//***************************************************************************
// Static Methods
//
private static Bitmap ImgFilter(Bitmap source, float factor, HSLFilterType type)
{
int
width = source.Width,
height = source.Height;
Rectangle rc = new Rectangle(0, 0, width, height);
if (source.PixelFormat != PixelFormat.Format24bppRgb)
{
source = source.Clone(rc, PixelFormat.Format24bppRgb);
}
Bitmap dest = new Bitmap(width, height, source.PixelFormat);
BitmapData dataSrc = source.LockBits(rc, ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
BitmapData dataDest = dest.LockBits(rc, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int offset = dataSrc.Stride - (width * 3);
unsafe
{
byte *bytesSrc = (byte *)(void *)dataSrc.Scan0;
byte *bytesDest = (byte *)(void *)dataDest.Scan0;
for (int y = 0; y < height; ++y)
{
for (int x = 0; x < width; ++x)
{
HSL hsl = HSL.FromRGB(bytesSrc[2], bytesSrc[1], bytesSrc[0]); // Still BGR (probably due to little-endian byte format.
switch (type)
{
case HSLFilterType.Luminance:
hsl.Luminance *= factor;
break;
case HSLFilterType.Hue:
hsl.Hue *= factor;
break;
case HSLFilterType.Saturation:
hsl.Saturation *= factor;
break;
}
Color c = hsl.RGB;
bytesDest[0] = c.B;
bytesDest[1] = c.G;
bytesDest[2] = c.R;
bytesSrc += 3;
bytesDest += 3;
}
bytesDest += offset;
bytesSrc += offset;
}
source.UnlockBits(dataSrc);
dest.UnlockBits(dataDest);
}
return(dest);
}
//***************************************************************************
// Static Methods
//
public static HSL FromRGB(byte red, byte green, byte blue)
{
return(HSL.FromRGB(Color.FromArgb(red, green, blue)));
}