kicad/bitmap2component/bitmap2cmp_gui.cpp

/*
 * This program source code file is part of KICAD, a free EDA CAD application.
 *
 * Copyright (C) 1992-2010 jean-pierre.charras
 * Copyright (C) 1992-2019 Kicad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#include <fctsys.h>
#include <macros.h>

#include <pgm_base.h>
#include <confirm.h>
#include <gestfich.h>
#include <wildcards_and_files_ext.h>
#include <bitmap_io.h>
#include <build_version.h>
#include <menus_helpers.h>
#include <kiway.h>
#include <kiface_i.h>

#include <wx/rawbmp.h>
#include <potracelib.h>

#include "bitmap2component.h"

#include "bitmap2cmp_gui_base.h"


#define KEYWORD_FRAME_POSX          wxT( "Bmconverter_Pos_x" )
#define KEYWORD_FRAME_POSY          wxT( "Bmconverter_Pos_y" )
#define KEYWORD_FRAME_SIZEX         wxT( "Bmconverter_Size_x" )
#define KEYWORD_FRAME_SIZEY         wxT( "Bmconverter_Size_y" )
#define KEYWORD_LAST_INPUT_FILE     wxT( "Last_input" )
#define KEYWORD_LAST_OUTPUT_FILE    wxT( "Last_output" )
#define KEYWORD_LAST_FORMAT         wxT( "Last_format" )
#define KEYWORD_LAST_MODLAYER       wxT( "Last_modlayer" )
#define KEYWORD_BINARY_THRESHOLD    wxT( "Threshold" )
#define KEYWORD_BW_NEGATIVE         wxT( "Negative_choice" )

#define DEFAULT_DPI 300     // Default resolution in Bit per inches

extern int bitmap2component( potrace_bitmap_t* aPotrace_bitmap, FILE* aOutfile,
                             OUTPUT_FMT_ID aFormat, int aDpi_X, int aDpi_Y,
                             BMP2CMP_MOD_LAYER aModLayer );

/**
 * Class BM2CMP_FRAME_BASE
 * is the main frame for this application
 */
class BM2CMP_FRAME : public BM2CMP_FRAME_BASE
{
private:
    wxImage         m_Pict_Image;
    wxBitmap        m_Pict_Bitmap;
    wxImage         m_Greyscale_Image;
    wxBitmap        m_Greyscale_Bitmap;
    wxImage         m_NB_Image;
    wxBitmap        m_BN_Bitmap;
    wxSize          m_imageDPI;     // The initial image resolution. When unknown,
                                    // set to DEFAULT_DPI x DEFAULT_DPI per Inch
    bool            m_Negative;
    wxString        m_BitmapFileName;
    wxString        m_ConvertedFileName;
    wxSize          m_frameSize;
    wxPoint         m_framePos;
    std::unique_ptr<wxConfigBase> m_config;

public:
    BM2CMP_FRAME( KIWAY* aKiway, wxWindow* aParent );
    ~BM2CMP_FRAME();

    // overload KIWAY_PLAYER virtual
    bool OpenProjectFiles( const std::vector<wxString>& aFilenames, int aCtl=0 ) override;

private:

    // Event handlers
    void OnPaintInit( wxPaintEvent& event ) override;
    void OnPaintGreyscale( wxPaintEvent& event ) override;
    void OnPaintBW( wxPaintEvent& event ) override;
    void OnLoadFile( wxCommandEvent& event ) override;
    void OnExport( wxCommandEvent& event ) override;

    /**
     * Generate a schematic library which contains one component:
     * the logo
     */
    void OnExportEeschema();

    /**
     * Generate a module in S expr format
     */
    void OnExportPcbnew();

    /**
     * Generate a postscript file
     */
    void OnExportPostScript();

    /**
     * Generate a file suitable to be copied into a page layout
     * description file (.kicad_wks file
     */
    void OnExportLogo();

    void Binarize( double aThreshold );     // aThreshold = 0.0 (black level) to 1.0 (white level)
    void OnNegativeClicked( wxCommandEvent& event ) override;
    void OnThresholdChange( wxScrollEvent& event ) override;
    void OnResolutionChange( wxCommandEvent& event ) override;

    // called when texts controls which handle the image resolution
    // lose the focus, to ensure the right values are displayed
    // because the m_imageDPI are clipped to acceptable values, and
    // the text displayed could be differ during text editing
    // We are using ChangeValue here to avoid generating a wxEVT_TEXT event.
    void UpdateDPITextValueX( wxMouseEvent& event )
    {
        m_DPIValueX->ChangeValue( wxString::Format( wxT( "%d" ), m_imageDPI.x ) );
    }

    void UpdateDPITextValueY( wxMouseEvent& event )
    {
        m_DPIValueY->ChangeValue( wxString::Format( wxT( "%d" ), m_imageDPI.y ) );
    }

    void NegateGreyscaleImage( );
    void ExportFile( FILE* aOutfile, OUTPUT_FMT_ID aFormat );
    void updateImageInfo();
    void OnFormatChange( wxCommandEvent& event ) override;
};


BM2CMP_FRAME::BM2CMP_FRAME( KIWAY* aKiway, wxWindow* aParent ) :
    BM2CMP_FRAME_BASE( aParent )
{
    SetKiway( this, aKiway );

    int tmp;
    m_config = GetNewConfig( Pgm().App().GetAppName() );
    m_config->Read( KEYWORD_FRAME_POSX, & m_framePos.x, -1 );
    m_config->Read( KEYWORD_FRAME_POSY, & m_framePos.y, -1 );
    m_config->Read( KEYWORD_FRAME_SIZEX, & m_frameSize.x, -1 );
    m_config->Read( KEYWORD_FRAME_SIZEY, & m_frameSize.y, -1 );
    m_config->Read( KEYWORD_LAST_INPUT_FILE, &m_BitmapFileName );
    m_config->Read( KEYWORD_LAST_OUTPUT_FILE, &m_ConvertedFileName );

    if( m_config->Read( KEYWORD_BINARY_THRESHOLD, &tmp ) )
        m_sliderThreshold->SetValue( tmp );

    m_config->Read( KEYWORD_BW_NEGATIVE, &tmp, 0 );
    m_Negative = tmp != 0;
    m_checkNegative->SetValue( m_Negative );

    if( m_config->Read( KEYWORD_LAST_FORMAT, &tmp ) )
    {
        if( tmp < 0 || tmp > FINAL_FMT )
            tmp = PCBNEW_KICAD_MOD;

        m_radioBoxFormat->SetSelection( tmp );
    }

    if( tmp == PCBNEW_KICAD_MOD )
        m_radio_PCBLayer->Enable( true );
    else
        m_radio_PCBLayer->Enable( false );

    if( m_config->Read( KEYWORD_LAST_MODLAYER, &tmp ) )
    {
        if( (unsigned) tmp > MOD_LYR_FINAL )    // Out of range
            m_radio_PCBLayer->SetSelection( MOD_LYR_FSILKS );
        else
            m_radio_PCBLayer->SetSelection( tmp );
    }

    // Give an icon
    wxIcon icon;
    icon.CopyFromBitmap( KiBitmap( icon_bitmap2component_xpm ) );
    SetIcon( icon );

    GetSizer()->SetSizeHints( this );

    SetSize( m_framePos.x, m_framePos.y, m_frameSize.x, m_frameSize.y );

    m_buttonExport->Enable( false );

    m_imageDPI.x = m_imageDPI.y = DEFAULT_DPI;  // Default resolution in Bit per inches

    if ( m_framePos == wxDefaultPosition )
        Centre();
}


BM2CMP_FRAME::~BM2CMP_FRAME()
{
    if( !m_config || IsIconized() )
        return;

    m_frameSize = GetSize();
    m_framePos  = GetPosition();

    m_config->Write( KEYWORD_FRAME_POSX, (long) m_framePos.x );
    m_config->Write( KEYWORD_FRAME_POSY, (long) m_framePos.y );
    m_config->Write( KEYWORD_FRAME_SIZEX, (long) m_frameSize.x );
    m_config->Write( KEYWORD_FRAME_SIZEY, (long) m_frameSize.y );
    m_config->Write( KEYWORD_LAST_INPUT_FILE, m_BitmapFileName );
    m_config->Write( KEYWORD_LAST_OUTPUT_FILE, m_ConvertedFileName );
    m_config->Write( KEYWORD_BINARY_THRESHOLD, m_sliderThreshold->GetValue() );
    m_config->Write( KEYWORD_BW_NEGATIVE, m_checkNegative->IsChecked() ? 1 : 0 );
    m_config->Write( KEYWORD_LAST_FORMAT,  m_radioBoxFormat->GetSelection() );
    m_config->Write( KEYWORD_LAST_MODLAYER,  m_radio_PCBLayer->GetSelection() );

    /* This needed for OSX: avoids further OnDraw processing after this
     * destructor and before the native window is destroyed
     */
    this->Freeze( );
}


void BM2CMP_FRAME::OnPaintInit( wxPaintEvent& event )
{
#ifdef __WXMAC__
    // Otherwise fails due: using wxPaintDC without being in a native paint event
    wxClientDC pict_dc( m_InitialPicturePanel );
#else
    wxPaintDC pict_dc( m_InitialPicturePanel );
#endif

    m_InitialPicturePanel->PrepareDC( pict_dc );

    // OSX crashes with empty bitmaps (on initial refreshes)
    if( m_Pict_Bitmap.IsOk() )
        pict_dc.DrawBitmap( m_Pict_Bitmap, 0, 0, !!m_Pict_Bitmap.GetMask() );

    event.Skip();
}


void BM2CMP_FRAME::OnPaintGreyscale( wxPaintEvent& event )
{
#ifdef __WXMAC__
    // Otherwise fails due: using wxPaintDC without being in a native paint event
    wxClientDC greyscale_dc( m_GreyscalePicturePanel );
#else
    wxPaintDC greyscale_dc( m_GreyscalePicturePanel );
#endif

    m_GreyscalePicturePanel->PrepareDC( greyscale_dc );

    // OSX crashes with empty bitmaps (on initial refreshes)
    if( m_Greyscale_Bitmap.IsOk() )
        greyscale_dc.DrawBitmap( m_Greyscale_Bitmap, 0, 0, !!m_Greyscale_Bitmap.GetMask() );

    event.Skip();
}


void BM2CMP_FRAME::OnPaintBW( wxPaintEvent& event )
{
#ifdef __WXMAC__
    // Otherwise fails due: using wxPaintDC without being in a native paint event
    wxClientDC nb_dc( m_BNPicturePanel );
#else
    wxPaintDC nb_dc( m_BNPicturePanel );
#endif

    m_BNPicturePanel->PrepareDC( nb_dc );

    if( m_BN_Bitmap.IsOk() )
        nb_dc.DrawBitmap( m_BN_Bitmap, 0, 0, !!m_BN_Bitmap.GetMask() );

    event.Skip();
}


void BM2CMP_FRAME::OnLoadFile( wxCommandEvent& event )
{
    wxFileName  fn( m_BitmapFileName );
    wxString    path = fn.GetPath();

    if( path.IsEmpty() || !wxDirExists( path ) )
        path = m_mruPath;

    wxFileDialog fileDlg( this, _( "Choose Image" ), path, wxEmptyString,
                          _( "Image Files " ) + wxImage::GetImageExtWildcard(),
                          wxFD_OPEN | wxFD_FILE_MUST_EXIST );

    int diag = fileDlg.ShowModal();

    if( diag != wxID_OK )
        return;

    wxString fullFilename = fileDlg.GetPath();

    if( !OpenProjectFiles( std::vector<wxString>( 1, fullFilename ) ) )
        return;

    fn = fullFilename;
    m_mruPath = fn.GetPath();
    SetStatusText( fullFilename );
    Refresh();
}


bool BM2CMP_FRAME::OpenProjectFiles( const std::vector<wxString>& aFileSet, int aCtl )
{
    m_Pict_Image.Destroy();
    m_BitmapFileName = aFileSet[0];

    if( !m_Pict_Image.LoadFile( m_BitmapFileName ) )
    {
        // LoadFile has its own UI, no need for further failure notification here
        return false;
    }

    m_Pict_Bitmap = wxBitmap( m_Pict_Image );

    int h  = m_Pict_Bitmap.GetHeight();
    int w  = m_Pict_Bitmap.GetWidth();

    // Determine image resolution in DPI (does not existing in all formats).
    // the resolution can be given in bit per inches or bit per cm in file
    m_imageDPI.x = m_Pict_Image.GetOptionInt( wxIMAGE_OPTION_RESOLUTIONX );
    m_imageDPI.y = m_Pict_Image.GetOptionInt( wxIMAGE_OPTION_RESOLUTIONY );

    if( m_imageDPI.x > 1 && m_imageDPI.y > 1 )
    {
        if( m_Pict_Image.GetOptionInt( wxIMAGE_OPTION_RESOLUTIONUNIT ) == wxIMAGE_RESOLUTION_CM )
        {
            // When the initial resolution is given in bits per cm,
            // experience shows adding 1.27 to the resolution converted in dpi
            // before convert to int value reduce the conversion error
            // but it is not perfect
            m_imageDPI.x = m_imageDPI.x * 2.54 + 1.27;
            m_imageDPI.y = m_imageDPI.y * 2.54 + 1.27;
        }
    }
    else    // fallback to the default value
        m_imageDPI.x = m_imageDPI.y = DEFAULT_DPI;

    // Display image info:
    // We are using ChangeValue here to avoid generating a wxEVT_TEXT event.
    m_DPIValueX->ChangeValue( wxString::Format( wxT( "%d" ), m_imageDPI.x ) );
    m_DPIValueY->ChangeValue( wxString::Format( wxT( "%d" ), m_imageDPI.y ) );
    updateImageInfo();

    m_InitialPicturePanel->SetVirtualSize( w, h );
    m_GreyscalePicturePanel->SetVirtualSize( w, h );
    m_BNPicturePanel->SetVirtualSize( w, h );

    m_Greyscale_Image.Destroy();
    m_Greyscale_Image = m_Pict_Image.ConvertToGreyscale( );

    if( m_Pict_Bitmap.GetMask() )
    {
        for( int x = 0; x < m_Pict_Bitmap.GetWidth(); x++ )
        {
            for( int y = 0; y < m_Pict_Bitmap.GetHeight(); y++ )
            {
                if( m_Pict_Image.GetRed( x, y ) == m_Pict_Image.GetMaskRed() &&
                    m_Pict_Image.GetGreen( x, y ) == m_Pict_Image.GetMaskGreen() &&
                    m_Pict_Image.GetBlue( x, y ) == m_Pict_Image.GetMaskBlue() )
                {
                    m_Greyscale_Image.SetRGB( x, y, 255, 255, 255 );
                }
            }
        }
    }

    if( m_Negative )
        NegateGreyscaleImage( );

    m_Greyscale_Bitmap = wxBitmap( m_Greyscale_Image );
    m_NB_Image  = m_Greyscale_Image;
    Binarize( (double) m_sliderThreshold->GetValue()/m_sliderThreshold->GetMax() );

    m_buttonExport->Enable( true );
    return true;
}


void BM2CMP_FRAME::updateImageInfo()
{
    // Note: the image resolution text controls are not modified
    // here, to avoid a race between text change when entered by user and
    // a text change if it is modified here.
    int h  = m_Pict_Bitmap.GetHeight();
    int w  = m_Pict_Bitmap.GetWidth();
    int nb = m_Pict_Bitmap.GetDepth();

    m_SizeXValue->SetLabel( wxString::Format( wxT( "%d" ), w ) );
    m_SizeYValue->SetLabel( wxString::Format( wxT( "%d" ), h ) );
    m_BPPValue->SetLabel( wxString::Format( wxT( "%d" ), nb ) );

    m_SizeXValue_mm->SetLabel( wxString::Format( wxT( "%.1f" ),
        (double) w / m_imageDPI.x * 25.4 ) );
    m_SizeYValue_mm->SetLabel( wxString::Format( wxT( "%.1f" ),
        (double) h / m_imageDPI.y * 25.4 ) );
}


void BM2CMP_FRAME::OnResolutionChange( wxCommandEvent& event )
{
    long tmp;

    if( m_DPIValueX->GetValue().ToLong( &tmp ) )
        m_imageDPI.x = tmp;

    if(  m_DPIValueY->GetValue().ToLong( &tmp ) )
        m_imageDPI.y = tmp;

    if( m_imageDPI.x < 32 )
        m_imageDPI.x = 32;

    if( m_imageDPI.y < 32 )
        m_imageDPI.y = 32;

    updateImageInfo();
}


void BM2CMP_FRAME::Binarize( double aThreshold )
{
    int           h = m_Greyscale_Image.GetHeight();
    int           w = m_Greyscale_Image.GetWidth();
    unsigned char threshold = aThreshold * 255;
    unsigned char alpha_thresh = 0.7 * threshold;

    for( int y = 0; y < h; y++ )
        for( int x = 0; x < w; x++ )
        {
            unsigned char pixout;
            auto pixin   = m_Greyscale_Image.GetGreen( x, y );
            auto alpha   = m_Greyscale_Image.HasAlpha() ?
                    m_Greyscale_Image.GetAlpha( x, y ) : wxALPHA_OPAQUE;

            if( pixin < threshold || alpha < alpha_thresh )
                pixout = 0;
            else
                pixout = 255;

            m_NB_Image.SetRGB( x, y, pixout, pixout, pixout );

        }

    m_BN_Bitmap = wxBitmap( m_NB_Image );

}


void BM2CMP_FRAME::NegateGreyscaleImage( )
{
    unsigned char  pix;
    int             h = m_Greyscale_Image.GetHeight();
    int             w = m_Greyscale_Image.GetWidth();

    for( int y = 0; y < h; y++ )
        for( int x = 0; x < w; x++ )
        {
            pix   = m_Greyscale_Image.GetGreen( x, y );
            pix = ~pix;
            m_Greyscale_Image.SetRGB( x, y, pix, pix, pix );
        }
}


void BM2CMP_FRAME::OnNegativeClicked( wxCommandEvent&  )
{
    if( m_checkNegative->GetValue() != m_Negative )
    {
        NegateGreyscaleImage();

        m_Greyscale_Bitmap = wxBitmap( m_Greyscale_Image );
        Binarize( (double)m_sliderThreshold->GetValue()/m_sliderThreshold->GetMax() );
        m_Negative = m_checkNegative->GetValue();

        Refresh();
    }
}


void BM2CMP_FRAME::OnThresholdChange( wxScrollEvent& event )
{
    Binarize( (double)m_sliderThreshold->GetValue()/m_sliderThreshold->GetMax() );
    Refresh();
}


void BM2CMP_FRAME::OnExport( wxCommandEvent& event )
{
    // choices of m_radioBoxFormat are expected to be in same order as
    // OUTPUT_FMT_ID. See bitmap2component.h
    OUTPUT_FMT_ID sel = (OUTPUT_FMT_ID) m_radioBoxFormat->GetSelection();

    switch( sel )
    {
    case EESCHEMA_FMT:
        OnExportEeschema();
        break;

    case PCBNEW_KICAD_MOD:
        OnExportPcbnew();
        break;

    case POSTSCRIPT_FMT:
        OnExportPostScript();
        break;

    case KICAD_LOGO:
        OnExportLogo();
        break;
    }
}


void BM2CMP_FRAME::OnExportLogo()
{
    wxFileName  fn( m_ConvertedFileName );
    wxString    path = fn.GetPath();

    if( path.IsEmpty() || !wxDirExists(path) )
        path = ::wxGetCwd();

    wxFileDialog fileDlg( this, _( "Create Logo File" ), path, wxEmptyString,
                          PageLayoutDescrFileWildcard(),
                          wxFD_SAVE | wxFD_OVERWRITE_PROMPT );
    int          diag = fileDlg.ShowModal();

    if( diag != wxID_OK )
        return;

    fn = fileDlg.GetPath();
    fn.SetExt( PageLayoutDescrFileExtension );
    m_ConvertedFileName = fn.GetFullPath();

    FILE*    outfile;
    outfile = wxFopen( m_ConvertedFileName, wxT( "w" ) );

    if( outfile == NULL )
    {
        wxString msg;
        msg.Printf( _( "File \"%s\" could not be created." ), GetChars( m_ConvertedFileName ) );
        wxMessageBox( msg );
        return;
    }

    ExportFile( outfile, KICAD_LOGO );
    fclose( outfile );
}


void BM2CMP_FRAME::OnExportPostScript()
{
    wxFileName  fn( m_ConvertedFileName );
    wxString    path = fn.GetPath();

    if( path.IsEmpty() || !wxDirExists( path ) )
        path = ::wxGetCwd();

    wxFileDialog fileDlg( this, _( "Create Postscript File" ),
                          path, wxEmptyString,
                          PSFileWildcard(),
                          wxFD_SAVE | wxFD_OVERWRITE_PROMPT );

    int          diag = fileDlg.ShowModal();

    if( diag != wxID_OK )
        return;

    fn = fileDlg.GetPath();
    fn.SetExt( wxT( "ps" ) );
    m_ConvertedFileName = fn.GetFullPath();

    FILE*    outfile;
    outfile = wxFopen( m_ConvertedFileName, wxT( "w" ) );

    if( outfile == NULL )
    {
        wxString msg;
        msg.Printf( _( "File \"%s\" could not be created." ), GetChars( m_ConvertedFileName ) );
        wxMessageBox( msg );
        return;
    }

    ExportFile( outfile, POSTSCRIPT_FMT );
    fclose( outfile );
}


void BM2CMP_FRAME::OnExportEeschema()
{
    wxFileName  fn( m_ConvertedFileName );
    wxString    path = fn.GetPath();

    if( path.IsEmpty() || !wxDirExists(path) )
        path = ::wxGetCwd();

    wxFileDialog fileDlg( this, _( "Create Symbol Library" ),
                          path, wxEmptyString,
                          SchematicLibraryFileWildcard(),
                          wxFD_SAVE | wxFD_OVERWRITE_PROMPT );

    int          diag = fileDlg.ShowModal();

    if( diag != wxID_OK )
        return;

    fn = fileDlg.GetPath();
    fn.SetExt( SchematicLibraryFileExtension );
    m_ConvertedFileName = fn.GetFullPath();

    FILE*    outfile = wxFopen( m_ConvertedFileName, wxT( "w" ) );

    if( outfile == NULL )
    {
        wxString msg;
        msg.Printf( _( "File \"%s\" could not be created." ), GetChars( m_ConvertedFileName ) );
        wxMessageBox( msg );
        return;
    }

    ExportFile( outfile, EESCHEMA_FMT );
    fclose( outfile );
}


void BM2CMP_FRAME::OnExportPcbnew()
{
    wxFileName  fn( m_ConvertedFileName );
    wxString    path = fn.GetPath();

    if( path.IsEmpty() || !wxDirExists( path ) )
        path = m_mruPath;

    wxFileDialog fileDlg( this, _( "Create Footprint Library" ),
                          path, wxEmptyString,
                          KiCadFootprintLibFileWildcard(),
                          wxFD_SAVE | wxFD_OVERWRITE_PROMPT );

    int          diag = fileDlg.ShowModal();

    if( diag != wxID_OK )
        return;

    fn = fileDlg.GetPath();
    fn.SetExt( KiCadFootprintFileExtension );
    m_ConvertedFileName = fn.GetFullPath();

    FILE* outfile = wxFopen( m_ConvertedFileName, wxT( "w" ) );

    if( outfile == NULL )
    {
        wxString msg;
        msg.Printf( _( "File \"%s\" could not be created." ), GetChars( m_ConvertedFileName ) );
        wxMessageBox( msg );
        return;
    }

    ExportFile( outfile, PCBNEW_KICAD_MOD );
    fclose( outfile );
    m_mruPath = fn.GetPath();
}


void BM2CMP_FRAME::ExportFile( FILE* aOutfile, OUTPUT_FMT_ID aFormat )
{
    // Create a potrace bitmap
    int h = m_NB_Image.GetHeight();
    int w = m_NB_Image.GetWidth();
    potrace_bitmap_t* potrace_bitmap = bm_new( w, h );

    if( !potrace_bitmap )
    {
        wxString msg;
        msg.Printf( _( "Error allocating memory for potrace bitmap" ) );
        wxMessageBox( msg );
        return;
    }

    /* fill the bitmap with data */
    for( int y = 0; y < h; y++ )
    {
        for( int x = 0; x < w; x++ )
        {
            auto pix = m_NB_Image.GetGreen( x, y );
            BM_PUT( potrace_bitmap, x, y, pix ? 0 : 1 );
        }
    }

    // choices of m_radio_PCBLayer are expected to be in same order as
    // BMP2CMP_MOD_LAYER. See bitmap2component.h
    BMP2CMP_MOD_LAYER modLayer = MOD_LYR_FSILKS;

    if( aFormat == PCBNEW_KICAD_MOD )
        modLayer = (BMP2CMP_MOD_LAYER) m_radio_PCBLayer->GetSelection();

    bitmap2component( potrace_bitmap, aOutfile, aFormat, m_imageDPI.x, m_imageDPI.y, modLayer );
}



//-----<KIFACE>-----------------------------------------------------------------

namespace BMP2CMP {

static struct IFACE : public KIFACE_I
{
    bool OnKifaceStart( PGM_BASE* aProgram, int aCtlBits ) override;

    wxWindow* CreateWindow( wxWindow* aParent, int aClassId, KIWAY* aKiway, int aCtlBits = 0 ) override
    {
        return new BM2CMP_FRAME( aKiway, aParent );
    }

    /**
     * Function IfaceOrAddress
     * return a pointer to the requested object.  The safest way to use this
     * is to retrieve a pointer to a static instance of an interface, similar to
     * how the KIFACE interface is exported.  But if you know what you are doing
     * use it to retrieve anything you want.
     *
     * @param aDataId identifies which object you want the address of.
     *
     * @return void* - and must be cast into the know type.
     */
    void* IfaceOrAddress( int aDataId ) override
    {
        return NULL;
    }

    IFACE( const char* aDSOname, KIWAY::FACE_T aType ) :
        KIFACE_I( aDSOname, aType )
    {}

} kiface( "BMP2CMP", KIWAY::FACE_BMP2CMP );

}   // namespace BMP2CMP

using namespace BMP2CMP;

static PGM_BASE* process;

KIFACE_I& Kiface()
{
    return kiface;
}


// KIFACE_GETTER's actual spelling is a substitution macro found in kiway.h.
// KIFACE_GETTER will not have name mangling due to declaration in kiway.h.
KIFACE* KIFACE_GETTER( int* aKIFACEversion, int aKIWAYversion, PGM_BASE* aProgram )
{
    process = (PGM_BASE*) aProgram;
    return &kiface;
}


#if defined(BUILD_KIWAY_DLLS)
PGM_BASE& Pgm()
{
    wxASSERT( process );    // KIFACE_GETTER has already been called.
    return *process;
}
#endif


bool IFACE::OnKifaceStart( PGM_BASE* aProgram, int aCtlBits )
{
    return start_common( aCtlBits );
}

void BM2CMP_FRAME::OnFormatChange( wxCommandEvent& event )
{
    if( m_radioBoxFormat->GetSelection() == PCBNEW_KICAD_MOD )
        m_radio_PCBLayer->Enable( true );
    else
        m_radio_PCBLayer->Enable( false );

    event.Skip();
}