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/* Affine transforms.
*/
/*
Copyright (C) 1991-2003 The National Gallery
This program 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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifndef VIPS_TRANSFORM_H
#define VIPS_TRANSFORM_H
#include <glib.h>
#include <vips/image.h>
#include <vips/rect.h>
#ifdef __cplusplus
extern "C" {
#endif /*__cplusplus*/
/* Params for an affine transformation.
*/
typedef struct {
/* Area of input we can use. This can be smaller than the real input
* image: we expand the input to add extra pixels for interpolation.
*/
VipsRect iarea;
/* The area of the output we've been asked to generate. left/top can
* be negative.
*/
VipsRect oarea;
/* The transform.
*/
double a, b, c, d;
double idx, idy;
double odx, ody;
double ia, ib, ic, id; /* Inverse of matrix abcd */
} VipsTransformation;
void vips__transform_init(VipsTransformation *trn);
int vips__transform_calc_inverse(VipsTransformation *trn);
int vips__transform_isidentity(const VipsTransformation *trn);
int vips__transform_add(const VipsTransformation *in1,
const VipsTransformation *in2,
VipsTransformation *out);
void vips__transform_print(const VipsTransformation *trn);
void vips__transform_forward_point(const VipsTransformation *trn,
const double x, const double y, double *ox, double *oy);
void vips__transform_invert_point(const VipsTransformation *trn,
const double x, const double y, double *ox, double *oy);
void vips__transform_forward_rect(const VipsTransformation *trn,
const VipsRect *in, VipsRect *out);
void vips__transform_invert_rect(const VipsTransformation *trn,
const VipsRect *in, VipsRect *out);
void vips__transform_set_area(VipsTransformation *);
int vips__affine(VipsImage *in, VipsImage *out, VipsTransformation *trn);
#ifdef __cplusplus
}
#endif /*__cplusplus*/
#endif /*VIPS_TRANSFORM_H*/