#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define PNG_DEBUG 3
#include <png.h>

int width = 64, height = 64;
png_color pal[2] = {{255,20,11},{0,17,255}};

unsigned char rowtowriterepeatedly[64] = {
  1,0,1,0,0,0,1,0,1,1,0,1,0,1,1,1,
  1,0,1,0,0,0,1,0,1,1,0,1,0,1,1,1,
  1,0,1,0,0,0,1,0,1,1,0,1,0,1,1,1,
  1,0,1,0,0,0,1,0,1,1,0,1,0,1,1,1};
int main(int argc, char **argv)
{
  int i;
  png_structp png_ptr;
  png_infop info_ptr;
  FILE *fp = fopen("out.png", "wb");
  if (!fp) {
    printf("error'd: unable to open file");
    return 1;
  }
  
  png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
  if (!png_ptr) {
    printf("[write_png_file] png_create_write_struct failed");
    return 1;
  }

  info_ptr = png_create_info_struct(png_ptr);
  if (!info_ptr) {
    printf("[write_png_file] png_create_info_struct failed");
    return 1;
  }

  if (setjmp(png_jmpbuf(png_ptr))) {
    printf("error'd: writing error");
    return 1;
  }
  png_init_io(png_ptr, fp);
  png_set_IHDR(png_ptr, info_ptr, width, height,
         8, PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
         PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
  png_set_PLTE(png_ptr, info_ptr, pal, 2);

  png_write_info(png_ptr, info_ptr);
  
  for (i=0;i<height;i++) {
    png_write_row(png_ptr, rowtowriterepeatedly);
  }

  png_write_end(png_ptr, NULL);
  fclose(fp);
  return 0;
}