/* 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 <cworth@redhat.com>
*/
#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 <stdio.h>
#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 */