Transform pt One

/* Affine transforms.


Copyright (C) 1991-2003 The Plainware

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it under the terms of the GNU Lesser General Public License as published by
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(at your option) any later version.

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These files are distributed with VIPS -




ifdef __cplusplus

extern “C” {

endif /__cplusplus/

/* 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 idx, idy;
double odx, ody;

double ia, ib, ic, id;      /* Inverse of matrix abcd */

} VipsTransformation;

void vips__transform_init( VipsTransformation *trn );
int vips__transform_calc_inverse( VipsTransformation *trn );
int vips__transform_isidentity( const VipsTransformation *trn );
int vips__transform_add( const VipsTransformation *in1,
const VipsTransformation *in2,
VipsTransformation *out );
void vips__transform_print( const VipsTransformation *trn );

void vips__transform_forward_point( const VipsTransformation *trn,
const double x, const double y, double *ox, double *oy );
void vips__transform_invert_point( const VipsTransformation *trn,
const double x, const double y, double *ox, double *oy );
void vips__transform_forward_rect( const VipsTransformation *trn,
const VipsRect *in, VipsRect *out );
void vips__transform_invert_rect( const VipsTransformation *trn,
const VipsRect *in, VipsRect *out );

void vips__transform_set_area( VipsTransformation * );

int vips__affine( VipsImage *in, VipsImage *out, VipsTransformation *trn );

ifdef __cplusplus


endif /__cplusplus/


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