'\" te
.\" Copyright (c) 2007, Sun Microsystems, Inc.  All Rights Reserved 
.TH mlib_ImageAffineTransformIndex 3MLIB "2 Mar 2007" "SunOS 5.11" "mediaLib Library Functions"
.SH NAME
mlib_ImageAffineTransformIndex \- affine transformation on a color indexed image, checking the matrix first
.SH SYNOPSIS
.LP
.nf
cc [ \fIflag\fR... ] \fIfile\fR... \fB-lmlib\fR [ \fIlibrary\fR... ]
#include <mlib.h>

\fBmlib_status\fR \fBmlib_ImageAffineTransformIndex\fR(\fBmlib_image *\fR\fIdst\fR,
     \fBconst mlib_image *\fR\fIsrc\fR, \fBconst mlib_d64 *\fR\fImtx\fR, \fBmlib_filter\fR \fIfilter\fR,
     \fBmlib_edge\fR \fIedge\fR, \fBconst void *\fR\fIcolormap\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBmlib_ImageAffineTransformIndex()\fR function does affine transformation on a color indexed image, checking the matrix first and taking advantage of special cases.
.sp
.LP
The following equation represents the affine transformation:
.sp
.in +2
.nf
xd = a*xs + b*ys + tx
yd = c*xs + d*ys + ty
.fi
.in -2

.sp
.LP
where a point with coordinates \fB(xs, ys)\fR in the source image is mapped to a point with coordinates \fB(xd, yd)\fR in the destination image.
.sp
.LP
The image data type must be \fBMLIB_BYTE\fR or \fBMLIB_SHORT\fR.
.sp
.LP
The width and height of the destination image can be different from the width and height of the source image.
.sp
.LP
The center of the upper-left corner pixel of an image is located at \fB(0.5, 0.5)\fR.
.SH PARAMETERS
.sp
.LP
The function takes the following arguments:
.sp
.ne 2
.mk
.na
\fB\fIdst\fR\fR
.ad
.RS 12n
.rt  
Pointer to destination image.
.RE

.sp
.ne 2
.mk
.na
\fB\fIsrc\fR\fR
.ad
.RS 12n
.rt  
Pointer to source image.
.RE

.sp
.ne 2
.mk
.na
\fB\fImtx\fR\fR
.ad
.RS 12n
.rt  
Transformation matrix. \fBmtx[0]\fR holds \fBa\fR; \fBmtx[1]\fR holds \fBb\fR; \fBmtx[2]\fR holds \fBtx\fR; \fBmtx[3]\fR holds \fBc\fR; \fBmtx[4]\fR holds \fBd\fR; \fBmtx[5]\fR holds \fBty\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fIfilter\fR\fR
.ad
.RS 12n
.rt  
Type of resampling filter. It can be one of the following:
.sp
.in +2
.nf
MLIB_NEAREST
MLIB_BILINEAR
MLIB_BICUBIC
MLIB_BICUBIC2
.fi
.in -2

.RE

.sp
.ne 2
.mk
.na
\fB\fIedge\fR\fR
.ad
.RS 12n
.rt  
Type of edge condition. It can be one of the following:
.sp
.in +2
.nf
MLIB_EDGE_DST_NO_WRITE
MLIB_EDGE_DST_FILL_ZERO
MLIB_EDGE_OP_NEAREST
MLIB_EDGE_SRC_EXTEND
MLIB_EDGE_SRC_PADDED
.fi
.in -2

.RE

.sp
.ne 2
.mk
.na
\fB\fIcolormap\fR\fR
.ad
.RS 12n
.rt  
Internal data structure for inverse color mapping. This data structure is generated by the \fBmlib_ImageColorTrue2IndexInit()\fR function.
.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_ImageAffine\fR(3MLIB), \fBmlib_ImageAffine_Fp\fR(3MLIB), \fBmlib_ImageAffineIndex\fR(3MLIB), \fBmlib_ImageAffineTransform\fR(3MLIB), \fBmlib_ImageAffineTransform_Fp\fR(3MLIB), \fBattributes\fR(5)