2 pango-font.cc -- implement Pango_font
4 source file of the GNU LilyPond music typesetter
6 (c) 2004--2005 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"
25 Pango_font::Pango_font (PangoFT2FontMap *fontmap,
27 PangoFontDescription *description,
30 physical_font_tab_ = scm_c_make_hash_table (11);
31 PangoDirection pango_dir = (dir == RIGHT)
33 : PANGO_DIRECTION_RTL;
35 pango_ft2_get_context (PANGO_RESOLUTION, PANGO_RESOLUTION);
37 pango_description_ = pango_font_description_copy (description);
38 // context_ = pango_ft2_font_map_create_context (fontmap);
39 attribute_list_= pango_attr_list_new();
43 urgh. I don't understand this. Why isn't this 1/(scale *
44 resolution * output_scale)
48 scale_ = INCH_TO_BP / (Real (PANGO_SCALE) * Real (PANGO_RESOLUTION) * output_scale);
51 ugh. Should make this configurable.
53 pango_context_set_language (context_, pango_language_from_string ("en_US"));
54 pango_context_set_base_dir (context_, pango_dir);
55 pango_context_set_font_description (context_, description);
58 Pango_font::~Pango_font ()
60 pango_font_description_free (pango_description_);
61 g_object_unref (context_);
62 pango_attr_list_unref (attribute_list_);
66 Pango_font::register_font_file (String filename, String ps_name)
68 scm_hash_set_x (physical_font_tab_,
69 scm_makfrom0str (ps_name.to_str0()),
70 scm_makfrom0str (filename.to_str0()));
74 Pango_font::derived_mark () const
76 scm_gc_mark (physical_font_tab_);
80 Pango_font::pango_item_string_stencil (PangoItem *item, String str, Real dx) const
82 const int GLYPH_NAME_LEN = 256;
83 char glyph_name[GLYPH_NAME_LEN];
84 PangoAnalysis *pa = &(item->analysis);
85 PangoGlyphString *pgs = pango_glyph_string_new ();
87 pango_shape (str.to_str0 () + item->offset,
88 item->length, pa, pgs);
90 PangoRectangle logical_rect;
91 PangoRectangle ink_rect;
92 pango_glyph_string_extents (pgs, pa->font, &ink_rect, &logical_rect);
94 PangoFcFont *fcfont = G_TYPE_CHECK_INSTANCE_CAST(pa->font,
98 FT_Face ftface = pango_fc_font_lock_face (fcfont);
99 Box b (Interval (PANGO_LBEARING(ink_rect),
100 PANGO_RBEARING(ink_rect)),
101 Interval (-PANGO_DESCENT(ink_rect),
102 PANGO_ASCENT(ink_rect)));
106 SCM glyph_exprs = SCM_EOL;
107 SCM *tail = &glyph_exprs;
108 for (int i = 0; i < pgs->num_glyphs; i++)
110 PangoGlyphInfo *pgi = pgs->glyphs + i;
112 PangoGlyph pg = pgi->glyph;
113 PangoGlyphGeometry ggeo = pgi->geometry;
115 FT_Get_Glyph_Name (ftface, pg, glyph_name, GLYPH_NAME_LEN);
116 *tail = scm_cons (scm_list_3 (scm_from_double (ggeo.x_offset * scale_ + dx),
117 scm_from_double (ggeo.y_offset * scale_),
118 scm_makfrom0str (glyph_name)),
121 tail = SCM_CDRLOC (*tail);
124 PangoFontDescription *descr = pango_font_describe (pa->font);
125 Real size = pango_font_description_get_size (descr)
126 / (Real (PANGO_SCALE));
128 FcPattern *fcpat = fcfont->font_pattern;
130 FcPatternGetString(fcpat, FC_FILE, 0, (FcChar8 **) &filename);
131 char const *ps_name = FT_Get_Postscript_Name (ftface);
135 ((Pango_font *) this)->register_font_file (filename, ps_name);
136 pango_fc_font_unlock_face (fcfont);
138 SCM expr = scm_list_4 (ly_symbol2scm ("glyph-string"),
139 scm_makfrom0str (ps_name),
140 scm_from_double (size),
141 ly_quote_scm (glyph_exprs));
143 return Stencil (b, expr);
147 warning (_ ("FreeType face has no PostScript font name."));
153 Pango_font::physical_font_tab () const
155 return physical_font_tab_;
161 Pango_font::text_stencil (String str) const
163 GList *items = pango_itemize (context_,
165 0, str.length (), attribute_list_,
173 PangoItem *item = (PangoItem*) ptr->data;
175 Stencil item_stencil = pango_item_string_stencil (item, str, x);
177 x = item_stencil.extent (X_AXIS)[RIGHT];
179 dest.add_stencil (item_stencil);
185 UGH. Should have flags per output format signifying supported
188 if (output_backend_global != "ps"
189 && output_backend_global != "eps")
192 For Pango based backends, we take a shortcut.
195 = scm_list_3 (ly_symbol2scm ("utf8-string"),
196 scm_makfrom0str (pango_font_description_to_string (pango_description_)),
197 scm_makfrom0str (str.to_str0 ()));
200 Box b (Interval (0, 0), Interval (0, 0));
201 b.unite (dest.extent_box ());
202 return Stencil (b, exp);
207 if (!dest.extent_box ()[X_AXIS].is_empty ())
209 Stencil frame = Lookup::frame (dest.extent_box(), 0.1, 0.1);
210 dest.add_stencil (frame);
219 Pango_font::font_file_name () const