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