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kicad/bitmap2component/bitmap2component.cpp

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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 1992-2013 jean-pierre.charras
* Copyright (C) 1992-2013 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 <cmath>
#include <algorithm> // std::max
// For some unknown reasons, polygon.hpp should be included first
#include <boost/polygon/polygon.hpp>
#include <wx/wx.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <cmath>
#include <vector>
#include <layers_id_colors_and_visibility.h>
#include <potracelib.h>
#include <auxiliary.h>
#include <bitmap2component.h>
// Define some types used here from boost::polygon
namespace bpl = boost::polygon; // bpl = boost polygon library
using namespace bpl::operators; // +, -, =, ...
typedef int coordinate_type;
typedef bpl::polygon_data<coordinate_type> KPolygon; // define a basic polygon
typedef std::vector<KPolygon> KPolygonSet; // define a set of polygons
typedef bpl::point_data<coordinate_type> KPolyPoint; // define a corner of a polygon
/* free a potrace bitmap */
static void bm_free( potrace_bitmap_t* bm )
{
if( bm != NULL )
{
free( bm->map );
}
free( bm );
}
/* Helper class to handle useful info to convert a bitmap image to
* a polygonal object description
*/
class BITMAPCONV_INFO
{
public:
enum OUTPUT_FMT_ID m_Format; // File format
int m_PixmapWidth;
int m_PixmapHeight; // the bitmap size in pixels
double m_ScaleX;
double m_ScaleY; // the conversion scale
potrace_path_t* m_Paths; // the list of paths, from potrace (list of lines and bezier curves)
FILE* m_Outfile; // File to create
const char * m_CmpName; // The string used as cmp/footprint name
public:
BITMAPCONV_INFO();
/**
* Function CreateOutputFile
* Creates the output file specified by m_Outfile,
* depending on file format given by m_Format
*/
void CreateOutputFile( BMP2CMP_MOD_LAYER aModLayer = (BMP2CMP_MOD_LAYER) 0 );
private:
/**
* Function OuputFileHeader
* write to file the header depending on file format
*/
void OuputFileHeader( const char * aBrdLayerName );
/**
* Function OuputFileEnd
* write to file the last strings depending on file format
*/
void OuputFileEnd();
/**
* @return the board layer name depending on the board layer selected
* @param aChoice = the choice (MOD_LYR_FSILKS to MOD_LYR_FINAL)
*/
const char * getBrdLayerName( BMP2CMP_MOD_LAYER aChoice );
/**
* Function OuputOnePolygon
* write one polygon to output file.
* Polygon coordinates are expected scaled by the polugon extraction function
*/
void OuputOnePolygon( KPolygon & aPolygon, const char * aBrdLayerName );
};
static void BezierToPolyline( std::vector <potrace_dpoint_t>& aCornersBuffer,
potrace_dpoint_t p1,
potrace_dpoint_t p2,
potrace_dpoint_t p3,
potrace_dpoint_t p4 );
BITMAPCONV_INFO::BITMAPCONV_INFO()
{
m_Format = POSTSCRIPT_FMT;
m_PixmapWidth = 0;
m_PixmapHeight = 0;
m_ScaleX = 1.0;
m_ScaleY = 1.0;
m_Paths = NULL;
m_Outfile = NULL;
m_CmpName = "LOGO";
}
int bitmap2component( potrace_bitmap_t* aPotrace_bitmap, FILE* aOutfile,
OUTPUT_FMT_ID aFormat, int aDpi_X, int aDpi_Y,
BMP2CMP_MOD_LAYER aModLayer )
{
potrace_param_t* param;
potrace_state_t* st;
// set tracing parameters, starting from defaults
param = potrace_param_default();
if( !param )
{
fprintf( stderr, "Error allocating parameters: %s\n", strerror( errno ) );
return 1;
}
param->turdsize = 0;
/* convert the bitmap to curves */
st = potrace_trace( param, aPotrace_bitmap );
if( !st || st->status != POTRACE_STATUS_OK )
{
if( st )
{
potrace_state_free( st );
}
potrace_param_free( param );
fprintf( stderr, "Error tracing bitmap: %s\n", strerror( errno ) );
return 1;
}
BITMAPCONV_INFO info;
info.m_PixmapWidth = aPotrace_bitmap->w;
info.m_PixmapHeight = aPotrace_bitmap->h; // the bitmap size in pixels
info.m_Paths = st->plist;
info.m_Outfile = aOutfile;
switch( aFormat )
{
case KICAD_LOGO:
info.m_Format = KICAD_LOGO;
info.m_ScaleX = 1e3 * 25.4 / aDpi_X; // the conversion scale from PPI to micro
info.m_ScaleY = 1e3 * 25.4 / aDpi_Y; // Y axis is top to bottom
info.CreateOutputFile();
break;
case POSTSCRIPT_FMT:
info.m_Format = POSTSCRIPT_FMT;
info.m_ScaleX = 1.0; // the conversion scale
info.m_ScaleY = info.m_ScaleX;
// output vector data, e.g. as a rudimentary EPS file (mainly for tests)
info.CreateOutputFile();
break;
case EESCHEMA_FMT:
info.m_Format = EESCHEMA_FMT;
info.m_ScaleX = 1000.0 / aDpi_X; // the conversion scale from PPI to UI
info.m_ScaleY = -1000.0 / aDpi_Y; // Y axis is bottom to Top for components in libs
info.CreateOutputFile();
break;
case PCBNEW_KICAD_MOD:
info.m_Format = PCBNEW_KICAD_MOD;
info.m_ScaleX = 1e6 * 25.4 / aDpi_X; // the conversion scale from PPI to UI
info.m_ScaleY = 1e6 * 25.4 / aDpi_Y; // Y axis is top to bottom in modedit
info.CreateOutputFile( aModLayer );
break;
default:
break;
}
bm_free( aPotrace_bitmap );
potrace_state_free( st );
potrace_param_free( param );
return 0;
}
const char* BITMAPCONV_INFO::getBrdLayerName( BMP2CMP_MOD_LAYER aChoice )
{
const char * layerName = "F.SilkS";
switch( aChoice )
{
case MOD_LYR_FSOLDERMASK:
layerName = "F.Mask";
break;
case MOD_LYR_ECO1:
layerName = "Eco1.User";
break;
case MOD_LYR_ECO2:
layerName = "Eco2.User";
break;
case MOD_LYR_FSILKS:
default: // case MOD_LYR_FSILKS only unless there is a bug
break;
}
return layerName;
}
void BITMAPCONV_INFO::OuputFileHeader( const char * aBrdLayerName )
{
int Ypos = (int) ( m_PixmapHeight / 2 * m_ScaleY );
int fieldSize; // fields text size = 60 mils
switch( m_Format )
{
case POSTSCRIPT_FMT:
/* output vector data, e.g. as a rudimentary EPS file */
fprintf( m_Outfile, "%%!PS-Adobe-3.0 EPSF-3.0\n" );
fprintf( m_Outfile, "%%%%BoundingBox: 0 0 %d %d\n",
m_PixmapWidth, m_PixmapHeight );
fprintf( m_Outfile, "gsave\n" );
break;
case PCBNEW_KICAD_MOD:
// fields text size = 1.5 mm
// fields text thickness = 1.5 / 5 = 0.3mm
fprintf( m_Outfile, "(module %s (layer F.Cu)\n (at 0 0)\n",
m_CmpName );
fprintf( m_Outfile, " (fp_text reference \"G***\" (at 0 0) (layer %s) hide\n"
" (effects (font (thickness 0.3)))\n )\n", aBrdLayerName );
fprintf( m_Outfile, " (fp_text value \"%s\" (at 0.75 0) (layer %s) hide\n"
" (effects (font (thickness 0.3)))\n )\n", m_CmpName, aBrdLayerName );
break;
case KICAD_LOGO:
fprintf( m_Outfile, "(polygon (pos 0 0 rbcorner) (rotate 0) (linewidth 0.01)\n" );
break;
case EESCHEMA_FMT:
fprintf( m_Outfile, "EESchema-LIBRARY Version 2.3\n" );
fprintf( m_Outfile, "#\n# %s\n", m_CmpName );
fprintf( m_Outfile, "# pixmap size w = %d, h = %d\n#\n",
m_PixmapWidth, m_PixmapHeight );
// print reference and value
fieldSize = 60; // fields text size = 60 mils
Ypos += fieldSize / 2;
fprintf( m_Outfile, "DEF %s G 0 40 Y Y 1 F N\n", m_CmpName );
fprintf( m_Outfile, "F0 \"#G\" 0 %d %d H I C CNN\n", Ypos, fieldSize );
fprintf( m_Outfile, "F1 \"%s\" 0 %d %d H I C CNN\n", m_CmpName, -Ypos, fieldSize );
fprintf( m_Outfile, "DRAW\n" );
break;
}
}
void BITMAPCONV_INFO::OuputFileEnd()
{
switch( m_Format )
{
case POSTSCRIPT_FMT:
fprintf( m_Outfile, "grestore\n" );
fprintf( m_Outfile, "%%EOF\n" );
break;
case PCBNEW_KICAD_MOD:
fprintf( m_Outfile, ")\n" );
break;
case KICAD_LOGO:
fprintf( m_Outfile, ")\n" );
break;
case EESCHEMA_FMT:
fprintf( m_Outfile, "ENDDRAW\n" );
fprintf( m_Outfile, "ENDDEF\n" );
break;
}
}
/**
* Function OuputOnePolygon
* write one polygon to output file.
* Polygon coordinates are expected scaled by the polygon extraction function
*/
void BITMAPCONV_INFO::OuputOnePolygon( KPolygon & aPolygon, const char * aBrdLayerName )
{
unsigned ii, jj;
KPolyPoint currpoint;
int offsetX = (int)( m_PixmapWidth / 2 * m_ScaleX );
int offsetY = (int)( m_PixmapHeight / 2 * m_ScaleY );
KPolyPoint startpoint = *aPolygon.begin();
switch( m_Format )
{
case POSTSCRIPT_FMT:
offsetY = (int)( m_PixmapHeight * m_ScaleY );
fprintf( m_Outfile, "newpath\n%d %d moveto\n",
startpoint.x(), offsetY - startpoint.y() );
jj = 0;
for( ii = 1; ii < aPolygon.size(); ii++ )
{
currpoint = *(aPolygon.begin() + ii);
fprintf( m_Outfile, " %d %d lineto",
currpoint.x(), offsetY - currpoint.y() );
if( jj++ > 6 )
{
jj = 0;
fprintf( m_Outfile, ("\n") );
}
}
fprintf( m_Outfile, "\nclosepath fill\n" );
break;
case PCBNEW_KICAD_MOD:
{
double width = 0.1;
fprintf( m_Outfile, " (fp_poly (pts" );
jj = 0;
for( ii = 0; ii < aPolygon.size(); ii++ )
{
currpoint = *( aPolygon.begin() + ii );
fprintf( m_Outfile, " (xy %f %f)",
(currpoint.x() - offsetX) / 1e6,
(currpoint.y() - offsetY) / 1e6 );
if( jj++ > 6 )
{
jj = 0;
fprintf( m_Outfile, ("\n ") );
}
}
// Close polygon
fprintf( m_Outfile, " (xy %f %f) )",
(startpoint.x() - offsetX) / 1e6, (startpoint.y() - offsetY) / 1e6 );
fprintf( m_Outfile, "(layer %s) (width %f)\n )\n", aBrdLayerName, width );
}
break;
case KICAD_LOGO:
fprintf( m_Outfile, " (pts" );
// Internal units = micron, file unit = mm
jj = 0;
for( ii = 0; ii < aPolygon.size(); ii++ )
{
currpoint = *( aPolygon.begin() + ii );
fprintf( m_Outfile, " (xy %.3f %.3f)",
(currpoint.x() - offsetX) / 1e3,
(currpoint.y() - offsetY) / 1e3 );
if( jj++ > 4 )
{
jj = 0;
fprintf( m_Outfile, ("\n ") );
}
}
// Close polygon
fprintf( m_Outfile, " (xy %.3f %.3f) )\n",
(startpoint.x() - offsetX) / 1e3, (startpoint.y() - offsetY) / 1e3 );
break;
case EESCHEMA_FMT:
fprintf( m_Outfile, "P %d 0 0 1", (int) aPolygon.size() + 1 );
for( ii = 0; ii < aPolygon.size(); ii++ )
{
currpoint = *(aPolygon.begin() + ii);
fprintf( m_Outfile, " %d %d",
currpoint.x() - offsetX, currpoint.y() - offsetY );
}
// Close polygon
fprintf( m_Outfile, " %d %d",
startpoint.x() - offsetX, startpoint.y() - offsetY );
fprintf( m_Outfile, " F\n" );
break;
}
}
void BITMAPCONV_INFO::CreateOutputFile( BMP2CMP_MOD_LAYER aModLayer )
{
KPolyPoint currpoint;
std::vector <potrace_dpoint_t> cornersBuffer;
// This KPolygonSet polyset_areas is a complex polygon to draw
// and can be complex depending on holes inside this polygon
KPolygonSet polyset_areas;
// This KPolygonSet polyset_holes is the set of holes inside polyset_areas
KPolygonSet polyset_holes;
potrace_dpoint_t( *c )[3];
setlocale( LC_NUMERIC, "C" ); // Switch the locale to standard C
// The layer name has meaning only for .kicad_mod files.
// For these files the header creates 2 invisible texts: value and ref
// (needed but not usefull) on silk screen layer
OuputFileHeader( getBrdLayerName( MOD_LYR_FSILKS ) );
bool main_outline = true;
/* draw each as a polygon with no hole.
* Bezier curves are approximated by a polyline
*/
potrace_path_t* paths = m_Paths; // the list of paths
while( paths != NULL )
{
int cnt = paths->curve.n;
int* tag = paths->curve.tag;
c = paths->curve.c;
potrace_dpoint_t startpoint = c[cnt - 1][2];
for( int i = 0; i < cnt; i++ )
{
switch( tag[i] )
{
case POTRACE_CORNER:
cornersBuffer.push_back( c[i][1] );
cornersBuffer.push_back( c[i][2] );
startpoint = c[i][2];
break;
case POTRACE_CURVETO:
BezierToPolyline( cornersBuffer, startpoint, c[i][0], c[i][1], c[i][2] );
startpoint = c[i][2];
break;
}
}
// Store current path
if( main_outline )
{
main_outline = false;
// build the current main polygon
std::vector<KPolyPoint> cornerslist; // a simple boost polygon
for( unsigned int i = 0; i < cornersBuffer.size(); i++ )
{
currpoint.x( (coordinate_type) (cornersBuffer[i].x * m_ScaleX) );
currpoint.y( (coordinate_type) (cornersBuffer[i].y * m_ScaleY) );
cornerslist.push_back( currpoint );
}
KPolygon poly;
bpl::set_points( poly, cornerslist.begin(), cornerslist.end() );
polyset_areas.push_back( poly );
}
else
{
// Add current hole in polyset_holes
std::vector<KPolyPoint> cornerslist; // a simple boost polygon
for( unsigned int i = 0; i < cornersBuffer.size(); i++ )
{
currpoint.x( (coordinate_type) (cornersBuffer[i].x * m_ScaleX) );
currpoint.y( (coordinate_type) (cornersBuffer[i].y * m_ScaleY) );
cornerslist.push_back( currpoint );
}
KPolygon poly;
bpl::set_points( poly, cornerslist.begin(), cornerslist.end() );
polyset_holes.push_back( poly );
}
cornersBuffer.clear();
/* at the end of a group of a positive path and its negative children, fill.
*/
if( paths->next == NULL || paths->next->sign == '+' )
{
// Substract holes to main polygon:
polyset_areas -= polyset_holes;
// Output current resulting polygon(s)
for( unsigned ii = 0; ii < polyset_areas.size(); ii++ )
{
KPolygon& poly = polyset_areas[ii];
OuputOnePolygon(poly, getBrdLayerName( aModLayer ) );
}
polyset_areas.clear();
polyset_holes.clear();
main_outline = true;
}
paths = paths->next;
}
OuputFileEnd();
setlocale( LC_NUMERIC, "" ); // revert to the current locale
}
/* render a Bezier curve. */
void BezierToPolyline( std::vector <potrace_dpoint_t>& aCornersBuffer,
potrace_dpoint_t p1,
potrace_dpoint_t p2,
potrace_dpoint_t p3,
potrace_dpoint_t p4 )
{
double dd0, dd1, dd, delta, e2, epsilon, t;
// p1 = starting point
/* we approximate the curve by small line segments. The interval
* size, epsilon, is determined on the fly so that the distance
* between the true curve and its approximation does not exceed the
* desired accuracy delta. */
delta = 0.25; /* desired accuracy, in pixels */
/* let dd = maximal value of 2nd derivative over curve - this must
* occur at an endpoint. */
dd0 = sq( p1.x - 2 * p2.x + p3.x ) + sq( p1.y - 2 * p2.y + p3.y );
dd1 = sq( p2.x - 2 * p3.x + p4.x ) + sq( p2.y - 2 * p3.y + p4.y );
dd = 6 * sqrt( max( dd0, dd1 ) );
e2 = 8 * delta <= dd ? 8 * delta / dd : 1;
epsilon = sqrt( e2 ); /* necessary interval size */
for( t = epsilon; t<1; t += epsilon )
{
potrace_dpoint_t intermediate_point;
intermediate_point.x = p1.x * cu( 1 - t ) +
3* p2.x* sq( 1 - t ) * t +
3 * p3.x * (1 - t) * sq( t ) +
p4.x* cu( t );
intermediate_point.y = p1.y * cu( 1 - t ) +
3* p2.y* sq( 1 - t ) * t +
3 * p3.y * (1 - t) * sq( t ) + p4.y* cu( t );
aCornersBuffer.push_back( intermediate_point );
}
aCornersBuffer.push_back( p4 );
}
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