/usr/include/vips/transform.h is in libvips-dev 7.26.3-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | /* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/* 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 dx, dy;
double ia, ib, ic, id; /* Inverse of matrix abcd */
} Transformation;
void im__transform_init( Transformation *trn );
int im__transform_calc_inverse( Transformation *trn );
int im__transform_isidentity( const Transformation *trn );
int im__transform_add( const Transformation *in1, const Transformation *in2,
Transformation *out );
void im__transform_print( const Transformation *trn );
void im__transform_forward_point( const Transformation *trn,
const double x, const double y, double *ox, double *oy );
void im__transform_invert_point( const Transformation *trn,
const double x, const double y, double *ox, double *oy );
void im__transform_forward_rect( const Transformation *trn,
const VipsRect *in, VipsRect *out );
void im__transform_invert_rect( const Transformation *trn,
const VipsRect *in, VipsRect *out );
void im__transform_set_area( Transformation * );
int im__affine( VipsImage *in, VipsImage *out, Transformation *trn );
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