2 text-metrics.cc -- implement text metric lookup functions
4 source file of the GNU LilyPond music typesetter
6 (c) 2004 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "dimensions.hh"
10 #include "font-metric.hh"
13 static SCM text_dimension_hash_tab;
17 lookup_tex_text_dimension (Font_metric *font,
22 SCM limit = ly_lily_module_constant ("TEX_STRING_HASHLIMIT");
23 String key_str = ly_scm2string (font->font_file_name());
24 int hash_code = scm_to_int (scm_hash (text, limit));
25 key_str = to_string (hash_code) + key_str;
28 if (text_dimension_hash_tab)
30 scm_hash_ref (text_dimension_hash_tab,
31 scm_makfrom0str (key_str.to_str0 ()),
34 if (scm_is_pair (val))
36 b[X_AXIS][LEFT] = 0.0;
37 b[X_AXIS][RIGHT] = scm_to_double (scm_car (val)) * point_constant;
39 b[Y_AXIS][UP] = scm_to_double (scm_car (val)) * point_constant;
41 b[Y_AXIS][DOWN] = scm_to_double (scm_car (val)) * point_constant;
49 LY_DEFINE(ly_load_text_dimensions, "ly:load-text-dimensions",
51 (SCM dimension_alist),
52 "Load dimensions from TeX in a (KEY . (W H D)) format alist")
54 if (!text_dimension_hash_tab)
56 text_dimension_hash_tab =
57 scm_gc_protect_object (scm_make_hash_table (scm_from_int (113)));
60 for (SCM s = dimension_alist;
64 SCM key = scm_caar (s);
65 SCM val = scm_cdar (s);
67 if (scm_hash_ref (text_dimension_hash_tab, key, SCM_BOOL_F)
70 scm_hash_set_x (text_dimension_hash_tab, key, val);
74 return SCM_UNSPECIFIED;
78 try_load_text_metrics (String basename)
80 String path = global_path.find_file (basename + ".textmetrics");
83 String contents (gulp_file_to_string (path));
84 contents = "(quote (" + contents + "))";
86 SCM lst = scm_c_eval_string (contents.to_str0 ());
87 ly_load_text_dimensions (lst);