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
|
/* SPDX-License-Identifier: MIT */
/*
* konfont.h
*
* Copyright (c) 2026 KonAki
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef KONFONT_H
#define KONFONT_H
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdlib.h>
#include "konsofren.h"
#define KON_FONT_FIRST_CHAR 32
#define KON_FONT_NUM_CHARS 95
typedef struct kon_font kon_font_t;
/*** font declarations ***/
kon_font_t *kon_loadFont(const uint8_t *ttf_data, size_t size, float pixelHeight);
void kon_freeFont(kon_font_t *font);
kon_image *kon_fontGetAtlas(kon_font_t *font);
/*** text draw declarations ***/
void kon_drawText(kon_framebuffer_t *fb, kon_font_t *font, int x, int y, const char *text, uint32_t color);
void kon_measureText(kon_font_t *font, const char *text, int *outWidth, int *outHeight);
/*** implementatoin ***/
#ifdef KONFONT_IMPLEMENTATION
#include "stb_truetype.h"
struct kon_font {
stbtt_bakedchar chardata[KON_FONT_NUM_CHARS];
uint8_t *atlasPixels;
int atlasSize;
float pixelHeight;
};
/*** private helpers ***/
static bool kon_fontBakeAtlas(kon_font_t *font, const uint8_t *ttf_data, float pixelHeight) {
int sizes[] = {256, 512, 1024, 2048};
for (int i = 0; i < 4; i++) {
int atlasSize = sizes[i];
uint8_t *bitmap = malloc((size_t)atlasSize * (size_t)atlasSize);
if (!bitmap) return false;
int result = stbtt_BakeFontBitmap(ttf_data, 0, pixelHeight, bitmap, atlasSize, atlasSize, KON_FONT_FIRST_CHAR, KON_FONT_NUM_CHARS, font->chardata);
if (result > 0) {
font->atlasPixels = bitmap;
font->atlasSize = atlasSize;
return true;
}
free(bitmap);
}
return false;
}
/*** font implementation ***/
kon_font_t *kon_loadFont(const uint8_t *ttf_data, size_t size, float pixelHeight) {
(void)size;
if (!ttf_data || pixelHeight <= 0.0f) return NULL;
kon_font_t *font = malloc(sizeof(kon_font_t));
if (!font) return NULL;
font->atlasPixels = NULL;
font->pixelHeight = pixelHeight;
if (!kon_fontBakeAtlas(font, ttf_data, pixelHeight)) {
free(font);
return NULL;
}
return font;
}
void kon_freeFont(kon_font_t *font) {
if (!font) return;
free(font->atlasPixels);
free(font);
}
kon_image *kon_fontGetAtlas(kon_font_t *font) {
if (!font) return NULL;
int n = font->atlasSize * font->atlasSize;
uint8_t *rgba = malloc((size_t)n * 4);
if (!rgba) return NULL;
for (int i = 0; i < n; i++) {
uint8_t a = font->atlasPixels[i];
rgba[i * 4 + 0] = 255;
rgba[i * 4 + 1] = 255;
rgba[i * 4 + 2] = 255;
rgba[i * 4 + 3] = a;
}
kon_image *img = kon_loadImage(rgba, font->atlasSize, font->atlasSize, konFormatRGBA8);
free(rgba);
return img;
}
/*** text draw implementation ***/
void kon_drawText(kon_framebuffer_t *fb, kon_font_t *font, int x, int y, const char *text, uint32_t color) {
if (!fb || !font || !text) return;
uint32_t baseColor = color & 0x00FFFFFF;
float cursorX = (float)x;
float cursorY = (float)y;
for (const char *p = text; *p; p++) {
unsigned char c = (unsigned char)*p;
if (c < KON_FONT_FIRST_CHAR || c >= KON_FONT_FIRST_CHAR + KON_FONT_NUM_CHARS) continue;
stbtt_aligned_quad q;
stbtt_GetBakedQuad(font->chardata, font->atlasSize, font->atlasSize, c - KON_FONT_FIRST_CHAR, &cursorX, &cursorY, &q, 0);
int src_x0 = (int)(q.s0 * font->atlasSize);
int src_y0 = (int)(q.t0 * font->atlasSize);
int glyphW = (int)(q.x1 - q.x0);
int glyphH = (int)(q.y1 - q.y0);
for (int gy = 0; gy < glyphH; gy++) {
for (int gx = 0; gx < glyphW; gx++) {
uint8_t alpha = font->atlasPixels[(src_y0 + gy) * font->atlasSize + (src_x0 + gx)];
if (alpha == 0) continue;
kon_putPixel(fb, (int)q.x0 + gx, (int)q.y0 + gy, ((uint32_t)alpha << 24) | baseColor);
}
}
}
}
void kon_measureText(kon_font_t *font, const char *text, int *outWidth, int *outHeight) {
if (!font || !text) return;
float cursorX = 0.0f;
float cursorY = 0.0f;
float maxX = 0.0f;
for (const char *p = text; *p; p++) {
unsigned char c = (unsigned char)*p;
if (c < KON_FONT_FIRST_CHAR || c >= KON_FONT_FIRST_CHAR + KON_FONT_NUM_CHARS) continue;
stbtt_aligned_quad q;
stbtt_GetBakedQuad(font->chardata, font->atlasSize, font->atlasSize, c - KON_FONT_FIRST_CHAR, &cursorX, &cursorY, &q, 0);
if (cursorX > maxX) maxX = cursorX;
}
if (outWidth) *outWidth = (int)maxX;
if (outHeight) *outHeight = (int)font->pixelHeight;
}
#endif /* KONFONT_IMPLEMENTATION */
#endif /* KONFONT_H */
|
