michael@0: /*
michael@0:  * Copyright (C) 2011 Google Inc. All rights reserved.
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms, with or without
michael@0:  * modification, are permitted provided that the following conditions
michael@0:  * are met:
michael@0:  *
michael@0:  * 1.  Redistributions of source code must retain the above copyright
michael@0:  *     notice, this list of conditions and the following disclaimer.
michael@0:  * 2.  Redistributions in binary form must reproduce the above copyright
michael@0:  *     notice, this list of conditions and the following disclaimer in the
michael@0:  *     documentation and/or other materials provided with the distribution.
michael@0:  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
michael@0:  *     its contributors may be used to endorse or promote products derived
michael@0:  *     from this software without specific prior written permission.
michael@0:  *
michael@0:  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
michael@0:  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
michael@0:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
michael@0:  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
michael@0:  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
michael@0:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
michael@0:  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
michael@0:  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
michael@0:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
michael@0:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
michael@0:  */
michael@0: 
michael@0: #ifndef ZeroPole_h
michael@0: #define ZeroPole_h
michael@0: 
michael@0: namespace WebCore {
michael@0: 
michael@0: // ZeroPole is a simple filter with one zero and one pole.
michael@0: 
michael@0: class ZeroPole {
michael@0: public:
michael@0:     ZeroPole()
michael@0:         : m_zero(0)
michael@0:         , m_pole(0)
michael@0:         , m_lastX(0)
michael@0:         , m_lastY(0)
michael@0:     {
michael@0:     }
michael@0: 
michael@0:     void process(const float *source, float *destination, int framesToProcess);
michael@0: 
michael@0:     // Reset filter state.
michael@0:     void reset() { m_lastX = 0; m_lastY = 0; }
michael@0:     
michael@0:     void setZero(float zero) { m_zero = zero; }
michael@0:     void setPole(float pole) { m_pole = pole; }
michael@0:     
michael@0:     float zero() const { return m_zero; }
michael@0:     float pole() const { return m_pole; }
michael@0: 
michael@0: private:
michael@0:     float m_zero;
michael@0:     float m_pole;
michael@0:     float m_lastX;
michael@0:     float m_lastY;
michael@0: };
michael@0: 
michael@0: } // namespace WebCore
michael@0: 
michael@0: #endif // ZeroPole_h