From ac164afa0954e28b521dc6b19d2ccf0320cc8ed1 Mon Sep 17 00:00:00 2001
From: Alexander Sulfrian <alexander@sulfrian.net>
Date: Tue, 8 Apr 2014 05:17:27 +0200
Subject: utils/colors: move colors into subdir, add hsv

All color classes are now in an own subdirectory with a short name.
The new class HsvColor represents the Hue/Saturation/Value color model and
comes with conversion functions to and from rgb colors (currently integer
arithmetic without optimization for higher presicion).
---
 src/utils/color/hsv.cpp | 105 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 src/utils/color/hsv.cpp

(limited to 'src/utils/color/hsv.cpp')

diff --git a/src/utils/color/hsv.cpp b/src/utils/color/hsv.cpp
new file mode 100644
index 00000000..11df9ec2
--- /dev/null
+++ b/src/utils/color/hsv.cpp
@@ -0,0 +1,105 @@
+/*
+ * UltraStar Deluxe - Karaoke Game
+ *
+ * UltraStar Deluxe is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 2
+ * 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; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "hsv.hpp"
+#include "rgb.hpp"
+
+namespace usdx
+{
+	HsvColor::HsvColor(uint8_t hue, uint8_t saturation, uint8_t value)
+		: hue(hue), saturation(saturation), value(value)
+	{
+	}
+
+	HsvColor::HsvColor(const HsvColor& color)
+		: hue(color.hue), saturation(color.saturation), value(color.value)
+	{
+	}
+
+	HsvColor::HsvColor(const RgbColor& rgb)
+		: hue(0), saturation(0), value(0)
+	{
+		// find min and max RGB value
+		uint8_t rgb_min = rgb.get_red();
+		if (rgb.get_green() < rgb_min) rgb_min = rgb.get_green();
+		if (rgb.get_blue() < rgb_min) rgb_min = rgb.get_blue();
+
+		uint8_t rgb_max = rgb.get_red();
+		if (rgb.get_green() > rgb_max) rgb_max = rgb.get_green();
+		if (rgb.get_blue() > rgb_max)  rgb_max = rgb.get_blue();
+
+		uint8_t rgb_delta = rgb_max - rgb_min;
+
+		if (rgb_max != 0) {
+			// compute value
+			value = rgb_max;
+
+			if (rgb_delta != 0) {
+				// compute saturation
+				saturation = (255 * (rgb_max - rgb_min)) / value;
+
+				// compute hue
+				if (rgb_max == rgb.get_red()) {
+					hue = 0 + 43 * (rgb.get_green() - rgb.get_blue()) / rgb_delta;
+				} else if (rgb_max == rgb.get_green()) {
+					hue = 85 + 43 * (rgb.get_blue() - rgb.get_red()) / rgb_delta;
+				} else /* rgb_max == rgb.get_blue() */ {
+					hue = 171 + 43 * (rgb.get_red() - rgb.get_green()) / rgb_delta;
+				}
+			}
+		}
+	}
+
+	HsvColor::~HsvColor()
+	{
+	}
+
+	HsvColor& HsvColor::operator=(const HsvColor& color)
+	{
+		if (this != &color) {
+			hue = color.hue;
+			saturation = color.saturation;
+			value = color.value;
+		}
+
+		return *this;
+
+	}
+
+	uint8_t HsvColor::get_hue(void) const
+	{
+		return hue;
+	}
+
+	uint8_t HsvColor::get_saturation(void) const
+	{
+		return saturation;
+	}
+
+	uint8_t HsvColor::get_value(void) const
+	{
+		return value;
+	}
+
+};
-- 
cgit v1.2.3