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## GimpMath

GimpMath — Mathematical definitions and macros.

## Functions

 #define RINT() #define ROUND() #define SIGNED_ROUND() #define SQR() #define MAX255() #define CLAMP0255() #define SAFE_CLAMP() #define gimp_deg_to_rad() #define gimp_rad_to_deg()

## Description

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.

## Functions

### RINT()

```#define RINT(x) rint(x)
```

This macro rounds its argument `x` to an integer value in floating point format. Use `RINT()` instead of `rint()`.

#### Parameters

 x the value to be rounded

### ROUND()

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

This macro rounds its positive argument `x` to the nearest integer.

#### Parameters

 x the value to be rounded.

### SIGNED_ROUND()

```#define SIGNED_ROUND(x) ((int) RINT (x))
```

This macro rounds its argument `x` to the nearest integer.

#### Parameters

 x the value to be rounded.

### SQR()

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

This macro squares its argument `x` .

#### Parameters

 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.

#### Parameters

 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.

#### Parameters

 a the value to be clamped.

### SAFE_CLAMP()

```#define SAFE_CLAMP(x, low, high)  ((x) > (low) ? (x) < (high) ? (x) : (high) : (low))
```

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.

#### Parameters

 x the value to be limited. low the lower limit. high the upper limit.

Since: 2.10

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

This macro converts its argument `angle` from degree to radian.

#### Parameters

 angle the angle to be converted.

```#define gimp_rad_to_deg(angle) ((angle) * 360.0 / (2.0 * G_PI))
This macro converts its argument `angle` from radian to degree.
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