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