mlib_ImageMulAlpha_Inp(3MLmediaLib Library Functimlib_ImageMulAlpha_Inp(3MLIB)NAMEmlib_ImageMulAlpha_Inp - alpha channel multiplication, in place
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_ImageMulAlpha_Inp(mlib_image *srcdst, mlib_s32 cmask);
DESCRIPTION
The mlib_ImageMulAlpha_Inp() function multiplies color channels by the
alpha channel on a pixel by pixel basis, in place.
For the MLIB_BYTE image, it uses the following equation:
srcdst[x][y][c] = srcdst[x][y][c] * srcdst[x][y][a] * 2**(-8)
For the MLIB_SHORT image, it uses the following equation:
srcdst[x][y][c] = srcdst[x][y][c] * srcdst[x][y][a] * 2**(-15)
For the MLIB_USHORT image, it uses the following equation:
srcdst[x][y][c] = srcdst[x][y][c] * srcdst[x][y][a] * 2**(-16)
For the MLIB_INT image, it uses the following equation:
srcdst[x][y][c] = srcdst[x][y][c] * srcdst[x][y][a] * 2**(-31)
where c and a are the indices for the color channels and the alpha
channel, respectively, so c != a.
PARAMETERS
The function takes the following arguments:
srcdst Pointer to source and destination image.
cmask Channel mask to indicate the alpha channel. Each bit of the
mask represents a channel in the image. The channel corre‐
sponding to the 1 bit of cmask is the alpha channel.
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_ImageMulAlpha(3MLIB), mlib_ImageMulAlpha_Fp(3MLIB), mlib_ImageMu‐
lAlpha_Fp_Inp(3MLIB), attributes(5)SunOS 5.10 2 Mar 2007 mlib_ImageMulAlpha_Inp(3MLIB)
