public byte[] Compress(byte[] image)
{
uint position = 0;
// check format
List <byte> result = new List <byte>();
// cut headers
var header = new BmpHeader(image);
foreach (byte b in header.ToArray())
{
result.Add(b);
}
position = header.OffsetBits;
Format fmt = Format.BGR;
#region PRE actions
List <Color> difRow = new List <Color>();
Color prev = ReadColor(image, position, fmt);
position += 3;
Color current = ReadColor(image, position, fmt);
position += 3;
Color next = Color.FromArgb(2, 45, 78);
sbyte row = 0;
if (prev == current)
{
row = 0;
}
else
{
row = -1;
}
#endregion PRE actions
#region MAIN loop
for (; position < image.Length; position += 3)
{
next = ReadColor(image, position, fmt);
if (current == prev) // AAx
{
if (row >= 0)
{
row++;
if (row >= 127)// TODO check overflow
{
result.Add((byte)row);
result.Add(prev.R);
result.Add(prev.G);
result.Add(prev.B);
row = 0;
}
}
else
{
throw new Exception("Something went wrong");
}
}
else // ABx
{
if (row >= 0)
{
row++;
result.Add((byte)row);
result.Add(prev.R);
result.Add(prev.G);
result.Add(prev.B);
if (current == next)
{
row = 0;
}
else
{
row = -1;
}
}
else
{
difRow.Add(prev);
if (current == next || difRow.Count >= 128) // Check overflow
{
SaveDif(result, difRow);
row = 0;
}
}
}
prev = current;
current = next;
}
#endregion MAIN loop
#region POST actions
if (current == prev) // AAx
{
if (row >= 0)
{
row++;
if (row >= 127)
{
result.Add((byte)row);
result.Add(prev.R);
result.Add(prev.G);
result.Add(prev.B);
row = 0;
}
row++;
result.Add((byte)row);
result.Add(prev.R);
result.Add(prev.G);
result.Add(prev.B);
}
else
{
throw new Exception("Something went wrong");
}
}
else // ABx
{
if (row >= 0)
{
row++;
result.Add((byte)row);
result.Add(prev.R);
result.Add(prev.G);
result.Add(prev.B);
}
else
{
difRow.Add(prev);
difRow.Add(current);
SaveDif(result, difRow);
}
}
#endregion POST actions
return(result.ToArray());
}