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  1. /* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
  2. /* cairo - a vector graphics library with display and print output
  3.  *
  4.  * Copyright © 2002 University of Southern California
  5.  * Copyright © 2005 Red Hat, Inc.
  6.  * Copyright © 2009 Chris Wilson
  7.  *
  8.  * This library is free software; you can redistribute it and/or
  9.  * modify it either under the terms of the GNU Lesser General Public
  10.  * License version 2.1 as published by the Free Software Foundation
  11.  * (the "LGPL") or, at your option, under the terms of the Mozilla
  12.  * Public License Version 1.1 (the "MPL"). If you do not alter this
  13.  * notice, a recipient may use your version of this file under either
  14.  * the MPL or the LGPL.
  15.  *
  16.  * You should have received a copy of the LGPL along with this library
  17.  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
  19.  * You should have received a copy of the MPL along with this library
  20.  * in the file COPYING-MPL-1.1
  21.  *
  22.  * The contents of this file are subject to the Mozilla Public License
  23.  * Version 1.1 (the "License"); you may not use this file except in
  24.  * compliance with the License. You may obtain a copy of the License at
  25.  * http://www.mozilla.org/MPL/
  26.  *
  27.  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
  28.  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
  29.  * the specific language governing rights and limitations.
  30.  *
  31.  * The Original Code is the cairo graphics library.
  32.  *
  33.  * The Initial Developer of the Original Code is University of Southern
  34.  * California.
  35.  *
  36.  * Contributor(s):
  37.  *      Carl D. Worth <cworth@cworth.org>
  38.  *      Kristian Høgsberg <krh@redhat.com>
  39.  *      Chris Wilson <chris@chris-wilson.co.uk>
  40.  */
  41.  
  42. #include "cairoint.h"
  43. #include "cairo-clip-private.h"
  44. #include "cairo-error-private.h"
  45. #include "cairo-freed-pool-private.h"
  46. #include "cairo-gstate-private.h"
  47. #include "cairo-path-fixed-private.h"
  48. #include "cairo-pattern-private.h"
  49. #include "cairo-composite-rectangles-private.h"
  50. #include "cairo-region-private.h"
  51.  
  52. static void
  53. _cairo_clip_extract_region (cairo_clip_t *clip)
  54. {
  55.     cairo_rectangle_int_t stack_rects[CAIRO_STACK_ARRAY_LENGTH (cairo_rectangle_int_t)];
  56.     cairo_rectangle_int_t *r = stack_rects;
  57.     cairo_bool_t is_region;
  58.     int i;
  59.  
  60.     if (clip->num_boxes == 0)
  61.         return;
  62.  
  63.     if (clip->num_boxes > ARRAY_LENGTH (stack_rects)) {
  64.         r = _cairo_malloc_ab (clip->num_boxes, sizeof (cairo_rectangle_int_t));
  65.         if (r == NULL){
  66.             _cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
  67.             return;
  68.         }
  69.     }
  70.  
  71.     is_region = clip->path == NULL;
  72.     for (i = 0; i < clip->num_boxes; i++) {
  73.         cairo_box_t *b = &clip->boxes[i];
  74.         if (is_region)
  75.             is_region =
  76.                 _cairo_fixed_is_integer (b->p1.x | b->p1.y |  b->p2.x | b->p2.y);
  77.         r[i].x = _cairo_fixed_integer_floor (b->p1.x);
  78.         r[i].y = _cairo_fixed_integer_floor (b->p1.y);
  79.         r[i].width  = _cairo_fixed_integer_ceil (b->p2.x) - r[i].x;
  80.         r[i].height = _cairo_fixed_integer_ceil (b->p2.y) - r[i].y;
  81.     }
  82.     clip->is_region = is_region;
  83.  
  84.     clip->region = cairo_region_create_rectangles (r, i);
  85.  
  86.     if (r != stack_rects)
  87.         free (r);
  88. }
  89.  
  90. cairo_region_t *
  91. _cairo_clip_get_region (const cairo_clip_t *clip)
  92. {
  93.     if (clip == NULL)
  94.         return NULL;
  95.  
  96.     if (clip->region == NULL)
  97.         _cairo_clip_extract_region ((cairo_clip_t *) clip);
  98.  
  99.     return clip->region;
  100. }
  101.  
  102. cairo_bool_t
  103. _cairo_clip_is_region (const cairo_clip_t *clip)
  104. {
  105.     if (clip == NULL)
  106.         return TRUE;
  107.  
  108.     if (clip->is_region)
  109.         return TRUE;
  110.  
  111.     /* XXX Geometric reduction? */
  112.  
  113.     if (clip->path)
  114.         return FALSE;
  115.  
  116.     if (clip->num_boxes == 0)
  117.         return TRUE;
  118.  
  119.     if (clip->region == NULL)
  120.         _cairo_clip_extract_region ((cairo_clip_t *) clip);
  121.  
  122.     return clip->is_region;
  123. }
  124.