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/*
* affine.h -- Affine Transforms for 2d objects
* Copyright (C) 2002 Charles Yates <charles.yates@pandora.be>
* Portions Copyright (C) 2003 Dan Dennedy <dan@dennedy.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
*
* You should have received a copy of the GNU 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.
*/
#ifndef _AFFINE_H
#define _AFFINE_H
#include <math.h>
/** Affine transforms for 2d image manipulation. Current provides shearing and
rotating support.
*/
typedef struct {
double matrix[2][2];
} affine_transform_t;
void affine_transform_init( affine_transform_t *this );
void affine_transform_rotate( affine_transform_t *this, double angle );
void affine_transform_shear( affine_transform_t *this, double shear );
void affine_transform_scale( affine_transform_t *this, double sx, double sy );
double affine_transform_mapx( affine_transform_t *this, int x, int y );
double affine_transform_mapy( affine_transform_t *this, int x, int y );
void affine_scale( const unsigned char *src, unsigned char *dest, int src_width, int src_height, int dest_width, int dest_height, int bpp );
#endif
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