From a04e3726648c62a1385b67cfc16a785a468e1d13 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sun, 5 Jul 2009 09:21:47 +0100
Subject: [PATCH] [path] Add path watch debugging

Simple debug macro to print the path to stderr during construction.
---
 src/cairo-path-fixed-private.h |  9 +++++++++
 src/cairo-path-fixed.c         | 26 ++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/src/cairo-path-fixed-private.h b/src/cairo-path-fixed-private.h
index 5df184938..c7101e9f8 100644
--- a/src/cairo-path-fixed-private.h
+++ b/src/cairo-path-fixed-private.h
@@ -39,6 +39,11 @@
 #include "cairo-types-private.h"
 #include "cairo-compiler-private.h"
 
+#define WATCH_PATH 0
+#if WATCH_PATH
+#include <stdio.h>
+#endif
+
 enum cairo_path_op {
     CAIRO_PATH_OP_MOVE_TO = 0,
     CAIRO_PATH_OP_LINE_TO = 1,
@@ -110,6 +115,10 @@ _cairo_path_fixed_iter_at_end (const cairo_path_fixed_iter_t *iter);
 static inline cairo_bool_t
 _cairo_path_fixed_is_region (cairo_path_fixed_t *path)
 {
+#if WATCH_PATH
+    fprintf (stderr, "_cairo_path_fixed_is_region () = %s\n",
+	     path->is_region ? "true" : "false");
+#endif
     return path->is_region;
 }
 
diff --git a/src/cairo-path-fixed.c b/src/cairo-path-fixed.c
index 5574e2d1e..1cc86c53b 100644
--- a/src/cairo-path-fixed.c
+++ b/src/cairo-path-fixed.c
@@ -574,6 +574,32 @@ _cairo_path_fixed_add (cairo_path_fixed_t   *path,
 	_cairo_path_fixed_add_buf (path, buf);
     }
 
+    if (WATCH_PATH) {
+	const char *op_str[] = {
+	    "move-to",
+	    "line-to",
+	    "curve-to",
+	    "close-path",
+	};
+	char buf[1024];
+	int len = 0;
+	int i;
+
+	len += snprintf (buf + len, sizeof (buf), "[");
+	for (i = 0; i < num_points; i++) {
+	    if (i != 0)
+		len += snprintf (buf + len, sizeof (buf), " ");
+	    len += snprintf (buf + len, sizeof (buf), "(%f, %f)",
+			     _cairo_fixed_to_double (points[i].x),
+			     _cairo_fixed_to_double (points[i].y));
+	}
+	len += snprintf (buf + len, sizeof (buf), "]");
+
+	fprintf (stderr,
+		 "_cairo_path_fixed_add (%s, %s)\n",
+		 op_str[(int) op], buf);
+    }
+
     _cairo_path_buf_add_op (buf, op);
     _cairo_path_buf_add_points (buf, points, num_points);