mirror of https://github.com/GNOME/gimp.git
134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* gimpmath.h
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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 3 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
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* <http://www.gnu.org/licenses/>.
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*/
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#ifndef __GIMP_MATH_H__
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#define __GIMP_MATH_H__
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#include <math.h>
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#ifdef HAVE_IEEEFP_H
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#include <ieeefp.h>
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#endif
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#ifdef G_OS_WIN32
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#include <float.h>
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#endif
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#define __GIMP_MATH_H_INSIDE__
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#include <libgimpmath/gimpmathtypes.h>
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#include <libgimpmath/gimpmatrix.h>
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#include <libgimpmath/gimpmd5.h>
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#include <libgimpmath/gimpvector.h>
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#undef __GIMP_MATH_H_INSIDE__
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G_BEGIN_DECLS
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/**
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* SECTION: gimpmath
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* @title: GimpMath
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* @short_description: Mathematical definitions and macros.
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*
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* Mathematical definitions and macros for use both by the GIMP
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* application and plug-ins. These macros should be used rather than
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* the ones from <math.h> for enhanced portability.
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**/
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/**
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* RINT:
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* @x: the value to be rounded
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*
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* This macro rounds its argument @x to an integer value in floating
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* point format. Use RINT() instead of rint().
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**/
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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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/**
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* ROUND:
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* @x: the value to be rounded.
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*
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* This macro rounds its positive argument @x to the nearest integer.
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**/
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#define ROUND(x) ((int) ((x) + 0.5))
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/**
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* SIGNED_ROUND:
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* @x: the value to be rounded.
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*
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* This macro rounds its argument @x to the nearest integer.
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**/
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#define SIGNED_ROUND(x) ((int) ((((x) < 0) ? (x) - 0.5 : (x) + 0.5)))
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/**
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* SQR:
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* @x: the value to be squared.
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*
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* This macro squares its argument @x.
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**/
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#define SQR(x) ((x) * (x))
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/**
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* MAX255:
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* @a: the value to be limited.
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*
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* This macro limits it argument @a, an (0-511) int, to 255.
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**/
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#define MAX255(a) ((a) | (((a) & 256) - (((a) & 256) >> 8)))
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/**
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* CLAMP0255:
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* @a: the value to be clamped.
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*
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* This macro clamps its argument @a, an int32-range int, between 0
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* and 255 inclusive.
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**/
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#define CLAMP0255(a) CLAMP(a,0,255)
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/**
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* gimp_deg_to_rad:
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* @angle: the angle to be converted.
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*
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* This macro converts its argument @angle from degree to radian.
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**/
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#define gimp_deg_to_rad(angle) ((angle) * (2.0 * G_PI) / 360.0)
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/**
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* gimp_rad_to_deg:
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* @angle: the angle to be converted.
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*
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* This macro converts its argument @angle from radian to degree.
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**/
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#define gimp_rad_to_deg(angle) ((angle) * 360.0 / (2.0 * G_PI))
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G_END_DECLS
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#endif /* __GIMP_MATH_H__ */
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