/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 */

#ifndef ZeroPole_h
#define ZeroPole_h

namespace WebCore {

// ZeroPole is a simple filter with one zero and one pole.

class ZeroPole {
 public:
  ZeroPole() : m_zero(0), m_pole(0), m_lastX(0), m_lastY(0) {}

  void process(const float* source, float* destination, int framesToProcess);

  // Reset filter state.
  void reset() {
    m_lastX = 0;
    m_lastY = 0;
  }

  void setZero(float zero) { m_zero = zero; }
  void setPole(float pole) { m_pole = pole; }

  float zero() const { return m_zero; }
  float pole() const { return m_pole; }

 private:
  float m_zero;
  float m_pole;
  float m_lastX;
  float m_lastY;
};

}  // namespace WebCore

#endif  // ZeroPole_h