Initial commit0.0.0

1 files changed, 101 insertions, 0 deletions

diff --git a/src/gui/colors.cpp b/src/gui/colors.cpp
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+++ b/src/gui/colors.cpp
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+////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2018 Leo Tenenbaum
+// This file is part of GraphColoring.
+//
+// GraphColoring 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.
+//
+// GraphColoring 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 GraphColoring.  If not, see <https://www.gnu.org/licenses/>.
+////////////////////////////////////////////////////////////////////////////////
+
+#include "colors.hpp"
+#include "utils/errors.hpp"
+
+#include <iostream>
+
+
+#define SHADE_FACTOR 1.5
+
+namespace gui {
+namespace colors {
+
+void Unpack(Color color, uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a)
+{
+    *r = (color >> 24) & 0xFF;
+    *g = (color >> 16) & 0xFF;
+    *b = (color >>  8) & 0xFF;
+    *a = (color >>  0) & 0xFF;
+}
+
+Color Pack(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
+{
+    return (r << 24) + (g << 16) + (b << 8) + (a << 0);
+}
+
+static uint8_t shade_channel(uint8_t channel, double factor)
+{
+    if (channel * factor > 0xFF)
+        channel = 0xFF;
+    else
+        channel *= factor;
+    return channel;
+}
+
+Color Shade(Color color, double factor)
+{
+    uint8_t r, g, b, a;
+    Unpack(color, &r, &g, &b, &a);
+    r = shade_channel(r, factor);
+    g = shade_channel(g, factor);
+    b = shade_channel(b, factor);
+    a = shade_channel(a, factor);
+    return Pack(r, g, b, a);
+}
+
+Color Light(Color color)
+{
+    return Shade(color, SHADE_FACTOR);
+}
+
+Color Dark(Color color)
+{
+    return Shade(color, 1/SHADE_FACTOR);
+}
+
+Color FromString(const std::string& str)
+{
+	uint8_t r, g, b, a;
+	try
+	{
+		r = std::stoi(str.substr(1,2),nullptr,16);
+		g = std::stoi(str.substr(3,2),nullptr,16);
+		b = std::stoi(str.substr(5,2),nullptr,16);
+		if (str.length() >= 9)
+			a = std::stoi(str.substr(7,2),nullptr,16);
+		else
+			a = 255;
+
+		return Pack(r, g, b, a);
+	}
+	catch (std::invalid_argument&)
+	{
+		utils::errors::Die("Invalid color string: " + str);
+	}
+	return 0;
+}
+
+Color FromAttribute(pugi::xml_attribute attr)
+{
+	return FromString(std::string(attr.value()));
+}
+
+} // namespace colors
+} // namespace gui