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From: Jonathan Kew <jkew@mozilla.com>
bug 715798 pt 2 - fall back to show_text_glyphs even at huge sizes if scaled_font_glyph_path didn't work. r=jrmuizel

diff --git a/gfx/cairo/cairo/src/cairo-gstate.c b/gfx/cairo/cairo/src/cairo-gstate.c
--- a/gfx/cairo/cairo/src/cairo-gstate.c
+++ b/gfx/cairo/cairo/src/cairo-gstate.c
@@ -2002,23 +2002,34 @@ cairo_status_t
 	cairo_path_fixed_t path;
 
 	_cairo_path_fixed_init (&path);
 
 	status = _cairo_scaled_font_glyph_path (gstate->scaled_font,
 						transformed_glyphs, num_glyphs,
 						&path);
 
-	if (status == CAIRO_STATUS_SUCCESS) {
+	if (status == CAIRO_STATUS_SUCCESS && !_cairo_path_fixed_fill_is_empty (&path)) {
 	    status = _cairo_surface_fill (gstate->target, op, pattern,
 					  &path,
 					  CAIRO_FILL_RULE_WINDING,
 					  gstate->tolerance,
 					  gstate->scaled_font->options.antialias,
 					  _gstate_get_clip (gstate, &clip));
+	} else {
+	    /* if _cairo_scaled_font_glyph_path() failed, maybe the font doesn't support
+	     * returning paths, so try the _cairo_surface_show_text_glyphs() option
+	     */
+	    status = _cairo_surface_show_text_glyphs (gstate->target, op, pattern,
+						      utf8, utf8_len,
+						      transformed_glyphs, num_glyphs,
+						      transformed_clusters, num_clusters,
+						      cluster_flags,
+						      gstate->scaled_font,
+						      _gstate_get_clip (gstate, &clip));
 	}
 
 	_cairo_path_fixed_fini (&path);
     }
 
     _cairo_clip_fini (&clip);
 
 CLEANUP_GLYPHS: