outline_decomposer.h

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/*
 * This program source code file is part of KICAD, a free EDA CAD application.
 *
 * Copyright (C) 2021 Ola Rinta-Koski
 * Copyright (C) 2021 Kicad Developers, see AUTHORS.txt for contributors.
 *
 * Outline font class
 *
 * 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
 */
 
#ifndef OUTLINE_DECOMPOSER_H
#define OUTLINE_DECOMPOSER_H
 
#include <vector>
#ifdef _MSC_VER
#include <ft2build.h>
#else
#include <freetype2/ft2build.h>
#endif
#include FT_FREETYPE_H
#include FT_OUTLINE_H
#include <math/box2.h>
#include <math/vector2d.h>
#include <font/glyph.h>
 
namespace KIFONT
{
typedef std::vector<VECTOR2D> GLYPH_POINTS;
typedef std::vector<GLYPH_POINTS> GLYPH_POINTS_LIST;
typedef std::vector<BOX2D> GLYPH_BOUNDING_BOX_LIST;
 
struct CONTOUR
{
 GLYPH_POINTS m_Points;
 int m_Winding = 0;
 FT_Orientation m_Orientation;
};
 
 
typedef std::vector<CONTOUR> CONTOURS;
 
 
class OUTLINE_DECOMPOSER
{
public:
 OUTLINE_DECOMPOSER( FT_Outline& aOutline );
 
 void OutlineToSegments( CONTOURS* aContours );
 
private:
 void contourToSegmentsAndArcs( CONTOUR& aResult, unsigned int aContourIndex ) const;
 
 void newContour();
 
 void addContourPoint( const VECTOR2D& p );
 
 int approximateContour( const GLYPH_POINTS& aPoints, const std::vector<bool>& aPointOnCurve,
 GLYPH_POINTS& aResult ) const;
 
 bool approximateBezierCurve( GLYPH_POINTS& result, const GLYPH_POINTS& bezier ) const;
 bool approximateQuadraticBezierCurve( GLYPH_POINTS& result, const GLYPH_POINTS& bezier ) const;
 bool approximateCubicBezierCurve( GLYPH_POINTS& result, const GLYPH_POINTS& bezier ) const;
 
 int winding( const GLYPH_POINTS& aContour ) const;
 
 inline static unsigned int onCurve( char aTags )
 {
 return aTags & 0x1;
 }
 
 inline static unsigned int thirdOrderBezierPoint( char aTags )
 {
 return onCurve( aTags ) ? 0 : aTags & 0x2;
 }
 
 inline static unsigned int secondOrderBezierPoint( char aTags )
 {
 return onCurve( aTags ) ? 0 : !thirdOrderBezierPoint( aTags );
 }
 
 inline static unsigned int hasDropout( char aTags )
 {
 return aTags & 0x4;
 }
 
 inline static unsigned int dropoutMode( char aTags )
 {
 return hasDropout( aTags ) ? ( aTags & 0x38 ) : 0;
 }
 
 // FT_Outline_Decompose callbacks
 static int moveTo( const FT_Vector* aEndPoint, void* aCallbackData );
 
 static int lineTo( const FT_Vector* aEndPoint, void* aCallbackData );
 
 static int quadraticTo( const FT_Vector* aControlPoint, const FT_Vector* aEndPoint,
 void* aCallbackData );
 
 static int cubicTo( const FT_Vector* aFirstControlPoint, const FT_Vector* aSecondControlPoint,
 const FT_Vector* aEndPoint, void* aCallbackData );
 
private:
 FT_Outline& m_outline;
 CONTOURS* m_contours;
 
 VECTOR2D m_lastEndPoint;
};
 
} //namespace KIFONT
 
#endif // OUTLINE_DECOMPOSER_H