summaryrefslogtreecommitdiff
path: root/dviware/dvisvgm/src/Opacity.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'dviware/dvisvgm/src/Opacity.hpp')
-rw-r--r--dviware/dvisvgm/src/Opacity.hpp75
1 files changed, 75 insertions, 0 deletions
diff --git a/dviware/dvisvgm/src/Opacity.hpp b/dviware/dvisvgm/src/Opacity.hpp
new file mode 100644
index 0000000000..8a4e1edac6
--- /dev/null
+++ b/dviware/dvisvgm/src/Opacity.hpp
@@ -0,0 +1,75 @@
+/*************************************************************************
+** Opacity.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 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