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,
30 PangoDirection pango_dir = (dir == RIGHT)
32 : PANGO_DIRECTION_RTL;
34 pango_ft2_get_context (PANGO_RESOLUTION, PANGO_RESOLUTION);
36 pango_description_ = pango_font_description_copy (description);
37 // context_ = pango_ft2_font_map_create_context (fontmap);
38 attribute_list_= pango_attr_list_new();
42 urgh. I don't understand this. Why isn't this 1/(scale *
43 resolution * output_scale)
47 scale_ = INCH_TO_BP / (Real (PANGO_SCALE) * Real (PANGO_RESOLUTION) * output_scale);
49 pango_context_set_language (context_, pango_language_from_string ("en_US"));
50 pango_context_set_base_dir (context_, pango_dir);
51 pango_context_set_font_description (context_, description);
54 Pango_font::~Pango_font ()
56 pango_font_description_free (pango_description_);
57 g_object_unref (context_);
58 pango_attr_list_unref (attribute_list_);
62 Pango_font::register_font_file (String filename, String ps_name)
64 subfonts_ = scm_cons (scm_makfrom0str (filename.to_str0 ()),
69 Pango_font::derived_mark () const
71 scm_gc_mark (subfonts_);
75 Pango_font::pango_item_string_stencil (PangoItem *item, String str, Real dx) const
77 const int GLYPH_NAME_LEN = 256;
78 char glyph_name[GLYPH_NAME_LEN];
79 PangoAnalysis *pa = &(item->analysis);
80 PangoGlyphString *pgs = pango_glyph_string_new ();
82 pango_shape (str.to_str0 () + item->offset,
83 item->length, pa, pgs);
85 PangoRectangle logical_rect;
86 PangoRectangle ink_rect;
87 pango_glyph_string_extents (pgs, pa->font, &ink_rect, &logical_rect);
89 PangoFcFont *fcfont = G_TYPE_CHECK_INSTANCE_CAST(pa->font,
93 FT_Face ftface = pango_fc_font_lock_face (fcfont);
94 Box b (Interval (PANGO_LBEARING(ink_rect),
95 PANGO_RBEARING(ink_rect)),
96 Interval (-PANGO_DESCENT(ink_rect),
97 PANGO_ASCENT(ink_rect)));
101 SCM glyph_exprs = SCM_EOL;
102 SCM *tail = &glyph_exprs;
103 for (int i = 0; i < pgs->num_glyphs; i++)
105 PangoGlyphInfo *pgi = pgs->glyphs + i;
107 PangoGlyph pg = pgi->glyph;
108 PangoGlyphGeometry ggeo = pgi->geometry;
110 FT_Get_Glyph_Name (ftface, pg, glyph_name, GLYPH_NAME_LEN);
111 *tail = scm_cons (scm_list_3 (scm_from_double (ggeo.x_offset * scale_ + dx),
112 scm_from_double (ggeo.y_offset * scale_),
113 scm_makfrom0str (glyph_name)),
116 tail = SCM_CDRLOC (*tail);
119 PangoFontDescription *descr = pango_font_describe (pa->font);
120 Real size = pango_font_description_get_size (descr)
121 / (Real (PANGO_SCALE));
123 FcPattern *fcpat = fcfont->font_pattern;
125 FcPatternGetString(fcpat, FC_FILE, 0, (FcChar8 **) &filename);
126 char const *ps_name = FT_Get_Postscript_Name (ftface);
127 ((Pango_font *) this)->register_font_file (filename, ps_name);
128 pango_fc_font_unlock_face (fcfont);
130 SCM expr = scm_list_4 (ly_symbol2scm ("glyph-string"),
131 scm_makfrom0str (ps_name),
132 scm_from_double (size),
133 ly_quote_scm (glyph_exprs));
135 Stencil item_stencil (b, expr);
142 Pango_font::text_stencil (String str) const
144 GList *items = pango_itemize (context_,
146 0, str.length (), attribute_list_,
154 PangoItem *item = (PangoItem*) ptr->data;
156 Stencil item_stencil = pango_item_string_stencil (item, str, x);
158 x = item_stencil.extent (X_AXIS)[RIGHT];
160 dest.add_stencil (item_stencil);
165 if (output_backend_global != "ps")
168 For Pango based backends, we take a shortcut.
171 = scm_list_3 (ly_symbol2scm ("utf8-string"),
172 scm_makfrom0str (pango_font_description_to_string (pango_description_)),
173 scm_makfrom0str (str.to_str0 ()));
176 Box b (Interval (0, 0), Interval (0, 0));
177 b.unite (dest.extent_box ());
178 return Stencil (b, exp);
183 if (!dest.extent_box ()[X_AXIS].is_empty ())
185 Stencil frame = Lookup::frame (dest.extent_box(), 0.1, 0.1);
186 dest.add_stencil (frame);
194 Pango_font::sub_fonts () const
200 Pango_font::font_file_name () const
205 LY_DEFINE (ly_pango_font_p, "ly:pango-font?",
208 "Is @var{f} a pango font?")
210 return scm_from_bool (dynamic_cast<Pango_font*> (unsmob_metrics (f)));