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/* 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"
#include "cairo-path-fixed-private.h"
typedef struct cairo_filler {
double tolerance;
cairo_traps_t *traps;
cairo_point_t current_point;
cairo_polygon_t polygon;
} cairo_filler_t;
static void
_cairo_filler_init (cairo_filler_t *filler, double tolerance, cairo_traps_t *traps);
static void
_cairo_filler_fini (cairo_filler_t *filler);
static cairo_status_t
_cairo_filler_move_to (void *closure, cairo_point_t *point);
static cairo_status_t
_cairo_filler_line_to (void *closure, cairo_point_t *point);
static cairo_status_t
_cairo_filler_curve_to (void *closure,
cairo_point_t *b,
cairo_point_t *c,
cairo_point_t *d);
static cairo_status_t
_cairo_filler_close_path (void *closure);
static void
_cairo_filler_init (cairo_filler_t *filler, double tolerance, cairo_traps_t *traps)
{
filler->tolerance = tolerance;
filler->traps = traps;
filler->current_point.x = 0;
filler->current_point.y = 0;
_cairo_polygon_init (&filler->polygon);
}
static void
_cairo_filler_fini (cairo_filler_t *filler)
{
_cairo_polygon_fini (&filler->polygon);
}
static cairo_status_t
_cairo_filler_move_to (void *closure, cairo_point_t *point)
{
cairo_filler_t *filler = closure;
cairo_polygon_t *polygon = &filler->polygon;
_cairo_polygon_close (polygon);
_cairo_polygon_move_to (polygon, point);
filler->current_point = *point;
return _cairo_polygon_status (&filler->polygon);
}
static cairo_status_t
_cairo_filler_line_to (void *closure, cairo_point_t *point)
{
cairo_filler_t *filler = closure;
cairo_polygon_t *polygon = &filler->polygon;
_cairo_polygon_line_to (polygon, point);
filler->current_point = *point;
return _cairo_polygon_status (&filler->polygon);
}
static cairo_status_t
_cairo_filler_curve_to (void *closure,
cairo_point_t *b,
cairo_point_t *c,
cairo_point_t *d)
{
cairo_filler_t *filler = closure;
cairo_spline_t spline;
if (! _cairo_spline_init (&spline,
(cairo_add_point_func_t) _cairo_polygon_line_to,
&filler->polygon,
&filler->current_point, b, c, d))
{
return CAIRO_STATUS_SUCCESS;
}
_cairo_spline_decompose (&spline, filler->tolerance);
_cairo_spline_fini (&spline);
filler->current_point = *d;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_filler_close_path (void *closure)
{
cairo_filler_t *filler = closure;
cairo_polygon_t *polygon = &filler->polygon;
_cairo_polygon_close (polygon);
return _cairo_polygon_status (polygon);
}
static cairo_int_status_t
_cairo_path_fixed_fill_rectangle (cairo_path_fixed_t *path,
cairo_traps_t *traps);
cairo_status_t
_cairo_path_fixed_fill_to_traps (cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_traps_t *traps)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
cairo_filler_t filler;
/* Before we do anything else, we use a special-case filler for
* a device-axis aligned rectangle if possible. */
status = _cairo_path_fixed_fill_rectangle (path, traps);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
_cairo_filler_init (&filler, tolerance, traps);
status = _cairo_path_fixed_interpret (path,
CAIRO_DIRECTION_FORWARD,
_cairo_filler_move_to,
_cairo_filler_line_to,
_cairo_filler_curve_to,
_cairo_filler_close_path,
&filler);
if (status)
goto BAIL;
_cairo_polygon_close (&filler.polygon);
status = _cairo_polygon_status (&filler.polygon);
if (status)
goto BAIL;
status = _cairo_bentley_ottmann_tessellate_polygon (filler.traps,
&filler.polygon,
fill_rule);
if (status)
goto BAIL;
BAIL:
_cairo_filler_fini (&filler);
return status;
}
/* This special-case filler supports only a path that describes a
* device-axis aligned rectangle. It exists to avoid the overhead of
* the general tessellator when drawing very common rectangles.
*
* If the path described anything but a device-axis aligned rectangle,
* this function will return %CAIRO_INT_STATUS_UNSUPPORTED.
*/
static cairo_int_status_t
_cairo_path_fixed_fill_rectangle (cairo_path_fixed_t *path,
cairo_traps_t *traps)
{
if (_cairo_path_fixed_is_box (path, NULL)) {
cairo_point_t *p = path->buf_head.base.points;
cairo_point_t *top_left, *bot_right;
top_left = &p[0];
bot_right = &p[2];
if (top_left->x > bot_right->x || top_left->y > bot_right->y) {
int n;
/* not a simple cairo_rectangle() */
for (n = 0; n < 4; n++) {
if (p[n].x <= top_left->x && p[n].y <= top_left->y)
top_left = &p[n];
if (p[n].x >= bot_right->x && p[n].y >= bot_right->y)
bot_right = &p[n];
}
}
return _cairo_traps_tessellate_rectangle (traps, top_left, bot_right);
}
return CAIRO_INT_STATUS_UNSUPPORTED;
}
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