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