125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/* @(#) im_similarity_area() ... similarity transform. Like affine, but
|
|
* @(#) rotate/scale only.
|
|
* @(#)
|
|
* @(#) int im_similarity_area(in, out, a, b, dx, dy, w, h, x, y)
|
|
* @(#) IMAGE *in, *out;
|
|
* @(#) double a, b, dx, dy;
|
|
* @(#) int w, h, x, y;
|
|
* @(#)
|
|
* @(#) Forward transform
|
|
* @(#) X = a * x - b * y + dx
|
|
* @(#) Y = b * x + a * y + dy
|
|
* @(#)
|
|
* @(#) x and y are the coordinates in input image.
|
|
* @(#) X and Y are the coordinates in output image.
|
|
* @(#) (0,0) is the upper left corner.
|
|
* @(#)
|
|
* @(#) a and b DO NOT correspond to scale and angle directly
|
|
* @(#)
|
|
* @(#) scale = sqrt(a*a + b*b) , angle = arctan(a/b)
|
|
* @(#)
|
|
* @(#) im_similarity_area() returns 0 on success and -1 on error
|
|
* @(#)
|
|
*
|
|
* 3/3/98 JC
|
|
* - redone as wrapper for im_affine(), compatibility only
|
|
* 8/4/04
|
|
* - transform rounding redone as part of the new im_embed thing
|
|
*/
|
|
|
|
/*
|
|
|
|
This file is part of VIPS.
|
|
|
|
VIPS is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
*/
|
|
|
|
/*
|
|
|
|
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
|
|
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif /*HAVE_CONFIG_H*/
|
|
#include <vips/intl.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <math.h>
|
|
|
|
#include <vips/vips.h>
|
|
|
|
#include "transform.h"
|
|
#include "merge.h"
|
|
|
|
#ifdef WITH_DMALLOC
|
|
#include <dmalloc.h>
|
|
#endif /*WITH_DMALLOC*/
|
|
|
|
int
|
|
im_similarity_area( IMAGE *in, IMAGE *out,
|
|
double a, double b, double dx, double dy,
|
|
int ox, int oy, int ow, int oh )
|
|
{
|
|
Transformation trn;
|
|
|
|
trn.oarea.left = ox;
|
|
trn.oarea.top = oy;
|
|
trn.oarea.width = ow;
|
|
trn.oarea.height = oh;
|
|
trn.iarea.left = 0;
|
|
trn.iarea.top = 0;
|
|
trn.iarea.width = in->Xsize;
|
|
trn.iarea.height = in->Ysize;
|
|
trn.a = a;
|
|
trn.b = -b;
|
|
trn.c = b;
|
|
trn.d = a;
|
|
trn.dx = dx;
|
|
trn.dy = dy;
|
|
|
|
return( im__affine( in, out, &trn ) );
|
|
}
|
|
|
|
/* Output the rect holding all our input PELs.
|
|
*/
|
|
int
|
|
im_similarity( IMAGE *in, IMAGE *out,
|
|
double a, double b, double dx, double dy )
|
|
{
|
|
Transformation trn;
|
|
|
|
trn.iarea.left = 0;
|
|
trn.iarea.top = 0;
|
|
trn.iarea.width = in->Xsize;
|
|
trn.iarea.height = in->Ysize;
|
|
trn.a = a;
|
|
trn.b = -b;
|
|
trn.c = b;
|
|
trn.d = a;
|
|
trn.dx = dx;
|
|
trn.dy = dy;
|
|
im__transform_set_area( &trn );
|
|
|
|
if( im__affine( in, out, &trn ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|