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);
50 pango_context_set_language (context_, pango_language_from_string ("en_US"));
51 pango_context_set_base_dir (context_, pango_dir);
52 pango_context_set_font_description (context_, description);
55 Pango_font::~Pango_font ()
57 pango_font_description_free (pango_description_);
58 g_object_unref (context_);
59 pango_attr_list_unref (attribute_list_);
63 Pango_font::register_font_file (String filename, String ps_name)
65 scm_hash_set_x (physical_font_tab_,
66 scm_makfrom0str (ps_name.to_str0()),
67 scm_makfrom0str (filename.to_str0()));
71 Pango_font::derived_mark () const
73 scm_gc_mark (physical_font_tab_);
77 Pango_font::pango_item_string_stencil (PangoItem *item, String str, Real dx) const
79 const int GLYPH_NAME_LEN = 256;
80 char glyph_name[GLYPH_NAME_LEN];
81 PangoAnalysis *pa = &(item->analysis);
82 PangoGlyphString *pgs = pango_glyph_string_new ();
84 pango_shape (str.to_str0 () + item->offset,
85 item->length, pa, pgs);
87 PangoRectangle logical_rect;
88 PangoRectangle ink_rect;
89 pango_glyph_string_extents (pgs, pa->font, &ink_rect, &logical_rect);
91 PangoFcFont *fcfont = G_TYPE_CHECK_INSTANCE_CAST(pa->font,
95 FT_Face ftface = pango_fc_font_lock_face (fcfont);
96 Box b (Interval (PANGO_LBEARING(ink_rect),
97 PANGO_RBEARING(ink_rect)),
98 Interval (-PANGO_DESCENT(ink_rect),
99 PANGO_ASCENT(ink_rect)));
103 SCM glyph_exprs = SCM_EOL;
104 SCM *tail = &glyph_exprs;
105 for (int i = 0; i < pgs->num_glyphs; i++)
107 PangoGlyphInfo *pgi = pgs->glyphs + i;
109 PangoGlyph pg = pgi->glyph;
110 PangoGlyphGeometry ggeo = pgi->geometry;
112 FT_Get_Glyph_Name (ftface, pg, glyph_name, GLYPH_NAME_LEN);
113 *tail = scm_cons (scm_list_3 (scm_from_double (ggeo.x_offset * scale_ + dx),
114 scm_from_double (ggeo.y_offset * scale_),
115 scm_makfrom0str (glyph_name)),
118 tail = SCM_CDRLOC (*tail);
121 PangoFontDescription *descr = pango_font_describe (pa->font);
122 Real size = pango_font_description_get_size (descr)
123 / (Real (PANGO_SCALE));
125 FcPattern *fcpat = fcfont->font_pattern;
127 FcPatternGetString(fcpat, FC_FILE, 0, (FcChar8 **) &filename);
128 char const *ps_name = FT_Get_Postscript_Name (ftface);
132 ((Pango_font *) this)->register_font_file (filename, ps_name);
133 pango_fc_font_unlock_face (fcfont);
135 SCM expr = scm_list_4 (ly_symbol2scm ("glyph-string"),
136 scm_makfrom0str (ps_name),
137 scm_from_double (size),
138 ly_quote_scm (glyph_exprs));
140 return Stencil (b, expr);
144 warning (_ ("FreeType face has no PostScript font name."));
150 Pango_font::physical_font_tab () const
152 return physical_font_tab_;
158 Pango_font::text_stencil (String str) const
160 GList *items = pango_itemize (context_,
162 0, str.length (), attribute_list_,
170 PangoItem *item = (PangoItem*) ptr->data;
172 Stencil item_stencil = pango_item_string_stencil (item, str, x);
174 x = item_stencil.extent (X_AXIS)[RIGHT];
176 dest.add_stencil (item_stencil);
182 UGH. Should have flags per output format signifying supported
185 if (output_backend_global != "ps"
186 && output_backend_global != "eps")
189 For Pango based backends, we take a shortcut.
192 = scm_list_3 (ly_symbol2scm ("utf8-string"),
193 scm_makfrom0str (pango_font_description_to_string (pango_description_)),
194 scm_makfrom0str (str.to_str0 ()));
197 Box b (Interval (0, 0), Interval (0, 0));
198 b.unite (dest.extent_box ());
199 return Stencil (b, exp);
204 if (!dest.extent_box ()[X_AXIS].is_empty ())
206 Stencil frame = Lookup::frame (dest.extent_box(), 0.1, 0.1);
207 dest.add_stencil (frame);
216 Pango_font::font_file_name () const