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Current File : /proc/self/root/proc/self/root/proc/self/root/proc/1271035/root/usr/include/vips/transform.h
/* 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*/

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