/// <summary>
/// Blends the colors based on the given weight values.
/// </summary>
/// <param name="c">The array of color values.</param>
/// <param name="w">The array of weight values.</param>
/// <returns>
/// The weights should be fixed point numbers.
/// The total summation of the weight values will be treated as "1.0".
/// Each color will be blended in proportionally to its weight value respective to
/// the total summation of the weight values.
/// </returns>
/// <remarks>
/// "WAIP" stands for "weights, arbitrary integer precision"</remarks>
public static ColorBgra BlendColorsWAIP(ColorBgra[] c, uint[] w)
{
if (c.Length != w.Length)
{
throw new ArgumentException("c.Length != w.Length");
}
if (c.Length == 0)
{
return(ColorBgra.FromUInt32(0));
}
long wsum = 0;
long asum = 0;
for (int i = 0; i < w.Length; ++i)
{
wsum += w[i];
asum += c[i].A * w[i];
}
uint a = (uint)((asum + (wsum >> 1)) / wsum);
long b;
long g;
long r;
if (a == 0)
{
b = 0;
g = 0;
r = 0;
}
else
{
b = 0;
g = 0;
r = 0;
for (int i = 0; i < c.Length; ++i)
{
b += (long)c[i].A * c[i].B * w[i];
g += (long)c[i].A * c[i].G * w[i];
r += (long)c[i].A * c[i].R * w[i];
}
b /= asum;
g /= asum;
r /= asum;
}
return(ColorBgra.FromUInt32((uint)b + ((uint)g << 8) + ((uint)r << 16) + ((uint)a << 24)));
}
public override ColorBgra Apply(ColorBgra color)
{
return(ColorBgra.FromUInt32(color.Bgra | 0xff000000));
}
public override ColorBgra Apply(ColorBgra color)
{
return(ColorBgra.FromUInt32((color.Bgra & 0x00ffffff) + addValue));
}
public static ColorBgra ParseHexString(string hexString)
{
uint value = Convert.ToUInt32(hexString, 16);
return(ColorBgra.FromUInt32(value));
}