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/*************************************************************************
** ShadingPatch.h **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2015 Martin Gieseking <martin.gieseking@uos.de> **
** **
** 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 3 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 <http://www.gnu.org/licenses/>. **
*************************************************************************/
#ifndef DVISVGM_SHADINGPATCH_H
#define DVISVGM_SHADINGPATCH_H
#include "Color.h"
#include "GraphicPath.h"
#include "MessageException.h"
class ShadingPatch
{
public:
struct Callback {
virtual ~Callback () {}
virtual void patchSegment (GraphicPath<double> &path, const Color &color) =0;
};
typedef std::vector<DPair> PointVec;
typedef std::vector<Color> ColorVec;
public:
ShadingPatch (Color::ColorSpace colorSpace) : _colorspace(colorSpace) {}
virtual ~ShadingPatch () {}
virtual int psShadingType () const =0;
virtual void approximate (int gridsize, bool overlap, double delta, Callback &callback) const =0;
virtual void getBBox (BoundingBox &bbox) const =0;
virtual void getBoundaryPath (GraphicPath<double> &path) const =0;
virtual void setPoints (const PointVec &points, int edgeflag, ShadingPatch *patch) =0;
virtual void setColors (const ColorVec &colors, int edgeflag, ShadingPatch *patch) =0;
virtual int numPoints (int edgeflag) const =0;
virtual int numColors (int edgeflag) const =0;
virtual Color averageColor() const =0;
Color::ColorSpace colorSpace () const {return _colorspace;}
static ShadingPatch* create (int psShadingType, Color::ColorSpace cspace);
protected:
typedef void (Color::*ColorGetter)(std::valarray<double> &va) const;
typedef void (Color::*ColorSetter)(const std::valarray<double> &va);
void colorQueryFuncs (ColorGetter &getter, ColorSetter &setter) const;
private:
Color::ColorSpace _colorspace; ///< color space used to compute the shading values
};
struct ShadingException : public MessageException
{
ShadingException (const std::string &msg) : MessageException(msg) {}
};
#endif
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