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/* cairo - a vector graphics library with display and print output

 *

 * Copyright © 2005 Red Hat, Inc.

 *

 * 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 Red Hat, Inc.

 *

 * Contributor(s):

 *	Carl D. Worth 

 */

#ifndef CAIRO_PATH_FIXED_PRIVATE_H

#define CAIRO_PATH_FIXED_PRIVATE_H

#include "cairo-types-private.h"

#include "cairo-compiler-private.h"

#include "cairo-list-private.h"

#define WATCH_PATH 0

#if WATCH_PATH

#include 

#endif

enum cairo_path_op {

    CAIRO_PATH_OP_MOVE_TO = 0,

    CAIRO_PATH_OP_LINE_TO = 1,

    CAIRO_PATH_OP_CURVE_TO = 2,

    CAIRO_PATH_OP_CLOSE_PATH = 3

};

/* we want to make sure a single byte is used for the enum */

typedef char cairo_path_op_t;

/* make _cairo_path_fixed fit into ~512 bytes -- about 50 items */

#define CAIRO_PATH_BUF_SIZE ((512 - sizeof (cairo_path_buf_t)) \

			   / (2 * sizeof (cairo_point_t) + sizeof (cairo_path_op_t)))

#define cairo_path_head(path__) (&(path__)->buf.base)

#define cairo_path_tail(path__) cairo_path_buf_prev (cairo_path_head (path__))

#define cairo_path_buf_next(pos__) \

    cairo_list_entry ((pos__)->link.next, cairo_path_buf_t, link)

#define cairo_path_buf_prev(pos__) \

    cairo_list_entry ((pos__)->link.prev, cairo_path_buf_t, link)

#define cairo_path_foreach_buf_start(pos__, path__) \

    pos__ = cairo_path_head (path__); do

#define cairo_path_foreach_buf_end(pos__, path__) \

    while ((pos__ = cairo_path_buf_next (pos__)) !=  cairo_path_head (path__))

typedef struct _cairo_path_buf {

    cairo_list_t link;

    unsigned int num_ops;

    unsigned int size_ops;

    unsigned int num_points;

    unsigned int size_points;

    cairo_path_op_t *op;

    cairo_point_t *points;

} cairo_path_buf_t;

typedef struct _cairo_path_buf_fixed {

    cairo_path_buf_t base;

    cairo_path_op_t op[CAIRO_PATH_BUF_SIZE];

    cairo_point_t points[2 * CAIRO_PATH_BUF_SIZE];

} cairo_path_buf_fixed_t;

/*

  NOTES:

  has_curve_to => !stroke_is_rectilinear

  fill_is_rectilinear => stroke_is_rectilinear

  fill_is_empty => fill_is_rectilinear

  fill_maybe_region => fill_is_rectilinear

*/

struct _cairo_path_fixed {

    cairo_point_t last_move_point;

    cairo_point_t current_point;

    unsigned int has_current_point	: 1;

    unsigned int needs_move_to		: 1;

    unsigned int has_extents		: 1;

    unsigned int has_curve_to		: 1;

    unsigned int stroke_is_rectilinear	: 1;

    unsigned int fill_is_rectilinear	: 1;

    unsigned int fill_maybe_region	: 1;

    unsigned int fill_is_empty		: 1;

    cairo_box_t extents;

    cairo_path_buf_fixed_t  buf;

};

cairo_private void

_cairo_path_fixed_translate (cairo_path_fixed_t *path,

			     cairo_fixed_t offx,

			     cairo_fixed_t offy);

cairo_private cairo_status_t

_cairo_path_fixed_append (cairo_path_fixed_t		    *path,

			  const cairo_path_fixed_t	    *other,

			  cairo_fixed_t			     tx,

			  cairo_fixed_t			     ty);

cairo_private unsigned long

_cairo_path_fixed_hash (const cairo_path_fixed_t *path);

cairo_private unsigned long

_cairo_path_fixed_size (const cairo_path_fixed_t *path);

cairo_private cairo_bool_t

_cairo_path_fixed_equal (const cairo_path_fixed_t *a,

			 const cairo_path_fixed_t *b);

typedef struct _cairo_path_fixed_iter {

    const cairo_path_buf_t *first;

    const cairo_path_buf_t *buf;

    unsigned int n_op;

    unsigned int n_point;

} cairo_path_fixed_iter_t;

cairo_private void

_cairo_path_fixed_iter_init (cairo_path_fixed_iter_t *iter,

			     const cairo_path_fixed_t *path);

cairo_private cairo_bool_t

_cairo_path_fixed_iter_is_fill_box (cairo_path_fixed_iter_t *_iter,

				    cairo_box_t *box);

cairo_private cairo_bool_t

_cairo_path_fixed_iter_at_end (const cairo_path_fixed_iter_t *iter);

static inline cairo_bool_t

_cairo_path_fixed_fill_is_empty (const cairo_path_fixed_t *path)

{

    return path->fill_is_empty;

}

static inline cairo_bool_t

_cairo_path_fixed_fill_is_rectilinear (const cairo_path_fixed_t *path)

{

    if (! path->fill_is_rectilinear)

	return 0;

    if (! path->has_current_point || path->needs_move_to)

	return 1;

    /* check whether the implicit close preserves the rectilinear property */

    return path->current_point.x == path->last_move_point.x ||

	   path->current_point.y == path->last_move_point.y;

}

static inline cairo_bool_t

_cairo_path_fixed_stroke_is_rectilinear (const cairo_path_fixed_t *path)

{

    return path->stroke_is_rectilinear;

}

static inline cairo_bool_t

_cairo_path_fixed_fill_maybe_region (const cairo_path_fixed_t *path)

{

    if (! path->fill_maybe_region)

	return 0;

    if (! path->has_current_point || path->needs_move_to)

	return 1;

    /* check whether the implicit close preserves the rectilinear property

     * (the integer point property is automatically preserved)

     */

    return path->current_point.x == path->last_move_point.x ||

	   path->current_point.y == path->last_move_point.y;

}

cairo_private cairo_bool_t

_cairo_path_fixed_is_stroke_box (const cairo_path_fixed_t *path,

				 cairo_box_t *box);

cairo_private cairo_bool_t

_cairo_path_fixed_is_simple_quad (const cairo_path_fixed_t *path);

#endif /* CAIRO_PATH_FIXED_PRIVATE_H */