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lightning-sunbird  0.9+nobinonly
cairo-fixed.c
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00001 /* cairo - a vector graphics library with display and print output
00002  *
00003  * Copyright © 2003 University of Southern California
00004  *
00005  * This library is free software; you can redistribute it and/or
00006  * modify it either under the terms of the GNU Lesser General Public
00007  * License version 2.1 as published by the Free Software Foundation
00008  * (the "LGPL") or, at your option, under the terms of the Mozilla
00009  * Public License Version 1.1 (the "MPL"). If you do not alter this
00010  * notice, a recipient may use your version of this file under either
00011  * the MPL or the LGPL.
00012  *
00013  * You should have received a copy of the LGPL along with this library
00014  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
00015  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
00016  * You should have received a copy of the MPL along with this library
00017  * in the file COPYING-MPL-1.1
00018  *
00019  * The contents of this file are subject to the Mozilla Public License
00020  * Version 1.1 (the "License"); you may not use this file except in
00021  * compliance with the License. You may obtain a copy of the License at
00022  * http://www.mozilla.org/MPL/
00023  *
00024  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
00025  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
00026  * the specific language governing rights and limitations.
00027  *
00028  * The Original Code is the cairo graphics library.
00029  *
00030  * The Initial Developer of the Original Code is University of Southern
00031  * California.
00032  *
00033  * Contributor(s):
00034  *     Carl D. Worth <cworth@cworth.org>
00035  */
00036 
00037 #include "cairoint.h"
00038 
00039 cairo_fixed_t
00040 _cairo_fixed_from_int (int i)
00041 {
00042     return i << 16;
00043 }
00044 
00045 cairo_fixed_t
00046 _cairo_fixed_from_double (double d)
00047 {
00048     return (cairo_fixed_t) floor (d * 65536 + 0.5);
00049 }
00050 
00051 cairo_fixed_t
00052 _cairo_fixed_from_26_6 (uint32_t i)
00053 {
00054     return i << 10;
00055 }
00056 
00057 double
00058 _cairo_fixed_to_double (cairo_fixed_t f)
00059 {
00060     return ((double) f) / 65536.0;
00061 }
00062 
00063 int
00064 _cairo_fixed_is_integer (cairo_fixed_t f)
00065 {
00066     return (f & 0xFFFF) == 0;
00067 }
00068 
00069 int
00070 _cairo_fixed_integer_part (cairo_fixed_t f)
00071 {
00072     return f >> 16;
00073 }
00074 
00075 int
00076 _cairo_fixed_integer_floor (cairo_fixed_t f)
00077 {
00078     if (f >= 0)
00079        return f >> 16;
00080     else
00081        return -((-f - 1) >> 16) - 1;
00082 }
00083 
00084 int
00085 _cairo_fixed_integer_ceil (cairo_fixed_t f)
00086 {
00087     if (f > 0)
00088        return ((f - 1)>>16) + 1;
00089     else
00090        return - (-f >> 16);
00091 }