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1 #ifndef SEEN_LIBNRTYPE_FONT_INSTANCE_H
2 #define SEEN_LIBNRTYPE_FONT_INSTANCE_H
4 #include <ext/hash_map>
5 #include <pango/pango-types.h>
6 #include <pango/pango-font.h>
7 #include <require-config.h>
8 #include "FontFactory.h"
10 #include <libnr/nr-forward.h>
11 #include <libnrtype/nrtype-forward.h>
12 #include <libnrtype/font-style.h>
13 #include <livarot/livarot-forward.h>
15 // the font_instance are the template of several raster_font; they provide metrics and outlines
16 // that are drawn by the raster_font, so the raster_font needs info relative to the way the
17 // font need to be drawn. note that fontsize is a scale factor in the transform matrix
18 // of the style
19 // the various raster_font in use at a given time are held in a hash_map whose indices are the
20 // styles, hence the 2 following 'classes'
21 struct font_style_hash : public std::unary_function<font_style, size_t> {
22 size_t operator()(font_style const &x) const;
23 };
25 struct font_style_equal : public std::binary_function<font_style, font_style, bool> {
26 bool operator()(font_style const &a, font_style const &b);
27 };
29 class font_instance {
30 public:
31 // hashmap to get the raster_font for a given style
32 __gnu_cxx::hash_map<font_style, raster_font*, font_style_hash, font_style_equal> loadedStyles;
33 // the real source of the font
34 PangoFont* pFont;
35 // depending on the rendering backend, different temporary data
37 // that's the font's fingerprint; this particular PangoFontDescription gives the entry at which this font_instance
38 // resides in the font_factory loadedFaces hash_map
39 PangoFontDescription* descr;
40 // refcount
41 int refCount;
42 // font_factory owning this font_instance
43 font_factory* daddy;
45 // common glyph definitions for all the rasterfonts
46 __gnu_cxx::hash_map<int, int> id_to_no;
47 int nbGlyph, maxGlyph;
48 font_glyph* glyphs;
50 font_instance(void);
51 ~font_instance(void);
53 void Ref(void);
54 void Unref(void);
56 bool IsOutlineFont(void); // utility
57 void InstallFace(PangoFont* iFace); // utility; should reset the pFont field if loading failed
58 // in case the PangoFont is a bitmap font, for example. that way, the calling function
59 // will be able to check the validity of the font before installing it in loadedFaces
60 void InitTheFace();
62 int MapUnicodeChar(gunichar c); // calls the relevant unicode->glyph index function
63 void LoadGlyph(int glyph_id); // the main backend-dependent function
64 // loads the given glyph's info
66 // nota: all coordinates returned by these functions are on a [0..1] scale; you need to multiply
67 // by the fontsize to get the real sizes
68 Path* Outline(int glyph_id, Path *copyInto=NULL);
69 // queries the outline of the glyph (in livarot Path form), and copies it into copyInto instead
70 // of allocating a new Path if copyInto != NULL
71 void* ArtBPath(int glyph_id);
72 // returns the artbpath for this glyph. no refcounting needed, it's deallocated when the
73 // font_instance dies
74 double Advance(int glyph_id, bool vertical);
75 // nominal advance of the font.
76 bool FontMetrics(double &ascent, double &descent, double &leading);
77 bool FontSlope(double &run, double &rise);
78 // for generating slanted cursors for oblique fonts
79 NR::Rect BBox(int glyph_id);
81 // creates a rasterfont for the given style
82 raster_font* RasterFont(NR::Matrix const &trs, double stroke_width,
83 bool vertical = false, JoinType stroke_join = join_straight,
84 ButtType stroke_cap = butt_straight, float miter_limit = 4.0);
85 // the dashes array in iStyle is copied
86 raster_font* RasterFont(font_style const &iStyle);
87 // private use: tells the font_instance that the raster_font 'who' has died
88 void RemoveRasterFont(raster_font *who);
90 // attribute queries
91 unsigned Name(gchar *str, unsigned size);
92 unsigned PSName(gchar *str, unsigned size);
93 unsigned Family(gchar *str, unsigned size);
94 unsigned Attribute(gchar const *key, gchar *str, unsigned size);
96 private:
97 void FreeTheFace();
99 #ifdef USE_PANGO_WIN32
100 HFONT theFace;
101 #else
102 FT_Face theFace;
103 // it's a pointer in fact; no worries to ref/unref it, pango does its magic
104 // as long as pFont is valid, theFace is too
105 #endif
107 };
110 #endif /* !SEEN_LIBNRTYPE_FONT_INSTANCE_H */
112 /*
113 Local Variables:
114 mode:c++
115 c-file-style:"stroustrup"
116 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
117 indent-tabs-mode:nil
118 fill-column:99
119 End:
120 */
121 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :