2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
5 Jan Nieuwenhuizen <janneke@gnu.org>
7 LilyPond is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 LilyPond is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
25 Return the 2-log, rounded down
45 return log (x) / log (2.0);
49 directed_round (Real f, Direction d)
58 0 at threshold, 1 at 0, with 1/x falloff.
61 peak_around (Real epsilon, Real threshold, Real x)
65 return max (- epsilon * (x - threshold) / ((x + epsilon) * threshold), 0.0);
69 0 at 0, 1 at standard_x, and increasing thereafter.
72 convex_amplifier (Real standard_x, Real increase_factor, Real x)
74 return (exp (increase_factor * x / standard_x) - 1.0) / (exp (increase_factor) - 1.0);
78 camel_case_to_lisp_identifier (string in)
82 /* don't add '-' before first character */
83 out.push_back (char (tolower (in[0])));
85 for (size_t inpos = 1; inpos < in.size (); inpos++)
87 if (isupper (in[inpos]))
89 out.push_back ( char (tolower (in[inpos])));
92 string result (&out[0], out.size ());
93 replace_all (&result, '_', '-');
99 utf8_char_len (char current)
103 // U+10000 - U+10FFFF
104 if ((current & 0xF0) == 0xF0)
107 else if ((current & 0xE0) == 0xE0)
110 else if ((current & 0xC0) == 0xC0)
112 else if (current & 0x80)
113 programming_error ("invalid UTF-8 string");