Manual Pages for UNIX Operating System command usage for man mlib_ImageDivAlpha_Inp

mediaLib Library Functions          mlib_ImageDivAlpha_Inp(3MLIB)



NAME
     mlib_ImageDivAlpha_Inp - alpha channel division, in place

SYNOPSIS
     cc [ flag... ] file... -lmlib [ library... ]
     #include 

     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







SunOS 5.11           Last change: 2 Mar 2007                    1






mediaLib Library Functions          mlib_ImageDivAlpha_Inp(3MLIB)



     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, respectively.

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  attri-
     butes:



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|
    | MT-Level                    | MT-Safe                     |
    |_____________________________|_____________________________|


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

















SunOS 5.11           Last change: 2 Mar 2007                    2