mlib_imagedivalpha_inp(3mlib) [sunos man page]

mlib_ImageDivAlpha_Inp(3MLIB)				    mediaLib Library Functions				     mlib_ImageDivAlpha_Inp(3MLIB)

NAME

       mlib_ImageDivAlpha_Inp - alpha channel division, in place

SYNOPSIS

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

       mlib_status mlib_ImageDivAlpha_Inp(mlib_image *srcdst, mlib_s32 cmask);

DESCRIPTION

       The mlib_ImageDivAlpha_Inp() function divides 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.

       In the case of srcdst[x][y][a] = 0,

       srcdst[x][y][c] = 0		if srcdst[x][y][c] = 0
       srcdst[x][y][c] = DATA_TYPE_MAX	if srcdst[x][y][c] > 0
       srcdst[x][y][c] = DATA_TYPE_MIN	if srcdst[x][y][c] < 0

       where  DATA_TYPE  is MLIB_U8, MLIB_S16, MLIB_U16, or MLIB_S32 for an image of type MLIB_BYTE, MLIB_SHORT, MLIB_USHORT, or MLIB_INT, respec-
       tively.

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			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_ImageDivAlpha(3MLIB), mlib_ImageDivAlpha_Fp(3MLIB), mlib_ImageDivAlpha_Fp_Inp(3MLIB), attributes(5)

SunOS 5.10							    10 Nov 2004 				     mlib_ImageDivAlpha_Inp(3MLIB)

Check Out this Related Man Page

mlib_ImageDivConstShift_Inp(3MLIB)			    mediaLib Library Functions				mlib_ImageDivConstShift_Inp(3MLIB)

NAME

       mlib_ImageDivConstShift_Inp - division by a constant, with shifting

SYNOPSIS

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

       mlib_status mlib_ImageDivConstShift_Inp(mlib_image *srcdst, const mlib_s32 *c, mlib_s32 shift);

DESCRIPTION

       The  mlib_ImageDivConstShift_Inp()  function  divides  each  pixel  in an image by a constant value on a pixel-by-pixel basis, in place. It
       scales the result by a left shift and writes the result to the image on a pixel-by-pixel basis.

       It uses the following equation:

       srcdst[x][y][i] = srcdst[x][y][i] / c[i] * 2**shift

       In the case of c[i] = 0,

       srcdst[x][y][i] = 0		if srcdst[x][y][i] = 0
       srcdst[x][y][i] = DATA_TYPE_MAX	if srcdst[x][y][i] > 0
       srcdst[x][y][i] = DATA_TYPE_MIN	if srcdst[x][y][i] < 0

       where DATA_TYPE is MLIB_U8, MLIB_S16, MLIB_U16, or MLIB_S32 for an image of type MLIB_BYTE, MLIB_SHORT, MLIB_USHORT, or	MLIB_INT,  respec-
       tively.

PARAMETERS

       The function takes the following arguments:

       srcdst	       Pointer to source and destination image.

       c	       Constant by which each pixel is divided. c[i] contains the constant for channel i.

       shift	       Left shifting factor.  0 <= shift <= 31.

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_ImageDivConstShift(3MLIB), attributes(5)

SunOS 5.10							    10 Nov 2004 				mlib_ImageDivConstShift_Inp(3MLIB)

Linux and UNIX Man Pages

mlib_imagedivalpha_inp(3mlib) [sunos man page]

Check Out this Related Man Page