mlib_ImageScale(3MLIB) mediaLib Library Functions mlib_ImageScale(3MLIB)NAMEmlib_ImageScale - linear scaling
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_ImageScale(mlib_image *dst,
const mlib_image *src, const mlib_s32 *alpha, const mlib_s32 *beta,
mlib_s32 shift);
DESCRIPTION
The mlib_ImageScale() function performs a linear scaling on the pixels
of the source image by multiplying the data by a scale factor, shift‐
ing, and then adding an offset.
The following equation is used:
dst[x][y][i] = src[x][y][i] * alpha[i] * 2**(-shift) +
beta[i]
If the result of the operation underflows/overflows the minimum/maximum
value supported by the destination image, then it will be clamped to
the minimum/maximum value respectively.
See the following table for available variations of this linear scaling
function.
Type [*] BYTE SHORT USHORT INT FLOAT DOUBLE
────────────────────────────────────────────────────────────────────────────────────────
MLIB_BYTE Y Y Y Y Y Y
────────────────────────────────────────────────────────────────────────────────────────
MLIB_SHORT Y Y Y Y Y Y
────────────────────────────────────────────────────────────────────────────────────────
MLIB_USHORT Y Y Y Y Y Y
────────────────────────────────────────────────────────────────────────────────────────
MLIB_INT Y Y Y Y Y Y
[*] Each row represents a source data type. Each column represents a
destination data type.
PARAMETERS
The function takes the following arguments:
dst Pointer to destination image.
src Pointer to source image.
alpha Scaling factor. alpha[i] contains the scaling factor for chan‐
nel i.
beta Offset value. beta[i] contains the offset for channel i.
shift Right shifting factor.
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 │Committed │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOmlib_ImageScale_Fp(3MLIB), mlib_ImageScale_Fp_Inp(3MLIB),
mlib_ImageScale_Inp(3MLIB), mlib_ImageScale2(3MLIB),
mlib_ImageScale2_Inp(3MLIB), attributes(5)SunOS 5.10 2 Mar 2007 mlib_ImageScale(3MLIB)