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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /dviware/dvisvgm/src/ShadingPatch.hpp
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+/*************************************************************************
+** ShadingPatch.hpp **
+** **
+** This file is part of dvisvgm -- a fast DVI to SVG converter **
+** Copyright (C) 2005-2019 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 void getBBox (BoundingBox &bbox) const =0;
+ virtual void getBoundaryPath (GraphicsPath<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 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
+