public bool Set(float gamma)
{
if (_orginalRamp == null && !TrySetDefaultRamp())
{
return(false);
}
if (gamma <= 5 && gamma >= 0)
{
WinApi.RAMP ramp = new WinApi.RAMP();
ramp.Red = new ushort[256];
ramp.Green = new ushort[256];
ramp.Blue = new ushort[256];
for (int i = 1; i < 256; i++)
{
var iArrayValue = Math.Pow((i + 1) / 256.0, gamma) * 65535 + 0.5;
if (iArrayValue > 65535)
{
iArrayValue = 65535;
}
ramp.Red[i] = ramp.Blue[i] = ramp.Green[i] = (ushort)iArrayValue;
}
CurrentGamma = gamma;
return(WinApi.SetDeviceGammaRamp(createdDC, ref ramp));
}
return(false);
}
private bool TrySetDefaultRamp()
{
var ramp = new WinApi.RAMP();
if (!WinApi.GetDeviceGammaRamp(createdDC, ref ramp))
{
return(false);
}
_orginalRamp = ramp;
return(true);
}
