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ec24687ce4
Adding @defgroup and @ingroup doxygen tags into all headers in the common folder that contain doxygen blocks. This improves the structure, readability, and findability of information in the resulting output. This commit targets purely structure and does not deal with the content of the currently existing doxygen documentation.
64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef COMMON_FRAC_H
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#define COMMON_FRAC_H
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#include "common/scummsys.h"
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/**
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* @defgroup common_frac Fixed-point fractions
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* @ingroup common
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*
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* @brief API for fixed-point fractions.
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*
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* @{
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*/
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/**
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* The precision of the fractional (fixed point) type we define below.
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* Normally you should never have to modify this value.
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*/
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enum {
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FRAC_BITS = 16,
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FRAC_LO_MASK = ((1L << FRAC_BITS) - 1),
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FRAC_HI_MASK = ((1L << FRAC_BITS) - 1) << FRAC_BITS,
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FRAC_ONE = (1L << FRAC_BITS), // 1.0
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FRAC_HALF = (1L << (FRAC_BITS-1)) // 0.5
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};
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/**
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* Fixed-point fractions, used by the sound rate converter and other code.
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*/
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typedef int32 frac_t;
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inline frac_t doubleToFrac(double value) { return (frac_t)(value * FRAC_ONE); }
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inline double fracToDouble(frac_t value) { return ((double)value) / FRAC_ONE; }
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inline frac_t intToFrac(int16 value) { return value * (1 << FRAC_BITS); }
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inline int16 fracToInt(frac_t value) { return value / (1 << FRAC_BITS); }
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/** @} */
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#endif
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