox.GetHeight() );
 
        m_gal->DrawLine( topLeft, topLeft + width );
        m_gal->DrawLine( topLeft + width, topLeft + width + height );
        m_gal->DrawLine( topLeft + width + height, topLeft + height );
        m_gal->DrawLine( topLeft + height, topLeft );
 
        wxString name = aGroup->GetName();
 
        if( name.IsEmpty() )
            return;
 
        int ptSize = 12;
        int scaledSize = abs( KiROUND( m_gal->GetScreenWorldMatrix().GetScale().x * ptSize ) );
        int unscaledSize = pcbIUScale.MilsToIU( ptSize );
 
        // Scale by zoom a bit, but not too much
        int      textSize = ( scaledSize + ( unscaledSize * 2 ) ) / 3;
        VECTOR2I textOffset = KiROUND( width.x / 2.0, -textSize * 0.5 );
        VECTOR2I titleHeight = KiROUND( 0.0, textSize * 2.0 );
 
        if( PrintableCharCount( name ) * textSize < bbox.GetWidth() )
        {
            m_gal->DrawLine( topLeft, topLeft - titleHeight );
            m_gal->DrawLine( topLeft - titleHeight, topLeft + width - titleHeight );
            m_gal->DrawLine( topLeft + width - titleHeight, topLeft + width );
 
            TEXT_ATTRIBUTES attrs;
            attrs.m_Italic = true;
            attrs.m_Halign = GR_TEXT_H_ALIGN_CENTER;
            attrs.m_Valign = GR_TEXT_V_ALIGN_BOTTOM;
            attrs.m_Size = VECTOR2I( textSize, textSize );
            attrs.m_StrokeWidth = GetPenSizeForNormal( textSize );
 
            KIFONT::FONT::GetFont()->Draw( m_gal, aGroup->GetName(), topLeft + textOffset, attrs,
                                           aGroup->GetFontMetrics() );
        }
    }
}
 
 
bool KIGFX::ZoneOutlineDrawnOnLayer( bool aOutlineOnly, int aLayer )
{
    if( aOutlineOnly )
        return IsZoneFillLayer( aLayer );
 
    return !IsZoneFillLayer( aLayer );
}
 
 
void PCB_PAINTER::draw( const ZONE* aZone, int aLayer )
{
    SHAPE_POLY_SET        zoneOutlineStorage;
    const SHAPE_POLY_SET* zoneOutline = &zoneOutlineStorage;
 
    if( aZone->GetParentFootprint() )
        zoneOutlineStorage = aZone->GetBoardOutline();
    else
        zoneOutline = aZone->Outline();
 
    if( aLayer == LAYER_CONFLICTS_SHADOW )
    {
        if( aZone->IsConflicting() && aZone->GetIsRuleArea() )
        {
            COLOR4D color = m_pcbSettings.GetColor( aZone, aLayer );
 
            m_gal->SetIsFill( true );
            m_gal->SetIsStroke( false );
            m_gal->SetFillColor( color );
 
            m_gal->DrawPolygon( zoneOutline->Outline( 0 ) );
        }
 
        return;
    }
 
    /*
     * aLayer will be the virtual zone layer (LAYER_ZONE_START, ... in GAL_LAYER_ID)
     * This is used for draw ordering in the GAL.
     * The color for the zone comes from the associated copper layer ( aLayer - LAYER_ZONE_START )
     * and the visibility comes from the combination of that copper layer and LAYER_ZONES
     */
    PCB_LAYER_ID layer;
 
    if( IsZoneFillLayer( aLayer ) )
        layer = ToLAYER_ID( aLayer - LAYER_ZONE_START );
    else
        layer = ToLAYER_ID( aLayer );
 
    if( !aZone->IsOnLayer( layer ) )
        return;
 
    COLOR4D              color = m_pcbSettings.GetColor( aZone, layer );
    std::deque<VECTOR2D> corners;
    ZONE_DISPLAY_MODE    displayMode = m_pcbSettings.m_ZoneDisplayMode;
 
    if( aZone->IsTeardropArea() )
        displayMode = ZONE_DISPLAY_MODE::SHOW_FILLED;
 
    // A zone whose only visual is its outline (rule area, or outline-only display) draws it on
    // the zone layer, above copper, so tracks and pads can't paint over it.
    bool outlineOnly = aZone->GetIsRuleArea() || displayMode == ZONE_DISPLAY_MODE::SHOW_ZONE_OUTLINE;
 
    // Draw the outline
    if( ZoneOutlineDrawnOnLayer( outlineOnly, aLayer ) )
    {
        bool allowDrawOutline = aZone->GetHatchStyle() != ZONE_BORDER_DISPLAY_STYLE::INVISIBLE_BORDER;
 
        if( allowDrawOutline && !m_pcbSettings.m_isPrinting && zoneOutline && zoneOutline->OutlineCount() > 0 )
        {
            m_gal->SetStrokeColor( color.a > 0.0 ? color.WithAlpha( 1.0 ) : color );
            m_gal->SetIsFill( false );
            m_gal->SetIsStroke( true );
            m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
 
            // Draw each contour (main contour and holes)
 
            /*
             * m_canvas->DrawPolygon( *outline );
             * should be enough, but currently does not work to draw holes contours in a complex
             * polygon so each contour is draw as a simple polygon
             */
 
            // Draw the main contour(s?)
            for( int ii = 0; ii < zoneOutline->OutlineCount(); ++ii )
            {
                m_gal->DrawPolyline( zoneOutline->COutline( ii ) );
 
                // Draw holes
                int holes_count = zoneOutline->HoleCount( ii );
 
                for( int jj = 0; jj < holes_count; ++jj )
                    m_gal->DrawPolyline( zoneOutline->CHole( ii, jj ) );
        }
 
            // Draw hatch lines
            for( const SEG& hatchLine : aZone->GetHatchLines() )
                m_gal->DrawLine( hatchLine.A, hatchLine.B );
        }
    }
 
    // Draw the filling
    if( IsZoneFillLayer( aLayer )
            && ( displayMode == ZONE_DISPLAY_MODE::SHOW_FILLED
                || displayMode == ZONE_DISPLAY_MODE::SHOW_FRACTURE_BORDERS
                || displayMode == ZONE_DISPLAY_MODE::SHOW_TRIANGULATION ) )
    {
        const std::shared_ptr<SHAPE_POLY_SET>& polySet = aZone->GetFilledPolysList( layer );
 
        if( polySet->OutlineCount() == 0 )  // Nothing to draw
            return;
 
        m_gal->SetStrokeColor( color );
        m_gal->SetFillColor( color );
        m_gal->SetLineWidth( 0 );
 
        if( displayMode == ZONE_DISPLAY_MODE::SHOW_FILLED )
        {
            m_gal->SetIsFill( true );
            m_gal->SetIsStroke( false );
        }
        else
        {
            m_gal->SetIsFill( false );
            m_gal->SetIsStroke( true );
        }
 
        // On Opengl, a not convex filled polygon is usually drawn by using triangles
        // as primitives. CacheTriangulation() can create basic triangle primitives to
        // draw the polygon solid shape on Opengl.  GLU tessellation is much slower,
        // so currently we are using our tessellation.
        if( m_gal->IsOpenGlEngine() && !polySet->IsTriangulationUpToDate() )
            polySet->CacheTriangulation( true );
 
        m_gal->DrawPolygon( *polySet, displayMode == ZONE_DISPLAY_MODE::SHOW_TRIANGULATION );
    }
}
 
 
void PCB_PAINTER::draw( const PCB_BARCODE* aBarcode, int aLayer )
{
    const COLOR4D& color = m_pcbSettings.GetColor( aBarcode, aLayer );
 
    m_gal->SetIsFill( true );
    m_gal->SetIsStroke( false );
    m_gal->SetFillColor( color );
 
    // Draw the barcode
    SHAPE_POLY_SET shape;
 
    if( aLayer == LAYER_LOCKED_ITEM_SHADOW )
        aBarcode->GetBoundingHull( shape, aBarcode->GetLayer(), m_lockedShadowMargin, m_maxError, ERROR_INSIDE );
    else
        aBarcode->TransformShapeToPolySet( shape, aBarcode->GetLayer(), 0, m_maxError, ERROR_INSIDE );
 
    if( shape.OutlineCount() != 0 )
        m_gal->DrawPolygon( shape );
}
 
 
void PCB_PAINTER::draw( const PCB_DIMENSION_BASE* aDimension, int aLayer )
{
    COLOR4D color = m_pcbSettings.GetColor( aDimension, aLayer );
 
    if( aLayer == LAYER_LOCKED_ITEM_SHADOW || aLayer == LAYER_CONSTRAINT_SHADOW )
    {
        int margin = m_lockedShadowMargin;
 
        if( aLayer == LAYER_CONSTRAINT_SHADOW
            && m_pcbSettings.GetHighlightedConstraintMembers().count( aDimension->m_Uuid ) )
        {
            color = color.Brightened( 0.5 );
            margin *= 2;
        }
 
        m_gal->SetIsFill( true );
        m_gal->SetIsStroke( true );
        m_gal->SetFillColor( color );
        m_gal->SetStrokeColor( color );
        m_gal->SetLineWidth( margin );
 
        for( const std::shared_ptr<SHAPE>& shape : aDimension->GetShapes() )
        {
            switch( shape->Type() )
            {
            case SH_SEGMENT:
            {
                const SEG& seg = static_cast<const SHAPE_SEGMENT*>( shape.get() )->GetSeg();
                m_gal->DrawSegment( seg.A, seg.B, margin );
                break;
            }
 
            case SH_CIRCLE:
            {
                int radius = static_cast<const SHAPE_CIRCLE*>( shape.get() )->GetRadius();
                m_gal->DrawCircle( shape->Centre(), radius );
                break;
            }
 
            default: break;
            }
        }
 
        SHAPE_POLY_SET poly;
        aDimension->PCB_TEXT::TransformShapeToPolygon( poly, aDimension->GetLayer(), 0, m_maxError, ERROR_OUTSIDE );
        m_gal->DrawPolygon( poly );
 
        return;
    }
 
    m_gal->SetStrokeColor( color );
    m_gal->SetFillColor( color );
    m_gal->SetIsFill( false );
    m_gal->SetIsStroke( true );
 
    bool outline_mode = !viewer_settings()->m_ViewersDisplay.m_DisplayGraphicsFill;
 
    if( outline_mode )
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
    else
        m_gal->SetLineWidth( getLineThickness( aDimension->GetLineThickness() ) );
 
    // Draw dimension shapes
    // TODO(JE) lift this out
    for( const std::shared_ptr<SHAPE>& shape : aDimension->GetShapes() )
    {
        switch( shape->Type() )
        {
        case SH_SEGMENT:
        {
            const SEG& seg = static_cast<const SHAPE_SEGMENT*>( shape.get() )->GetSeg();
            m_gal->DrawLine( seg.A, seg.B );
            break;
        }
 
        case SH_CIRCLE:
        {
            int radius = static_cast<const SHAPE_CIRCLE*>( shape.get() )->GetRadius();
            m_gal->DrawCircle( shape->Centre(), radius );
            break;
        }
 
        default:
            break;
        }
    }
 
    // Draw text
    wxString        resolvedText = aDimension->GetShownText( FOR_CANVAS );
    TEXT_ATTRIBUTES attrs = aDimension->GetAttributes();
 
    if( m_gal->IsFlippedX() && !aDimension->IsSideSpecific() )
        attrs.m_Mirrored = !attrs.m_Mirrored;
 
    if( outline_mode )
        attrs.m_StrokeWidth = m_pcbSettings.m_outlineWidth;
    else
        attrs.m_StrokeWidth = getLineThickness( aDimension->GetEffectiveTextPenWidth() );
 
    std::vector<std::unique_ptr<KIFONT::GLYPH>>* cache = nullptr;
 
    if( aDimension->GetFont() && aDimension->GetFont()->IsOutline() )
        cache = aDimension->GetRenderCache( aDimension->GetFont(), resolvedText );
 
    if( cache )
    {
        for( const std::unique_ptr<KIFONT::GLYPH>& glyph : *cache )
            m_gal->DrawGlyph( *glyph );
    }
    else
    {
        strokeText( resolvedText, aDimension->GetTextPos(), attrs, aDimension->GetFontMetrics() );
    }
}
 
 
void PCB_PAINTER::draw( const PCB_GRID_ITEM* aGridItem, int aLayer )
{
    // Grid content (lines/dots/crosses) is rendered by the GAL backend through
    // GRID_SOURCE (see PCB_DRAW_PANEL_GAL::prepareGridSources).  Only selection
    // decorations - outline and centre marker - live here, on LAYER_GRID_ITEMS.
    // The item is also registered on m_layer for VIEW::Query (selection); skip
    // those passes.
    const bool shadow = aLayer == LAYER_LOCKED_ITEM_SHADOW; // happens only if locked
 
    if( aLayer != LAYER_SUBGRIDS && !shadow )
        return;
 
    if( !shadow && !aGridItem->IsSelected() )
        return;
 
    m_gal->SetLineWidth( shadow ? (float) m_lockedShadowMargin : m_pcbSettings.m_outlineWidth );
    m_gal->SetStrokeColor( m_pcbSettings.GetColor( aGridItem, aLayer ) );
    m_gal->SetIsFill( false );
    m_gal->SetIsStroke( true );
 
    m_gal->Save();
    m_gal->Translate( VECTOR2D( aGridItem->GetPosition() ) );
    // GAL::Rotate is math-convention; grid orientation is screen-convention - negate.
    m_gal->Rotate( -aGridItem->GetOrientation().AsRadians() );
 
    switch( aGridItem->GetGridItemType() )
    {
    case PCB_GRID_TYPE::POLAR:
    {
        // hairline outline at the maximum radius, only over the active phi range
        const int    radius = aGridItem->GetRadiusExtent();
        const double phiMax = aGridItem->GetPhiExtent().AsRadians();
        m_gal->DrawArc( VECTOR2D( 0, 0 ), radius, EDA_ANGLE( 0, RADIANS_T ), EDA_ANGLE( phiMax, RADIANS_T ) );
 
        // bounding "pie" radials when phi is less than full circle
        if( phiMax + 1e-9 < 2 * M_PI )
        {
            m_gal->DrawLine( VECTOR2D( 0, 0 ), VECTOR2D( radius, 0 ) );
            m_gal->DrawLine( VECTOR2D( 0, 0 ), VECTOR2D( radius * std::cos( phiMax ), radius * std::sin( phiMax ) ) );
        }
        break;
    }
 
    case PCB_GRID_TYPE::CARTESIAN:
    {
        // hairline outline rectangle centred on the grid origin
        const VECTOR2I extent = aGridItem->GetExtent();
        m_gal->DrawLine( VECTOR2D( -extent.x, -extent.y ), VECTOR2D( extent.x, -extent.y ) );
        m_gal->DrawLine( VECTOR2D( extent.x, -extent.y ), VECTOR2D( extent.x, extent.y ) );
        m_gal->DrawLine( VECTOR2D( extent.x, extent.y ), VECTOR2D( -extent.x, extent.y ) );
        m_gal->DrawLine( VECTOR2D( -extent.x, extent.y ), VECTOR2D( -extent.x, -extent.y ) );
        break;
    }
 
    default:
        wxFAIL_MSG( wxT( "draw(PCB_GRID_ITEM*): unhandled PCB_GRID_TYPE" ) );
        break;
    }
 
    if( shadow )
    {
        m_gal->Restore();
        return;
    }
 
    // Centre marker: screen-pixel-sized '+' cross in the LAYER_ANCHOR color, same
    // convention FOOTPRINT uses for its anchor (see draw(FOOTPRINT*)).
    const double  anchorSize = 5.0 / m_gal->GetWorldScale();
    const double  anchorThickness = 1.0 / m_gal->GetWorldScale();
    const COLOR4D anchorColor = m_pcbSettings.GetColor( aGridItem, LAYER_ANCHOR );
 
    m_gal->SetStrokeColor( anchorColor );
    m_gal->SetLineWidth( anchorThickness );
    m_gal->DrawLine( VECTOR2D( -anchorSize, 0 ), VECTOR2D( anchorSize, 0 ) );
    m_gal->DrawLine( VECTOR2D( 0, -anchorSize ), VECTOR2D( 0, anchorSize ) );
 
    m_gal->Restore();
}
 
 
void PCB_PAINTER::draw( const PCB_TARGET* aTarget )
{
    const COLOR4D strokeColor = m_pcbSettings.GetColor( aTarget, aTarget->GetLayer() );
    VECTOR2D position( aTarget->GetPosition() );
    double   size, radius;
 
    m_gal->SetLineWidth( getLineThickness( aTarget->GetWidth() ) );
    m_gal->SetStrokeColor( strokeColor );
    m_gal->SetIsFill( false );
    m_gal->SetIsStroke( true );
 
    m_gal->Save();
    m_gal->Translate( position );
 
    if( aTarget->GetShape() )
    {
        // shape x
        m_gal->Rotate( M_PI / 4.0 );
        size   = 2.0 * aTarget->GetSize() / 3.0;
        radius = aTarget->GetSize() / 2.0;
    }
    else
    {
        // shape +
        size   = aTarget->GetSize() / 2.0;
        radius = aTarget->GetSize() / 3.0;
    }
 
    m_gal->DrawLine( VECTOR2D( -size, 0.0 ), VECTOR2D( size, 0.0 ) );
    m_gal->DrawLine( VECTOR2D( 0.0, -size ), VECTOR2D( 0.0,  size ) );
    m_gal->DrawCircle( VECTOR2D( 0.0, 0.0 ), radius );
 
    m_gal->Restore();
}
 
 
void PCB_PAINTER::draw( const PCB_POINT* aPoint, int aLayer )
{
    // aLayer will be the virtual point layer (LAYER_POINT_START, ... in GAL_LAYER_ID).
    // This is used for draw ordering in the GAL.
    // The cross color comes from LAYER_POINTS and the ring color follows the point's board layer.
    // Visibility comes from the combination of that board layer and LAYER_POINTS.
 
    double size = (double)aPoint->GetSize() / 2;
 
    // Keep the width constant, not related to the scale because the anchor
    // is just a marker on screen, just draw in pixels
    double thickness = m_pcbSettings.m_outlineWidth;
 
    // The general "points" colour
    COLOR4D crossColor = m_pcbSettings.GetColor( aPoint, LAYER_POINTS );
    // The colour for the ring around the point follows the "real" layer of the point
    COLOR4D ringColor = m_pcbSettings.GetColor( aPoint, aPoint->GetLayer() );
 
    if( aLayer == LAYER_LOCKED_ITEM_SHADOW )
    {
        thickness += m_lockedShadowMargin;
        crossColor = m_pcbSettings.GetColor( aPoint, aLayer );
        ringColor = m_pcbSettings.GetColor( aPoint, aLayer );
    }
 
    VECTOR2D position( aPoint->GetPosition() );
 
    m_gal->SetLineWidth( (float) thickness );
    m_gal->SetStrokeColor( crossColor );
    m_gal->SetIsFill( false );
    m_gal->SetIsStroke( true );
 
    m_gal->Save();
    m_gal->Translate( position );
 
    // Draw as X to make it clearer when overlaid on cursor or axes
    m_gal->DrawLine( VECTOR2D( -size, -size ), VECTOR2D( size, size ) );
    m_gal->DrawLine( VECTOR2D( size, -size ), VECTOR2D( -size, size ) );
 
    // Draw the circle in the layer colour
    m_gal->SetStrokeColor( ringColor );
    m_gal->DrawCircle( VECTOR2D( 0.0, 0.0 ), size / 2 );
 
    m_gal->Restore();
}
 
 
void PCB_PAINTER::draw( const PCB_MARKER* aMarker, int aLayer )
{
    // Don't paint invisible markers.
    // It would be nice to do this through layer dependencies but we can't do an "or" there today
    if( aMarker->GetBoard() && !aMarker->GetBoard()->IsElementVisible( aMarker->GetColorLayer() ) )
        return;
 
    // The active marker is redrawn on LAYER_DRC_HIGHLIGHTED so it lands on top of any
    // neighbouring inactive markers
    if( aLayer == LAYER_DRC_HIGHLIGHTED && !aMarker->IsBrightened() && !aMarker->IsSelected() )
        return;
 
    bool             isShadow = aLayer == LAYER_MARKER_SHADOWS;
    COLOR4D          color = m_pcbSettings.GetColor( aMarker, aMarker->GetColorLayer() );
    COLOR4D          shadowColor = m_pcbSettings.GetColor( aMarker, LAYER_MARKER_SHADOWS );
    SHAPE_LINE_CHAIN polygon;
 
    aMarker->SetZoom( 1.0 / sqrt( m_gal->GetZoomFactor() ) );
    aMarker->ShapeToPolygon( polygon );
 
    m_gal->Save();
    m_gal->Translate( aMarker->GetPosition() );
 
    m_gal->SetStrokeColor( shadowColor );
    m_gal->SetFillColor( color );
 
    if( isShadow )
    {
        m_gal->SetIsFill( false );
        m_gal->SetIsStroke( true );
        m_gal->SetLineWidth( (float) aMarker->MarkerScale() );
    }
    else
    {
        m_gal->SetIsFill( true );
        m_gal->SetIsStroke( false );
    }
 
    m_gal->DrawPolygon( polygon );
    m_gal->Restore();
 
    // Draw the error legend shapes.
    if( aLayer == LAYER_DRC_HIGHLIGHTED )
    {
        COLOR4D legendColor = m_pcbSettings.m_backgroundColor;
        double  bg_h, bg_s, bg_l;
        COLOR4D haloColor;
 
        legendColor.ToHSL( bg_h, bg_s, bg_l );
        haloColor.FromHSL( bg_h, bg_s, bg_l < 0.5 ? 1.0 : 0.0 );
 
        m_gal->SetLineWidth( (float) aMarker->MarkerScale() / 3.0f );
        m_gal->SetStrokeColor( legendColor.WithAlpha( 1.0 ) );
        m_gal->SetFillColor( haloColor.WithAlpha( 0.5 ) );
 
        for( const PCB_SHAPE& shape : aMarker->GetErrorLegendShapes() )
        {
            if( shape.GetStroke().GetWidth() == 1.0 )   // Item is a legend graphic
            {
                m_gal->SetIsFill( false );
                m_gal->SetIsStroke( true );
 
                if( shape.GetShape() == SHAPE_T::SEGMENT )
                {
                    m_gal->DrawLine( shape.GetStart(), shape.GetEnd() );
                }
                else if( shape.GetShape() == SHAPE_T::ARC )
                {
                    EDA_ANGLE startAngle, endAngle;
                    shape.CalcArcAngles( startAngle, endAngle );
 
                    m_gal->DrawArc( shape.GetCenter(), shape.GetRadius(), startAngle, shape.GetArcAngle() );
                }
            }
            else    // Item is a highlight halo
            {
                m_gal->SetIsFill( true );
                m_gal->SetIsStroke( false );
 
                if( shape.GetShape() == SHAPE_T::SEGMENT )
                {
                    m_gal->DrawSegment( shape.GetStart(), shape.GetEnd(), shape.GetWidth() );
                }
                else if( shape.GetShape() == SHAPE_T::ARC )
                {
                    EDA_ANGLE startAngle, endAngle;
                    shape.CalcArcAngles( startAngle, endAngle );
 
                    m_gal->DrawArcSegment( shape.GetCenter(), shape.GetRadius(), startAngle, shape.GetArcAngle(),
                                           shape.GetWidth(), ARC_HIGH_DEF );
                }
            }
        }
    }
}
 
 
void PCB_PAINTER::draw( const PCB_BOARD_OUTLINE* aBoardOutline, int aLayer )
{
    if( !aBoardOutline->HasOutline() )
        return;
 
    // aBoardOutline makes sense only for the board editor. for fp holder boards
    // there are no board outlines area.
    const BOARD* brd = aBoardOutline->GetBoard();
 
    if( !brd || brd->GetBoardUse() == BOARD_USE::FPHOLDER )
        return;
 
    GAL_SCOPED_ATTRS scopedAttrs( *m_gal, GAL_SCOPED_ATTRS::ALL_ATTRS );
    m_gal->Save();
 
    const COLOR4D& outlineColor = m_pcbSettings.GetColor( aBoardOutline, aLayer );
    m_gal->SetFillColor( outlineColor );
    m_gal->AdvanceDepth();
    m_gal->SetLineWidth( 0 );
    m_gal->SetIsFill( true );
    m_gal->SetIsStroke( false );
    m_gal->DrawPolygon( aBoardOutline->GetOutline() );
 
    m_gal->Restore();
}
 
 
void PCB_PAINTER::drawBackdrillIndicator( const BOARD_ITEM* aItem, const VECTOR2D& aCenter,
                                          int aDrillSize, PCB_LAYER_ID aStartLayer, PCB_LAYER_ID aEndLayer )
{
    double backdrillRadius = aDrillSize / 2.0;
    double lineWidth = std::max( backdrillRadius / 16.0, m_pcbSettings.m_outlineWidth * 2.0 );
 
    // Inset so entire graphic is within backdrill extent
    backdrillRadius -= lineWidth / 2;
 
    GAL_SCOPED_ATTRS scopedAttrs( *m_gal, GAL_SCOPED_ATTRS::ALL_ATTRS );
    m_gal->AdvanceDepth();
    m_gal->SetIsFill( false );
    m_gal->SetIsStroke( true );
    m_gal->SetLineWidth( (float) lineWidth );
 
    // Draw dashed circle manually with fixed number of segments for consistent appearance
    constexpr int NUM_DASHES = 12;                             // Number of dashes around the circle
    EDA_ANGLE     dashAngle = ANGLE_360 / ( NUM_DASHES * 2 );  // Dash and gap are equal size
 
    for( int i = 0; i < NUM_DASHES; ++i )
    {
        EDA_ANGLE startAngle = dashAngle * ( i * 2 );
        m_gal->SetStrokeColor( m_pcbSettings.GetColor( aItem, i % 2 ? aStartLayer : aEndLayer ) );
        m_gal->DrawArc( aCenter, backdrillRadius, startAngle, dashAngle );
    }
}
 
 
void PCB_PAINTER::drawPostMachiningIndicator( const BOARD_ITEM* aItem, const VECTOR2D& aCenter, PCB_LAYER_ID aLayer )
{
    int size = 0;
 
    // Check to see if the pad or via has a post-machining operation on this layer
    if( const PAD* pad = dynamic_cast<const PAD*>( aItem ) )
        size = pad->GetPostMachiningKnockout( aLayer );
    else if( const PCB_VIA* via = dynamic_cast<const PCB_VIA*>( aItem ) )
        size = via->GetPostMachiningKnockout( aLayer );
 
    if( size <= 0 )
        return;
 
    GAL_SCOPED_ATTRS scopedAttrs( *m_gal, GAL_SCOPED_ATTRS::ALL_ATTRS );
    m_gal->AdvanceDepth();
 
    double pmRadius = size / 2.0;
    // Use a line width proportional to the radius for visibility
    double lineWidth = std::max( pmRadius / 16.0, m_pcbSettings.m_outlineWidth * 2.0 );
 
    // Inset so entire graphic is within post machining extent
    pmRadius -= lineWidth / 2;
 
    COLOR4D layerColor = m_pcbSettings.GetColor( aItem, aLayer );
 
    m_gal->SetIsFill( false );
    m_gal->SetIsStroke( true );
    m_gal->SetStrokeColor( layerColor );
    m_gal->SetLineWidth( (float) lineWidth );
 
    // Draw dashed circle manually with fixed number of segments for consistent appearance
    constexpr int NUM_DASHES = 12;                             // Number of dashes around the circle
    EDA_ANGLE     dashAngle = ANGLE_360 / ( NUM_DASHES * 2 );  // Dash and gap are equal size
 
    for( int i = 0; i < NUM_DASHES; ++i )
    {
        EDA_ANGLE startAngle = dashAngle * ( i * 2 );
        m_gal->DrawArc( aCenter, pmRadius, startAngle, dashAngle );
    }
}
 
 
const double PCB_RENDER_SETTINGS::MAX_FONT_SIZE = pcbIUScale.mmToIU( 10.0 );