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
|
/* Copyright (c) 2018, June McEnroe <programble@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// Linux framebuffer clock.
#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sysexits.h>
#include <time.h>
#include <unistd.h>
#include <zlib.h>
static const char *FONT = "/usr/share/kbd/consolefonts/Lat2-Terminus16.psfu.gz";
static const uint32_t PSF2_MAGIC = 0x864AB572;
struct {
uint32_t magic;
uint32_t version;
uint32_t headerSize;
uint32_t flags;
uint32_t glyphCount;
uint32_t glyphSize;
uint32_t glyphHeight;
uint32_t glyphWidth;
};
static const uint32_t BG = 0x1D2021;
static const uint32_t FG = 0xA99A84;
int main() {
size_t count;
gzFile font = gzopen(FONT, "r");
if (!font) err(EX_NOINPUT, "%s", FONT);
struct Psf2Header header;
count = gzfread(&header, sizeof(header), 1, font);
if (!count) errx(EX_IOERR, "%s: %s", FONT, gzerror(font, NULL));
assert(header.magic == PSF2_MAGIC);
assert(header.headerSize == sizeof(struct Psf2Header));
uint8_t glyphs[header.glyphCount][header.glyphSize];
count = gzfread(glyphs, header.glyphSize, header.glyphCount, font);
if (!count) errx(EX_IOERR, "%s: %s", FONT, gzerror(font, NULL));
assert(Z_OK == gzclose(font));
const char *path = getenv("FRAMEBUFFER");
if (!path) path = "/dev/fb0";
int fb = open(path, O_RDWR);
if (fb < 0) err(EX_OSFILE, "%s", path);
struct fb_var_screeninfo info;
int error = ioctl(fb, FBIOGET_VSCREENINFO, &info);
if (error) err(EX_IOERR, "%s", path);
size_t len = 4 * info.xres * info.yres;
uint32_t *buf = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fb, 0);
if (buf == MAP_FAILED) err(EX_IOERR, "%s", path);
for (;;) {
time_t t = time(NULL);
if (t < 0) err(EX_OSERR, "time");
const struct tm *local = localtime(&t);
if (!local) err(EX_OSERR, "localtime");
char str[64];
size_t len = strftime(str, sizeof(str), "%H:%M", local);
for (int i = 0; i < (60 - local->tm_sec); ++i) {
uint32_t left = info.xres - header.glyphWidth * len;
uint32_t bottom = header.glyphHeight;
for (uint32_t y = 0; y < bottom; ++y) {
buf[y * info.xres + left - 1] = FG;
}
for (uint32_t x = left - 1; x < info.xres; ++x) {
buf[bottom * info.xres + x] = FG;
}
for (char *s = str; *s; ++s) {
uint8_t *glyph = glyphs[(uint8_t)*s];
for (uint32_t y = 0; y < header.glyphHeight; ++y) {
for (uint32_t x = 0; x < header.glyphWidth; ++x) {
uint8_t b = glyph[y] >> (header.glyphWidth - x) & 1;
buf[y * info.xres + left + x] = b ? FG : BG;
}
}
left += header.glyphWidth;
}
sleep(1);
}
}
}
|