[test] Update big-line and remove XFAIL

Now that we use polygon clipping, output geometry should no longer exceed
the 2^16 limits imposed by pixman. For the image backend, we now use spans
for stroking and for the xlib backend we have to double check the range on
the output trapezoids. In short, cairo should pass this test.

test/Makefile.am

@@ -138,10 +138,10 @@ REFERENCE_IMAGES = \
 	alpha-similar.rgb24.ref.png \
 	alpha-similar.svg.argb32.xfail.png \
 	alpha-similar.svg.rgb24.xfail.png \
-	big-line.ps.argb32.ref.png \
-	big-line.ps.rgb24.ref.png \
-	big-line.quartz.ref.png \
-	big-line.quartz.rgb24.ref.png \
+	big-line.ref.png \
+	big-line.ps.ref.png \
+	big-line.xlib.png \
+	big-line.xlib-fallback.png \
 	bilevel-image.ref.png \
 	bitmap-font.ref.png \
 	bitmap-font.rgb24.ref.png \

test/big-line.c

@@ -28,35 +28,35 @@
 static cairo_test_status_t
 draw (cairo_t *cr, int width, int height)
 {
-    cairo_new_path (cr);
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
 
     cairo_set_source_rgb (cr, 1, 1, 0);
     cairo_move_to (cr, 50, 50);
-    cairo_line_to (cr, 50000, 50000);
+    cairo_rel_line_to (cr, 50000, 50000);
     cairo_stroke (cr);
 
     cairo_set_source_rgb (cr, 1, 0, 0);
     cairo_move_to (cr, 50, 50);
-    cairo_line_to (cr, -50000, 50000);
+    cairo_rel_line_to (cr, -50000, 50000);
     cairo_stroke (cr);
 
     cairo_set_source_rgb (cr, 0, 1, 0);
     cairo_move_to (cr, 50, 50);
-    cairo_line_to (cr, 50000, -50000);
+    cairo_rel_line_to (cr, 50000, -50000);
     cairo_stroke (cr);
 
     cairo_set_source_rgb (cr, 0, 0, 1);
     cairo_move_to (cr, 50, 50);
-    cairo_line_to (cr, -50000, -50000);
+    cairo_rel_line_to (cr, -50000, -50000);
     cairo_stroke (cr);
 
     return CAIRO_TEST_SUCCESS;
 }
 
 CAIRO_TEST (big_line,
-	    "Test drawing of simple lines with positive and negative coordinates > 2^16\n"
-	    "This currently fails because of 16-bit limitations in pixman.",
-	    "line", /* keywords */
+	    "Test drawing of simple lines with positive and negative coordinates > 2^16",
+	    "stroke, line", /* keywords */
 	    NULL, /* requirements */
 	    100, 100,
 	    NULL, draw)