private static byte[] LookupPixels(int[] imageData, uint[] palette)
{
byte[] indexedData = new byte[imageData.Length];
PaletteLookup paletteLookup = new PaletteLookup(palette);
for (int i = 0; i < indexedData.Length; ++i)
{
indexedData[i] = paletteLookup.GetPaletteIndex((uint)imageData[i]);
}
return(indexedData);
}
private static byte[] IndexedPixels(Color[] pixels, WuPixel[] lookups, int alphaThreshold, int maxColors, PaletteColorHistory[] paletteHistogram)
{
var length = maxColors == 256 ? pixels.Length : maxColors == 16 ? pixels.Length / 2 : throw new Exception("IndexedPixels: unknown pixelformat");
byte[] returned = new byte[length];
PaletteLookup lookup = new PaletteLookup(lookups);
--maxColors;
for (int i = 0; i < pixels.Length; i++)
{
WuPixel pixel = new WuPixel(pixels[i].A, pixels[i].R, pixels[i].G, pixels[i].B);
byte bestMatch = (byte)maxColors;
if (pixel.Alpha > alphaThreshold)
{
bestMatch = lookup.GetPaletteIndex(pixel);
paletteHistogram[bestMatch].AddPixel(pixel);
}
switch (maxColors)
{
case 256 - 1:
returned[i] = bestMatch;
break;
case 16 - 1:
if (i % 2 == 0)
{
returned[i / 2] = (byte)(bestMatch << 4);
}
else
{
returned[i / 2] |= (byte)(bestMatch & 0x0F);
}
break;
case 2 - 1:
if (i % 8 == 0)
{
returned[i / 8] = (byte)(bestMatch << 7);
}
else
{
returned[i / 8] |= (byte)((bestMatch & 0x01) << (7 - (i % 8)));
}
break;
}
}
return(returned);
}