private static Color GetBestPixel(Color true_color, IColorAlgorithm algorithm, IJavaVersion mapping)
{
// partial transparency is not allowed
if (true_color.A < 128)
{
return(Color.FromArgb(0, 0, 0, 0));
}
if (NearestColorCache.TryGetValue(true_color, out var cached))
{
return(cached);
}
Color best_approximate = Color.Empty;
double mindist = Double.PositiveInfinity;
// find the color in the palette that is closest to this one
foreach (Color mapcolor in mapping.GetAllColors().Where(o => o.A == 255))
{
double distance = algorithm.Distance(true_color, mapcolor);
if (mindist > distance)
{
mindist = distance;
best_approximate = mapcolor;
}
}
NearestColorCache.Set(true_color, best_approximate);
return(best_approximate);
}
public static IEnumerable <JavaMap> FromSettings(MapCreationSettings settings)
{
Bitmap original = ResizeImg(settings.Original, MAP_WIDTH * settings.SplitW, MAP_HEIGHT * settings.SplitH, settings.InterpMode);
LockBitmap final = new LockBitmap((Bitmap)original.Clone());
final.LockBits();
// first index = which map this is
var colors = new byte[settings.SplitW * settings.SplitH][];
for (int i = 0; i < colors.Length; i++)
{
colors[i] = new byte[MAP_WIDTH * MAP_HEIGHT];
}
#region java map algorithm
for (int y = 0; y < final.Height; y++)
{
for (int x = 0; x < final.Width; x++)
{
Color oldpixel = final.GetPixel(x, y);
Color newpixel = Color.Empty;
// partial transparency is not allowed
if (oldpixel.A < 128)
{
newpixel = Color.FromArgb(0, 0, 0, 0);
}
else
{
if (!NearestColorCache.TryGetValue(oldpixel, out newpixel))
{
double mindist = Double.PositiveInfinity;
// find the color in the palette that is closest to this one
foreach (Color mapcolor in ColorToByte.Keys.Where(o => o.A == 255))
{
double distance = ColorDistance(oldpixel, mapcolor);
if (mindist > distance)
{
mindist = distance;
newpixel = mapcolor;
}
}
NearestColorCache[oldpixel] = newpixel;
}
}
final.SetPixel(x, y, newpixel);
if (settings.Dither)
{
// floyd-steinberg
int error_a = oldpixel.A - newpixel.A;
int error_r = oldpixel.R - newpixel.R;
int error_g = oldpixel.G - newpixel.G;
int error_b = oldpixel.B - newpixel.B;
GiveError(final, x + 1, y, error_a, error_r, error_g, error_b, 7);
GiveError(final, x - 1, y + 1, error_a, error_r, error_g, error_b, 3);
GiveError(final, x, y + 1, error_a, error_r, error_g, error_b, 5);
GiveError(final, x + 1, y + 1, error_a, error_r, error_g, error_b, 1);
}
int currentmap = y / MAP_HEIGHT * settings.SplitW + x / MAP_WIDTH;
int currentpixel = MAP_WIDTH * (y % MAP_HEIGHT) + (x % MAP_WIDTH);
if (newpixel == Color.FromArgb(0, 0, 0, 0))
{
colors[currentmap][currentpixel] = 0x00;
}
else
{
colors[currentmap][currentpixel] = ColorToByte[newpixel];
}
}
}
#endregion
final.UnlockBits();
var maps = new List <JavaMap>();
for (int y = 0; y < settings.SplitH; y++)
{
for (int x = 0; x < settings.SplitW; x++)
{
Rectangle crop = new Rectangle(
x * original.Width / settings.SplitW,
y * original.Height / settings.SplitH,
original.Width / settings.SplitW,
original.Height / settings.SplitH);
maps.Add(new JavaMap(
CropImage(original, crop),
CropImage(final.GetImage(), crop),
colors[settings.SplitW * y + x]));
}
}
return(maps);
}
