/// <summary>
/// Initializes a new plan using the provided input and output buffers.
/// These buffers may be overwritten during initialization.
/// </summary>
public static FftwPlanC2C Create(IPinnedArray <Complex> input, IPinnedArray <Complex> output, DftDirection direction, PlannerFlags plannerFlags = PlannerFlags.Default, int nThreads = 1)
{
FftwPlanC2C plan = new FftwPlanC2C(input, output, input.Rank, input.GetSize(), true, direction, plannerFlags, nThreads);
if (plan.IsZero)
{
return(null);
}
return(plan);
}
internal static FftwPlanC2C Create(IPinnedArray <Complex> input, IPinnedArray <Complex> output, int rank, int[] n, DftDirection direction, PlannerFlags plannerFlags, int nThreads)
{
FftwPlanC2C plan = new FftwPlanC2C(input, output, rank, n, false, direction, plannerFlags, nThreads);
if (plan.IsZero)
{
return(null);
}
return(plan);
}
static void Transform(IPinnedArray <Complex> input, IPinnedArray <Complex> output, DftDirection direction, PlannerFlags plannerFlags, int nThreads)
{
if ((plannerFlags & PlannerFlags.Estimate) == PlannerFlags.Estimate)
{
using (var plan = FftwPlanC2C.Create(input, output, direction, plannerFlags, nThreads))
{
plan.Execute();
return;
}
}
using (var plan = FftwPlanC2C.Create(input, output, direction, plannerFlags | PlannerFlags.WisdomOnly, nThreads))
{
if (plan != null)
{
plan.Execute();
return;
}
}
/// If with <see cref="PlannerFlags.WisdomOnly"/> no plan can be created
/// and <see cref="PlannerFlags.Estimate"/> is not specified, we use
/// a different buffer to avoid overwriting the input
if (input != output)
{
using (var plan = FftwPlanC2C.Create(output, output, input.Rank, input.GetSize(), direction, plannerFlags, nThreads))
{
input.CopyTo(output);
plan.Execute();
}
}
else
{
using (var bufferContainer = _bufferPool.RequestBuffer(input.Length * Marshal.SizeOf <Complex>() + MemoryAlignment))
using (var buffer = new AlignedArrayComplex(bufferContainer.Buffer, MemoryAlignment, input.GetSize()))
using (var plan = FftwPlanC2C.Create(buffer, buffer, input.Rank, input.GetSize(), direction, plannerFlags, nThreads))
{
input.CopyTo(plan.Input);
plan.Execute();
plan.Output.CopyTo(output, 0, 0, input.Length);
}
}
}