Manual Pages for UNIX Operating System command usage for man mlib_ImageMulAlpha

mediaLib Library Functions              mlib_ImageMulAlpha(3MLIB)



NAME
     mlib_ImageMulAlpha - alpha channel multiplication

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

     mlib_status mlib_ImageMulAlpha(mlib_image *dst, const mlib_image *src,
          mlib_s32 cmask);


DESCRIPTION
     The mlib_ImageMulAlpha() function multiplies color  channels
     by the alpha channel on a pixel by pixel basis.


     For the MLIB_BYTE image, it uses the following equation:

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



     For the MLIB_SHORT image, it uses the following equation:

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



     For the MLIB_USHORT image, it uses the following equation:

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



     For the MLIB_INT image, it uses the following equation:

       dst[x][y][c] = src[x][y][c] * src[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:

     dst      Pointer to destination image.


     src      Pointer to source image.





SunOS 5.11           Last change: 2 Mar 2007                    1






mediaLib Library Functions              mlib_ImageMulAlpha(3MLIB)



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



























SunOS 5.11           Last change: 2 Mar 2007                    2