From de25fec06bbdbb3cf458aefb4e3b9d2271022b9c Mon Sep 17 00:00:00 2001
From: Andrea Canciani <ranma42@gmail.com>
Date: Wed, 27 Jul 2011 21:50:45 +0200
Subject: [PATCH] test: Improve horizontal-clip

The bug pointed out by this test now causes failures in xcb and xlib.
---
 test/horizontal-clip.c       |  39 ++++++++++++++++++-----------------
 test/horizontal-clip.ref.png | Bin 115 -> 129 bytes
 2 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/test/horizontal-clip.c b/test/horizontal-clip.c
index 2a5025cfc..93127a722 100644
--- a/test/horizontal-clip.c
+++ b/test/horizontal-clip.c
@@ -29,10 +29,11 @@
 
 #include "cairo-test.h"
 
-#define WIDTH 20
-#define HEIGHT 20
+#define WIDTH 16
+#define HEIGHT 26
 
-#define BUG 1
+#define BUGY 1
+#define BUGX (4 * BUGY * WIDTH * 256)
 
 static cairo_test_status_t
 draw (cairo_t *cr, int width, int height)
@@ -41,28 +42,28 @@ draw (cairo_t *cr, int width, int height)
     cairo_paint (cr);
     cairo_set_source_rgb (cr, 0, 0, 0);
 
-    cairo_move_to (cr, 0-256, 4 - BUG);
-    cairo_line_to (cr, WIDTH + 256, 4 + BUG);
-    cairo_line_to (cr, WIDTH + 256, 2 - BUG);
-    cairo_line_to (cr, 0-256, 2 + BUG);
+    cairo_move_to (cr,       - BUGX, 6 - BUGY);
+    cairo_line_to (cr,       + BUGX, 6 + BUGY);
+    cairo_line_to (cr, WIDTH + BUGX, 2 - BUGY);
+    cairo_line_to (cr, WIDTH - BUGX, 2 + BUGY);
     cairo_fill (cr);
 
-    cairo_move_to (cr, 0-256, 6 - BUG);
-    cairo_line_to (cr, WIDTH + 256, 6 + BUG);
-    cairo_line_to (cr, WIDTH + 256, 8 - BUG);
-    cairo_line_to (cr, 0-256, 8 + BUG);
+    cairo_move_to (cr, WIDTH + BUGX, 8  - BUGY);
+    cairo_line_to (cr, WIDTH - BUGX, 8  + BUGY);
+    cairo_line_to (cr,       - BUGX, 12 - BUGY);
+    cairo_line_to (cr,       + BUGX, 12 + BUGY);
     cairo_fill (cr);
 
-    cairo_move_to (cr, WIDTH+256, 12 - BUG);
-    cairo_line_to (cr, 0-256, 12 + BUG);
-    cairo_line_to (cr, 0-256, 14 - BUG);
-    cairo_line_to (cr, WIDTH+256, 14 + BUG);
+    cairo_move_to (cr,       - BUGX, 14 - BUGY);
+    cairo_line_to (cr,       + BUGX, 14 + BUGY);
+    cairo_line_to (cr, WIDTH + BUGX, 18 - BUGY);
+    cairo_line_to (cr, WIDTH - BUGX, 18 + BUGY);
     cairo_fill (cr);
 
-    cairo_move_to (cr, WIDTH+256, 18 - BUG);
-    cairo_line_to (cr, 0-256, 18 + BUG);
-    cairo_line_to (cr, 0-256, 16 - BUG);
-    cairo_line_to (cr, WIDTH+256, 16 + BUG);
+    cairo_move_to (cr, WIDTH + BUGX, 24 - BUGY);
+    cairo_line_to (cr, WIDTH - BUGX, 24 + BUGY);
+    cairo_line_to (cr,       - BUGX, 20 - BUGY);
+    cairo_line_to (cr,       + BUGX, 20 + BUGY);
     cairo_fill (cr);
 
     return CAIRO_TEST_SUCCESS;
diff --git a/test/horizontal-clip.ref.png b/test/horizontal-clip.ref.png
index 51d9445783cd1179dcde0ee2fc39caef704f82ee..f07e03578c1838ae8c2c21391a9e7a6a657e0093 100644
GIT binary patch
delta 116
zcmXSJWK`@7@N?(olHy`uVBq!ia0vp^0zfRq!2~1?xx51=DvElWdAc};So9|U`TyUZ
zS+k*2<?3M;gMHQC`%HM3u)Qu|*ut;s=IH1+$%MzrVbgNYbA^i+y6`YC><t$A{dUo{
Qbf8HLp00i_>zopr0O5!ui2wiq

delta 102
zcmZo<ELQ9c@N?(olHy`uVBq!ia0vp^A|TAc1SFYWcSTK96t&gxba4!^=uQ6f|Gz!+
z&W6sMxy)P=?tgux7MwWGyu9+kfebEX!GI^}4BxNwv$Fo#mk89$;OXk;vd$@?2>@Q-
BA94Ty