public static Pix Pivot(Pix pix, float angle, RotationMethod method = RotationMethod.AreaMap, RotationFill fillColor = RotationFill.White, int?w = null, int?h = null)
{
w = w.IsNullOrEmpty() ? pix.Width : w;
h = h.IsNullOrEmpty() ? pix.Height : h;
if (Math.Abs(angle) < TinyAngle)
{
return(pix.Clone());
}
IntPtr p;
double rotations = 2 * angle / Math.PI;
if (Math.Abs(rotations - Math.Floor(rotations)) < TinyAngle)
{
p = LeptonicaNativeApi.Native.pixRotateOrth(pix.Reference, (int)rotations);
}
else
{
p = LeptonicaNativeApi.Native.pixRotate(pix.Reference, angle, method, fillColor, w.Value, h.Value);
}
if (p == IntPtr.Zero)
{
throw new NullReferenceException("failed to rotate");
}
return(Pix.Create(p));
}