2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 2005--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
6 LilyPond is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 LilyPond is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
23 interpret_stencil_expression (SCM expr,
24 SCM (*func) (void *, SCM),
30 if (!scm_is_pair (expr))
33 SCM head = scm_car (expr);
35 if (head == ly_symbol2scm ("delay-stencil-evaluation"))
37 interpret_stencil_expression (scm_force (scm_cadr (expr)), func, func_arg, o);
40 if (head == ly_symbol2scm ("footnote"))
42 if (head == ly_symbol2scm ("translate-stencil"))
44 o += ly_scm2offset (scm_cadr (expr));
45 expr = scm_caddr (expr);
47 else if (head == ly_symbol2scm ("combine-stencil"))
50 for (SCM x = scm_cdr (expr); scm_is_pair (x); x = scm_cdr (x))
51 interpret_stencil_expression (scm_car (x), func, func_arg, o);
54 else if (head == ly_symbol2scm ("grob-cause"))
56 SCM grob = scm_cadr (expr);
60 scm_list_3 (head, ly_quote_scm (ly_offset2scm (o)), grob));
61 interpret_stencil_expression (scm_caddr (expr), func, func_arg, o);
62 if (scm_is_true (link))
63 (*func) (func_arg, scm_list_1 (ly_symbol2scm ("no-origin")));
66 else if (head == ly_symbol2scm ("color"))
68 SCM color = scm_cadr (expr);
69 SCM r = scm_car (color);
70 SCM g = scm_cadr (color);
71 SCM b = scm_caddr (color);
73 (*func) (func_arg, scm_list_4 (ly_symbol2scm ("setcolor"), r, g, b));
74 interpret_stencil_expression (scm_caddr (expr), func, func_arg, o);
75 (*func) (func_arg, scm_list_1 (ly_symbol2scm ("resetcolor")));
79 else if (head == ly_symbol2scm ("id"))
81 SCM id = scm_cadr (expr);
83 (*func) (func_arg, scm_list_2 (ly_symbol2scm ("start-enclosing-id-node"), id));
84 interpret_stencil_expression (scm_caddr (expr), func, func_arg, o);
85 (*func) (func_arg, scm_list_1 (ly_symbol2scm ("end-enclosing-id-node")));
89 else if (head == ly_symbol2scm ("rotate-stencil"))
91 SCM args = scm_cadr (expr);
92 SCM angle = scm_car (args);
93 Offset tmp = o + robust_scm2offset (scm_cadr (args), Offset (0.0, 0.0));
95 SCM offset = ly_offset2scm (tmp);
96 SCM x = scm_car (offset);
97 SCM y = scm_cdr (offset);
99 (*func) (func_arg, scm_list_4 (ly_symbol2scm ("setrotation"), angle, x, y));
100 interpret_stencil_expression (scm_caddr (expr), func, func_arg, o);
101 (*func) (func_arg, scm_list_4 (ly_symbol2scm ("resetrotation"), angle, x, y));
105 else if (head == ly_symbol2scm ("scale-stencil"))
107 SCM args = scm_cadr (expr);
108 SCM x_scale = scm_car (args);
109 SCM y_scale = scm_cadr (args);
110 Offset unscaled = o.scale (Offset (1 / scm_to_double (x_scale),
111 1 / scm_to_double (y_scale)));
113 (*func) (func_arg, scm_list_3 (ly_symbol2scm ("setscale"), x_scale,
115 interpret_stencil_expression (scm_caddr (expr), func, func_arg,
117 (*func) (func_arg, scm_list_1 (ly_symbol2scm ("resetscale")));
124 scm_list_4 (ly_symbol2scm ("placebox"),
125 scm_from_double (o[X_AXIS]),
126 scm_from_double (o[Y_AXIS]),
139 find_font_function (void *fs, SCM x)
141 Font_list *me = (Font_list *) fs;
143 if (scm_car (x) == ly_symbol2scm ("placebox"))
145 SCM args = scm_cdr (x);
146 SCM what = scm_caddr (args);
148 if (scm_is_pair (what))
150 SCM head = scm_car (what);
151 if (ly_symbol2scm ("text") == head)
152 me->fonts_ = scm_cons (scm_cadr (what), me->fonts_);
153 else if (head == ly_symbol2scm ("char"))
154 me->fonts_ = scm_cons (scm_cadr (what), me->fonts_);
161 find_expression_fonts (SCM expr)
167 interpret_stencil_expression (expr, &find_font_function,
168 (void *) & fl, Offset (0, 0));