mirror of
https://github.com/ultimatepp/ultimatepp.git
synced 2026-05-17 22:03:07 -06:00
149 lines
4 KiB
C
149 lines
4 KiB
C
/* cairo - a vector graphics library with display and print output
|
|
*
|
|
* Copyright © 2002 University of Southern California
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it either under the terms of the GNU Lesser General Public
|
|
* License version 2.1 as published by the Free Software Foundation
|
|
* (the "LGPL") or, at your option, under the terms of the Mozilla
|
|
* Public License Version 1.1 (the "MPL"). If you do not alter this
|
|
* notice, a recipient may use your version of this file under either
|
|
* the MPL or the LGPL.
|
|
*
|
|
* You should have received a copy of the LGPL along with this library
|
|
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
* You should have received a copy of the MPL along with this library
|
|
* in the file COPYING-MPL-1.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License
|
|
* Version 1.1 (the "License"); you may not use this file except in
|
|
* compliance with the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
|
|
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
|
|
* the specific language governing rights and limitations.
|
|
*
|
|
* The Original Code is the cairo graphics library.
|
|
*
|
|
* The Initial Developer of the Original Code is University of Southern
|
|
* California.
|
|
*
|
|
* Contributor(s):
|
|
* Carl D. Worth <cworth@cworth.org>
|
|
*/
|
|
|
|
#include "cairoint.h"
|
|
|
|
void
|
|
_cairo_polygon_init (cairo_polygon_t *polygon)
|
|
{
|
|
polygon->status = CAIRO_STATUS_SUCCESS;
|
|
|
|
polygon->num_edges = 0;
|
|
|
|
polygon->edges = polygon->edges_embedded;
|
|
polygon->edges_size = ARRAY_LENGTH (polygon->edges_embedded);
|
|
|
|
polygon->has_current_point = FALSE;
|
|
}
|
|
|
|
void
|
|
_cairo_polygon_fini (cairo_polygon_t *polygon)
|
|
{
|
|
if (polygon->edges != polygon->edges_embedded)
|
|
free (polygon->edges);
|
|
}
|
|
|
|
/* make room for at least one more edge */
|
|
static cairo_bool_t
|
|
_cairo_polygon_grow (cairo_polygon_t *polygon)
|
|
{
|
|
cairo_edge_t *new_edges;
|
|
int old_size = polygon->edges_size;
|
|
int new_size = 4 * old_size;
|
|
|
|
if (polygon->edges == polygon->edges_embedded) {
|
|
new_edges = _cairo_malloc_ab (new_size, sizeof (cairo_edge_t));
|
|
if (new_edges != NULL)
|
|
memcpy (new_edges, polygon->edges, old_size * sizeof (cairo_edge_t));
|
|
} else {
|
|
new_edges = _cairo_realloc_ab (polygon->edges,
|
|
new_size, sizeof (cairo_edge_t));
|
|
}
|
|
|
|
if (new_edges == NULL) {
|
|
polygon->status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
|
|
return FALSE;
|
|
}
|
|
|
|
polygon->edges = new_edges;
|
|
polygon->edges_size = new_size;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
_cairo_polygon_add_edge (cairo_polygon_t *polygon,
|
|
const cairo_point_t *p1,
|
|
const cairo_point_t *p2)
|
|
{
|
|
cairo_edge_t *edge;
|
|
|
|
/* drop horizontal edges */
|
|
if (p1->y == p2->y)
|
|
goto DONE;
|
|
|
|
if (polygon->num_edges == polygon->edges_size) {
|
|
if (! _cairo_polygon_grow (polygon))
|
|
return;
|
|
}
|
|
|
|
edge = &polygon->edges[polygon->num_edges++];
|
|
if (p1->y < p2->y) {
|
|
edge->edge.p1 = *p1;
|
|
edge->edge.p2 = *p2;
|
|
edge->clockWise = 1;
|
|
} else {
|
|
edge->edge.p1 = *p2;
|
|
edge->edge.p2 = *p1;
|
|
edge->clockWise = 0;
|
|
}
|
|
|
|
DONE:
|
|
_cairo_polygon_move_to (polygon, p2);
|
|
}
|
|
|
|
void
|
|
_cairo_polygon_move_to (cairo_polygon_t *polygon,
|
|
const cairo_point_t *point)
|
|
{
|
|
if (! polygon->has_current_point)
|
|
polygon->first_point = *point;
|
|
|
|
polygon->current_point = *point;
|
|
polygon->has_current_point = TRUE;
|
|
}
|
|
|
|
void
|
|
_cairo_polygon_line_to (cairo_polygon_t *polygon,
|
|
const cairo_point_t *point)
|
|
{
|
|
if (polygon->has_current_point)
|
|
_cairo_polygon_add_edge (polygon, &polygon->current_point, point);
|
|
else
|
|
_cairo_polygon_move_to (polygon, point);
|
|
}
|
|
|
|
void
|
|
_cairo_polygon_close (cairo_polygon_t *polygon)
|
|
{
|
|
if (polygon->has_current_point) {
|
|
_cairo_polygon_add_edge (polygon,
|
|
&polygon->current_point,
|
|
&polygon->first_point);
|
|
|
|
polygon->has_current_point = FALSE;
|
|
}
|
|
}
|