/* gcc `pkg-config --cflags --libs cairo` testcase-7494.c -o testcase-7494 */
#include <stdio.h>
#include <stdlib.h>

#include <cairo.h>
#include <cairo-xlib.h>

/* This is a simple test case for demonstrating cairo bug #7494:
 *
 *	With cairo 1.2.0, non-antialiased xlib text doesn't appear after first space
 *	https://bugs.freedesktop.org/show_bug.cgi?id=7494
 *
 * This testcase simply uses the default font, but disables
 * antialiasing to demonstrate bug #7494. The correct behavior would
 * be for both of the characters "a" and "b" to appear. The buggy
 * behavior is that only the character "a" appears.
 */

static void
draw (cairo_t *cr, int width, int height)
{
    cairo_font_options_t *font_options;

    cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
    cairo_paint (cr);
    cairo_move_to (cr, 20, 20);
    cairo_set_font_size (cr, 12);
    font_options = cairo_font_options_create ();
    cairo_font_options_set_antialias (font_options, CAIRO_ANTIALIAS_NONE);
    cairo_set_font_options (cr, font_options);
    cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */
    cairo_show_text (cr, "a b");
}

static void
xlib_draw (Display *dpy, Window window, int width, int height)
{
    cairo_surface_t *surface;
    cairo_t *cr;

    surface = cairo_xlib_surface_create (dpy, window,
					 DefaultVisual (dpy, DefaultScreen (dpy)),
					 width, height);
    cr = cairo_create (surface);

    draw (cr, width, height);

    if (cairo_status (cr)) {
	printf("Cairo is unhappy: %s\n",
	       cairo_status_to_string (cairo_status (cr)));
	exit(0);
    }

    cairo_destroy (cr);
    cairo_surface_destroy (surface);
}

static void
handle_events(Display *dpy, Window window, int width, int height)
{
    XEvent xev;
    KeyCode quit_code = XKeysymToKeycode (dpy, XStringToKeysym("Q"));

    while (1) {
	XNextEvent (dpy, &xev);
	switch (xev.type) {
	case KeyPress:
	    if (xev.xkey.keycode == quit_code)
		return;
	break;
	case ConfigureNotify:
	    width = xev.xconfigure.width;
	    height = xev.xconfigure.height;
	break;
	case Expose:
	    if (xev.xexpose.count == 0)
		xlib_draw (dpy, window, width, height);
	break;
	}
    }
}

int
main (int argc, char *argv[])
{
    Display *dpy;
    Window root, window;
    int width = 400, height = 400;

    dpy = XOpenDisplay (NULL);

    if (dpy == NULL) {
	fprintf(stderr, "Failed to open display %s\n", XDisplayName(NULL));
	return 1;
    }

    window = XCreateSimpleWindow(dpy, DefaultRootWindow (dpy),
				 0, 0, width, height, 0,
				 WhitePixel(dpy, DefaultScreen (dpy)),
				 WhitePixel(dpy, DefaultScreen (dpy)));

    XSelectInput(dpy, window,
		 KeyPressMask | StructureNotifyMask | ExposureMask);

    XMapWindow (dpy, window);

    handle_events (dpy, window, width, height);

    XDestroyWindow (dpy, window);
    XCloseDisplay (dpy);

    return 0;
}