private void ApplyFilter()
{
if (picSource.Image != null)
{
ColorSwapFilter swapFilter = new ColorSwapFilter();
swapFilter.SwapType = (ColorSwapFilter.ColorSwapType)cmbFilterType.SelectedItem;
swapFilter.InvertColorsWhenSwapping = chkInvertColours.Checked;
swapFilter.SwapHalfColorValues = chkHalfColours.Checked;
picResult.Image = ((Bitmap)(picSource.Image)).SwapColorsCopy(swapFilter);
}
}
public static Bitmap SwapColorsCopy(this Bitmap originalImage, ColorSwapFilter swapFilterData)
{
BitmapData sourceData = originalImage.LockBits
(new Rectangle(0, 0, originalImage.Width, originalImage.Height),
ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
byte[] resultBuffer = new byte[sourceData.Stride * sourceData.Height];
Marshal.Copy(sourceData.Scan0, resultBuffer, 0, resultBuffer.Length);
originalImage.UnlockBits(sourceData);
byte sourceBlue = 0, resultBlue = 0,
sourceGreen = 0, resultGreen = 0,
sourceRed = 0, resultRed = 0;
byte byte2 = 2, maxValue = 255;
for (int k = 0; k < resultBuffer.Length; k += 4)
{
sourceBlue = resultBuffer[k];
sourceGreen = resultBuffer[k + 1];
sourceRed = resultBuffer[k + 2];
if (swapFilterData.InvertColorsWhenSwapping == true)
{
sourceBlue = (byte)(maxValue - sourceBlue);
sourceGreen = (byte)(maxValue - sourceGreen);
sourceRed = (byte)(maxValue - sourceRed);
}
if (swapFilterData.SwapHalfColorValues == true)
{
sourceBlue = (byte)(sourceBlue / byte2);
sourceGreen = (byte)(sourceGreen / byte2);
sourceRed = (byte)(sourceRed / byte2);
}
switch (swapFilterData.SwapType)
{
case ColorSwapFilter.ColorSwapType.ShiftRight:
{
resultBlue = sourceGreen;
resultRed = sourceBlue;
resultGreen = sourceRed;
break;
}
case ColorSwapFilter.ColorSwapType.ShiftLeft:
{
resultBlue = sourceRed;
resultRed = sourceGreen;
resultGreen = sourceBlue;
break;
}
case ColorSwapFilter.ColorSwapType.SwapBlueAndRed:
{
resultBlue = sourceRed;
resultRed = sourceBlue;
break;
}
case ColorSwapFilter.ColorSwapType.SwapBlueAndGreen:
{
resultBlue = sourceGreen;
resultGreen = sourceBlue;
break;
}
case ColorSwapFilter.ColorSwapType.SwapRedAndGreen:
{
resultRed = sourceGreen;
resultGreen = sourceGreen;
break;
}
}
resultBuffer[k] = resultBlue;
resultBuffer[k + 1] = resultGreen;
resultBuffer[k + 2] = resultRed;
}
Bitmap resultBitmap = new Bitmap(originalImage.Width, originalImage.Height,
PixelFormat.Format32bppArgb);
BitmapData resultData = resultBitmap.LockBits
(new Rectangle(0, 0, resultBitmap.Width, resultBitmap.Height),
ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
Marshal.Copy(resultBuffer, 0, resultData.Scan0, resultBuffer.Length);
resultBitmap.UnlockBits(resultData);
return(resultBitmap);
}
