Esempio n. 1
0
        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;
            }
        }
Esempio n. 2
0
        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);
            }
        }