/// <summary>
/// Perform smoothing with or without dithering.
/// </summary>
/// <param name="srcMap">Source map.</param>
/// <param name="destMap">Destination map.</param>
/// <param name="dither">Function should apply dithering.</param>
private static void smoothDitherMap(ByteMap2 srcMap, ByteMap2 destMap, bool dither)
{
if (dither)
{
int x, y = 0, z = 0, dir = 1;
for (x = 0; x < srcMap.width; x++)
{
for (; y != srcMap.height && y != -1; y += dir)
{
z +=
srcMap.Get((x == 0) ? x : (x - 1), y) +
srcMap.Get((x == srcMap.width - 1) ? x : (x + 1), y) +
srcMap.Get(x, (y == 0) ? (0) : (y - 1)) +
srcMap.Get(x, (y == (srcMap.height - 1)) ? y : (y + 1)) +
srcMap.Get(x, y);
Byte val = (Byte)(z / 4);
destMap.Set(x, y, val);
z &= 3;
}
dir = -dir;
y += dir;
}
}
else
{
int x, y, z;
for (x = 0; x < srcMap.width; x++)
{
for (y = 0; y < srcMap.height; y++)
{
z = 0;
if (x > 0)
{
z += srcMap.Get(x - 1, y);
}
if (x < srcMap.width - 1)
{
z += srcMap.Get(x + 1, y);
}
if (y > 0)
{
z += srcMap.Get(x, y - 1);
}
if (y < (srcMap.height - 1))
{
z += srcMap.Get(x, y + 1);
}
z = (z + srcMap.Get(x, y)) >> 2;
if (z > 255)
{
z = 255;
}
destMap.Set(x, y, (Byte)z);
}
}
}
}
