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/*
* Copyright © 2003 University of Southern California
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of the
* University of Southern California not be used in advertising or
* publicity pertaining to distribution of the software without
* specific, written prior permission. The University of Southern
* California makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THE UNIVERSITY OF SOUTHERN CALIFORNIA DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE UNIVERSITY OF
* SOUTHERN CALIFORNIA BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Carl D. Worth <cworth@isi.edu>
*/
#include "cairoint.h"
typedef struct cairo_path_bounder {
int has_point;
cairo_fixed_t min_x;
cairo_fixed_t min_y;
cairo_fixed_t max_x;
cairo_fixed_t max_y;
} cairo_path_bounder_t;
static void
_cairo_path_bounder_init (cairo_path_bounder_t *bounder);
static void
_cairo_path_bounder_fini (cairo_path_bounder_t *bounder);
static cairo_status_t
_cairo_path_bounder_add_point (cairo_path_bounder_t *bounder, cairo_point_t *point);
static cairo_status_t
_cairo_path_bounder_add_edge (void *closure, cairo_point_t *p1, cairo_point_t *p2);
static cairo_status_t
_cairo_path_bounder_add_spline (void *closure,
cairo_point_t *a, cairo_point_t *b,
cairo_point_t *c, cairo_point_t *d);
static cairo_status_t
_cairo_path_bounder_done_sub_path (void *closure, cairo_sub_path_done_t done);
static cairo_status_t
_cairo_path_bounder_done_path (void *closure);
static void
_cairo_path_bounder_init (cairo_path_bounder_t *bounder)
{
bounder->has_point = 0;
}
static void
_cairo_path_bounder_fini (cairo_path_bounder_t *bounder)
{
bounder->has_point = 0;
}
static cairo_status_t
_cairo_path_bounder_add_point (cairo_path_bounder_t *bounder, cairo_point_t *point)
{
if (bounder->has_point) {
if (point->x < bounder->min_x)
bounder->min_x = point->x;
if (point->y < bounder->min_y)
bounder->min_y = point->y;
if (point->x > bounder->max_x)
bounder->max_x = point->x;
if (point->y > bounder->max_y)
bounder->max_y = point->y;
} else {
bounder->min_x = point->x;
bounder->min_y = point->y;
bounder->max_x = point->x;
bounder->max_y = point->y;
bounder->has_point = 1;
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_path_bounder_add_edge (void *closure, cairo_point_t *p1, cairo_point_t *p2)
{
cairo_path_bounder_t *bounder = closure;
_cairo_path_bounder_add_point (bounder, p1);
_cairo_path_bounder_add_point (bounder, p2);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_path_bounder_add_spline (void *closure,
cairo_point_t *a, cairo_point_t *b,
cairo_point_t *c, cairo_point_t *d)
{
cairo_path_bounder_t *bounder = closure;
_cairo_path_bounder_add_point (bounder, a);
_cairo_path_bounder_add_point (bounder, b);
_cairo_path_bounder_add_point (bounder, c);
_cairo_path_bounder_add_point (bounder, d);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_path_bounder_done_sub_path (void *closure, cairo_sub_path_done_t done)
{
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_path_bounder_done_path (void *closure)
{
return CAIRO_STATUS_SUCCESS;
}
/* XXX: Perhaps this should compute a PixRegion rather than 4 doubles */
cairo_status_t
_cairo_path_bounds (cairo_path_t *path, double *x1, double *y1, double *x2, double *y2)
{
cairo_status_t status;
static cairo_path_callbacks_t const cb = {
_cairo_path_bounder_add_edge,
_cairo_path_bounder_add_spline,
_cairo_path_bounder_done_sub_path,
_cairo_path_bounder_done_path
};
cairo_path_bounder_t bounder;
_cairo_path_bounder_init (&bounder);
status = _cairo_path_interpret (path, CAIRO_DIRECTION_FORWARD, &cb, &bounder);
if (status) {
*x1 = *y1 = *x2 = *y2 = 0.0;
_cairo_path_bounder_fini (&bounder);
return status;
}
*x1 = _cairo_fixed_to_double (bounder.min_x);
*y1 = _cairo_fixed_to_double (bounder.min_y);
*x2 = _cairo_fixed_to_double (bounder.max_x);
*y2 = _cairo_fixed_to_double (bounder.max_y);
_cairo_path_bounder_fini (&bounder);
return CAIRO_STATUS_SUCCESS;
}
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