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- /* LIBGIMP - The GIMP Library
- * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
- *
- * gimpmath.h
- *
- * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
- *
- * 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 2 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, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- */
-
- #ifndef __GIMPMATH_H__
- #define __GIMPMATH_H__
-
- #include <math.h>
-
- #ifdef HAVE_IEEEFP_H
- #include <ieeefp.h>
- #endif
-
- #ifdef G_OS_WIN32
- #include <float.h>
- #endif
-
- #ifdef __cplusplus
- extern "C" {
- #endif /* __cplusplus */
-
-
- /* Some portability enhancing stuff. For use both by the gimp app
- * as well as plug-ins and modules.
- *
- * Include this instead of just <math.h>.
- */
-
- #ifndef G_PI /* G_PI will be in GLib eventually */
- #define G_PI 3.14159265358979323846
- #endif
- #ifndef G_PI_2 /* As will G_PI_2 */
- #define G_PI_2 1.57079632679489661923
- #endif
- #ifndef G_PI_4 /* As will G_PI_4 */
- #define G_PI_4 0.78539816339744830962
- #endif
- #ifndef G_SQRT2 /* As will G_SQRT2 */
- #define G_SQRT2 1.4142135623730951
- #endif
-
- #ifndef RAND_MAX
- #define G_MAXRAND G_MAXINT
- #else
- #define G_MAXRAND RAND_MAX
- #endif
-
- /* Use RINT() instead of rint() */
- #ifdef HAVE_RINT
- #define RINT(x) rint(x)
- #else
- #define RINT(x) floor ((x) + 0.5)
- #endif
-
- #define ROUND(x) ((int) ((x) + 0.5))
-
- /* Square */
- #define SQR(x) ((x) * (x))
-
- /* limit a (0->511) int to 255 */
- #define MAX255(a) ((a) | (((a) & 256) - (((a) & 256) >> 8)))
-
- /* clamp a >>int32<<-range int between 0 and 255 inclusive */
- /* broken! -> #define CLAMP0255(a) ((a & 0xFFFFFF00)? (~(a>>31)) : a) */
- #define CLAMP0255(a) CLAMP(a,0,255)
-
- #define gimp_deg_to_rad(angle) ((angle) * (2.0 * G_PI) / 360.0)
- #define gimp_rad_to_deg(angle) ((angle) * 360.0 / (2.0 * G_PI))
-
- #ifdef HAVE_FINITE
- #define FINITE(x) finite(x)
- #else
- #ifdef HAVE_ISFINITE
- #define FINITE(x) isfinite(x)
- #else
- #ifdef G_OS_WIN32
- #define FINITE(x) _finite(x)
- #else
- #ifdef __EMX__
- #define FINITE(x) isfinite(x)
- #endif /* __EMX__ */
- #endif /* G_OS_WIN32 */
- #endif /* HAVE_ISFINITE */
- #endif /* HAVE_FINITE */
-
- #ifdef __cplusplus
- }
- #endif /* __cplusplus */
-
- #endif /* __GIMPMATH_H__ */
-