2 pango-font.cc -- implement Pango_font
4 source file of the GNU LilyPond music typesetter
6 (c) 2004 Han-Wen Nienhuys <hanwen@xs4all.nl>
11 #define PANGO_ENABLE_BACKEND // ugh, why necessary?
13 #include <pango/pangoft2.h>
17 #include "dimensions.hh"
18 #include "pango-font.hh"
24 Pango_font::Pango_font (PangoFT2FontMap *fontmap,
26 PangoFontDescription *description)
29 PangoDirection pango_dir = (dir == RIGHT)
31 : PANGO_DIRECTION_RTL;
33 pango_ft2_get_context (PANGO_RESOLUTION, PANGO_RESOLUTION);
35 pango_description_ = pango_font_description_copy (description);
36 // context_ = pango_ft2_font_map_create_context (fontmap);
37 attribute_list_= pango_attr_list_new();
40 urgh. I don't understand this. Why isn't this 1/(scale * resolution)
44 scale_ = INCH_TO_BP / (Real (PANGO_SCALE) * Real (PANGO_RESOLUTION));
46 pango_context_set_language (context_, pango_language_from_string ("en_US"));
47 pango_context_set_base_dir (context_, pango_dir);
48 pango_context_set_font_description (context_, description);
51 Pango_font::~Pango_font ()
53 pango_font_description_free (pango_description_);
54 g_object_unref (context_);
55 pango_attr_list_unref (attribute_list_);
59 Pango_font::register_font_file (String filename, String ps_name)
61 subfonts_ = scm_cons (scm_makfrom0str (filename.to_str0 ()),
66 Pango_font::derived_mark () const
68 scm_gc_mark (subfonts_);
72 Pango_font::pango_item_string_stencil (PangoItem *item, String str, Real dx) const
74 const int GLYPH_NAME_LEN = 256;
75 char glyph_name[GLYPH_NAME_LEN];
76 PangoAnalysis *pa = &(item->analysis);
77 PangoGlyphString *pgs = pango_glyph_string_new ();
79 pango_shape (str.to_str0 () + item->offset,
80 item->length, pa, pgs);
82 PangoRectangle logical_rect;
83 PangoRectangle ink_rect;
84 pango_glyph_string_extents (pgs, pa->font, &ink_rect, &logical_rect);
86 PangoFcFont *fcfont = G_TYPE_CHECK_INSTANCE_CAST(pa->font,
90 FT_Face ftface = pango_fc_font_lock_face (fcfont);
91 Box b (Interval (PANGO_LBEARING(logical_rect),
92 PANGO_RBEARING(logical_rect)),
93 Interval (-PANGO_DESCENT(logical_rect),
94 PANGO_ASCENT(logical_rect)));
98 SCM glyph_exprs = SCM_EOL;
99 SCM *tail = &glyph_exprs;
100 for (int i = 0; i < pgs->num_glyphs; i++)
102 PangoGlyphInfo *pgi = pgs->glyphs + i;
104 PangoGlyph pg = pgi->glyph;
105 PangoGlyphGeometry ggeo = pgi->geometry;
107 FT_Get_Glyph_Name (ftface, pg, glyph_name, GLYPH_NAME_LEN);
108 *tail = scm_cons (scm_list_3 (scm_from_double (ggeo.x_offset * scale_ + dx),
109 scm_from_double (ggeo.y_offset * scale_),
110 scm_makfrom0str (glyph_name)),
113 tail = SCM_CDRLOC (*tail);
116 PangoFontDescription *descr = pango_font_describe (pa->font);
117 Real size = pango_font_description_get_size (descr)
118 / (Real (PANGO_SCALE));
120 FcPattern *fcpat = fcfont->font_pattern;
122 FcPatternGetString(fcpat, FC_FILE, 0, (FcChar8 **) &filename);
123 char const *ps_name = FT_Get_Postscript_Name (ftface);
124 ((Pango_font *) this)->register_font_file (filename, ps_name);
125 pango_fc_font_unlock_face (fcfont);
127 SCM expr = scm_list_4 (ly_symbol2scm ("glyph-string"),
128 scm_makfrom0str (ps_name),
129 scm_from_double (size),
130 ly_quote_scm (glyph_exprs));
132 Stencil item_stencil (b, expr);
139 Pango_font::text_stencil (String str) const
141 GList *items = pango_itemize (context_,
143 0, str.length (), attribute_list_,
151 PangoItem *item = (PangoItem*) ptr->data;
153 Stencil item_stencil = pango_item_string_stencil (item, str, x);
155 x = item_stencil.extent (X_AXIS)[RIGHT];
157 dest.add_stencil (item_stencil);
162 if (output_backend_global != "ps")
165 For Pango based backends, we take a shortcut.
168 = scm_list_3 (ly_symbol2scm ("utf-8-string"),
169 scm_makfrom0str (pango_font_description_to_filename (pango_description_)),
170 scm_makfrom0str (str.to_str0 ()));
173 return Stencil (dest.extent_box (),
181 Pango_font::sub_fonts () const
187 Pango_font::font_file_name () const
192 LY_DEFINE (ly_pango_font_p, "ly:pango-font?",
195 "Is @var{f} a pango font?")
197 return scm_from_bool (dynamic_cast<Pango_font*> (unsmob_metrics (f)));