public static int GetClosestColorWithAlpha(Color c, Color[] pal)
{
int bestInd = 0;
float bestDif = ImageIndexer.ColorDifference(pal[0], c);
for (int i = 0; i < pal.Length; i++)
{
float d = ImageIndexer.ColorDifference(pal[i], c);
if (d < bestDif)
{
bestDif = d;
bestInd = i;
}
}
return(bestInd);
}
public static EncodedImage Encode_Tex4x4(Bitmap Image, int MaximumNumberofPalettes)
{
int tx = Image.Width / 4;
int ty = Image.Height / 4;
Color[][] Palettes = new Color[tx * ty][];
int[] PaletteCounts = new int[tx * ty];
int[,] PaletteNumbers = new int[tx, ty];
int PaletteNumber = 0;
for (int x = 0; x < tx; x++)
{
for (int y = 0; y < ty; y++)
{
ImageIndexer Indexer = new ImageIndexer(Image, x * 4, y * 4);
Palettes[PaletteNumber] = Indexer.palette;
PaletteNumbers[x, y] = PaletteNumber;
PaletteCounts[PaletteNumber] = 1;
PaletteNumber++;
}
}
int Current = 0;
Color[] FinalPalette = new Color[MaximumNumberofPalettes * 4];
int[] NewPaletteNumbers = new int[Palettes.Length];
for (int i = 0; i < Palettes.Length; i++)
{
if (PaletteCounts[i] != 0)
{
NewPaletteNumbers[i] = Current;
Array.Copy(Palettes[i], 0, FinalPalette, Current * 4, 4);
Current++;
}
}
List <byte> Data1List = new List <byte>();
List <byte> Data2List = new List <byte>();
for (int y = 0; y < ty; y++)
{
for (int x = 0; x < tx; x++)
{
bool HasTransparentPixels = false;
for (int yy = 0; yy < 4; yy++)
{
for (int xx = 0; xx < 4; xx++)
{
Color Colorl = Image.GetPixel(x * 4 + xx, y * 4 + yy);
if (Colorl.A < 128)
{
HasTransparentPixels = true;
}
}
}
for (int yy = 0; yy < 4; yy++)
{
byte FinalByte = 0;
byte Pow = 1;
for (int xx = 0; xx < 4; xx++)
{
Color Colorl = Image.GetPixel(x * 4 + xx, y * 4 + yy);
byte Color;
if (Colorl.A < 128)
{
Color = 3;
}
else
{
if (!HasTransparentPixels)
{
Color = (byte)GetClosestColor(Colorl, Palettes[PaletteNumbers[x, y]]);
}
else
{
Color = (byte)GetClosestColorWithAlpha(Colorl, Palettes[PaletteNumbers[x, y]]);
}
if (Color == 3)
{
Color = 2;
}
}
FinalByte |= (byte)(Pow * Color);
Pow *= 4;
}
Data1List.Add(FinalByte);
}
UInt16 Data = (UInt16)(NewPaletteNumbers[PaletteNumbers[x, y]] * 2);
if (!HasTransparentPixels)
{
Data |= 2 << 14;
}
byte[] P = BitConverter.GetBytes((UInt16)Data);
Data2List.Add(P[0]);
Data2List.Add(P[1]);
}
}
return(new EncodedImage(Data1List.ToArray(), EncodePalette(FinalPalette), Data2List.ToArray()));
}