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
|
#include <fontconfig/fontconfig.h>
#include "font.h"
#include "array.h"
char* get_font(const char* font_name) {
FcPattern* pattern = FcNameParse((const FcChar8*)font_name);
if (!pattern) {
fprintf(stderr, "Failed to create font pattern\n");
return NULL;
}
FcConfigSubstitute(0, pattern, FcMatchPattern);
FcDefaultSubstitute(pattern);
FcResult result = 0;
FcFontSet* font_patterns = FcFontSort(0, pattern, FcTrue, 0, &result);
if (!font_patterns || !font_patterns->nfont) {
fprintf(stderr, "No fonts installed on system\n");
return NULL;
}
FcFontSet* fs = FcFontSetCreate();
FcPattern* font_pattern = FcFontRenderPrepare(0, pattern, font_patterns->fonts[0]);
if (!font_pattern) {
fprintf(stderr, "Could not prepare matched font for loading\n");
return NULL;
}
FcFontSetAdd(fs, font_pattern);
FcFontSetSortDestroy(font_patterns);
FcPatternDestroy(pattern);
if (!fs || !fs->nfont) {
fprintf(stderr, "Could not prepare font set\n");
}
FcObjectSet* os = FcObjectSetBuild(FC_FILE, (char*)0);
FcValue v = { 0 };
FcPattern* fontp = FcPatternFilter(fs->fonts[0], os);
FcPatternGet(fontp, FC_FILE, 0, &v);
char* font = strdup((char*)v.u.f);
FcPatternDestroy(fontp);
FcFontSetDestroy(fs);
FcObjectSetDestroy(os);
return font;
}
bool freetype_init(client_state* state, const char* file) {
if (FT_Init_FreeType(&state->ft_library)) {
fprintf(stderr, "Failed to intalize FreeType Library\n");
return false;
}
if (FT_New_Face(state->ft_library, file, 0, &state->ft_face)) {
fprintf(stderr, "Failed to create font\n");
return false;
}
if (FT_Set_Char_Size(state->ft_face, 0, 16 << 6, 0, 0)) {
fprintf(stderr, "Failed to set font size\n");
return false;
}
state->load_flags = FT_LOAD_RENDER | FT_LOAD_TARGET_(FT_RENDER_MODE_SDF);
return true;
}
void atlas_init(client_state* state) {
for (int i = 32; i < 128; i++) {
if (FT_Load_Char(state->ft_face, i, state->load_flags)) {
fprintf(stderr, "Failed to render character %c\n", (char)i);
}
state->atlas.width += state->ft_face->glyph->bitmap.width;
state->atlas.height = MAX(state->atlas.height, state->ft_face->glyph->bitmap.rows);
metric_t* metric = &state->atlas.metrics[i];
metric->advance_x = (float)state->ft_face->glyph->advance.x / 64;
metric->advance_y = (float)state->ft_face->glyph->advance.y / 64;
metric->bitmap_width = state->ft_face->glyph->bitmap.width;
metric->bitmap_height = state->ft_face->glyph->bitmap.rows;
metric->bearing_x = state->ft_face->glyph->bitmap_left;
metric->bearing_y = state->ft_face->glyph->bitmap_top;
}
}
void atlas_create_texture(client_state* state) {
glActiveTexture(GL_TEXTURE0);
glGenTextures(1, &state->atlas.texture);
glBindTexture(GL_TEXTURE_2D, state->atlas.texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexImage2D(
GL_TEXTURE_2D,
0,
GL_RED,
(GLsizei) state->atlas.width,
(GLsizei) state->atlas.height,
0,
GL_RED,
GL_UNSIGNED_BYTE,
NULL);
uint32_t x = 0;
for (int i = 32; i < 128; i++) {
if (FT_Load_Char(state->ft_face, i, state->load_flags)) {
fprintf(stderr, "Failed to render character %c\n", (char)i);
}
metric_t* metric = &state->atlas.metrics[i];
metric->texture_x_start = (float)x / state->atlas.width;
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexSubImage2D(
GL_TEXTURE_2D,
0,
x,
0,
state->ft_face->glyph->bitmap.width,
state->ft_face->glyph->bitmap.rows,
GL_RED,
GL_UNSIGNED_BYTE,
state->ft_face->glyph->bitmap.buffer);
x += state->ft_face->glyph->bitmap.width;
metric->texture_x_end = (float)x / state->atlas.width;
}
}
int atlas_get_strwidth(client_state* state, const char* str) {
float width = 0;
for (int i = 0; i < strlen(str); i++) {
width += ceil(state->atlas.metrics[(int)str[i]].advance_x);
}
return (int)ceil(width);
}
void atlas_calc_item_widths(client_state* state) {
array_for_all(item_t, item, state->items) {
item->pixel_len = atlas_get_strwidth(state, item->text);
}
}
|
