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  1. /* cairo - a vector graphics library with display and print output
  2.  *
  3.  * Copyright © 2011 Intel Corporation
  4.  *
  5.  * This library is free software; you can redistribute it and/or
  6.  * modify it either under the terms of the GNU Lesser General Public
  7.  * License version 2.1 as published by the Free Software Foundation
  8.  * (the "LGPL") or, at your option, under the terms of the Mozilla
  9.  * Public License Version 1.1 (the "MPL"). If you do not alter this
  10.  * notice, a recipient may use your version of this file under either
  11.  * the MPL or the LGPL.
  12.  *
  13.  * You should have received a copy of the LGPL along with this library
  14.  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
  15.  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
  16.  * You should have received a copy of the MPL along with this library
  17.  * in the file COPYING-MPL-1.1
  18.  *
  19.  * The contents of this file are subject to the Mozilla Public License
  20.  * Version 1.1 (the "License"); you may not use this file except in
  21.  * compliance with the License. You may obtain a copy of the License at
  22.  * http://www.mozilla.org/MPL/
  23.  *
  24.  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
  25.  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
  26.  * the specific language governing rights and limitations.
  27.  *
  28.  * The Original Code is the cairo graphics library.
  29.  *
  30.  * The Initial Developer of the Original Code is Intel Corporation
  31.  *
  32.  * Contributor(s):
  33.  *      Chris Wilson <chris@chris-wilson.co.uk>
  34.  */
  35.  
  36. #ifndef CAIRO_CONTOUR_PRIVATE_H
  37. #define CAIRO_CONTOUR_PRIVATE_H
  38.  
  39. #include "cairo-types-private.h"
  40. #include "cairo-compiler-private.h"
  41. #include "cairo-error-private.h"
  42. #include "cairo-list-private.h"
  43.  
  44. #include <stdio.h>
  45.  
  46. CAIRO_BEGIN_DECLS
  47.  
  48. /* A contour is simply a closed chain of points that divide the infinite plane
  49.  * into inside and outside. Each contour is a simple polygon, that is it
  50.  * contains no holes or self-intersections, but maybe either concave or convex.
  51.  */
  52.  
  53. struct _cairo_contour_chain {
  54.     cairo_point_t *points;
  55.     int num_points, size_points;
  56.     struct _cairo_contour_chain *next;
  57. };
  58.  
  59. struct _cairo_contour_iter {
  60.     cairo_point_t *point;
  61.     cairo_contour_chain_t *chain;
  62. };
  63.  
  64. struct _cairo_contour {
  65.     cairo_list_t next;
  66.     int direction;
  67.     cairo_contour_chain_t chain, *tail;
  68.  
  69.     cairo_point_t embedded_points[64];
  70. };
  71.  
  72. /* Initial definition of a shape is a set of contours (some representing holes) */
  73. struct _cairo_shape {
  74.     cairo_list_t contours;
  75. };
  76.  
  77. typedef struct _cairo_shape cairo_shape_t;
  78.  
  79. #if 0
  80. cairo_private cairo_status_t
  81. _cairo_shape_init_from_polygon (cairo_shape_t *shape,
  82.                                 const cairo_polygon_t *polygon);
  83.  
  84. cairo_private cairo_status_t
  85. _cairo_shape_reduce (cairo_shape_t *shape, double tolerance);
  86. #endif
  87.  
  88. cairo_private void
  89. _cairo_contour_init (cairo_contour_t *contour,
  90.                      int direction);
  91.  
  92. cairo_private cairo_int_status_t
  93. __cairo_contour_add_point (cairo_contour_t *contour,
  94.                            const cairo_point_t *point);
  95.  
  96. cairo_private void
  97. _cairo_contour_simplify (cairo_contour_t *contour, double tolerance);
  98.  
  99. cairo_private void
  100. _cairo_contour_reverse (cairo_contour_t *contour);
  101.  
  102. cairo_private cairo_int_status_t
  103. _cairo_contour_add (cairo_contour_t *dst,
  104.                     const cairo_contour_t *src);
  105.  
  106. cairo_private cairo_int_status_t
  107. _cairo_contour_add_reversed (cairo_contour_t *dst,
  108.                              const cairo_contour_t *src);
  109.  
  110. cairo_private void
  111. __cairo_contour_remove_last_chain (cairo_contour_t *contour);
  112.  
  113. cairo_private void
  114. _cairo_contour_reset (cairo_contour_t *contour);
  115.  
  116. cairo_private void
  117. _cairo_contour_fini (cairo_contour_t *contour);
  118.  
  119. cairo_private void
  120. _cairo_debug_print_contour (FILE *file, cairo_contour_t *contour);
  121.  
  122. CAIRO_END_DECLS
  123.  
  124. #endif /* CAIRO_CONTOUR_PRIVATE_H */
  125.