mediaLib Library Functions          mlibImageMulAlphaInp(3MLIB)



NAME
     mlibImageMulAlphaInp - alpha  channel  multiplication,  in
     place

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

     mlibstatus mlibImageMulAlphaInp(mlibimage *srcdst, mlibs32 cmask);


DESCRIPTION
     The mlibImageMulAlphaInp() function multiplies color chan-
     nels  by  the  alpha  channel  on a pixel by pixel basis, in
     place.


     For the MLIBYTE image, it uses the following equation:

       srcdst[x][y][c] = srcdst[x][y][c] * srcdst[x][y][a] * 2**(-8)



     For the MLIBSHORT image, it uses the following equation:

       srcdst[x][y][c] = srcdst[x][y][c] * srcdst[x][y][a] * 2**(-15)



     For the MLIBUSHORT image, it uses the following equation:

       srcdst[x][y][c] = srcdst[x][y][c] * srcdst[x][y][a] * 2**(-16)



     For the MLIBINT 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.



SunOS 5.11           Last change: 2 Mar 2007                    1






mediaLib Library Functions          mlibImageMulAlphaInp(3MLIB)



               The channel corresponding to the 1 bit of cmask is
               the alpha channel.


RETURN VALUES
     The function returns MLIBSUCES if  successful.  Otherwise
     it returns MLIBFAILURE.

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Committed                   
    
     MT-Level                     MT-Safe                     
    


SEE ALSO
     mlibImageMulAlpha(3MLIB),     mlibImageMulAlphaFp(3MLIB),
     mlibImageMulAlphaFpInp(3MLIB), attributes(5)





























SunOS 5.11           Last change: 2 Mar 2007                    2