Sync MainUI with upstream

ColorUtils.h

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+/*
+ColorUtils.h - color utilities
+Copyright (C) 2026 $_Vladislav
+
+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.
+*/
+
+#pragma once
+#ifndef COLORUTILS_H
+#define COLORUTILS_H
+
+#include <math.h>
+#include "Utils.h"
+
+namespace ColorUtils
+{
+
+inline void HSVtoRGB( float h, float s, float v, byte &r, byte &g, byte &b )
+{
+	float R, G, B;
+
+	// Normalize hue to [0, 360)
+	h = fmodf( h, 360.f );
+	if( h < 0.f )
+		h += 360.f;
+
+	if( s <= 0.f )
+	{
+		R = G = B = v;
+	}
+	else
+	{
+		float hh = h / 60.f;
+		int   i  = (int)hh % 6;
+		float ff = hh - (int)hh;
+		float p  = v * ( 1.f - s );
+		float q  = v * ( 1.f - s * ff );
+		float t  = v * ( 1.f - s * ( 1.f - ff ) );
+
+		switch( i )
+		{
+		case 0: R = v; G = t; B = p; break;
+		case 1: R = q; G = v; B = p; break;
+		case 2: R = p; G = v; B = t; break;
+		case 3: R = p; G = q; B = v; break;
+		case 4: R = t; G = p; B = v; break;
+		default:R = v; G = p; B = q; break;
+		}
+	}
+
+	r = (byte)( R * 255.f + 0.5f );
+	g = (byte)( G * 255.f + 0.5f );
+	b = (byte)( B * 255.f + 0.5f );
+}
+
+inline void RGBtoHSV( byte r, byte g, byte b, float &h, float &s, float &v )
+{
+	float R = r / 255.f;
+	float G = g / 255.f;
+	float B = b / 255.f;
+
+	float cmax  = Q_max( R, Q_max( G, B ) );
+	float cmin  = Q_min( R, Q_min( G, B ) );
+	float delta = cmax - cmin;
+
+	v = cmax;
+	s = ( cmax > 0.f ) ? ( delta / cmax ) : 0.f;
+
+	if( delta <= 0.f )
+	{
+		h = 0.f;
+	}
+	else if( cmax == R )
+	{
+		h = 60.f * fmodf( ( G - B ) / delta, 6.f );
+	}
+	else if( cmax == G )
+	{
+		h = 60.f * ( ( B - R ) / delta + 2.f );
+	}
+	else
+	{
+		h = 60.f * ( ( R - G ) / delta + 4.f );
+	}
+
+	if( h < 0.f )
+		h += 360.f;
+}
+
+} // namespace ColorUtils
+
+#endif // COLORUTILS_H