protected override unsafe void ProcessFilter( UnmanagedImage image, Rectangle rect )
{
// get pixel size
int pixelSize = ( image.PixelFormat == PixelFormat.Format24bppRgb ) ? 3 : 4;
int startX = rect.Left;
int startY = rect.Top;
int stopX = startX + rect.Width;
int stopY = startY + rect.Height;
int offset = image.Stride - rect.Width * pixelSize;
RGB rgb = new RGB( );
HSL hsl = new HSL( );
bool updated;
// do the job
byte* ptr = (byte*) image.ImageData.ToPointer( );
// allign pointer to the first pixel to process
ptr += ( startY * image.Stride + startX * pixelSize );
// for each row
for ( int y = startY; y < stopY; y++ )
{
// for each pixel
for ( int x = startX; x < stopX; x++, ptr += pixelSize )
{
updated = false;
rgb.Red = ptr[RGB.R];
rgb.Green = ptr[RGB.G];
rgb.Blue = ptr[RGB.B];
// convert to HSL
AForge.Imaging.HSL.FromRGB( rgb, hsl );
// check HSL values
if (
( hsl.Saturation >= saturation.Min ) && ( hsl.Saturation <= saturation.Max ) &&
( hsl.Luminance >= luminance.Min ) && ( hsl.Luminance <= luminance.Max ) &&
(
( ( hue.Min < hue.Max ) && ( hsl.Hue >= hue.Min ) && ( hsl.Hue <= hue.Max ) ) ||
( ( hue.Min > hue.Max ) && ( ( hsl.Hue >= hue.Min ) || ( hsl.Hue <= hue.Max ) ) )
)
)
{
if ( !fillOutsideRange )
{
if ( updateH ) hsl.Hue = fillH;
if ( updateS ) hsl.Saturation = fillS;
if ( updateL ) hsl.Luminance = fillL;
updated = true;
}
}
else
{
if ( fillOutsideRange )
{
if ( updateH ) hsl.Hue = fillH;
if ( updateS ) hsl.Saturation = fillS;
if ( updateL ) hsl.Luminance = fillL;
updated = true;
}
}
if ( updated )
{
// convert back to RGB
AForge.Imaging.HSL.ToRGB( hsl, rgb );
ptr[RGB.R] = rgb.Red;
ptr[RGB.G] = rgb.Green;
ptr[RGB.B] = rgb.Blue;
}
}
ptr += offset;
}
}
}