cairo/src/cairo-region.c

   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 © 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 Red Hat, Inc.
  32  *
  33  * Contributor(s):
  34  *      Owen Taylor <otaylor@redhat.com>
  35  *      Vladimir Vukicevic <vladimir@pobox.com>
  36  */
  37
  38 #include "cairoint.h"
  39
  40 void
  41 _cairo_region_init (cairo_region_t *region)
  42 {
  43     pixman_region32_init (&region->rgn);
  44 }
  45
  46 void
  47 _cairo_region_init_rect (cairo_region_t *region,
  48                          cairo_rectangle_int_t *rect)
  49 {
  50     pixman_region32_init_rect (&region->rgn,
  51                              rect->x, rect->y,
  52                              rect->width, rect->height);
  53 }
  54
  55 cairo_int_status_t
  56 _cairo_region_init_boxes (cairo_region_t *region,
  57                           cairo_box_int_t *boxes,
  58                           int count)
  59 {
  60     pixman_box32_t stack_pboxes[CAIRO_STACK_ARRAY_LENGTH (pixman_box32_t)];
  61     pixman_box32_t *pboxes = stack_pboxes;
  62     cairo_int_status_t status = CAIRO_STATUS_SUCCESS;
  63     int i;
  64
  65     if (count > ARRAY_LENGTH(stack_pboxes)) {
  66         pboxes = _cairo_malloc_ab (count, sizeof(pixman_box32_t));
  67         if (pboxes == NULL)
  68             return _cairo_error (CAIRO_STATUS_NO_MEMORY);
  69     }
  70
  71     for (i = 0; i < count; i++) {
  72         pboxes[i].x1 = boxes[i].p1.x;
  73         pboxes[i].y1 = boxes[i].p1.y;
  74         pboxes[i].x2 = boxes[i].p2.x;
  75         pboxes[i].y2 = boxes[i].p2.y;
  76     }
  77
  78     if (!pixman_region32_init_rects (&region->rgn, pboxes, count))
  79         status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
  80
  81     if (pboxes != stack_pboxes)
  82         free (pboxes);
  83
  84     return status;
  85 }
  86
  87 void
  88 _cairo_region_fini (cairo_region_t *region)
  89 {
  90     pixman_region32_fini (&region->rgn);
  91 }
  92
  93 cairo_int_status_t
  94 _cairo_region_copy (cairo_region_t *dst, cairo_region_t *src)
  95 {
  96     if (!pixman_region32_copy (&dst->rgn, &src->rgn))
  97         return _cairo_error (CAIRO_STATUS_NO_MEMORY);
  98
  99     return CAIRO_STATUS_SUCCESS;
 100 }
 101
 102 int
 103 _cairo_region_num_boxes (cairo_region_t *region)
 104 {
 105     return pixman_region32_n_rects (&region->rgn);
 106 }
 107
 108 cairo_int_status_t
 109 _cairo_region_get_boxes (cairo_region_t *region, int *num_boxes, cairo_box_int_t **boxes)
 110 {
 111     int nboxes;
 112     pixman_box32_t *pboxes;
 113     cairo_box_int_t *cboxes;
 114     int i;
 115
 116     pboxes = pixman_region32_rectangles (&region->rgn, &nboxes);
 117
 118     if (nboxes == 0) {
 119         *num_boxes = 0;
 120         *boxes = NULL;
 121         return CAIRO_STATUS_SUCCESS;
 122     }
 123
 124     cboxes = _cairo_malloc_ab (nboxes, sizeof(cairo_box_int_t));
 125     if (cboxes == NULL)
 126         return _cairo_error (CAIRO_STATUS_NO_MEMORY);
 127
 128     for (i = 0; i < nboxes; i++) {
 129         cboxes[i].p1.x = pboxes[i].x1;
 130         cboxes[i].p1.y = pboxes[i].y1;
 131         cboxes[i].p2.x = pboxes[i].x2;
 132         cboxes[i].p2.y = pboxes[i].y2;
 133     }
 134
 135     *num_boxes = nboxes;
 136     *boxes = cboxes;
 137
 138     return CAIRO_STATUS_SUCCESS;
 139 }
 140
 141 void
 142 _cairo_region_boxes_fini (cairo_region_t *region, cairo_box_int_t *boxes)
 143 {
 144     free (boxes);
 145 }
 146
 147 /**
 148  * _cairo_region_get_extents:
 149  * @region: a #cairo_region_t
 150  * @rect: rectangle into which to store the extents
 151  *
 152  * Gets the bounding box of a region as a #cairo_rectangle_int_t
 153  **/
 154 void
 155 _cairo_region_get_extents (cairo_region_t *region, cairo_rectangle_int_t *extents)
 156 {
 157     pixman_box32_t *pextents = pixman_region32_extents (&region->rgn);
 158
 159     extents->x = pextents->x1;
 160     extents->y = pextents->y1;
 161     extents->width = pextents->x2 - pextents->x1;
 162     extents->height = pextents->y2 - pextents->y1;
 163 }
 164
 165 cairo_int_status_t
 166 _cairo_region_subtract (cairo_region_t *dst, cairo_region_t *a, cairo_region_t *b)
 167 {
 168     if (!pixman_region32_subtract (&dst->rgn, &a->rgn, &b->rgn))
 169         return _cairo_error (CAIRO_STATUS_NO_MEMORY);
 170
 171     return CAIRO_STATUS_SUCCESS;
 172 }
 173
 174 cairo_int_status_t
 175 _cairo_region_intersect (cairo_region_t *dst, cairo_region_t *a, cairo_region_t *b)
 176 {
 177     if (!pixman_region32_intersect (&dst->rgn, &a->rgn, &b->rgn))
 178         return _cairo_error (CAIRO_STATUS_NO_MEMORY);
 179
 180     return CAIRO_STATUS_SUCCESS;
 181 }
 182
 183 cairo_int_status_t
 184 _cairo_region_union_rect (cairo_region_t *dst,
 185                           cairo_region_t *src,
 186                           cairo_rectangle_int_t *rect)
 187 {
 188     if (!pixman_region32_union_rect (&dst->rgn, &src->rgn,
 189                                    rect->x, rect->y,
 190                                    rect->width, rect->height))
 191         return _cairo_error (CAIRO_STATUS_NO_MEMORY);
 192
 193     return CAIRO_STATUS_SUCCESS;
 194 }
 195
 196 cairo_bool_t
 197 _cairo_region_not_empty (cairo_region_t *region)
 198 {
 199     return (cairo_bool_t) pixman_region32_not_empty (&region->rgn);
 200 }
 201
 202 void
 203 _cairo_region_translate (cairo_region_t *region,
 204                          int x, int y)
 205 {
 206     pixman_region32_translate (&region->rgn, x, y);
 207 }
 208
 209 pixman_region_overlap_t
 210 _cairo_region_contains_rectangle (cairo_region_t *region,
 211                                   const cairo_rectangle_int_t *rect)
 212 {
 213     pixman_box32_t pbox;
 214
 215     pbox.x1 = rect->x;
 216     pbox.y1 = rect->y;
 217     pbox.x2 = rect->x + rect->width;
 218     pbox.y2 = rect->y + rect->height;
 219
 220     return pixman_region32_contains_rectangle (&region->rgn, &pbox);
 221 }