kicad/include/font/outline_decomposer.h

133 lines
3.9 KiB
C++

/*
* 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;
/**
* @return 1 if aContour is in clockwise order, -1 if it is in
* counterclockwise order, or 0 if the winding can't be
* determined.
*/
int winding( const GLYPH_POINTS& aContour ) const;
inline static const unsigned int onCurve( char aTags )
{
return aTags & 0x1;
}
inline static const unsigned int thirdOrderBezierPoint( char aTags )
{
return onCurve( aTags ) ? 0 : aTags & 0x2;
}
inline static const unsigned int secondOrderBezierPoint( char aTags )
{
return onCurve( aTags ) ? 0 : !thirdOrderBezierPoint( aTags );
}
inline static const unsigned int hasDropout( char aTags )
{
return aTags & 0x4;
}
inline static const 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