summaryrefslogtreecommitdiff
path: root/pango/pango-glyph.h
blob: be0f02dca512dc6d781ba03655f8abc05516dce3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
/* Pango
 * pango-glyph.h: Glyph storage
 *
 * Copyright (C) 2000 Red Hat Software
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifndef __PANGO_GLYPH_H__
#define __PANGO_GLYPH_H__

#include <pango/pango-types.h>
#include <pango/pango-item.h>

G_BEGIN_DECLS

typedef struct _PangoGlyphGeometry PangoGlyphGeometry;
typedef struct _PangoGlyphVisAttr PangoGlyphVisAttr;
typedef struct _PangoGlyphInfo PangoGlyphInfo;
typedef struct _PangoGlyphString PangoGlyphString;

/* 1024ths of a device unit */
/**
 * PangoGlyphUnit:
 *
 * The #PangoGlyphUnit type is used to store dimensions within
 * Pango. Dimensions are stored in 1/%PANGO_SCALE of a device unit.
 * (A device unit might be a pixel for screen display, or
 * a point on a printer.) %PANGO_SCALE is currently 1024, and
 * may change in the future (unlikely though), but you should not
 * depend on its exact value. The PANGO_PIXELS() macro can be used
 * to convert from glyph units into device units with correct rounding.
 */
typedef gint32 PangoGlyphUnit;

/* Positioning information about a glyph
 */
/**
 * PangoGlyphGeometry:
 * @width: the logical width to use for the the character.
 * @x_offset: horizontal offset from nominal character position.
 * @y_offset: vertical offset from nominal character position.
 *
 * The #PangoGlyphGeometry structure contains width and positioning
 * information for a single glyph.
 */
struct _PangoGlyphGeometry
{
  PangoGlyphUnit width;
  PangoGlyphUnit x_offset;
  PangoGlyphUnit y_offset;
};

/* Visual attributes of a glyph
 */
/**
 * PangoGlyphVisAttr:
 * @is_cluster_start: set for the first logical glyph in each cluster. (Clusters
 * are stored in visual order, within the cluster, glyphs
 * are always ordered in logical order, since visual
 * order is meaningless; that is, in Arabic text, accent glyphs
 * follow the glyphs for the base character.)
 *
 * The PangoGlyphVisAttr is used to communicate information between
 * the shaping phase and the rendering phase.  More attributes may be
 * added in the future.
 */
struct _PangoGlyphVisAttr
{
  guint is_cluster_start : 1;
};

/* A single glyph
 */
/**
 * PangoGlyphInfo:
 * @glyph: the glyph itself.
 * @geometry: the positional information about the glyph.
 * @attr: the visual attributes of the glyph.
 *
 * The #PangoGlyphInfo structure represents a single glyph together with
 * positioning information and visual attributes.
 * It contains the following fields.
 */
struct _PangoGlyphInfo
{
  PangoGlyph    glyph;
  PangoGlyphGeometry geometry;
  PangoGlyphVisAttr  attr;
};

/* A string of glyphs with positional information and visual attributes -
 * ready for drawing
 */
/**
 * PangoGlyphString:
 * @num_glyphs: number of the glyphs in this glyph string.
 * @glyphs: (array length=num_glyphs): array of glyph information
 *          for the glyph string.
 * @log_clusters: logical cluster info, indexed by the byte index
 *                within the text corresponding to the glyph string.
 *
 * The #PangoGlyphString structure is used to store strings
 * of glyphs with geometry and visual attribute information.
 * The storage for the glyph information is owned
 * by the structure which simplifies memory management.
 */
struct _PangoGlyphString {
  gint num_glyphs;

  PangoGlyphInfo *glyphs;

  /* This is a memory inefficient way of representing the information
   * here - each value gives the byte index within the text
   * corresponding to the glyph string of the start of the cluster to
   * which the glyph belongs.
   */
  gint *log_clusters;

  /*< private >*/
  gint space;
};

/**
 * PANGO_TYPE_GLYPH_STRING:
 *
 * The #GObject type for #PangoGlyphString.
 */
#define PANGO_TYPE_GLYPH_STRING (pango_glyph_string_get_type ())

PangoGlyphString *pango_glyph_string_new      (void);
void              pango_glyph_string_set_size (PangoGlyphString *string,
					       gint              new_len);
GType             pango_glyph_string_get_type (void) G_GNUC_CONST;
PangoGlyphString *pango_glyph_string_copy     (PangoGlyphString *string);
void              pango_glyph_string_free     (PangoGlyphString *string);
void              pango_glyph_string_extents  (PangoGlyphString *glyphs,
					       PangoFont        *font,
					       PangoRectangle   *ink_rect,
					       PangoRectangle   *logical_rect);
int               pango_glyph_string_get_width(PangoGlyphString *glyphs);

void              pango_glyph_string_extents_range  (PangoGlyphString *glyphs,
						     int               start,
						     int               end,
						     PangoFont        *font,
						     PangoRectangle   *ink_rect,
						     PangoRectangle   *logical_rect);

void pango_glyph_string_get_logical_widths (PangoGlyphString *glyphs,
					    const char       *text,
					    int               length,
					    int               embedding_level,
					    int              *logical_widths);

void pango_glyph_string_index_to_x (PangoGlyphString *glyphs,
				    char             *text,
				    int               length,
				    PangoAnalysis    *analysis,
				    int               index_,
				    gboolean          trailing,
				    int              *x_pos);
void pango_glyph_string_x_to_index (PangoGlyphString *glyphs,
				    char             *text,
				    int               length,
				    PangoAnalysis    *analysis,
				    int               x_pos,
				    int              *index_,
				    int              *trailing);

/* Turn a string of characters into a string of glyphs
 */
void pango_shape (const gchar      *text,
		  gint              length,
		  const PangoAnalysis *analysis,
		  PangoGlyphString *glyphs);

void pango_shape_full (const gchar      *item_text,
		       gint              item_length,
		       const gchar      *paragraph_text,
		       gint              paragraph_length,
		       const PangoAnalysis *analysis,
		       PangoGlyphString *glyphs);

GList *pango_reorder_items (GList *logical_items);

G_END_DECLS

#endif /* __PANGO_GLYPH_H__ */