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746f66c3fc
This rectangle has regular integer values, not fixed-point values. So the old name was horribly wrong and misleading, (and yes I think it was even I that had suggested it).
85 lines
3.1 KiB
C
85 lines
3.1 KiB
C
/* 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 © 2006 Red Hat, Inc.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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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*/
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#include "cairoint.h"
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/* XXX We currently have a confusing mix of boxes and rectangles as
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* exemplified by this function. A cairo_box_t is a rectangular area
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* represented by the coordinates of the upper left and lower right
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* corners, expressed in fixed point numbers. A cairo_rectangle_int16_t is
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* also a rectangular area, but represented by the upper left corner
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* and the width and the height, as integer numbers.
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*
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* This function converts a cairo_box_t to a cairo_rectangle_int16_t by
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* increasing the area to the nearest integer coordinates. We should
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* standardize on cairo_rectangle_int16_t and cairo_rectangle_int16_t, and
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* this function could be renamed to the more reasonable
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* _cairo_rectangle_fixed_round.
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*/
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void
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_cairo_box_round_to_rectangle (cairo_box_t *box, cairo_rectangle_int16_t *rectangle)
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{
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rectangle->x = _cairo_fixed_integer_floor (box->p1.x);
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rectangle->y = _cairo_fixed_integer_floor (box->p1.y);
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rectangle->width = _cairo_fixed_integer_ceil (box->p2.x) - rectangle->x;
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rectangle->height = _cairo_fixed_integer_ceil (box->p2.y) - rectangle->y;
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}
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void
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_cairo_rectangle_intersect (cairo_rectangle_int16_t *dest, cairo_rectangle_int16_t *src)
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{
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int x1, y1, x2, y2;
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x1 = MAX (dest->x, src->x);
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y1 = MAX (dest->y, src->y);
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x2 = MIN (dest->x + dest->width, src->x + src->width);
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y2 = MIN (dest->y + dest->height, src->y + src->height);
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if (x1 >= x2 || y1 >= y2) {
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dest->x = 0;
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dest->y = 0;
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dest->width = 0;
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dest->height = 0;
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} else {
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dest->x = x1;
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dest->y = y1;
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dest->width = x2 - x1;
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dest->height = y2 - y1;
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}
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}
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