'\" te
.\" Copyright (c) 2007, Sun Microsystems, Inc.  All Rights Reserved 
.TH mlib_ImageScalarBlend_Fp 3MLIB "2 Mar 2007" "SunOS 5.11" "mediaLib Library Functions"
.SH NAME
mlib_ImageScalarBlend_Fp \- image blending with scalar
.SH SYNOPSIS
.LP
.nf
cc [ \fIflag\fR... ] \fIfile\fR... \fB-lmlib\fR [ \fIlibrary\fR... ]
#include <mlib.h>

\fBmlib_status\fR \fBmlib_ImageScalarBlend_Fp\fR(\fBmlib_image *\fR\fIdst\fR,
     \fBconst mlib_image *\fR\fIsrc1\fR, \fBconst mlib_image *\fR\fIsrc2\fR, \fBconst mlib_d64 *\fR\fIalpha\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBmlib_ImageScalarBlend_Fp()\fR function blends the first and second floating-point source images by adding each of their scaled pixels. The first source image is scaled by the scalar \fBa\fR, and the second source image is inverse scaled by \fB(1 - a)\fR.
.sp
.LP
It uses the following equation:
.sp
.in +2
.nf
dst[x][y][i] = a[i]*src1[x][y][i] + (1 - a[i])*src2[x][y][i]
.fi
.in -2

.SH PARAMETERS
.sp
.LP
The function takes the following arguments:
.sp
.ne 2
.mk
.na
\fB\fIdst\fR\fR
.ad
.RS 9n
.rt  
Pointer to destination image.
.RE

.sp
.ne 2
.mk
.na
\fB\fIsrc1\fR\fR
.ad
.RS 9n
.rt  
Pointer to first source image.
.RE

.sp
.ne 2
.mk
.na
\fB\fIsrc2\fR\fR
.ad
.RS 9n
.rt  
Pointer to second source image.
.RE

.sp
.ne 2
.mk
.na
\fB\fIalpha\fR\fR
.ad
.RS 9n
.rt  
Scalar blending factor. The \fBa\fR value equals \fBalpha\fR which should be in the \fB[0.0, 1.0]\fR range. \fBalpha[i]\fR contains the blending factor for channel \fBi\fR.
.RE

.SH RETURN VALUES
.sp
.LP
The function returns \fBMLIB_SUCCESS\fR if successful. Otherwise it returns \fBMLIB_FAILURE\fR.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityCommitted
_
MT-LevelMT-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBmlib_ImageScalarBlend\fR(3MLIB), \fBmlib_ImageScalarBlend_Fp_Inp\fR(3MLIB), \fBmlib_ImageScalarBlend_Inp\fR(3MLIB), \fBattributes\fR(5)