git.mutantstargoat.com Git - eradicate/blob - tools/rlesprite/src/main.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <errno.h>
   5 #include <stdint.h>
   6 #include <assert.h>
   7 #include <alloca.h>
   8 #include "image.h"
   9
  10 #define MAGIC   "RLESPRIT"
  11
  12 struct file_header {
  13         char magic[8];
  14         uint16_t width, height, bpp;
  15         uint16_t count;
  16 } __attribute__((packed));
  17
  18 enum {
  19         CSOP_END,
  20         CSOP_ENDL,
  21         CSOP_SKIP,
  22         CSOP_FILL,
  23         CSOP_COPY
  24 };
  25
  26 struct csop {
  27         unsigned char op;
  28         unsigned char padding;
  29         uint16_t len;
  30 } __attribute__((packed));
  31
  32
  33 struct rect {
  34         int x, y, w, h;
  35 };
  36
  37 int rlesprite(struct image *img, int x, int y, int xsz, int ysz);
  38 int proc_sheet(const char *fname);
  39 void print_usage(const char *argv0);
  40
  41 int tile_xsz, tile_ysz;
  42 struct rect rect;
  43 int cmap_offs;
  44 int ckey;
  45 int conv565;
  46 int padding;
  47 FILE *outfp;
  48
  49 int main(int argc, char **argv)
  50 {
  51         int i;
  52         char *endp;
  53         const char *name = 0;
  54
  55         for(i=1; i<argc; i++) {
  56                 if(argv[i][0] == '-') {
  57                         if(strcmp(argv[i], "-s") == 0 || strcmp(argv[i], "-size") == 0) {
  58                                 if(sscanf(argv[++i], "%dx%d", &tile_xsz, &tile_ysz) != 2 ||
  59                                                 tile_xsz <= 0 || tile_ysz <= 0) {
  60                                         fprintf(stderr, "%s must be followed by WIDTHxHEIGHT\n", argv[i - 1]);
  61                                         return 1;
  62                                 }
  63
  64                         } else if(strcmp(argv[i], "-r") == 0 || strcmp(argv[i], "-rect") == 0) {
  65                                 rect.x = rect.y = 0;
  66                                 if(sscanf(argv[++i], "%dx%d+%d+%d", &rect.w, &rect.h, &rect.x, &rect.y) < 2 || rect.w <= 0 || rect.h <= 0) {
  67                                         fprintf(stderr, "%s must be followed by WIDTHxHEIGHT+X+Y\n", argv[i - 1]);
  68                                         return 1;
  69                                 }
  70
  71                         } else if(strcmp(argv[i], "-p") == 0 || strcmp(argv[i], "-pad") == 0) {
  72                                 padding = strtol(argv[++i], &endp, 10);
  73                                 if(endp == argv[i] || padding < 0) {
  74                                         fprintf(stderr, "%s must be followed by a positive number\n", argv[i - 1]);
  75                                         return 1;
  76                                 }
  77
  78                         } else if(strcmp(argv[i], "-coffset") == 0) {
  79                                 cmap_offs = strtol(argv[++i], &endp, 10);
  80                                 if(endp == argv[i] || cmap_offs < 0 || cmap_offs >= 256) {
  81                                         fprintf(stderr, "-coffset must be followed by a valid colormap offset\n");
  82                                         return 1;
  83                                 }
  84
  85                         } else if(strcmp(argv[i], "-o") == 0) {
  86                                 if(!argv[++i]) {
  87                                         fprintf(stderr, "%s must be followed by an output filename\n", argv[i - 1]);
  88                                         return 1;
  89                                 }
  90                                 if(name && strcmp(name, argv[i]) != 0) {
  91                                         if(outfp) {
  92                                                 fclose(outfp);
  93                                                 outfp = 0;
  94                                         }
  95                                 }
  96                                 name = argv[i];
  97
  98                         } else if(strcmp(argv[i], "-k") == 0 || strcmp(argv[i], "-key") == 0) {
  99                                 ckey = strtol(argv[++i], &endp, 10);
 100                                 if(endp == argv[i] || ckey < 0) {
 101                                         fprintf(stderr, "%s must be followed by a valid color key\n", argv[i - 1]);
 102                                         return 1;
 103                                 }
 104
 105                         } else if(strcmp(argv[i], "-conv565") == 0) {
 106                                 conv565 = 1;
 107
 108                         } else if(strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "-help") == 0) {
 109                                 print_usage(argv[0]);
 110                                 return 0;
 111
 112                         } else {
 113                                 fprintf(stderr, "invalid option: %s\n", argv[i]);
 114                                 print_usage(argv[0]);
 115                                 return 1;
 116                         }
 117
 118                 } else {
 119                         if(!outfp) {
 120                                 if(name) {
 121                                         if(!(outfp = fopen(name, "wb"))) {
 122                                                 fprintf(stderr, "failed to open output file: %s: %s\n", name, strerror(errno));
 123                                                 return 1;
 124                                         }
 125                                 } else {
 126                                         outfp = stdout;
 127                                 }
 128                         }
 129
 130                         if(proc_sheet(argv[i]) == -1) {
 131                                 return 1;
 132                         }
 133                 }
 134         }
 135
 136         return 0;
 137 }
 138
 139 int proc_sheet(const char *fname)
 140 {
 141         int i, j, x, y, num_xtiles, num_ytiles, xsz, ysz;
 142         struct image img;
 143         struct file_header hdr;
 144
 145         if(load_image(&img, fname) == -1) {
 146                 fprintf(stderr, "failed to load image: %s\n", fname);
 147                 return -1;
 148         }
 149         if(conv565) {
 150                 struct image tmp;
 151                 if(conv_image_rgb565(&tmp, &img) == -1) {
 152                         fprintf(stderr, "failed to convert image to 16bpp 565: %s\n", fname);
 153                         free(img.pixels);
 154                         return -1;
 155                 }
 156                 free(img.pixels);
 157                 img = tmp;
 158         }
 159
 160         if(rect.w <= 0) {
 161                 rect.w = img.width;
 162                 rect.h = img.height;
 163         }
 164
 165         if(tile_xsz <= 0) {
 166                 num_xtiles = num_ytiles = 1;
 167                 xsz = rect.w - padding;
 168                 ysz = rect.h - padding;
 169         } else {
 170                 if(padding) {
 171                         num_xtiles = num_ytiles = 0;
 172                         i = 0;
 173                         while(i < rect.w) {
 174                                 num_xtiles++;
 175                                 i += tile_xsz + padding;
 176                         }
 177                         i = 0;
 178                         while(i < rect.h) {
 179                                 num_ytiles++;
 180                                 i += tile_ysz + padding;
 181                         }
 182                 } else {
 183                         num_xtiles = rect.w / tile_xsz;
 184                         num_ytiles = rect.h / tile_ysz;
 185                 }
 186                 xsz = tile_xsz;
 187                 ysz = tile_ysz;
 188         }
 189
 190         memcpy(hdr.magic, MAGIC, sizeof hdr.magic);
 191         hdr.width = xsz;
 192         hdr.height = ysz;
 193         hdr.bpp = img.bpp;
 194         hdr.count = num_xtiles * num_ytiles;
 195         fwrite(&hdr, sizeof hdr, 1, outfp);
 196
 197         y = rect.y;
 198         for(i=0; i<num_ytiles; i++) {
 199                 x = rect.x;
 200                 for(j=0; j<num_xtiles; j++) {
 201                         rlesprite(&img, x, y, xsz, ysz);
 202                         x += xsz + padding;
 203                 }
 204                 y += ysz + padding;
 205         }
 206
 207         free(img.pixels);
 208         return 0;
 209 }
 210
 211 int rlesprite(struct image *img, int x, int y, int xsz, int ysz)
 212 {
 213         int i, j, numops, mode, new_mode, start, skip_acc, pixsz = img->bpp / 8;
 214         unsigned char *pptr = img->pixels + y * img->scansz + x * pixsz;
 215         struct csop *ops, *optr, endop = {0};
 216
 217         ops = optr = alloca((xsz + 1) * ysz * sizeof *ops);
 218
 219         for(i=0; i<ysz; i++) {
 220                 mode = -1;
 221                 start = -1;
 222
 223                 if(i > 0) {
 224                         optr++->op = CSOP_ENDL;
 225                 }
 226
 227                 for(j=0; j<xsz; j++) {
 228                         if(memcmp(pptr, &ckey, pixsz) == 0) {
 229                                 new_mode = CSOP_SKIP;
 230                         } else {
 231                                 new_mode = CSOP_COPY;
 232                         }
 233
 234                         if(new_mode != mode) {
 235                                 if(mode != -1) {
 236                                         assert(start >= 0);
 237                                         optr->op = mode;
 238                                         optr->len = j - start;
 239                                         optr++;
 240                                 }
 241                                 mode = new_mode;
 242                                 start = j;
 243                         }
 244                         pptr += pixsz;
 245                 }
 246                 pptr += img->scansz - xsz * pixsz;
 247
 248                 if(mode != -1) {
 249                         assert(start >= 0);
 250                         optr->op = mode;
 251                         optr->len = xsz - start;
 252                         optr++;
 253                 }
 254         }
 255         numops = optr - ops;
 256
 257         pptr = img->pixels + y * img->scansz + x * img->bpp / 8;
 258         optr = ops;
 259         skip_acc = 0;
 260
 261         for(i=0; i<numops; i++) {
 262                 switch(optr->op) {
 263                 case CSOP_SKIP:
 264                         skip_acc += optr->len;
 265                         pptr += optr->len * pixsz;
 266                         break;
 267
 268                 case CSOP_ENDL:
 269                         /* maybe at some point combine multiple endl into yskips? meh */
 270                         fwrite(optr, sizeof *optr, 1, outfp);
 271                         skip_acc = 0;
 272                         pptr += img->scansz - xsz * pixsz;
 273                         break;
 274
 275                 case CSOP_COPY:
 276                         if(skip_acc) {
 277                                 struct csop skip = {0};
 278                                 skip.op = CSOP_SKIP;
 279                                 skip.len = skip_acc;
 280                                 fwrite(&skip, sizeof skip, 1, outfp);
 281                                 skip_acc = 0;
 282                         }
 283
 284                         fwrite(optr, sizeof *optr, 1, outfp);
 285                         fwrite(pptr, pixsz, optr->len, outfp);
 286
 287                         pptr += optr->len;
 288                         break;
 289
 290                 default:
 291                         fprintf(stderr, "invalid op\n");
 292                 }
 293                 optr++;
 294         }
 295
 296         endop.op = CSOP_END;
 297         fwrite(&endop, sizeof endop, 1, outfp);
 298         return 0;
 299 }
 300
 301 void print_usage(const char *argv0)
 302 {
 303         printf("Usage: %s [options] <spritesheet>\n", argv0);
 304         printf("Options:\n");
 305         printf(" -o <filename>: output filename (default: stdout)\n");
 306         printf(" -s,-size <WxH>: tile size (default: whole image)\n");
 307         printf(" -r,-rect <WxH+X+Y>: use rectangle of the input image (default: whole image)\n");
 308         printf(" -p,-pad <N>: how many pixels to skip between tiles in source image (default: 0)\n");
 309         printf(" -coffset <offs>: colormap offset [0, 255] (default: 0)\n");
 310         printf(" -k,-key <color>: color-key for transparency (default: 0)\n");
 311         printf(" -conv565: convert image to 16bpp 565 before processing\n");
 312         printf(" -h: print usage and exit\n");
 313 }