mediaLib Library Functions         mlibImageBlend2FpInp(3MLIB)



NAME
     mlibImageBlend2FpInp - blend with an alpha image

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

     mlibstatus mlibImageBlend2FpInp(mlibimage *src2dst,
          const mlibimage *src1, const mlibimage *alpha);


DESCRIPTION
     The mlibImageBlend2FpInp()  function  blends  two  images
     together, in place, on a pixel-by-pixel basis using an alpha
     image, when a is also on a pixel basis. The alpha image  can
     be  a  single-channel image or have the same number of chan-
     nels as the source and destination images.


     It uses the following equation when the  alpha  image  is  a
     single-channel image:

       src2dst[x][y][i] = alpha[x][y][0]*src1[x][y][i] ]
                          (1 - alpha[x][y][0])*src2dst[x][y][i]



     It uses the following equation when the alpha image has  the
     same  number  of  channels  as  the  source  and destination
     images:

       src2dst[x][y][i] = alpha[x][y][i]*src1[x][y][i] ]
                          (1 - alpha[x][y][i])*src2dst[x][y][i]



     It uses the following equation:




PARAMETERS
     The function takes the following arguments:

     src2dst    Pointer to second source and destination image.


     src1       Pointer to first source image.


     alpha      Alpha image used to control blending. The  pixels
                in  this image should have values in the range of



SunOS 5.11           Last change: 2 Mar 2007                    1






mediaLib Library Functions         mlibImageBlend2FpInp(3MLIB)



                [0.0, 1.0].


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
     mlibImageBlend(3MLIB),           mlibImageBlendFp(3MLIB),
     mlibImageBlend1FpInp(3MLIB), mlibImageBlend1Inp(3MLIB),
     mlibImageBlend2Inp(3MLIB), attributes(5)





























SunOS 5.11           Last change: 2 Mar 2007                    2