76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
// Copyright 2004 David Hilvert <dhilvert@auricle.dyndns.org>,
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// <dhilvert@ugcs.caltech.edu>
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/* This file is part of the Anti-Lamenessing Engine.
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The Anti-Lamenessing Engine is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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The Anti-Lamenessing Engine is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the Anti-Lamenessing Engine; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __mult_h__
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#define __mult_h__
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/*
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* A class for pointwise multiplication of filters.
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*/
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class mult : public filter {
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private:
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ale_pos _support;
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filter *f1, *f2;
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public:
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/*
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* Size of filter support, in number of half-cycles to each side of the
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* filter center.
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*/
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virtual ale_pos support() const {
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return _support;
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}
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virtual int equals(const filter *f) const {
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if (typeid(*f) != typeid(*this))
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return 0;
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const mult *m = (const mult *)f;
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/*
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* XXX: if we wished, we could recognize commutativity.
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*/
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return (m->f1->equals(f1)
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&& m->f2->equals(f2));
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}
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/*
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* Response of filter at point p
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*/
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virtual ale_real response(point p) const {
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return f1->response(p) * f2->response(p);
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}
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mult(filter *f1, filter *f2) {
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this->f1 = f1;
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this->f2 = f2;
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assert (f1 != NULL);
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assert (f2 != NULL);
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_support = f1->support();
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if (f2->support() < _support)
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_support = f2->support();
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}
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};
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#endif
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