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diff --git a/Build/source/texk/dvisvgm/dvisvgm-src/src/Opacity.hpp b/Build/source/texk/dvisvgm/dvisvgm-src/src/Opacity.hpp
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+/*************************************************************************
+** Opacity.hpp                                                          **
+**                                                                      **
+** This file is part of dvisvgm -- a fast DVI to SVG converter          **
+** Copyright (C) 2005-2022 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 OPACITY_HPP
+#define OPACITY_HPP
+
+#include <string>
+
+class OpacityAlpha {
+	public:
+		OpacityAlpha () =default;
+		OpacityAlpha (double constalpha, double shapealpha) : _constalpha(constalpha), _shapealpha(shapealpha) {}
+		void setConstAlpha (double alpha) { _constalpha = alpha;}
+		void setShapeAlpha (double shapealpha) {_shapealpha = shapealpha;}
+		double value () const {return _constalpha * _shapealpha;}
+		bool operator == (const OpacityAlpha &alpha) const {return alpha._constalpha == _constalpha && alpha._shapealpha == _shapealpha;}
+		bool operator != (const OpacityAlpha &alpha) const {return alpha._constalpha != _constalpha || alpha._shapealpha != _shapealpha;}
+		bool isOpaque () const {return _constalpha == 1.0 && _shapealpha == 1.0;}
+
+	private:
+		double _constalpha=1.0;
+		double _shapealpha=1.0;
+};
+
+class Opacity {
+	public:
+		enum BlendMode {
+			BM_NORMAL, BM_MULTIPLY, BM_SCREEN, BM_OVERLAY,
+			BM_SOFTLIGHT, BM_HARDLIGHT, BM_COLORDODGE, BM_COLORBURN,
+			BM_DARKEN, BM_LIGHTEN, BM_DIFFERENCE, BM_EXCLUSION,
+			BM_HUE, BM_SATURATION, BM_COLOR, BM_LUMINOSITY
+		};
+
+   public:
+		Opacity () =default;
+		Opacity (OpacityAlpha fillalpha, OpacityAlpha strokealpha, BlendMode bm) : _fillalpha(fillalpha), _strokealpha(strokealpha), _blendMode(bm) {}
+		Opacity (OpacityAlpha fillalpha, OpacityAlpha strokealpha) : Opacity(fillalpha, strokealpha, BM_NORMAL) {}
+      explicit Opacity (BlendMode bm) : _blendMode(bm) {}
+		OpacityAlpha& fillalpha () {return _fillalpha;}
+		OpacityAlpha& strokealpha () {return _strokealpha;}
+		const OpacityAlpha& fillalpha () const {return _fillalpha;}
+		const OpacityAlpha& strokealpha () const {return _strokealpha;}
+		BlendMode blendMode () const {return _blendMode;}
+		void setBlendMode (BlendMode mode) {_blendMode = mode;}
+		std::string cssBlendMode () const {return cssBlendMode(_blendMode);}
+		static std::string cssBlendMode (BlendMode bm);
+		bool isFillDefault () const {return _fillalpha.isOpaque() && _blendMode == BM_NORMAL;}
+		bool isStrokeDefault () const {return _strokealpha.isOpaque() && _blendMode == BM_NORMAL;}
+		bool operator == (const Opacity &opacity) const;
+		bool operator != (const Opacity &opacity) const;
+
+   private:
+		OpacityAlpha _fillalpha;
+		OpacityAlpha _strokealpha;
+		BlendMode _blendMode=BM_NORMAL;
+};
+
+#endif