forked from KolibriOS/kolibrios
124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
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/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2002 University of Southern California
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* Copyright © 2005 Red Hat, Inc.
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* Copyright © 2009 Chris Wilson
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is University of Southern
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* California.
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*
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* Contributor(s):
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* Carl D. Worth <cworth@cworth.org>
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* Kristian Høgsberg <krh@redhat.com>
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* Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#include "cairoint.h"
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#include "cairo-clip-private.h"
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#include "cairo-error-private.h"
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#include "cairo-freed-pool-private.h"
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#include "cairo-gstate-private.h"
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#include "cairo-path-fixed-private.h"
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#include "cairo-pattern-private.h"
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#include "cairo-composite-rectangles-private.h"
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#include "cairo-region-private.h"
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static void
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_cairo_clip_extract_region (cairo_clip_t *clip)
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{
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cairo_rectangle_int_t stack_rects[CAIRO_STACK_ARRAY_LENGTH (cairo_rectangle_int_t)];
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cairo_rectangle_int_t *r = stack_rects;
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cairo_bool_t is_region;
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int i;
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if (clip->num_boxes == 0)
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return;
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if (clip->num_boxes > ARRAY_LENGTH (stack_rects)) {
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r = _cairo_malloc_ab (clip->num_boxes, sizeof (cairo_rectangle_int_t));
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if (r == NULL){
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_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
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return;
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}
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}
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is_region = clip->path == NULL;
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for (i = 0; i < clip->num_boxes; i++) {
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cairo_box_t *b = &clip->boxes[i];
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if (is_region)
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is_region =
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_cairo_fixed_is_integer (b->p1.x | b->p1.y | b->p2.x | b->p2.y);
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r[i].x = _cairo_fixed_integer_floor (b->p1.x);
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r[i].y = _cairo_fixed_integer_floor (b->p1.y);
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r[i].width = _cairo_fixed_integer_ceil (b->p2.x) - r[i].x;
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r[i].height = _cairo_fixed_integer_ceil (b->p2.y) - r[i].y;
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}
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clip->is_region = is_region;
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clip->region = cairo_region_create_rectangles (r, i);
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if (r != stack_rects)
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free (r);
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}
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cairo_region_t *
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_cairo_clip_get_region (const cairo_clip_t *clip)
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{
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if (clip == NULL)
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return NULL;
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if (clip->region == NULL)
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_cairo_clip_extract_region ((cairo_clip_t *) clip);
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return clip->region;
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}
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cairo_bool_t
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_cairo_clip_is_region (const cairo_clip_t *clip)
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{
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if (clip == NULL)
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return TRUE;
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if (clip->is_region)
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return TRUE;
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/* XXX Geometric reduction? */
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if (clip->path)
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return FALSE;
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if (clip->num_boxes == 0)
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return TRUE;
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if (clip->region == NULL)
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_cairo_clip_extract_region ((cairo_clip_t *) clip);
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return clip->is_region;
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}
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