Synopsis
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 *Param1
);
int im__affine (VipsImage *in
,
VipsImage *out
,
Transformation *trn
);
Details
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;
im__transform_calc_inverse ()
int im__transform_calc_inverse (Transformation *trn
);
im__transform_isidentity ()
int im__transform_isidentity (const Transformation *trn
);
im__transform_print ()
void im__transform_print (const Transformation *trn
);
im__transform_forward_point ()
void im__transform_forward_point (const Transformation *trn
,
const double x
,
const double y
,
double *ox
,
double *oy
);
im__transform_invert_point ()
void im__transform_invert_point (const Transformation *trn
,
const double x
,
const double y
,
double *ox
,
double *oy
);
im__transform_set_area ()
void im__transform_set_area (Transformation *Param1
);