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
198
199
200
201
202
|
/* 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 <sys/stat.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 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 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);
}
static void render(uint32_t tileX, uint32_t tileY) {
uint32_t width = CellCols * font.glyph.width;
uint32_t height = CellRows * font.glyph.height;
pngWrite("\x89PNG\r\n\x1A\n", 8);
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));
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);
}
}
}
}
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);
}
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;
}
|