68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
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/* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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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/* 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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Rect 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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Rect 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 dx, dy;
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double ia, ib, ic, id; /* Inverse of matrix abcd */
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} Transformation;
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void im__transform_init( Transformation *trn );
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int im__transform_calc_inverse( Transformation *trn );
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int im__transform_isidentity( const Transformation *trn );
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int im__transform_add( const Transformation *in1, const Transformation *in2,
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Transformation *out );
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void im__transform_print( const Transformation *trn );
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void im__transform_forward_point( const Transformation *trn,
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const double x, const double y, double *ox, double *oy );
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void im__transform_invert_point( const Transformation *trn,
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const double x, const double y, double *ox, double *oy );
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void im__transform_forward_rect( const Transformation *trn,
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const Rect *in, Rect *out );
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void im__transform_invert_rect( const Transformation *trn,
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const Rect *in, Rect *out );
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void im__transform_set_area( Transformation * );
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