1 #ifndef SEEN_LIBNRTYPE_FONT_INSTANCE_H
2 #define SEEN_LIBNRTYPE_FONT_INSTANCE_H
4 #include <tr1/unordered_map>
5 #include <map>
6 #include <pango/pango-types.h>
7 #include <pango/pango-font.h>
8 #include <require-config.h>
9 #include "FontFactory.h"
11 #include <libnr/nr-forward.h>
12 #include <libnrtype/nrtype-forward.h>
13 #include <libnrtype/font-style.h>
14 #include <livarot/livarot-forward.h>
15 #include "libnr/nr-rect.h"
16 #include <2geom/d2.h>
18 // the font_instance are the template of several raster_font; they provide metrics and outlines
19 // that are drawn by the raster_font, so the raster_font needs info relative to the way the
20 // font need to be drawn. note that fontsize is a scale factor in the transform matrix
21 // of the style
22 // the various raster_font in use at a given time are held in a hash_map whose indices are the
23 // styles, hence the 2 following 'classes'
24 struct font_style_hash : public std::unary_function<font_style, size_t> {
25 size_t operator()(font_style const &x) const;
26 };
28 struct font_style_equal : public std::binary_function<font_style, font_style, bool> {
29 bool operator()(font_style const &a, font_style const &b) const;
30 };
32 class font_instance {
33 public:
34 // hashmap to get the raster_font for a given style
35 std::tr1::unordered_map<font_style, raster_font*, font_style_hash, font_style_equal> loadedStyles;
36 // the real source of the font
37 PangoFont* pFont;
38 // depending on the rendering backend, different temporary data
40 // that's the font's fingerprint; this particular PangoFontDescription gives the entry at which this font_instance
41 // resides in the font_factory loadedFaces hash_map
42 PangoFontDescription* descr;
43 // refcount
44 int refCount;
45 // font_factory owning this font_instance
46 font_factory* daddy;
48 // common glyph definitions for all the rasterfonts
49 std::map<int, int> id_to_no;
50 int nbGlyph, maxGlyph;
51 font_glyph* glyphs;
53 font_instance(void);
54 virtual ~font_instance(void);
56 void Ref(void);
57 void Unref(void);
59 bool IsOutlineFont(void); // utility
60 void InstallFace(PangoFont* iFace); // utility; should reset the pFont field if loading failed
61 // in case the PangoFont is a bitmap font, for example. that way, the calling function
62 // will be able to check the validity of the font before installing it in loadedFaces
63 void InitTheFace();
65 int MapUnicodeChar(gunichar c); // calls the relevant unicode->glyph index function
66 void LoadGlyph(int glyph_id); // the main backend-dependent function
67 // loads the given glyph's info
69 // nota: all coordinates returned by these functions are on a [0..1] scale; you need to multiply
70 // by the fontsize to get the real sizes
71 Path* Outline(int glyph_id, Path *copyInto=NULL);
72 // queries the outline of the glyph (in livarot Path form), and copies it into copyInto instead
73 // of allocating a new Path if copyInto != NULL
74 Geom::PathVector* PathVector(int glyph_id);
75 // returns the 2geom-type pathvector for this glyph. no refcounting needed, it's deallocated when the font_instance dies
76 double Advance(int glyph_id, bool vertical);
77 // nominal advance of the font.
78 bool FontMetrics(double &ascent, double &descent, double &leading);
79 bool FontSlope(double &run, double &rise);
80 // for generating slanted cursors for oblique fonts
81 Geom::OptRect BBox(int glyph_id);
83 // creates a rasterfont for the given style
84 raster_font* RasterFont(Geom::Matrix const &trs, double stroke_width,
85 bool vertical = false, JoinType stroke_join = join_straight,
86 ButtType stroke_cap = butt_straight, float miter_limit = 4.0);
87 // the dashes array in iStyle is copied
88 raster_font* RasterFont(font_style const &iStyle);
89 // private use: tells the font_instance that the raster_font 'who' has died
90 void RemoveRasterFont(raster_font *who);
92 // attribute queries
93 unsigned Name(gchar *str, unsigned size);
94 unsigned PSName(gchar *str, unsigned size);
95 unsigned Family(gchar *str, unsigned size);
96 unsigned Attribute(gchar const *key, gchar *str, unsigned size);
98 private:
99 void FreeTheFace();
101 #ifdef USE_PANGO_WIN32
102 HFONT theFace;
103 #else
104 FT_Face theFace;
105 // it's a pointer in fact; no worries to ref/unref it, pango does its magic
106 // as long as pFont is valid, theFace is too
107 #endif
109 };
112 #endif /* !SEEN_LIBNRTYPE_FONT_INSTANCE_H */
114 /*
115 Local Variables:
116 mode:c++
117 c-file-style:"stroustrup"
118 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
119 indent-tabs-mode:nil
120 fill-column:99
121 End:
122 */
123 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :