#include <cairo.h>
#include <X11/X.h>
#include <cairo-svg.h>
#include <stdio.h>

typedef struct
{
  FILE *out;
} png_stream_to_file_closure_t;


static cairo_status_t
write_png_stream_to_file(void *in_closure, const unsigned char *data, unsigned int length)
{
  png_stream_to_file_closure_t *closure = (png_stream_to_file_closure_t *)in_closure;

  size_t wsize = fwrite((void *)data, length, 1, closure->out);

  return CAIRO_STATUS_SUCCESS;
}


int main()
{
  cairo_surface_t *surf;
  cairo_t *cr;
  double width = 8000;
  double height = 8000;
  
  surf = cairo_svg_surface_create("foo.png", width, height);
  cr = cairo_create(surf);

  cairo_rectangle(cr, 10, 10, width-20, height-20);
  cairo_set_source_rgb(cr, 1.0, 0.5, 0.0);
  cairo_fill(cr);

  cairo_set_source_rgb(cr, 0.0, 1.0, 1.0);
  cairo_move_to(cr, 10.0, 10.0);
  cairo_line_to(cr, width-10, height-10);
  cairo_stroke(cr);

  png_stream_to_file_closure_t foo_closure;
  foo_closure.out = fopen("foo.png", "wb");

  cairo_status_t status;
  status = cairo_surface_write_to_png_stream(surf, write_png_stream_to_file, &foo_closure);
  if (status != CAIRO_STATUS_SUCCESS)  {
  	printf("error writing png: %s\n", cairo_status_to_string(status));
  }

  return 0;
}