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  1. /* cairo - a vector graphics library with display and print output
  2.  *
  3.  * Copyright © 2002 University of Southern California
  4.  * Copyright © 2005 Red Hat, Inc.
  5.  *
  6.  * This library is free software; you can redistribute it and/or
  7.  * modify it either under the terms of the GNU Lesser General Public
  8.  * License version 2.1 as published by the Free Software Foundation
  9.  * (the "LGPL") or, at your option, under the terms of the Mozilla
  10.  * Public License Version 1.1 (the "MPL"). If you do not alter this
  11.  * notice, a recipient may use your version of this file under either
  12.  * the MPL or the LGPL.
  13.  *
  14.  * You should have received a copy of the LGPL along with this library
  15.  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
  16.  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
  17.  * You should have received a copy of the MPL along with this library
  18.  * in the file COPYING-MPL-1.1
  19.  *
  20.  * The contents of this file are subject to the Mozilla Public License
  21.  * Version 1.1 (the "License"); you may not use this file except in
  22.  * compliance with the License. You may obtain a copy of the License at
  23.  * http://www.mozilla.org/MPL/
  24.  *
  25.  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
  26.  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
  27.  * the specific language governing rights and limitations.
  28.  *
  29.  * The Original Code is the cairo graphics library.
  30.  *
  31.  * The Initial Developer of the Original Code is University of Southern
  32.  * California.
  33.  *
  34.  * Contributor(s):
  35.  *      Carl D. Worth <cworth@cworth.org>
  36.  */
  37.  
  38. #ifndef CAIRO_TRAPS_PRIVATE_H
  39. #define CAIRO_TRAPS_PRIVATE_H
  40.  
  41. #include "cairo-compiler-private.h"
  42. #include "cairo-error-private.h"
  43. #include "cairo-types-private.h"
  44.  
  45. CAIRO_BEGIN_DECLS
  46.  
  47. struct _cairo_traps {
  48.     cairo_status_t status;
  49.  
  50.     cairo_box_t bounds;
  51.     const cairo_box_t *limits;
  52.     int num_limits;
  53.  
  54.     unsigned int maybe_region : 1; /* hint: 0 implies that it cannot be */
  55.     unsigned int has_intersections : 1;
  56.     unsigned int is_rectilinear : 1;
  57.     unsigned int is_rectangular : 1;
  58.  
  59.     int num_traps;
  60.     int traps_size;
  61.     cairo_trapezoid_t *traps;
  62.     cairo_trapezoid_t  traps_embedded[16];
  63. };
  64.  
  65. /* cairo-traps.c */
  66. cairo_private void
  67. _cairo_traps_init (cairo_traps_t *traps);
  68.  
  69. cairo_private void
  70. _cairo_traps_init_with_clip (cairo_traps_t *traps,
  71.                              const cairo_clip_t *clip);
  72.  
  73. cairo_private void
  74. _cairo_traps_limit (cairo_traps_t       *traps,
  75.                     const cairo_box_t   *boxes,
  76.                     int                  num_boxes);
  77.  
  78. cairo_private cairo_status_t
  79. _cairo_traps_init_boxes (cairo_traps_t      *traps,
  80.                          const cairo_boxes_t *boxes);
  81.  
  82. cairo_private void
  83. _cairo_traps_clear (cairo_traps_t *traps);
  84.  
  85. cairo_private void
  86. _cairo_traps_fini (cairo_traps_t *traps);
  87.  
  88. #define _cairo_traps_status(T) (T)->status
  89.  
  90. cairo_private void
  91. _cairo_traps_translate (cairo_traps_t *traps, int x, int y);
  92.  
  93. cairo_private void
  94. _cairo_traps_tessellate_triangle (cairo_traps_t *traps,
  95.                                   const cairo_point_t t[3]);
  96.  
  97. cairo_private void
  98. _cairo_traps_tessellate_convex_quad (cairo_traps_t *traps,
  99.                                      const cairo_point_t q[4]);
  100.  
  101. cairo_private cairo_status_t
  102. _cairo_traps_tessellate_rectangle (cairo_traps_t *traps,
  103.                                    const cairo_point_t *top_left,
  104.                                    const cairo_point_t *bottom_right);
  105.  
  106. cairo_private void
  107. _cairo_traps_add_trap (cairo_traps_t *traps,
  108.                        cairo_fixed_t top, cairo_fixed_t bottom,
  109.                        cairo_line_t *left, cairo_line_t *right);
  110.  
  111. cairo_private int
  112. _cairo_traps_contain (const cairo_traps_t *traps,
  113.                       double x, double y);
  114.  
  115. cairo_private void
  116. _cairo_traps_extents (const cairo_traps_t *traps,
  117.                       cairo_box_t         *extents);
  118.  
  119. cairo_private cairo_int_status_t
  120. _cairo_traps_extract_region (cairo_traps_t  *traps,
  121.                              cairo_antialias_t antialias,
  122.                              cairo_region_t **region);
  123.  
  124. cairo_private cairo_bool_t
  125. _cairo_traps_to_boxes (cairo_traps_t *traps,
  126.                        cairo_antialias_t antialias,
  127.                        cairo_boxes_t *boxes);
  128.  
  129. cairo_private cairo_status_t
  130. _cairo_traps_path (const cairo_traps_t *traps,
  131.                    cairo_path_fixed_t  *path);
  132.  
  133. cairo_private cairo_int_status_t
  134. _cairo_rasterise_polygon_to_traps (cairo_polygon_t                      *polygon,
  135.                                    cairo_fill_rule_t                     fill_rule,
  136.                                    cairo_antialias_t                     antialias,
  137.                                    cairo_traps_t *traps);
  138.  
  139. CAIRO_END_DECLS
  140.  
  141. #endif /* CAIRO_TRAPS_PRIVATE_H */
  142.