# mlib_imagemulalpha_inp(3mlib) [sunos man page]

```mlib_ImageMulAlpha_Inp(3MLIB)				    mediaLib Library Functions				     mlib_ImageMulAlpha_Inp(3MLIB)

NAME
mlib_ImageMulAlpha_Inp - alpha channel multiplication, in place

SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>

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 correspond-
ing 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	     |Evolving			   |
+-----------------------------+-----------------------------+
|MT-Level		     |MT-Safe			   |
+-----------------------------+-----------------------------+

mlib_ImageMulAlpha(3MLIB), mlib_ImageMulAlpha_Fp(3MLIB), mlib_ImageMulAlpha_Fp_Inp(3MLIB), attributes(5)

SunOS 5.10							    10 Nov 2004 				     mlib_ImageMulAlpha_Inp(3MLIB)```

## Check Out this Related Man Page

```mlib_ImageMulAlpha_Inp(3MLIB)				    mediaLib Library Functions				     mlib_ImageMulAlpha_Inp(3MLIB)

NAME
mlib_ImageMulAlpha_Inp - alpha channel multiplication, in place

SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>

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 corresponding 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			   |
+-----------------------------+-----------------------------+