git.mutantstargoat.com Git - gba_blender/blob - tools/pngdump/main.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <errno.h>
   5 #include <assert.h>
   6 #include "image.h"
   7
   8 void print_usage(const char *argv0);
   9
  10 int main(int argc, char **argv)
  11 {
  12         int i, mode = 0;
  13         int text = 0;
  14         int renibble = 0;
  15         char *fname = 0, *outfname = 0;
  16         struct image img;
  17         FILE *out = stdout;
  18
  19         for(i=1; i<argc; i++) {
  20                 if(argv[i][0] == '-') {
  21                         if(argv[i][2] == 0) {
  22                                 switch(argv[i][1]) {
  23                                 case 'p':
  24                                         mode = 0;
  25                                         break;
  26
  27                                 case 'c':
  28                                         mode = 1;
  29                                         break;
  30
  31                                 case 'i':
  32                                         mode = 2;
  33                                         break;
  34
  35                                 case 't':
  36                                         text = 1;
  37                                         break;
  38
  39                                 case 'n':
  40                                         renibble = 1;
  41                                         break;
  42
  43                                 case 'o':
  44                                         if(!argv[++i]) {
  45                                                 fprintf(stderr, "%s must be followed by a filename\n", argv[i - 1]);
  46                                                 return 1;
  47                                         }
  48                                         outfname = argv[i];
  49                                         break;
  50
  51                                 case 'h':
  52                                         print_usage(argv[0]);
  53                                         return 0;
  54
  55                                 default:
  56                                         fprintf(stderr, "invalid option: %s\n", argv[i]);
  57                                         print_usage(argv[0]);
  58                                         return 1;
  59                                 }
  60                         } else {
  61                                 fprintf(stderr, "invalid option: %s\n", argv[i]);
  62                                 print_usage(argv[0]);
  63                                 return 1;
  64                         }
  65                 } else {
  66                         if(fname) {
  67                                 fprintf(stderr, "unexpected argument: %s\n", argv[i]);
  68                                 print_usage(argv[0]);
  69                                 return 1;
  70                         }
  71                         fname = argv[i];
  72                 }
  73         }
  74
  75         if(!fname) {
  76                 fprintf(stderr, "pass the filename of a PNG file\n");
  77                 return 1;
  78         }
  79         if(load_image(&img, fname) == -1) {
  80                 fprintf(stderr, "failed to load PNG file: %s\n", fname);
  81                 return 1;
  82         }
  83
  84         if(img.bpp == 4 && renibble) {
  85                 unsigned char *ptr = img.pixels;
  86                 for(i=0; i<img.width * img.height; i++) {
  87                         unsigned char p = *ptr;
  88                         *ptr++ = (p << 4) | (p >> 4);
  89                 }
  90         }
  91
  92         if(outfname) {
  93                 if(!(out = fopen(outfname, "wb"))) {
  94                         fprintf(stderr, "failed to open output file: %s: %s\n", outfname, strerror(errno));
  95                         return 1;
  96                 }
  97         }
  98
  99         switch(mode) {
 100         case 0:
 101                 fwrite(img.pixels, 1, img.scansz * img.height, out);
 102                 break;
 103
 104         case 1:
 105                 if(text) {
 106                         for(i=0; i<img.cmap_ncolors; i++) {
 107                                 printf("%d %d %d\n", img.cmap[i].r, img.cmap[i].g, img.cmap[i].b);
 108                         }
 109                 } else {
 110                         fwrite(img.cmap, sizeof img.cmap[0], img.cmap_ncolors, out);
 111                 }
 112                 break;
 113
 114         case 2:
 115                 printf("size: %dx%d\n", img.width, img.height);
 116                 printf("bit depth: %d\n", img.bpp);
 117                 printf("scanline size: %d bytes\n", img.scansz);
 118                 if(img.cmap_ncolors > 0) {
 119                         printf("colormap entries: %d\n", img.cmap_ncolors);
 120                 } else {
 121                         printf("color channels: %d\n", img.nchan);
 122                 }
 123                 break;
 124         }
 125
 126         fclose(out);
 127         return 0;
 128 }
 129
 130 void print_usage(const char *argv0)
 131 {
 132         printf("Usage: %s [options] <input file>\n", argv0);
 133         printf("Options:\n");
 134         printf(" -o <output file>: specify output file (default: stdout)\n");
 135         printf(" -p: dump pixels (default)\n");
 136         printf(" -c: dump colormap (palette) entries\n");
 137         printf(" -i: print image information\n");
 138         printf(" -t: dump as text\n");
 139         printf(" -n: swap the order of nibbles (for 4bpp)\n");
 140         printf(" -h: print usage and exit\n");
 141 }