## GimpMath

GimpMath — Mathematical definitions and macros.

## Synopsis

```

#define     RINT                            (x)
#define     ROUND                           (x)
#define     SQR                             (x)
#define     MAX255                          (a)
#define     CLAMP0255                       (a)
```

## Description

Mathematical definitions and macros. These macros should be used rather than the ones from math.h for enhanced portability.

## Details

### RINT()

`#define     RINT(x)`

This macro rounds its argument x to an integer value in floating point format.

 x : the value to be rounded.

### ROUND()

```#define ROUND(x) ((int) ((x) + 0.5))
```

This macro rounds its argument x to the nearest integer.

 x : the value to be rounded.

### SQR()

```#define SQR(x) ((x) * (x))
```

This macro squares its argument x.

 x : the value to be squared.

### MAX255()

```#define MAX255(a)  ((a) | (((a) & 256) - (((a) & 256) >> 8)))
```

This macro limits it argument a, an (0-511) int, to 255.

 a : the value to be limited.

### CLAMP0255()

```#define CLAMP0255(a)  CLAMP(a,0,255)
```

This macro clamps its argument a, an int32-range int, between 0 and 255 inclusive.

 a : the value to be clamped.

```#define gimp_deg_to_rad(angle) ((angle) * (2.0 * G_PI) / 360.0)
```

This macro converts its argument angle from degree to radian.

 angle : the angle to be converted.

```#define gimp_rad_to_deg(angle) ((angle) * 360.0 / (2.0 * G_PI))