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/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2002 University of Southern California
* Copyright © 2005 Red Hat, Inc.
* Copyright © 2009 Chris Wilson
*
* 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
*
* 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 University of Southern
* California.
*
* Contributor(s):
* Carl D. Worth <cworth@cworth.org>
* Kristian Høgsberg <krh@redhat.com>
* Chris Wilson <chris@chris-wilson.co.uk>
*/
#include "cairoint.h"
#include "cairo-clip-private.h"
#include "cairo-error-private.h"
#include "cairo-freed-pool-private.h"
#include "cairo-gstate-private.h"
#include "cairo-path-fixed-private.h"
#include "cairo-pattern-private.h"
#include "cairo-composite-rectangles-private.h"
#include "cairo-region-private.h"
static void
_cairo_clip_extract_region (cairo_clip_t *clip)
{
cairo_rectangle_int_t stack_rects[CAIRO_STACK_ARRAY_LENGTH (cairo_rectangle_int_t)];
cairo_rectangle_int_t *r = stack_rects;
cairo_bool_t is_region;
int i;
if (clip->num_boxes == 0)
return;
if (clip->num_boxes > ARRAY_LENGTH (stack_rects)) {
r = _cairo_malloc_ab (clip->num_boxes, sizeof (cairo_rectangle_int_t));
if (r == NULL){
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
return;
}
}
is_region = clip->path == NULL;
for (i = 0; i < clip->num_boxes; i++) {
cairo_box_t *b = &clip->boxes[i];
if (is_region)
is_region =
_cairo_fixed_is_integer (b->p1.x | b->p1.y | b->p2.x | b->p2.y);
r[i].x = _cairo_fixed_integer_floor (b->p1.x);
r[i].y = _cairo_fixed_integer_floor (b->p1.y);
r[i].width = _cairo_fixed_integer_ceil (b->p2.x) - r[i].x;
r[i].height = _cairo_fixed_integer_ceil (b->p2.y) - r[i].y;
}
clip->is_region = is_region;
clip->region = cairo_region_create_rectangles (r, i);
if (r != stack_rects)
free (r);
}
cairo_region_t *
_cairo_clip_get_region (const cairo_clip_t *clip)
{
if (clip == NULL)
return NULL;
if (clip->region == NULL)
_cairo_clip_extract_region ((cairo_clip_t *) clip);
return clip->region;
}
cairo_bool_t
_cairo_clip_is_region (const cairo_clip_t *clip)
{
if (clip == NULL)
return TRUE;
if (clip->is_region)
return TRUE;
/* XXX Geometric reduction? */
if (clip->path)
return FALSE;
if (clip->num_boxes == 0)
return TRUE;
if (clip->region == NULL)
_cairo_clip_extract_region ((cairo_clip_t *) clip);
return clip->is_region;
}