/// <summary>
/// Transfers a single ARGB channel from one image to another.
/// </summary>
/// <param name="source">
/// The source.
/// </param>
/// <param name="destination">
/// The destination.
/// </param>
/// <param name="sourceChannel">
/// The source channel.
/// </param>
/// <param name="destinationChannel">
/// The destination channel.
/// </param>
private static void TransferOneArgbChannelFromOneBitmapToAnother(Bitmap source, Bitmap destination, ChannelArgb sourceChannel, ChannelArgb destinationChannel)
{
if (source.Size != destination.Size)
{
throw new ArgumentException();
}
Rectangle rectangle = new Rectangle(Point.Empty, source.Size);
// Lockbits the source.
BitmapData bitmapDataSource = source.LockBits(rectangle, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
// Declare an array to hold the bytes of the bitmap.
int bytes = bitmapDataSource.Stride * bitmapDataSource.Height;
// Allocate a buffer for the source image
byte[] sourceRgbValues = new byte[bytes];
// Copy the RGB values into the array.
Marshal.Copy(bitmapDataSource.Scan0, sourceRgbValues, 0, bytes);
// Unlockbits the source.
source.UnlockBits(bitmapDataSource);
// Lockbits the destination.
BitmapData bitmapDataDestination = destination.LockBits(rectangle, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
// Allocate a buffer for image
byte[] destinationRgbValues = new byte[bytes];
// Copy the RGB values into the array.
Marshal.Copy(bitmapDataDestination.Scan0, destinationRgbValues, 0, bytes);
int s = (int)sourceChannel;
int d = (int)destinationChannel;
for (int i = rectangle.Height * rectangle.Width; i > 0; i--)
{
destinationRgbValues[d] = sourceRgbValues[s];
d += 4;
s += 4;
}
// Copy the RGB values back to the bitmap
Marshal.Copy(destinationRgbValues, 0, bitmapDataDestination.Scan0, bytes);
// Unlock bits the destination.
destination.UnlockBits(bitmapDataDestination);
}
/// <summary>
/// Transfers a single ARGB channel from one image to another.
/// </summary>
/// <param name="source">
/// The source.
/// </param>
/// <param name="destination">
/// The destination.
/// </param>
/// <param name="sourceChannel">
/// The source channel.
/// </param>
/// <param name="destinationChannel">
/// The destination channel.
/// </param>
private static void TransferOneArgbChannelFromOneBitmapToAnother(Bitmap source, Bitmap destination, ChannelArgb sourceChannel, ChannelArgb destinationChannel)
{
if (source.Size != destination.Size)
{
throw new ArgumentException();
}
Rectangle rectangle = new Rectangle(Point.Empty, source.Size);
// Lock the source.
BitmapData bitmapDataSource = source.LockBits(rectangle, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
// Declare an array to hold the bytes of the bitmap.
int bytes = bitmapDataSource.Stride * bitmapDataSource.Height;
// Allocate a buffer for the source image
byte[] sourceRgbValues = new byte[bytes];
// Copy the RGB values into the array.
Marshal.Copy(bitmapDataSource.Scan0, sourceRgbValues, 0, bytes);
// Unlock the source.
source.UnlockBits(bitmapDataSource);
// Lock the destination.
BitmapData bitmapDataDestination = destination.LockBits(rectangle, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
// Allocate a buffer for image
byte[] destinationRgbValues = new byte[bytes];
// Copy the RGB values into the array.
Marshal.Copy(bitmapDataDestination.Scan0, destinationRgbValues, 0, bytes);
int s = (int)sourceChannel;
int d = (int)destinationChannel;
for (int i = rectangle.Height * rectangle.Width; i > 0; i--)
{
// Copy the alpha values across.
if (destinationRgbValues[d] != 0)
{
destinationRgbValues[d] = sourceRgbValues[s];
}
d += 4;
s += 4;
}
// Copy the RGB values back to the bitmap
Marshal.Copy(destinationRgbValues, 0, bitmapDataDestination.Scan0, bytes);
// Unlock bits the destination.
destination.UnlockBits(bitmapDataDestination);
}
