mirror of https://github.com/GNOME/gimp.git
73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
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/* gimpmath.h
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*
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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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 Library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GIMPMATH_H__
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#define __GIMPMATH_H__
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#include <math.h>
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/* Some portability enhancing stuff. For use both by the gimp app
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* as well as plug-ins and modules.
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*
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* Include this instead of just <math.h>.
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*/
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#ifndef G_PI /* G_PI will be in GLib eventually */
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#define G_PI 3.14159265358979323846
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#endif
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#ifndef G_PI_2 /* As will G_PI_2 */
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#define G_PI_2 1.57079632679489661923
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#endif
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#ifndef G_PI_4 /* As will G_PI_4 */
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#define G_PI_4 0.78539816339744830962
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#endif
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#ifndef G_SQRT2 /* As will G_SQRT2 */
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#define G_SQRT2 1.4142135623730951
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#endif
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/* Use RINT() instead of rint() */
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#ifdef HAVE_RINT
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#define RINT(x) rint(x)
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#else
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#define RINT(x) floor ((x) + 0.5)
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#endif
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#define ROUND(x) ((int) ((x) + 0.5))
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/* Square */
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#define SQR(x) ((x) * (x))
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/* limit a (0->511) int to 255 */
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#define MAX255(a) ((a) | (((a) & 256) - (((a) & 256) >> 8)))
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/* clamp a >>int32<<-range int between 0 and 255 inclusive */
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/* broken! -> #define CLAMP0255(a) ((a & 0xFFFFFF00)? (~(a>>31)) : a) */
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#define CLAMP0255(a) CLAMP(a,0,255)
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GIMPMATH_H__ */
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