/// <summary>
///
/// </summary>
/// <param name="nValue"></param>
/// <param name="nChannel"></param>
public ColourFilterStruct(byte nValue, FilterColour nChannel)
{
m_nValue = nValue;
m_nChannel = nChannel;
}
public void ApplyColourFilter(FilterColour nFilterColour, byte nMod)
{
if (m_oBitmap == null)
return;
BitmapData oBmpData = m_oBitmap.LockBits(new Rectangle(Point.Empty, m_oBitmap.Size),
ImageLockMode.ReadWrite, m_oBitmap.PixelFormat);
IntPtr pScanLine = oBmpData.Scan0;
int nBytes = oBmpData.Stride * oBmpData.Height;
byte[] nByteArray = new byte[nBytes];
// Marshal the unmanaged byte array to a managed byte array.
Marshal.Copy(pScanLine, nByteArray, 0, nBytes);
int nRed = 0;
int nGreen = 0;
int nBlue = 0;
// Run through the byte array.
for (int n = 0; n < nByteArray.Length; n += 4)
{
switch (nFilterColour)
{
case FilterColour.Red:
nRed = nByteArray[n + 2] + nMod;
if (nRed < 0) nRed = 0;
else if (nRed > 255) nRed = 255;
nByteArray[n] = 0;
nByteArray[n + 1] = 0;
nByteArray[n + 2] = (byte)nRed;
break;
case FilterColour.Green:
nGreen = nByteArray[n + 1] + nMod;
if (nGreen < 0) nGreen = 0;
else if (nGreen > 255) nGreen = 255;
nByteArray[n] = 0;
nByteArray[n + 1] = (byte)nGreen;
nByteArray[n + 2] = 0;
break;
case FilterColour.Blue:
nBlue = nByteArray[n] + nMod;
if (nBlue < 0) nBlue = 0;
else if (nBlue > 255) nBlue = 255;
nByteArray[n] = (byte)nBlue;
nByteArray[n + 1] = 0;
nByteArray[n + 2] = 0;
break;
}
}
// Marshal the managed byte array back to an unmanaged byte array.
Marshal.Copy(nByteArray, 0, pScanLine, nBytes);
// Unlock the bitmap.
m_oBitmap.UnlockBits(oBmpData);
}
