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/cvs/cf.schmorp.de/Deliantra-Client/pangoopengl.h
Revision: 1.1
Committed: Tue Jul 4 23:23:32 2006 UTC (18 years ago) by root
Content type: text/plain
Branch: MAIN
Log Message:
Get rid of cairo completely (yay!) and of ft2 factually (still need the
library as it included pangofc), by introducing a custom pango opengl
renderer.

Text rendering now no longer requires the distinction between rgba and
grayscale modes, requires much less texture space and memory, and is
faster on accelerated hardware (and possibly with software rendering, too).

All at the cost of only 1200 lines or so.

File Contents

# User Rev Content
1 root 1.1 /* Pango
2     * pangoopengl.h: OpenGL/Freetype2 backend
3     *
4     * Copyright (C) 1999 Red Hat Software
5     * Copyright (C) 2000 Tor Lillqvist
6     * Copyright (C) 2006 Marc Lehmann <pcg@goof.com>
7     *
8     * This file is free software; you can redistribute it and/or
9     * modify it under the terms of the GNU Library General Public
10     * License as published by the Free Software Foundation; either
11     * version 2 of the License, or (at your option) any later version.
12     *
13     * This file is distributed in the hope that it will be useful,
14     * but WITHOUT ANY WARRANTY; without even the implied warranty of
15     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16     * Library General Public License for more details.
17     *
18     * You should have received a copy of the GNU Library General Public
19     * License along with this library; if not, write to the
20     * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21     * Boston, MA 02111-1307, USA.
22     */
23    
24     #ifndef PANGOOPENGL_H__
25     #define PANGOOPENGL_H__
26    
27     #include <glib-object.h>
28    
29     #include <fontconfig/fontconfig.h>
30    
31     #include <pango/pango-layout.h>
32     #include <pango/pangofc-font.h>
33    
34     G_BEGIN_DECLS
35    
36     #define PANGO_TYPE_OPENGL_FONT_MAP (pango_opengl_font_map_get_type ())
37     #define PANGO_OPENGL_FONT_MAP(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_OPENGL_FONT_MAP, PangoOpenGLFontMap))
38     #define PANGO_OPENGL_IS_FONT_MAP(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), PANGO_TYPE_OPENGL_FONT_MAP))
39    
40     typedef struct _PangoOpenGLFontMap PangoOpenGLFontMap;
41     typedef struct _PangoOpenGLFont PangoOpenGLFont;
42     typedef struct _PangoOpenGLGlyphInfo PangoOpenGLGlyphInfo;
43     typedef struct _PangoOpenGLRenderer PangoOpenGLRenderer;
44     typedef struct _PangoOpenGLFontMapClass PangoOpenGLFontMapClass;
45    
46     typedef void (*PangoOpenGLSubstituteFunc) (FcPattern *pattern, gpointer data);
47    
48     /* Calls for applications */
49    
50     void
51     pango_opengl_render_layout_subpixel (PangoLayout *layout,
52     int x, int y,
53     float r, float g, float b, float a);
54    
55     void
56     pango_opengl_render_layout (PangoLayout *layout,
57     int x, int y,
58     float r, float g, float b, float a);
59    
60     GType pango_opengl_font_map_get_type (void);
61    
62     PangoFontMap *pango_opengl_font_map_new (void);
63     void pango_opengl_font_map_set_default_substitute (PangoOpenGLFontMap *fontmap,
64     PangoOpenGLSubstituteFunc func,
65     gpointer data,
66     GDestroyNotify notify);
67     void pango_opengl_font_map_substitute_changed (PangoOpenGLFontMap *fontmap);
68     PangoContext *pango_opengl_font_map_create_context (PangoOpenGLFontMap *fontmap);
69    
70     struct _PangoOpenGLFont
71     {
72     PangoFcFont font;
73    
74     FT_Face face;
75     int load_flags;
76    
77     int size;
78    
79     GSList *metrics_by_lang;
80    
81     GHashTable *glyph_info;
82     GDestroyNotify glyph_cache_destroy;
83     };
84    
85     struct _PangoOpenGLGlyphInfo
86     {
87     PangoRectangle logical_rect;
88     PangoRectangle ink_rect;
89     void *cached_glyph;
90     };
91    
92     #define PANGO_TYPE_OPENGL_FONT (pango_opengl_font_get_type ())
93     #define PANGO_OPENGL_FONT(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_OPENGL_FONT, PangoOpenGLFont))
94     #define PANGO_OPENGL_IS_FONT(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), PANGO_TYPE_OPENGL_FONT))
95    
96     #define PANGO_SCALE_26_6 (PANGO_SCALE / (1<<6))
97     #define PANGO_PIXELS_26_6(d) \
98     (((d) >= 0) ? \
99     ((d) + PANGO_SCALE_26_6 / 2) / PANGO_SCALE_26_6 : \
100     ((d) - PANGO_SCALE_26_6 / 2) / PANGO_SCALE_26_6)
101     #define PANGO_UNITS_26_6(d) (PANGO_SCALE_26_6 * (d))
102    
103     GType pango_opengl_font_get_type (void);
104    
105     PangoOpenGLFont *_pango_opengl_font_new (PangoOpenGLFontMap *fontmap, FcPattern *pattern);
106     FT_Library _pango_opengl_font_map_get_library (PangoFontMap *fontmap);
107    
108     void *_pango_opengl_font_get_cache_glyph_data (PangoFont *font, int glyph_index);
109     void _pango_opengl_font_set_cache_glyph_data (PangoFont *font, int glyph_index, void *cached_glyph);
110     void _pango_opengl_font_set_glyph_cache_destroy (PangoFont *font, GDestroyNotify destroy_notify);
111    
112     #define PANGO_TYPE_OPENGL_RENDERER (pango_opengl_renderer_get_type())
113     #define PANGO_OPENGL_RENDERER(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_OPENGL_RENDERER, PangoOpenGLRenderer))
114     #define PANGO_IS_OPENGL_RENDERER(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), PANGO_TYPE_OPENGL_RENDERER))
115    
116     GType pango_opengl_renderer_get_type (void);
117    
118     PangoRenderer *_pango_opengl_font_map_get_renderer (PangoOpenGLFontMap *fontmap);
119    
120     G_END_DECLS
121    
122     #endif