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/* Copyright (C) 2018 Curtis McEnroe <june@causal.agency>
*
* 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 <arpa/inet.h>
#include <err.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sysexits.h>
#include <unistd.h>
#include <zlib.h>
#include "torus.h"
static const uint8_t Palette[16][3] = {
{ 0x00, 0x00, 0x00 },
{ 0xAA, 0x00, 0x00 },
{ 0x00, 0xAA, 0x00 },
{ 0xAA, 0x55, 0x00 },
{ 0x00, 0x00, 0xAA },
{ 0xAA, 0x00, 0xAA },
{ 0x00, 0xAA, 0xAA },
{ 0xAA, 0xAA, 0xAA },
{ 0x55, 0x55, 0x55 },
{ 0xFF, 0x55, 0x55 },
{ 0x55, 0xFF, 0x55 },
{ 0xFF, 0xFF, 0x55 },
{ 0x55, 0x55, 0xFF },
{ 0xFF, 0x55, 0xFF },
{ 0x55, 0xFF, 0xFF },
{ 0xFF, 0xFF, 0xFF },
};
static uint32_t crc;
static void pngWrite(const void *ptr, size_t size) {
fwrite(ptr, size, 1, stdout);
if (ferror(stdout)) err(EX_IOERR, "(stdout)");
crc = crc32(crc, ptr, size);
}
static void pngInt(uint32_t host) {
uint32_t net = htonl(host);
pngWrite(&net, 4);
}
static void pngChunk(char type[static 4], uint32_t size) {
pngInt(size);
crc = crc32(0, Z_NULL, 0);
pngWrite(type, 4);
}
int main(int argc, char *argv[]) {
const char *fontPath = "default8x16.psfu";
const char *dataPath = "torus.dat";
uint32_t tileX = TileInitX;
uint32_t tileY = TileInitY;
int opt;
while (0 < (opt = getopt(argc, argv, "d:f:x:y:"))) {
switch (opt) {
break; case 'd': dataPath = optarg;
break; case 'f': fontPath = optarg;
break; case 'x': tileX = strtoul(optarg, NULL, 0) % TileCols;
break; case 'y': tileY = strtoul(optarg, NULL, 0) % TileRows;
break; default: return EX_USAGE;
}
}
FILE *file = fopen(fontPath, "r");
if (!file) err(EX_NOINPUT, "%s", fontPath);
struct {
uint32_t magic;
uint32_t version;
uint32_t size;
uint32_t flags;
struct {
uint32_t len;
uint32_t size;
uint32_t height;
uint32_t width;
} glyph;
} psf;
size_t len = fread(&psf, sizeof(psf), 1, file);
if (ferror(file)) err(EX_IOERR, "%s", fontPath);
if (len < 1) errx(EX_DATAERR, "%s: truncated header", fontPath);
uint8_t glyphs[psf.glyph.len][psf.glyph.height][(psf.glyph.width + 7) / 8];
len = fread(glyphs, psf.glyph.size, psf.glyph.len, file);
if (ferror(file)) err(EX_IOERR, "%s", fontPath);
if (len < 1) errx(EX_DATAERR, "%s: truncated glyphs", fontPath);
fclose(file);
int fd = open(dataPath, O_RDONLY);
if (fd < 0) err(EX_NOINPUT, "%s", dataPath);
struct Tile *tile = mmap(
NULL, sizeof(struct Tile),
PROT_READ, MAP_SHARED,
fd, sizeof(struct Tile) * (TileRows * tileY + tileX)
);
if (tile == MAP_FAILED) err(EX_IOERR, "mmap");
close(fd);
pngWrite("\x89PNG\r\n\x1A\n", 8);
uint32_t width = CellCols * psf.glyph.width;
uint32_t height = CellRows * psf.glyph.height;
pngChunk("IHDR", 13);
pngInt(width);
pngInt(height);
pngWrite("\x08\x03\x00\x00\x00", 5);
pngInt(crc);
pngChunk("PLTE", sizeof(Palette));
pngWrite(Palette, sizeof(Palette));
pngInt(crc);
uint8_t data[height][1 + width];
memset(data, 0, sizeof(data));
for (uint32_t y = 0; y < CellRows; ++y) {
for (uint32_t x = 0; x < CellCols; ++x) {
uint8_t cell = tile->cells[y][x];
uint8_t fg = tile->colors[y][x] & 0x0F;
uint8_t bg = tile->colors[y][x] >> 4;
uint32_t row = psf.glyph.height * y;
uint32_t col = psf.glyph.width * x;
for (uint8_t gy = 0; gy < psf.glyph.height; ++gy) {
for (uint8_t gx = 0; gx < psf.glyph.width; ++gx) {
uint8_t bit = glyphs[cell][gy][gx / 8] >> (7 - gx % 8) & 1;
data[row + gy][1 + col + gx] = (bit ? fg : bg);
}
}
}
}
uLong size = compressBound(sizeof(data));
uint8_t deflate[size];
int error = compress(deflate, &size, (Byte *)data, sizeof(data));
if (error != Z_OK) errx(EX_SOFTWARE, "compress: %d", error);
pngChunk("IDAT", size);
pngWrite(deflate, size);
pngInt(crc);
pngChunk("IEND", 0);
pngInt(crc);
return EX_OK;
}
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