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| -rw-r--r-- | libgimpmath/gimpmath.h | 153 |
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diff --git a/libgimpmath/gimpmath.h b/libgimpmath/gimpmath.h new file mode 100644 index 0000000..c20b16f --- /dev/null +++ b/libgimpmath/gimpmath.h @@ -0,0 +1,153 @@ +/* LIBGIMP - The GIMP Library + * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball + * + * gimpmath.h + * + * This library 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 3 of the License, or (at your option) any later version. + * + * This library 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 library. If not, see + * <https://www.gnu.org/licenses/>. + */ + +#ifndef __GIMP_MATH_H__ +#define __GIMP_MATH_H__ + + +#include <math.h> + +#ifdef HAVE_IEEEFP_H +#include <ieeefp.h> +#endif + +#ifdef G_OS_WIN32 +#include <float.h> +#endif + +#define __GIMP_MATH_H_INSIDE__ + +#include <libgimpmath/gimpmathtypes.h> + +#include <libgimpmath/gimpmatrix.h> +#include <libgimpmath/gimpmd5.h> +#include <libgimpmath/gimpvector.h> + +#undef __GIMP_MATH_H_INSIDE__ + + +G_BEGIN_DECLS + + +/** + * SECTION: gimpmath + * @title: GimpMath + * @short_description: Mathematical definitions and macros. + * + * Mathematical definitions and macros for use both by the GIMP + * application and plug-ins. These macros should be used rather than + * the ones from <math.h> for enhanced portability. + **/ + + +/** + * RINT: + * @x: the value to be rounded + * + * This macro rounds its argument @x to an integer value in floating + * point format. Use RINT() instead of rint(). + **/ +#if defined (HAVE_RINT) && 0 +/* note: rint() depends on the current floating-point rounding mode. when the + * rounding mode is FE_TONEAREST, it, in parctice, breaks ties to even. this + * is different from 'floor (x + 0.5)', which breaks ties up. in other words + * 'rint (2.5) == 2.0', while 'floor (2.5 + 0.5) == 3.0'. this is asking for + * trouble, so let's just use the latter. + */ +#define RINT(x) rint(x) +#else +#define RINT(x) floor ((x) + 0.5) +#endif + +/** + * ROUND: + * @x: the value to be rounded. + * + * This macro rounds its positive argument @x to the nearest integer. + **/ +#define ROUND(x) ((int) ((x) + 0.5)) + +/** + * SIGNED_ROUND: + * @x: the value to be rounded. + * + * This macro rounds its argument @x to the nearest integer. + **/ +#define SIGNED_ROUND(x) ((int) RINT (x)) + +/** + * SQR: + * @x: the value to be squared. + * + * This macro squares its argument @x. + **/ +#define SQR(x) ((x) * (x)) + +/** + * MAX255: + * @a: the value to be limited. + * + * This macro limits it argument @a, an (0-511) int, to 255. + **/ +#define MAX255(a) ((a) | (((a) & 256) - (((a) & 256) >> 8))) + +/** + * CLAMP0255: + * @a: the value to be clamped. + * + * This macro clamps its argument @a, an int32-range int, between 0 + * and 255 inclusive. + **/ +#define CLAMP0255(a) CLAMP(a,0,255) + +/** + * SAFE_CLAMP: + * @x: the value to be limited. + * @low: the lower limit. + * @high: the upper limit. + * + * Ensures that @x is between the limits set by @low and @high, + * even if @x is NaN. If @low is greater than @high, or if either + * of them is NaN, the result is undefined. + * + * Since: 2.10 + **/ +#define SAFE_CLAMP(x, low, high) ((x) > (low) ? (x) < (high) ? (x) : (high) : (low)) + +/** + * gimp_deg_to_rad: + * @angle: the angle to be converted. + * + * This macro converts its argument @angle from degree to radian. + **/ +#define gimp_deg_to_rad(angle) ((angle) * (2.0 * G_PI) / 360.0) + +/** + * gimp_rad_to_deg: + * @angle: the angle to be converted. + * + * This macro converts its argument @angle from radian to degree. + **/ +#define gimp_rad_to_deg(angle) ((angle) * 360.0 / (2.0 * G_PI)) + + +G_END_DECLS + +#endif /* __GIMP_MATH_H__ */ |