private void UpdatePropertiesIfNeeded(PropertyBasedEffectConfigToken newToken)
{
var whiteBalanceMethod = (WhiteBalanceMethod)newToken.GetProperty <StaticListChoiceProperty>(PropertyNames.WhiteBalanceMethod).Value;
if (_lastSetWhiteBalanceMethod == whiteBalanceMethod)
{
return;
}
UpdateProperties(newToken, whiteBalanceMethod);
_lastSetWhiteBalanceMethod = whiteBalanceMethod;
}
private void UpdateProperties(PropertyBasedEffectConfigToken newToken, WhiteBalanceMethod whiteBalanceMethod)
{
var whiteBalanceFunction = GetWhiteBalanceFunction(whiteBalanceMethod);
if (whiteBalanceFunction == null)
{
return;
}
var(redGain, greenGain, blueGain) = whiteBalanceFunction(SrcArgs.Surface);
(redGain, greenGain, blueGain) = Normalize(redGain, greenGain, blueGain);
newToken.SetPropertyValue(PropertyNames.RedGain, redGain);
newToken.SetPropertyValue(PropertyNames.GreenGain, greenGain);
newToken.SetPropertyValue(PropertyNames.BlueGain, blueGain);
// XXX : How to update controls with new values ?
// This cannot be done with PropertyBasedEffect effects (The so called IndirectUI).
// The solution is to inherit from Effect, and develop the Winform UI manually. (See ScribbleEffect source code)
}
private Func <Surface, (double redGain, double greenGain, double blueGain)> GetWhiteBalanceFunction(WhiteBalanceMethod whiteBalanceMethod)
{
Func <Surface, (double redGain, double greenGain, double blueGain)> function = null;
switch (whiteBalanceMethod)
{
case WhiteBalanceMethod.GrayWorld:
function = GrayWorld;
break;
case WhiteBalanceMethod.Retinex:
function = Retinex;
break;
case WhiteBalanceMethod.YCbCr:
function = YCbCr;
break;
case WhiteBalanceMethod.None:
break;
default:
throw new ArgumentOutOfRangeException();
}
return(function);
}
