mlib_ImageDataTypeConvert(3MLIB) mediaLib Library Functions mlib_ImageDataTypeConvert(3MLIB)
NAME
mlib_ImageDataTypeConvert - data type conversion
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_ImageDataTypeConvert(mlib_image *dst, const mlib_image *src);
DESCRIPTION
The mlib_ImageDataTypeConvert() function converts between data types MLIB_BIT, MLIB_BYTE, MLIB_SHORT, MLIB_USHORT, MLIB_INT, MLIB_FLOAT,
and MLIB_DOUBLE.
The input and output data images must have the same width, height, and number of channels. Conversion to a smaller pixel format clamps the
source value to the dynamic range of the destination pixel.
See the following table for available variations of the data type conversion function.
Source Type Dest. Type Action
MLIB_BYTE MLIB_BIT (x > 0) ? 1 : 0
MLIB_SHORT MLIB_BIT (x > 0) ? 1 : 0
MLIB_USHORT MLIB_BIT (x > 0) ? 1 : 0
MLIB_INT MLIB_BIT (x > 0) ? 1 : 0
MLIB_FLOAT MLIB_BIT (x > 0) ? 1 : 0
MLIB_DOUBLE MLIB_BIT (x > 0) ? 1 : 0
MLIB_BIT MLIB_BYTE (x == 1) ? 1 : 0
MLIB_SHORT MLIB_BYTE (mlib_u8)clamp(x, 0, 255)
MLIB_USHORT MLIB_BYTE (mlib_u8)clamp(x, 0, 255)
MLIB_INT MLIB_BYTE (mlib_u8)clamp(x, 0, 255)
MLIB_FLOAT MLIB_BYTE (mlib_u8)clamp(x, 0, 255)
MLIB_DOUBLE MLIB_BYTE (mlib_u8)clamp(x, 0, 255)
MLIB_BIT MLIB_SHORT (x == 1) ? 1 : 0
MLIB_BYTE MLIB_SHORT (mlib_s16)x
MLIB_USHORT MLIB_SHORT (mlib_s16)clamp(x, -32768, 32767)
MLIB_INT MLIB_SHORT (mlib_s16)clamp(x, -32768, 32767)
MLIB_FLOAT MLIB_SHORT (mlib_s16)clamp(x, -32768, 32767)
MLIB_DOUBLE MLIB_SHORT (mlib_s16)clamp(x, -32768, 32767)
MLIB_BIT MLIB_USHORT (x == 1) ? 1 : 0
MLIB_BYTE MLIB_USHORT (mlib_u16)x
MLIB_SHORT MLIB_USHORT (mlib_u16)clamp(x, 0, 65535)
MLIB_INT MLIB_USHORT (mlib_u16)clamp(x, 0, 65535)
MLIB_FLOAT MLIB_USHORT (mlib_u16)clamp(x, 0, 65535)
MLIB_DOUBLE MLIB_USHORT (mlib_u16)clamp(x, 0, 65535)
MLIB_BIT MLIB_INT (x == 1) ? 1 : 0
MLIB_BYTE MLIB_INT (mlib_s32)x
MLIB_SHORT MLIB_INT (mlib_s32)x
MLIB_USHORT MLIB_INT (mlib_s32)x
MLIB_FLOAT MLIB_INT (mlib_s32)clamp(x, -2147483647-1,
2147483647)
MLIB_DOUBLE MLIB_INT (mlib_s32)clamp(x, -2147483647-1,
2147483647)
MLIB_BIT MLIB_FLOAT (x == 1) ? 1.0 : 0.0
MLIB_BYTE MLIB_FLOAT (mlib_f32)x
MLIB_SHORT MLIB_FLOAT (mlib_f32)x
MLIB_USHORT MLIB_FLOAT (mlib_f32)x
MLIB_INT MLIB_FLOAT (mlib_f32)x
MLIB_DOUBLE MLIB_FLOAT (mlib_f32)x
MLIB_BIT MLIB_DOUBLE (x == 1) ? 1.0 : 0.0
MLIB_BYTE MLIB_DOUBLE (mlib_d64)x
MLIB_SHORT MLIB_DOUBLE (mlib_d64)x
MLIB_USHORT MLIB_DOUBLE (mlib_d64)x
MLIB_INT MLIB_DOUBLE (mlib_d64)x
MLIB_FLOAT MLIB_DOUBLE (mlib_d64)x
The actions are defined in C-style pseudo-code. All type casts follow the rules of standard C. clamp() can be defined as a macro: #define
clamp(x, low, high) (((x) < (low)) ? (low) : (((x) > (high)) ? (high) : (x)))
PARAMETERS
The function takes the following arguments:
dst Pointer to destination image.
src Pointer to source image.
RETURN VALUES
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
mlib_ImageReformat(3MLIB), attributes(5)
SunOS 5.10 9 Nov 2004 mlib_ImageDataTypeConvert(3MLIB)