git.mutantstargoat.com Git - mdlife/blob - tools/pngdump/tiles.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include "tiles.h"
   5 #include "image.h"
   6
   7 int img2tiles(struct tilemap *tmap, struct image *img, int tw, int th, int dedup)
   8 {
   9         int i, j, x, y, tx, ty, tileoffs, xtiles, ytiles, ntiles;
  10         struct image orig;
  11         unsigned int pix;
  12
  13         if(alloc_image(&orig, img->width, img->height, img->bpp) == -1) {
  14                 fprintf(stderr, "img2tiles: failed to allocate temporary image\n");
  15                 return -1;
  16         }
  17         memcpy(orig.pixels, img->pixels, img->scansz * img->height);
  18
  19         xtiles = (img->width + tw - 1) / tw;
  20         ytiles = (img->height + th - 1) / th;
  21         ntiles = xtiles * ytiles;
  22
  23         img->width = tw;
  24         img->height = ntiles * th;
  25         img->pitch = img->scansz = tw * img->bpp / 8;
  26
  27         if(tmap) {
  28                 tmap->width = xtiles;
  29                 tmap->height = ytiles;
  30                 if(!(tmap->map = malloc(ntiles * sizeof *tmap->map))) {
  31                         fprintf(stderr, "failed to allocate tilemap\n");
  32                         free(orig.pixels);
  33                         return -1;
  34                 }
  35         }
  36
  37         tileoffs = 0;
  38         y = 0;
  39         for(i=0; i<ytiles; i++) {
  40                 x = 0;
  41                 for(j=0; j<xtiles; j++) {
  42                         for(ty=0; ty<th; ty++) {
  43                                 for(tx=0; tx<tw; tx++) {
  44                                         pix = get_pixel(&orig, x + tx, y + ty);
  45                                         put_pixel(img, tx, ty + tileoffs, pix);
  46                                 }
  47                         }
  48                         tileoffs += th; /* destination Y offset, inc by th for every tile */
  49                         x += tw;
  50                 }
  51                 y += th;
  52         }
  53
  54         free(orig.pixels);
  55         return 0;
  56 }
  57
  58 int dump_tilemap(struct tilemap *tmap, const char *fname)
  59 {
  60         return -1;
  61 }