static private void RefineMinMax(ARGB_Rev[] Colors, ref ARGB_Rev Min, ref ARGB_Rev Max)
{
int MinListCount = 0;
int MaxListCount = 0;
var MinAccum = default(RGBA32);
var MaxAccum = default(RGBA32);
foreach (var color in Colors)
{
int DistanceMin = ARGB_Rev.DistanceRGB(color, Min);
int DistanceMax = ARGB_Rev.DistanceRGB(color, Max);
if (DistanceMin <= DistanceMax)
{
MinAccum += color;
MinListCount++;
}
if (DistanceMax <= DistanceMin)
{
MaxAccum += color;
MaxListCount++;
}
}
Min = MinAccum / MinListCount;
Max = MaxAccum / MaxListCount;
Min.A = 0xFF;
Max.A = 0xFF;
}
static public int ColorToIndexed(ARGB_Rev[] Colors, ARGB_Rev[] Palette, byte[] Indices)
{
int TotalDistance = 0;
for (int n = 0; n < 16; n++)
{
var Color = Colors[n];
int MinDistance = int.MaxValue;
int BestIndex = 0;
for (int m = 0; m < 4; m++)
{
var Distance = ARGB_Rev.DistanceRGB(Color, Palette[m]);
if (Distance < MinDistance)
{
BestIndex = m;
MinDistance = Distance;
}
}
TotalDistance += MinDistance;
Indices[n] = (byte)BestIndex;
}
return(TotalDistance);
}