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
|
#include <stdlib.h>
#include <stdio.h>
#include <pango2/pangocairo.h>
#include "userfont.h"
#define END_GLYPH 0
#define STROKE 126
#define CLOSE 127
/* Simple glyph definition: 1 - 15 means lineto (or moveto for first
* point) for one of the points on this grid:
*
* 1 2 3
* 4 5 6
* 7 8 9
* ----10 11 12----(baseline)
* 13 14 15
*/
typedef struct
{
gunichar ucs4;
int width;
char data[16];
} test_scaled_font_glyph_t;
/* Simple glyph definition: 1 - 15 means lineto (or moveto for first
* point) for one of the points on this grid:
*
* 1 2 3
* 4 5 6
* 7 8 9
* ----10 11 12----(baseline)
* 13 14 15
*/
static const test_scaled_font_glyph_t glyphs [] = {
{ 'a', 3, { 4, 6, 12, 10, 7, 9, STROKE, END_GLYPH } },
{ 'c', 3, { 6, 4, 10, 12, STROKE, END_GLYPH } },
{ 'e', 3, { 12, 10, 4, 6, 9, 7, STROKE, END_GLYPH } },
{ 'f', 3, { 3, 2, 11, STROKE, 4, 6, STROKE, END_GLYPH } },
{ 'g', 3, { 12, 10, 4, 6, 15, 13, STROKE, END_GLYPH } },
{ 'h', 3, { 1, 10, STROKE, 7, 5, 6, 12, STROKE, END_GLYPH } },
{ 'i', 1, { 1, 1, STROKE, 4, 10, STROKE, END_GLYPH } },
{ 'l', 1, { 1, 10, STROKE, END_GLYPH } },
{ 'n', 3, { 10, 4, STROKE, 7, 5, 6, 12, STROKE, END_GLYPH } },
{ 'o', 3, { 4, 10, 12, 6, CLOSE, END_GLYPH } },
{ 'p', 3, { 4, 10, 12, 6, CLOSE, 4, 13, STROKE, END_GLYPH } },
{ 'r', 3, { 4, 10, STROKE, 7, 5, 6, STROKE, END_GLYPH } },
{ 's', 3, { 6, 4, 7, 9, 12, 10, STROKE, END_GLYPH } },
{ 't', 3, { 2, 11, 12, STROKE, 4, 6, STROKE, END_GLYPH } },
{ 'u', 3, { 4, 10, 12, 6, STROKE, END_GLYPH } },
{ 'y', 3, { 4, 10, 12, 6, STROKE, 12, 15, 13, STROKE, END_GLYPH } },
{ 'z', 3, { 4, 6, 10, 12, STROKE, END_GLYPH } },
{ ' ', 1, { END_GLYPH } },
{ '-', 2, { 7, 8, STROKE, END_GLYPH } },
{ '.', 1, { 10, 10, STROKE, END_GLYPH } },
{ 0xe000, 3, { 3, 2, 11, STROKE, 4, 6, STROKE, 3, 3, STROKE, 6, 12, STROKE, END_GLYPH } }, /* fi */
{ -1, 0, { END_GLYPH } },
};
static gboolean
glyph_cb (Pango2UserFace *face,
hb_codepoint_t unicode,
hb_codepoint_t *glyph,
gpointer user_data)
{
test_scaled_font_glyph_t *glyphs = user_data;
for (int i = 0; glyphs[i].ucs4 != (gunichar) -1; i++)
{
if (glyphs[i].ucs4 == unicode)
{
*glyph = i;
return TRUE;
}
}
return FALSE;
}
static gboolean
glyph_info_cb (Pango2UserFace *face,
int size,
hb_codepoint_t glyph,
hb_glyph_extents_t *extents,
hb_position_t *h_advance,
hb_position_t *v_advance,
gboolean *is_color,
gpointer user_data)
{
test_scaled_font_glyph_t *glyphs = user_data;
extents->x_bearing = 0;
extents->y_bearing = 0.75 * size;
extents->width = glyphs[glyph].width / 4.0 * size;
extents->height = - size;
*h_advance = *v_advance = glyphs[glyph].width / 4.0 * size;
*is_color = FALSE;
return TRUE;
}
static gboolean
font_info_cb (Pango2UserFace *face,
int size,
hb_font_extents_t *extents,
gpointer user_data)
{
extents->ascender = 0.75 * size;
extents->descender = - 0.25 * size;
extents->line_gap = 0;
return TRUE;
}
static gboolean
render_cb (Pango2UserFace *face,
int size,
hb_codepoint_t glyph,
gpointer user_data,
const char *backend_id,
gpointer backend_data)
{
test_scaled_font_glyph_t *glyphs = user_data;
cairo_t *cr = backend_data;
const char *data;
div_t d;
double x, y;
if (strcmp (backend_id, "cairo") != 0)
return FALSE;
cairo_set_line_width (cr, 0.1);
cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
data = glyphs[glyph].data;
for (int i = 0; data[i] != END_GLYPH; i++)
{
switch (data[i])
{
case STROKE:
cairo_new_sub_path (cr);
break;
case CLOSE:
cairo_close_path (cr);
break;
default:
d = div (data[i] - 1, 3);
x = d.rem / 4.0 + 0.125;
y = d.quot / 5.0 + 0.4 - 1.0;
cairo_line_to (cr, x, y);
}
}
cairo_stroke (cr);
return TRUE;
}
void
add_userfont (Pango2FontMap *fontmap)
{
Pango2FontDescription *desc;
Pango2UserFace *face;
desc = pango2_font_description_new ();
pango2_font_description_set_family (desc, "Userfont");
face = pango2_user_face_new (font_info_cb,
glyph_cb,
glyph_info_cb,
NULL,
render_cb,
(gpointer) glyphs, NULL,
"Black", desc);
pango2_font_map_add_face (fontmap, PANGO2_FONT_FACE (face));
pango2_font_description_free (desc);
}
|
