public void CreateGap(FastBitmap bitmap, int start, int length, GapBehavior behavior = GapBehavior.RandomBytes)
{
byte[] gapped = new byte[Math.Abs(length)];
int gap_pos = 0;
if (length > 0)
{
Array.Copy(bitmap.Data, start, gapped, 0, length);
Array.Copy(bitmap.Data, (start + length), bitmap.Data, start, bitmap.Data.Length - (start + length));
gap_pos = bitmap.Data.Length - length;
}
else
{
length = Math.Abs(length);
Buffer.BlockCopy(bitmap.Data, bitmap.Data.Length - start, gapped, 0, length);
Buffer.BlockCopy(bitmap.Data, start, bitmap.Data, (start + length), bitmap.Data.Length - (start + length));
gap_pos = start;
}
switch (behavior)
{
case GapBehavior.Black:
for (int i = gap_pos; i < gap_pos + length; i++)
{
bitmap.Data[i] = 0;
}
break;
case GapBehavior.White:
for (int i = gap_pos; i < gap_pos + length; i++)
{
bitmap.Data[i] = 255;
}
break;
case GapBehavior.RandomBytes:
byte[] rnd = new byte[length];
Random.NextBytes(rnd);
Array.Copy(rnd, 0, bitmap.Data, gap_pos, length);
break;
case GapBehavior.Gapped:
Array.Copy(gapped, 0, bitmap.Data, gap_pos, length);
break;
}
}
public void Apply(FastBitmap bmp)
{
Random rnd = new Random();
List <KeyValuePair <int, int> > gaps = new List <KeyValuePair <int, int> >();
for (int i = 0; i < GapCount; i++)
{
gaps.Add(new KeyValuePair <int, int>(
rnd.Next(bmp.Data.Length),
rnd.Next(MinGapLength, MaxGapLength)));
}
bool random = (Behavior == GapBehavior.Random);
foreach (var gap in gaps)
{
if (random)
{
Behavior = (GapBehavior)rnd.Next(Enum.GetNames(typeof(GapBehavior)).Length - 1); // skip Random
}
CreateGap(bmp, gap.Key, gap.Value, Behavior);
}
}