protected override unsafe void ProcessFilter(UnmanagedImage image, Rectangle rect)
{
int pixelSize = Image.GetPixelFormatSize(image.PixelFormat) / 16;
// processing start and stop X,Y positions
int startX = rect.Left;
int startY = rect.Top;
int stopX = startX + rect.Width;
int stopY = startY + rect.Height;
// do the job
byte* basePtr = (byte*)image.ImageData.ToPointer();
if (image.PixelFormat == PixelFormat.Format16bppGrayScale)
{
// grayscale image
for (int y = startY; y < stopY; y++)
{
ushort* ptr = (ushort*)(basePtr + y * image.Stride) + startX;
for (int x = startX; x < stopX; x++, ptr++)
{
// gray
*ptr = mapGreen[*ptr];
}
}
}
else
{
// RGB image
for (int y = startY; y < stopY; y++)
{
ushort* ptr = (ushort*)(basePtr + y * image.Stride) + startX * pixelSize;
for (int x = startX; x < stopX; x++, ptr += pixelSize)
{
// red
ptr[RGB.R] = mapRed[ptr[RGB.R]];
// green
ptr[RGB.G] = mapGreen[ptr[RGB.G]];
// blue
ptr[RGB.B] = mapBlue[ptr[RGB.B]];
}
}
}
}