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44 lines
1.7 KiB
44 lines
1.7 KiB
/*
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* affine.h -- Affine Transforms for 2d objects
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* Copyright (C) 2002 Charles Yates <charles.yates@pandora.be>
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* Portions Copyright (C) 2003 Dan Dennedy <dan@dennedy.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU 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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*
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef _AFFINE_H
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#define _AFFINE_H
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#include <math.h>
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/** Affine transforms for 2d image manipulation. Current provides shearing and
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rotating support.
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*/
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typedef struct {
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double matrix[2][2];
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} affine_transform_t;
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void affine_transform_init( affine_transform_t *this );
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void affine_transform_rotate( affine_transform_t *this, double angle );
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void affine_transform_shear( affine_transform_t *this, double shear );
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void affine_transform_scale( affine_transform_t *this, double sx, double sy );
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double affine_transform_mapx( affine_transform_t *this, int x, int y );
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double affine_transform_mapy( affine_transform_t *this, int x, int y );
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void affine_scale( const unsigned char *src, unsigned char *dest, int src_width, int src_height, int dest_width, int dest_height, int bpp );
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#endif
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