Content-type: text/html Man page of mlib_ImageBlendMulti

mlib_ImageBlendMulti

Section: mediaLib Library Functions (3MLIB)
Updated: 2 Mar 2007
Index Return to Main Contents
 

NAME

mlib_ImageBlendMulti - blend multiple images  

SYNOPSIS

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

mlib_status mlib_ImageBlendMulti(mlib_image *dst, const mlib_image **srcs,
    const mlib_image **alphas, const mlib_s32 *c, mlib_s32 n);

 

DESCRIPTION

The mlib_ImageBlendMulti() function blends multiple source images, using multiple alpha images, into a single destination image.

All images involved should have the same data type and same size and the source and destination images should have the same number of channels. The alpha images should have either 1 channel or the same number of channels as the sources and destination. A single-channel alpha image would be applied to all channels of the corresponding source image. Single and multi-channel alpha images can be mixed in the same invocation.

It uses the following equation:

                n-1
               SUM {alphas[k][x][y][j] * srcs[k][x][y][i]}
               k=0
dst[x][y][i] = ---------------------------------------------
               n-1
               SUM {alphas[k][x][y][j]}
               k=0

or

                          n-1
dst[x][y][i] = c[i]    if SUM {alphas[k][x][y][j]} = 0
                         k=0

where j = i for multi-channel alpha images; j = 0 for signle-channel alpha images.  

PARAMETERS

The function takes the following arguments:

dst

Pointer to destination image.

srcs

Pointer to an array of source images.

alphas

Pointer to an array of alpha images.

c

Background color.

n

Number of source images to be blended.

 

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 TYPEATTRIBUTE VALUE

Interface StabilityCommitted

MT-Level

 

SEE ALSO

mlib_ImageBlendMulti_Fp(3MLIB), mlib_ImageBlend(3MLIB), mlib_ImageBlend_Fp(3MLIB), attributes(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
PARAMETERS
RETURN VALUES
ATTRIBUTES
SEE ALSO

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Time: 02:38:08 GMT, October 02, 2010