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-/*************************************************************************
-** ShadingPatch.hpp **
-** **
-** This file is part of dvisvgm -- a fast DVI to SVG converter **
-** Copyright (C) 2005-2021 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 SHADINGPATCH_HPP
-#define SHADINGPATCH_HPP
-
-#include <memory>
-#include "Color.hpp"
-#include "GraphicsPath.hpp"
-#include "MessageException.hpp"
-
-
-class ShadingPatch {
- public:
- struct Callback {
- virtual ~Callback () =default;
- virtual void patchSegment (GraphicsPath<double> &path, const Color &color) =0;
- };
-
- using PointVec = std::vector<DPair>;
- using ColorVec = std::vector<Color>;
-
- public:
- explicit ShadingPatch (Color::ColorSpace colorSpace) : _colorspace(colorSpace) {}
- virtual ~ShadingPatch () =default;
- virtual int psShadingType () const =0;
- virtual void approximate (int gridsize, bool overlap, double delta, Callback &callback) const =0;
- virtual BoundingBox getBBox () const =0;
- virtual GraphicsPath<double> getBoundaryPath () 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 std::unique_ptr<ShadingPatch> create (int psShadingType, Color::ColorSpace cspace);
-
- protected:
- using ColorGetter = void (Color::*)(std::valarray<double> &va) const;
- using ColorSetter = void (Color::*)(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 {
- explicit ShadingException (const std::string &msg) : MessageException(msg) {}
-};
-
-#endif
-