fixes and tests

tests/herringbone_map.c

@@ -0,0 +1,82 @@
+#include <stdio.h>
+
+#define STB_HBWANG_MAX_X  500
+#define STB_HBWANG_MAX_Y  500
+
+#define STB_HERRINGBONE_WANG_TILE_IMPLEMENTATION
+#include "stb_herringbone_wang_tile.h"
+
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include "stb_image_write.h"
+
+int main(int argc, char **argv)
+{
+   if (argc < 5) {
+      fprintf(stderr, "Usage: herringbone_map {inputfile} {output-width} {output-height} {outputfile}\n");
+      return 1;
+   } else {
+	   char *filename = argv[1];
+      int out_w = atoi(argv[2]);
+	   int out_h = atoi(argv[3]);
+      char *outfile = argv[4];
+
+	   unsigned char *pixels, *out_pixels;
+	   stbhw_tileset ts;
+	   int w,h;
+
+	   pixels = stbi_load(filename, &w, &h, 0, 3);
+      if (pixels == 0) {
+         fprintf(stderr, "Could open input file '%s'\n", filename);
+      }
+
+	   if (!stbhw_build_tileset_from_image(&ts, pixels, w*3, w, h)) {
+		   fprintf(stderr, "Error: %s\n", stbhw_get_last_error());
+		   return 1;
+	   }
+
+	   free(pixels);
+
+      #ifdef DEBUG_OUTPUT
+      {
+         int i,j,k;
+         // add blue borders to top-left edges of the tiles
+         int hstride = (ts.short_side_len*2)*3;
+         int vstride = (ts.short_side_len  )*3;
+         for (i=0; i < ts.num_h_tiles; ++i) {
+            unsigned char *pix = ts.h_tiles[i]->pixels;
+            for (j=0; j < ts.short_side_len*2; ++j)
+               for (k=0; k < 3; ++k)
+                  pix[j*3+k] = (pix[j*3+k]*0.5+100+k*75)/1.5;
+            for (j=1; j < ts.short_side_len; ++j)
+               for (k=0; k < 3; ++k)
+                  pix[j*hstride+k] = (pix[j*hstride+k]*0.5+100+k*75)/1.5;
+         }
+         for (i=0; i < ts.num_v_tiles; ++i) {
+            unsigned char *pix = ts.v_tiles[i]->pixels;
+            for (j=0; j < ts.short_side_len; ++j)
+               for (k=0; k < 3; ++k)
+                  pix[j*3+k] = (pix[j*3+k]*0.5+100+k*75)/1.5;
+            for (j=1; j < ts.short_side_len*2; ++j)
+               for (k=0; k < 3; ++k)
+                  pix[j*vstride+k] = (pix[j*vstride+k]*0.5+100+k*75)/1.5;
+         }
+      }
+      #endif
+
+	   out_pixels = malloc(out_w * out_h * 3);
+
+	   if (!stbhw_generate_image(&ts, NULL, out_pixels, out_w*3, out_w, out_h)) {
+		   fprintf(stderr, "Error: %s\n", stbhw_get_last_error());
+		   return 1;
+	   }
+
+	   stbi_write_png(argv[4], out_w, out_h, 3, out_pixels, out_w*3);
+	   free(out_pixels);
+
+	   stbhw_free_tileset(&ts);
+	   return 0;
+   }
+}