16 static int verbose = 0;
17 static char *outname = "out";
18 static int usepalette = 1;
20 static const char *progname;
21 #define errmsg(fmt, ...) (\
22 fprintf(stderr, "%s: " fmt, progname, __VA_ARGS__)\
31 int parserange(struct lbx_imginfo *info, char *str, unsigned char *bits)
33 unsigned long start, end;
37 start = strtoul(str, &endptr, 0);
38 if (start >= info->nframes) {
39 errmsg("frame %lu out of range.\n", start);
44 errmsg("invalid frame range: %s.\n", str);
53 end = strtoul(endptr+1, &endptr, 0);
54 if (end >= info->nframes) {
55 errmsg("frame %lu out of range.\n", end);
60 end = info->nframes - 1;
63 errmsg("invalid frame range: %s.\n", str);
68 errmsg("invalid frame range: %s.\n", str);
72 for (i = start; i <= end; i++) {
73 bits[i / CHAR_BIT] |= 1 << (i % CHAR_BIT);
79 static int ismasked(unsigned char **mask, unsigned width, unsigned height)
82 for (y = 0; y < height; y++) {
83 for (x = 0; x < width; x++) {
84 if (mask[y][x] == 0) return 1;
91 int outpng(unsigned int frameno,
92 unsigned char **framedata, unsigned char **mask,
93 unsigned int width, unsigned int height,
94 struct lbx_colour palette[static 256])
96 char name[strlen(outname) + sizeof ".65535.png"];
104 assert(frameno < 65536);
105 snprintf(name, sizeof name, "%s.%03d.png", outname, frameno);
107 row = malloc(4 * width);
109 errmsg("failed to allocate row buffer: %s\n", strerror(errno));
113 of = fopen(name, "wb");
115 errmsg("failed to open %s: %s.\n", name, strerror(errno));
120 png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
122 errmsg("failed to init libpng.\n", 0);
126 info = png_create_info_struct(png);
128 errmsg("failed to init libpng.\n", 0);
129 png_destroy_write_struct(&png, NULL);
133 if (setjmp(png_jmpbuf(png))) {
135 png_destroy_write_struct(&png, &info);
139 png_init_io(png, of);
141 if (!ismasked(mask, width, height)) {
143 * This case is easy; we can just feed the palette and pixel
144 * data to libpng and let it do its magic.
147 png_set_IHDR(png, info, width, height, 8,
148 PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
149 PNG_COMPRESSION_TYPE_DEFAULT,
150 PNG_FILTER_TYPE_DEFAULT);
152 png_set_PLTE(png, info, (png_colorp)palette, 256);
153 png_set_rows(png, info, framedata);
154 png_write_png(png, info, PNG_TRANSFORM_IDENTITY, NULL);
157 * Unfortunately, LBX doesn't translate nicely to PNG here.
158 * LBX has a 256 colour palette _plus_ transparency.
159 * We'll form an RGBA PNG to deal with this.
162 png_set_IHDR(png, info, width, height, 8,
163 PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
164 PNG_COMPRESSION_TYPE_DEFAULT,
165 PNG_FILTER_TYPE_DEFAULT);
167 png_write_info(png, info);
169 for (y = 0; y < height; y++) {
170 for (x = 0; x < width; x++) {
171 row[4*x+0] = palette[framedata[y][x]].red;
172 row[4*x+1] = palette[framedata[y][x]].green;
173 row[4*x+2] = palette[framedata[y][x]].blue;
174 row[4*x+3] = (mask[y][x]) ? -1 : 0;
177 png_write_row(png, row);
180 png_write_end(png, NULL);
183 png_destroy_write_struct(&png, &info);
187 printf("wrote %s\n", name);
198 static int loadoverride(FILE *f, struct lbx_colour palette[static 256])
200 LBX_IMG *overimg = lbximg_fopen(f);
201 struct lbx_imginfo info;
204 errmsg("failed to open override image: %s\n", lbx_strerror());
207 lbximg_getinfo(overimg, &info);
209 if (!info.haspalette) {
210 errmsg("override image has no palette.\n", 0);
211 lbximg_close(overimg);
215 if (lbximg_getpalette(overimg, palette) == -1) {
216 errmsg("error reading override palette: %s\n", lbx_strerror());
217 lbximg_close(overimg);
221 lbximg_close(overimg);
225 static int loadpalette(LBX_IMG *img, struct lbx_imginfo *info,
226 FILE *palf, FILE *override,
227 struct lbx_colour palette[static 256])
231 /* In no-palette mode, use palette indices for colour. */
233 for (i = 0; i < 256; i++) {
234 palette[i] = (struct lbx_colour){i,i,i};
241 if (!palf && !info->haspalette && !override) {
242 errmsg("no palette available.\n", 0);
246 /* Default the palette to a wonderful pink. */
247 for (i = 0; i < 256; i++) {
248 palette[i] = (struct lbx_colour){0xff, 0x00, 0xff};
251 /* Read the external palette, if any. */
252 if (palf && lbximg_loadpalette(palf, palette) == -1) {
253 errmsg("error reading external palette: %s\n", lbx_strerror());
257 /* Read the embedded palette, if any. */
258 if (info->haspalette && lbximg_getpalette(img, palette) == -1) {
259 errmsg("error reading embedded palette: %s\n", lbx_strerror());
263 /* Read the override palette, if any. */
264 if (override && loadoverride(override, palette) == -1) {
271 int decode(LBX_IMG *img, FILE *palf, FILE *override, char **argv)
273 unsigned char *framebits;
274 struct lbx_colour palette[256];
275 struct lbx_imginfo info;
279 lbximg_getinfo(img, &info);
281 framebits = malloc(info.nframes / CHAR_BIT + 1);
286 /* Figure out what images we're extracting. */
288 /* extract all images by default. */
289 memset(framebits, -1, info.nframes / CHAR_BIT + 1);
291 for (i = 0; argv[i]; i++) {
292 parserange(&info, argv[i], framebits);
296 if (loadpalette(img, &info, palf, override, palette) == -1) {
300 /* Extract the images, in order. */
301 for (i = 0; i < info.nframes; i++) {
302 unsigned char **data;
303 unsigned char **mask;
305 if (!(framebits[i / CHAR_BIT] & (1 << (i % CHAR_BIT))))
308 data = lbximg_getframe(img, i);
310 errmsg("error in frame %u: %s\n", i, lbx_strerror());
314 mask = lbximg_getmask(img);
316 if (!outpng(i, data, mask, info.width, info.height, palette)) {
322 errmsg("no frames extracted.\n", 0);
333 int main(int argc, char **argv)
335 int mode = MODE_NONE;
336 FILE *inf = stdin, *palf = NULL, *overf = NULL;
337 const char *name = "stdin";
341 static const char *sopts = "idvf:p:O:";
342 static const struct option lopts[] = {
343 { "info", 0, NULL, 'i' },
344 { "decode", 0, NULL, 'd' },
345 { "verbose", 0, NULL, 'v' },
346 { "file", 1, NULL, 'f' },
347 { "palette", 1, NULL, 'p' },
348 { "override", 1, NULL, 'p' },
350 { "nopalette", 0, &usepalette, 0 },
355 progname = "lbximg"; /* argv[0]; */
356 while ((opt = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
368 if (strcmp(optarg, "-") == 0)
371 name = strrchr(optarg, '/');
372 name = name ? name+1 : optarg;
374 inf = fopen(optarg, "rb");
376 errmsg("failed to open %s: %m\n", optarg);
381 palf = fopen(optarg, "rb");
383 errmsg("failed to open %s: %m\n", optarg);
389 overf = fopen(optarg, "rb");
391 errmsg("failed to open %s: %m\n", optarg);
401 if (mode == MODE_NONE) {
402 errmsg("you must specify a mode.\n", 0);
406 img = lbximg_fopen(inf);
408 errmsg("failed to open image: %s.\n", lbx_strerror());
412 if (verbose || mode == MODE_IDENT) {
413 struct lbx_imginfo info;
414 lbximg_getinfo(img, &info);
416 printf("%s is %ux%u LBX image, %u frame(s)%s%s\n",
417 name, info.width, info.height, info.nframes,
418 info.haspalette ? ", embedded palette" : "",
419 info.looping ? ", loops" : "");
424 if (decode(img, palf, overf, &argv[optind])) {