#include <cairo.h>
#include <stdio.h>

int main (int argc, char *argv[])
{
  cairo_t *first_cr, *second_cr;
  cairo_surface_t *first, *second;
  int i;

  first = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 20, 20);
  second = cairo_image_surface_create(CAIRO_FORMAT_A8, 10, 10);
  cairo_surface_set_device_offset(second, -6, -6);

  first_cr = cairo_create(first);
  cairo_scale(first_cr, 0.5, 0.5);
  cairo_set_source_rgb(first_cr, 0, 0, 0.4);
  cairo_rectangle(first_cr, 6, 6, 10, 10);
  cairo_fill(first_cr);

  second_cr = cairo_create(second);
  cairo_rectangle(second_cr, 6, 6, 10, 10);
  cairo_fill(second_cr);

  cairo_set_source_rgb(first_cr, 0.5, 0.5, 0);
  cairo_mask_surface(first_cr, second, 0, 0);

  unsigned char* data = cairo_image_surface_get_data(first);
  int stride = cairo_image_surface_get_stride(first);
  int size = stride * cairo_image_surface_get_height(first);

  printf("\"first\" - ARGB32 surface\n----------------------------\n");

  for (i = 0; i < size; i++) {
    if (i!= 0 && i % stride == 0)
      printf("|\n");
    else if (i!=0 && i % 4 == 0)
      printf(", ");

    printf("%u ", data[i]);
  }

  printf("\n");

  cairo_surface_destroy(first);
  cairo_surface_destroy(second);

  cairo_destroy(first_cr);
  cairo_destroy(second_cr);

  return 0;
}