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/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */

/* 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., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, 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 

 */

#include "cairoint.h"

#include "cairo-boxes-private.h"

#include "cairo-error-private.h"

#include "cairo-path-fixed-private.h"

#include "cairo-region-private.h"

#include "cairo-traps-private.h"

typedef struct cairo_filler {

    cairo_polygon_t *polygon;

    double tolerance;

    cairo_box_t limit;

    cairo_bool_t has_limits;

    cairo_point_t current_point;

    cairo_point_t last_move_to;

} cairo_filler_t;

static cairo_status_t

_cairo_filler_line_to (void *closure,

		       const cairo_point_t *point)

{

    cairo_filler_t *filler = closure;

    cairo_status_t status;

    status = _cairo_polygon_add_external_edge (filler->polygon,

					       &filler->current_point,

					       point);

    filler->current_point = *point;

    return status;

}

static cairo_status_t

_cairo_filler_close (void *closure)

{

    cairo_filler_t *filler = closure;

    /* close the subpath */

    return _cairo_filler_line_to (closure, &filler->last_move_to);

}

static cairo_status_t

_cairo_filler_move_to (void *closure,

		       const cairo_point_t *point)

{

    cairo_filler_t *filler = closure;

    cairo_status_t status;

    /* close current subpath */

    status = _cairo_filler_close (closure);

    if (unlikely (status))

	return status;

        /* make sure that the closure represents a degenerate path */

    filler->current_point = *point;

    filler->last_move_to = *point;

    return CAIRO_STATUS_SUCCESS;

}

static cairo_status_t

_cairo_filler_curve_to (void		*closure,

			const cairo_point_t	*p1,

			const cairo_point_t	*p2,

			const cairo_point_t	*p3)

{

    cairo_filler_t *filler = closure;

    cairo_spline_t spline;

    if (filler->has_limits) {

	if (! _cairo_spline_intersects (&filler->current_point, p1, p2, p3,

					&filler->limit))

	    return _cairo_filler_line_to (filler, p3);

    }

    if (! _cairo_spline_init (&spline,

			      (cairo_spline_add_point_func_t)_cairo_filler_line_to, filler,

			      &filler->current_point, p1, p2, p3))

    {

	return _cairo_filler_line_to (closure, p3);

    }

    return _cairo_spline_decompose (&spline, filler->tolerance);

}

cairo_status_t

_cairo_path_fixed_fill_to_polygon (const cairo_path_fixed_t *path,

				   double tolerance,

				   cairo_polygon_t *polygon)

{

    cairo_filler_t filler;

    cairo_status_t status;

    filler.polygon = polygon;

    filler.tolerance = tolerance;

    filler.has_limits = FALSE;

    if (polygon->num_limits) {

	filler.has_limits = TRUE;

	filler.limit = polygon->limit;

    }

    /* make sure that the closure represents a degenerate path */

    filler.current_point.x = 0;

    filler.current_point.y = 0;

    filler.last_move_to = filler.current_point;

    status = _cairo_path_fixed_interpret (path,

					  _cairo_filler_move_to,

					  _cairo_filler_line_to,

					  _cairo_filler_curve_to,

					  _cairo_filler_close,

					  &filler);

    if (unlikely (status))

	return status;

    return _cairo_filler_close (&filler);

}

typedef struct cairo_filler_rectilinear_aligned {

    cairo_polygon_t *polygon;

    cairo_point_t current_point;

    cairo_point_t last_move_to;

} cairo_filler_ra_t;

static cairo_status_t

_cairo_filler_ra_line_to (void *closure,

			  const cairo_point_t *point)

{

    cairo_filler_ra_t *filler = closure;

    cairo_status_t status;

    cairo_point_t p;

    p.x = _cairo_fixed_round_down (point->x);

    p.y = _cairo_fixed_round_down (point->y);

    status = _cairo_polygon_add_external_edge (filler->polygon,

					       &filler->current_point,

					       &p);

    filler->current_point = p;

    return status;

}

static cairo_status_t

_cairo_filler_ra_close (void *closure)

{

    cairo_filler_ra_t *filler = closure;

    return _cairo_filler_ra_line_to (closure, &filler->last_move_to);

}

static cairo_status_t

_cairo_filler_ra_move_to (void *closure,

			  const cairo_point_t *point)

{

    cairo_filler_ra_t *filler = closure;

    cairo_status_t status;

    cairo_point_t p;

    /* close current subpath */

    status = _cairo_filler_ra_close (closure);

    if (unlikely (status))

	return status;

    p.x = _cairo_fixed_round_down (point->x);

    p.y = _cairo_fixed_round_down (point->y);

    /* make sure that the closure represents a degenerate path */

    filler->current_point = p;

    filler->last_move_to = p;

    return CAIRO_STATUS_SUCCESS;

}

cairo_status_t

_cairo_path_fixed_fill_rectilinear_to_polygon (const cairo_path_fixed_t *path,

					       cairo_antialias_t antialias,

					       cairo_polygon_t *polygon)

{

    cairo_filler_ra_t filler;

    cairo_status_t status;

    if (antialias != CAIRO_ANTIALIAS_NONE)

	return _cairo_path_fixed_fill_to_polygon (path, 0., polygon);

    filler.polygon = polygon;

    /* make sure that the closure represents a degenerate path */

    filler.current_point.x = 0;

    filler.current_point.y = 0;

    filler.last_move_to = filler.current_point;

    status = _cairo_path_fixed_interpret_flat (path,

					       _cairo_filler_ra_move_to,

					       _cairo_filler_ra_line_to,

					       _cairo_filler_ra_close,

					       &filler,

					       0.);

    if (unlikely (status))

	return status;

    return _cairo_filler_ra_close (&filler);

}

cairo_status_t

_cairo_path_fixed_fill_to_traps (const cairo_path_fixed_t *path,

				 cairo_fill_rule_t fill_rule,

				 double tolerance,

				 cairo_traps_t *traps)

{

    cairo_polygon_t polygon;

    cairo_status_t status;

    if (_cairo_path_fixed_fill_is_empty (path))

	return CAIRO_STATUS_SUCCESS;

    _cairo_polygon_init (&polygon, traps->limits, traps->num_limits);

    status = _cairo_path_fixed_fill_to_polygon (path, tolerance, &polygon);

    if (unlikely (status || polygon.num_edges == 0))

	goto CLEANUP;

    status = _cairo_bentley_ottmann_tessellate_polygon (traps,

							&polygon, fill_rule);

  CLEANUP:

    _cairo_polygon_fini (&polygon);

    return status;

}

static cairo_status_t

_cairo_path_fixed_fill_rectilinear_tessellate_to_boxes (const cairo_path_fixed_t *path,

							cairo_fill_rule_t fill_rule,

							cairo_antialias_t antialias,

							cairo_boxes_t *boxes)

{

    cairo_polygon_t polygon;

    cairo_status_t status;

    _cairo_polygon_init (&polygon, boxes->limits, boxes->num_limits);

    boxes->num_limits = 0;

    /* tolerance will be ignored as the path is rectilinear */

    status = _cairo_path_fixed_fill_rectilinear_to_polygon (path, antialias, &polygon);

    if (likely (status == CAIRO_STATUS_SUCCESS)) {

	status =

	    _cairo_bentley_ottmann_tessellate_rectilinear_polygon_to_boxes (&polygon,

									    fill_rule,

									    boxes);

    }

    _cairo_polygon_fini (&polygon);

    return status;

}

cairo_status_t

_cairo_path_fixed_fill_rectilinear_to_boxes (const cairo_path_fixed_t *path,

					     cairo_fill_rule_t fill_rule,

					     cairo_antialias_t antialias,

					     cairo_boxes_t *boxes)

{

    cairo_path_fixed_iter_t iter;

    cairo_status_t status;

    cairo_box_t box;

    if (_cairo_path_fixed_is_box (path, &box))

	return _cairo_boxes_add (boxes, antialias, &box);

    _cairo_path_fixed_iter_init (&iter, path);

    while (_cairo_path_fixed_iter_is_fill_box (&iter, &box)) {

	if (box.p1.y == box.p2.y || box.p1.x == box.p2.x)

	    continue;

	if (box.p1.y > box.p2.y) {

	    cairo_fixed_t t;

	    t = box.p1.y;

	    box.p1.y = box.p2.y;

	    box.p2.y = t;

	    t = box.p1.x;

	    box.p1.x = box.p2.x;

	    box.p2.x = t;

	}

	status = _cairo_boxes_add (boxes, antialias, &box);

	if (unlikely (status))

	    return status;

    }

    if (_cairo_path_fixed_iter_at_end (&iter))

	return _cairo_bentley_ottmann_tessellate_boxes (boxes, fill_rule, boxes);

    /* path is not rectangular, try extracting clipped rectilinear edges */

    _cairo_boxes_clear (boxes);

    return _cairo_path_fixed_fill_rectilinear_tessellate_to_boxes (path,

								   fill_rule,

								   antialias,

								   boxes);

}