#include <stdio.h>
#include <sys/time.h>
#include <X11/Xlib.h>
#include <cairo-xlib.h>

int
main (int argc, char **argv)
{
	Display *display;
	Window root;
	int screen;
	int screen_width, screen_height;
	int temp_width, temp_height;
	Pixmap back_pixmap;
	Pixmap temp_pixmap;
	Visual *visual;
	cairo_surface_t *back_surface, *temp_surface;
	cairo_t *cr;
	cairo_pattern_t *pattern;
	struct timeval start, end, elapsed;
	double total;

	display = XOpenDisplay (NULL);
	XSynchronize (display, 1);

	screen = DefaultScreen (display);
	root = DefaultRootWindow (display);

	screen_width = DisplayWidth (display, screen);
	screen_height = DisplayHeight (display, screen);

	temp_width = screen_width;
	temp_height = screen_height - 29; /* think of this as the height of the GNOME Panel */

	back_pixmap = XCreatePixmap (display, root, screen_width, screen_height, DefaultDepth (display, screen)); /* desktop background */
	temp_pixmap = XCreatePixmap (display, root, temp_width, temp_height, DefaultDepth (display, screen)); /* double-buffer */

	visual = DefaultVisual (display, screen);
	back_surface = cairo_xlib_surface_create (display, back_pixmap, visual, screen_width, screen_height);
	temp_surface = cairo_xlib_surface_create (display, temp_pixmap, visual, temp_width, temp_height);

	cr = cairo_create (temp_surface);

	pattern = cairo_pattern_create_for_surface (back_surface);
	cairo_surface_destroy (back_surface);

	cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
	cairo_set_source (cr, pattern);
	cairo_pattern_destroy (pattern);

	cairo_rectangle (cr, 0, 0, temp_width, temp_height);

	cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
	gettimeofday (&start, NULL);
	cairo_fill (cr);
	gettimeofday (&end, NULL);

	if (start.tv_usec > end.tv_usec) {
		end.tv_usec += 1000000;
		end.tv_sec--;
	}

	elapsed.tv_usec = end.tv_usec - start.tv_usec;
	elapsed.tv_sec = end.tv_sec - start.tv_sec;

	total = elapsed.tv_sec + ((double) elapsed.tv_usec / 1e6);

	printf ("cairo_fill() time: %f sec\n", total);

	return 0;
}