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/* cairo - a vector graphics library with display and print output
*
* Copyright © 2002 University of Southern California
* Copyright © 2005 Red Hat, Inc.
* Copyright © 2006 Red Hat, Inc.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
* http://www.mozilla.org/MPL/
*
* 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>
*/
#include "cairoint.h"
/* XXX We currently have a confusing mix of boxes and rectangles as
* exemplified by this function. A cairo_box_t is a rectangular area
* represented by the coordinates of the upper left and lower right
* corners, expressed in fixed point numbers. A cairo_rectangle_int16_t is
* also a rectangular area, but represented by the upper left corner
* and the width and the height, as integer numbers.
*
* This function converts a cairo_box_t to a cairo_rectangle_int16_t by
* increasing the area to the nearest integer coordinates. We should
* standardize on cairo_rectangle_int16_t and cairo_rectangle_int16_t, and
* this function could be renamed to the more reasonable
* _cairo_rectangle_fixed_round.
*/
void
_cairo_box_round_to_rectangle (cairo_box_t *box, cairo_rectangle_int16_t *rectangle)
{
rectangle->x = _cairo_fixed_integer_floor (box->p1.x);
rectangle->y = _cairo_fixed_integer_floor (box->p1.y);
rectangle->width = _cairo_fixed_integer_ceil (box->p2.x) - rectangle->x;
rectangle->height = _cairo_fixed_integer_ceil (box->p2.y) - rectangle->y;
}
void
_cairo_rectangle_intersect (cairo_rectangle_int16_t *dest, cairo_rectangle_int16_t *src)
{
int x1, y1, x2, y2;
x1 = MAX (dest->x, src->x);
y1 = MAX (dest->y, src->y);
x2 = MIN (dest->x + dest->width, src->x + src->width);
y2 = MIN (dest->y + dest->height, src->y + src->height);
if (x1 >= x2 || y1 >= y2) {
dest->x = 0;
dest->y = 0;
dest->width = 0;
dest->height = 0;
} else {
dest->x = x1;
dest->y = y1;
dest->width = x2 - x1;
dest->height = y2 - y1;
}
}
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