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/* Copyright (C) 2018 June 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 <err.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sysexits.h>
#include <unistd.h>
#include "png.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 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;
} font;
static uint8_t *glyphs;
static void fontLoad(const char *path) {
FILE *file = fopen(path, "r");
if (!file) err(EX_NOINPUT, "%s", path);
size_t len = fread(&font, sizeof(font), 1, file);
if (ferror(file)) err(EX_IOERR, "%s", path);
if (len < 1) errx(EX_DATAERR, "%s: truncated header", path);
if (font.magic != 0x864AB572 || font.size != sizeof(font)) {
errx(EX_DATAERR, "%s: invalid header", path);
}
glyphs = calloc(font.glyph.len, font.glyph.size);
if (!glyphs) err(EX_OSERR, "calloc");
len = fread(glyphs, font.glyph.size, font.glyph.len, file);
if (ferror(file)) err(EX_IOERR, "%s", path);
if (len < font.glyph.len) errx(EX_DATAERR, "%s: truncated glyphs", path);
fclose(file);
}
static struct Tile (*tiles)[TileRows][TileCols];
static void tilesMap(const char *path) {
int fd = open(path, O_RDONLY);
if (fd < 0) err(EX_NOINPUT, "%s", path);
struct stat stat;
int error = fstat(fd, &stat);
if (error) err(EX_IOERR, "%s", path);
if ((size_t)stat.st_size < TilesSize) {
errx(EX_DATAERR, "%s: truncated tiles", path);
}
tiles = mmap(NULL, TilesSize, PROT_READ, MAP_SHARED, fd, 0);
if (tiles == MAP_FAILED) err(EX_OSERR, "mmap");
close(fd);
error = madvise(tiles, TilesSize, MADV_RANDOM);
if (error) err(EX_OSERR, "madvise");
}
static void render(uint32_t tileX, uint32_t tileY) {
uint32_t width = CellCols * font.glyph.width;
uint32_t height = CellRows * font.glyph.height;
pngHead(stdout, width, height, 8, PNGIndexed);
pngPalette(stdout, (uint8_t *)Palette, sizeof(Palette));
uint8_t data[height][1 + width];
memset(data, PNGNone, sizeof(data));
uint32_t widthBytes = (font.glyph.width + 7) / 8;
uint8_t (*bits)[font.glyph.len][font.glyph.height][widthBytes];
bits = (void *)glyphs;
struct Tile *tile = &(*tiles)[tileY][tileX];
for (uint32_t cellY = 0; cellY < CellRows; ++cellY) {
for (uint32_t cellX = 0; cellX < CellCols; ++cellX) {
uint8_t cell = tile->cells[cellY][cellX];
uint8_t fg = tile->colors[cellY][cellX] & 0x0F;
uint8_t bg = tile->colors[cellY][cellX] >> 4;
uint32_t glyphX = font.glyph.width * cellX;
uint32_t glyphY = font.glyph.height * cellY;
for (uint32_t y = 0; y < font.glyph.height; ++y) {
for (uint32_t x = 0; x < font.glyph.width; ++x) {
uint8_t bit = (*bits)[cell][y][x / 8] >> (7 - x % 8) & 1;
data[glyphY + y][1 + glyphX + x] = (bit ? fg : bg);
}
}
}
}
pngData(stdout, (uint8_t *)data, sizeof(data));
pngTail(stdout);
}
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;
}
}
fontLoad(fontPath);
tilesMap(dataPath);
render(tileX, tileY);
return EX_OK;
}
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