protected unsafe void Apply(int *input, int *output, int width, int height, Int32Rect area, int hue,
float saturation, float lightness)
{
int startX = area.X;
int startY = area.Y;
int endX = area.X + area.Width;
int endY = area.Y + area.Height;
lightness = lightness / 100.0F;
saturation = saturation / 100.0F;
Parallel.For(0, height, (y) =>
{
for (int x = 0; x < width; ++x)
{
if (x >= startX && x < endX && y >= startY && y < endY)
{
int argb = input[y * width + x];
byte r = (byte)(argb >> 16);
byte g = (byte)(argb >> 8);
byte b = (byte)(argb);
int h;
float s;
float l;
ColorEx.ToHSL(r, g, b, out h, out s, out l);
h = (h + hue) % 360;
s = (s + saturation).Clamp(0.0F, 1.0F);
l = (l + lightness).Clamp(0.0F, 1.0F);
ColorEx.ToRgb(h, s, l, out r, out g, out b);
output[y * width + x] = (argb & -0x1000000) | (r << 16) | (g << 8) | (b);
}
else
{
output[y * width + x] = input[y * width + x];
}
}
});
}