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graphics/conversion.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM 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 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 GRAPHICS_CONVERSION_H
+#define GRAPHICS_CONVERSION_H
+
+#include "common/util.h"
+
+namespace Graphics {
+
+/**
+ * @defgroup graphics_conversion Conversions
+ * @ingroup graphics
+ *
+ * @brief Graphics conversion operations.
+ *
+ * @{
+ */
+
+/** Converting a color from YUV to RGB colorspace. */
+inline static void YUV2RGB(byte y, byte u, byte v, byte &r, byte &g, byte &b) {
+	r = CLIP<int>(y + ((1357 * (v - 128)) >> 10), 0, 255);
+	g = CLIP<int>(y - (( 691 * (v - 128)) >> 10) - ((333 * (u - 128)) >> 10), 0, 255);
+	b = CLIP<int>(y + ((1715 * (u - 128)) >> 10), 0, 255);
+}
+
+/** Converting a color from RGB to YUV colorspace. */
+inline static void RGB2YUV(byte r, byte g, byte b, byte &y, byte &u, byte &v) {
+	y = CLIP<int>( ((r * 306) >> 10) + ((g * 601) >> 10) + ((b * 117) >> 10)      , 0, 255);
+	u = CLIP<int>(-((r * 172) >> 10) - ((g * 340) >> 10) + ((b * 512) >> 10) + 128, 0, 255);
+	v = CLIP<int>( ((r * 512) >> 10) - ((g * 429) >> 10) - ((b *  83) >> 10) + 128, 0, 255);
+}
+
+/** @} */
+} // End of namespace Graphics
+
+#endif // GRAPHICS_CONVERSION_H