723e50990f
Check for trunc() during configure and provide a fallback implementation for it if it is not found.
117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2011 Chun-wei Fan <fanc999@yahoo.com.tw>
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*
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* Author: Chun-wei Fan <fanc999@yahoo.com.tw>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <math.h>
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/* Workaround for round() for non-GCC/non-C99 compilers */
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#ifndef HAVE_ROUND
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static inline double
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round (double x)
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{
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if (x >= 0)
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return floor (x + 0.5);
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else
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return ceil (x - 0.5);
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}
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#endif
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/* Workaround for rint() for non-GCC/non-C99 compilers */
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#ifndef HAVE_RINT
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static inline double
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rint (double x)
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{
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if (ceil (x + 0.5) == floor (x + 0.5))
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{
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int a;
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a = (int) ceil (x);
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if (a % 2 == 0)
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return ceil (x);
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else
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return floor (x);
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}
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else
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{
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if (x >= 0)
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return floor (x + 0.5);
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else
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return ceil (x - 0.5);
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}
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}
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#endif
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#ifndef HAVE_NEARBYINT
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/* Workaround for nearbyint() for non-GCC/non-C99 compilers */
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/* This is quite similar to rint() in most respects */
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static inline double
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nearbyint (double x)
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{
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return floor (x + 0.5);
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}
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#endif
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#ifndef HAVE_DECL_ISINF
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/* Unfortunately MSVC does not have finite()
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* but it does have _finite() which is the same
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* as finite() except when x is a NaN
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*/
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static inline gboolean
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isinf (double x)
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{
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return (!_finite (x) && !_isnan (x));
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}
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#endif
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#ifndef INFINITY
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/* define INFINITY for compilers that lack support for it */
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# ifdef HUGE_VALF
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# define INFINITY HUGE_VALF
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# else
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# define INFINITY (float)HUGE_VAL
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# endif
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#endif
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#ifndef HAVE_LOG2
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/* Use a simple implementation for log2() for compilers that lack it */
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static inline double
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log2 (double x)
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{
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return log (x) / log (2.0);
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}
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#endif
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#ifndef HAVE_EXP2
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/* Use a simple implementation for exp2() for compilers that lack it */
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static inline double
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exp2 (double x)
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{
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return pow (2.0, x);
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}
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#endif
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#ifndef HAVE_TRUNC
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static inline double
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trunc (double x)
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{
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return (x > 0 ? floor (x) : ceil (x));
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}
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#endif
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