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/* 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/>.
*/
#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 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 = 0x161510;
static const uint32_t FG = 0x7A7155;
int main() {
size_t len;
const char *fontPath = getenv("FONT");
if (!fontPath) {
fontPath = "/usr/share/kbd/consolefonts/Lat2-Terminus16.psfu.gz";
}
gzFile font = gzopen(fontPath, "r");
if (!font) err(EX_NOINPUT, "%s", fontPath);
struct Psf2Header header;
len = gzfread(&header, sizeof(header), 1, font);
if (!len && gzeof(font)) errx(EX_DATAERR, "%s: missing header", fontPath);
if (!len) errx(EX_IOERR, "%s", gzerror(font, NULL));
if (header.magic != PSF2_MAGIC) {
errx(
EX_DATAERR, "%s: invalid header magic %08X",
fontPath, header.magic
);
}
if (header.headerSize != sizeof(struct Psf2Header)) {
errx(
EX_DATAERR, "%s: weird header size %d",
fontPath, header.headerSize
);
}
uint8_t glyphs[128][header.glyphSize];
len = gzfread(glyphs, header.glyphSize, 128, font);
if (!len && gzeof(font)) errx(EX_DATAERR, "%s: missing glyphs", fontPath);
if (!len) errx(EX_IOERR, "%s", gzerror(font, NULL));
gzclose(font);
const char *fbPath = getenv("FRAMEBUFFER");
if (!fbPath) fbPath = "/dev/fb0";
int fb = open(fbPath, O_RDWR);
if (fb < 0) err(EX_OSFILE, "%s", fbPath);
struct fb_var_screeninfo info;
int error = ioctl(fb, FBIOGET_VSCREENINFO, &info);
if (error) err(EX_IOERR, "%s", fbPath);
size_t size = 4 * info.xres * info.yres;
uint32_t *buf = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fb, 0);
if (buf == MAP_FAILED) err(EX_IOERR, "%s", fbPath);
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];
len = strftime(str, sizeof(str), "%H:%M", local);
assert(len);
for (int i = 0; i < (60 - local->tm_sec); ++i, sleep(1)) {
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 (const char *s = str; *s; ++s) {
const uint8_t *glyph = glyphs[(unsigned)*s];
uint32_t stride = header.glyphSize / header.glyphHeight;
for (uint32_t y = 0; y < header.glyphHeight; ++y) {
for (uint32_t x = 0; x < header.glyphWidth; ++x) {
uint8_t bits = glyph[y * stride + x / 8];
uint8_t bit = bits >> (7 - x % 8) & 1;
buf[y * info.xres + left + x] = bit ? FG : BG;
}
}
left += header.glyphWidth;
}
}
}
}
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