libvips/include/vips/inlines.h

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2008-02-28 17:25:47 +01:00
/* Inline maths functions if they are missing from libm
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifndef IM_INLINE_H
#define IM_INLINE_H
/* glib promises to define inline in a portable way */
#include <glib.h>
#ifdef __cplusplus
extern "C" {
#endif /*__cplusplus*/
#ifdef HAVE_HYPOT
#define im__hypot hypot
#else /* HAVE_HYPOT */
static inline double im__hypot( double a, double b ){
double ta= fabs( a );
double tb= fabs( b );
if( ta > tb ){
tb= b / a;
return ta * sqrt( 1.0 + tb * tb );
}
else {
ta= a / b;
return tb * sqrt( 1.0 + ta * ta );
}
}
#endif /* HAVE_HYPOT */
#ifdef __cplusplus
}
#endif /*__cplusplus*/
#endif /*IM_INLINE_H*/