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/* cairo - a vector graphics library with display and print output
*
* Copyright © 2003 University of Southern California
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* 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_move_to (void *closure, cairo_point_t *point);
static cairo_status_t
_cairo_path_bounder_line_to (void *closure, cairo_point_t *point);
static cairo_status_t
_cairo_path_bounder_curve_to (void *closure,
cairo_point_t *b,
cairo_point_t *c,
cairo_point_t *d);
static cairo_status_t
_cairo_path_bounder_close_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_move_to (void *closure, cairo_point_t *point)
{
cairo_path_bounder_t *bounder = closure;
_cairo_path_bounder_add_point (bounder, point);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_path_bounder_line_to (void *closure, cairo_point_t *point)
{
cairo_path_bounder_t *bounder = closure;
_cairo_path_bounder_add_point (bounder, point);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_path_bounder_curve_to (void *closure,
cairo_point_t *b,
cairo_point_t *c,
cairo_point_t *d)
{
cairo_path_bounder_t *bounder = closure;
_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_close_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;
cairo_path_bounder_t bounder;
_cairo_path_bounder_init (&bounder);
status = _cairo_path_interpret (path, CAIRO_DIRECTION_FORWARD,
_cairo_path_bounder_move_to,
_cairo_path_bounder_line_to,
_cairo_path_bounder_curve_to,
_cairo_path_bounder_close_path,
&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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