private (double redGain, double greenGain, double blueGain) YCbCr(Surface src)
{
var maxY = 0.0;
var redAccumulator = 0.0;
var greenAccumulator = 0.0;
var blueAccumulator = 0.0;
for (var x = 0; x < src.Width; x++)
{
for (var y = 0; y < src.Height; y++)
{
var rgbColor = src[x, y];
var ycbcrColor = YCbCrColor.FromRgb(rgbColor);
maxY = Math.Max(maxY, ycbcrColor.Y);
redAccumulator += rgbColor.R;
greenAccumulator += rgbColor.G;
blueAccumulator += rgbColor.B;
}
}
var pixelCount = src.Width * src.Height;
var redAverage = redAccumulator / pixelCount;
var greenAverage = greenAccumulator / pixelCount;
var blueAverage = blueAccumulator / pixelCount;
return(maxY / redAverage, maxY / greenAverage, maxY / blueAverage);
}
private void Render(Surface dst, Surface src, Rectangle rect)
{
for (int x = rect.Left; x < rect.Right; x++)
{
for (int y = rect.Top; y < rect.Bottom; y++)
{
if (src.IsVisible(x, y))
{
YCbCrColor color = YCbCrColor.FromRgb(src[x, y]);
color.Cb = _selectedColor.Cb;
color.Cr = _selectedColor.Cr;
dst[x, y] = color.ToRgb();
}
}
}
}
private static YCbCrColor[][] ToYCbCr(Surface source)
{
YCbCrColor[][] picture = new YCbCrColor[source.Width][];
for (int x = 0; x < picture.Length; x++)
{
picture[x] = new YCbCrColor[source.Height];
}
for (int x = 0; x < picture.Length; x++)
{
for (int y = 0; y < picture[x].Length; y++)
{
picture[x][y] = YCbCrColor.FromRgb(source[x, y]);
}
}
return(picture);
}
/// <summary>
/// Sets global effect parameters.
/// </summary>
/// <param name="parameters">The parameters.</param>
/// <param name="dstArgs">The destination picture arguments.</param>
/// <param name="srcArgs">The source picture arguments.</param>
protected override void OnSetRenderInfo(PropertyBasedEffectConfigToken parameters, RenderArgs dstArgs, RenderArgs srcArgs)
{
int color = parameters.GetProperty <Int32Property>("Color").Value;
_selectedColor = YCbCrColor.FromRgb(ColorBgra.FromUInt32((UInt32)color));
}