From 0486e8a71462430438a1ac593db0ffe0fb38b9a8 Mon Sep 17 00:00:00 2001
From: balrog <balrog@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Tue, 11 Dec 2007 22:31:32 +0000
Subject: [PATCH] Fix fragments due to incomplete dirty tracking in CGA mode
 (Anthony Liguori).

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3809 c046a42c-6fe2-441c-8c8c-71466251a162
---
 vnc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/vnc.c b/vnc.c
index fcce00eddc..b20fe21d7d 100644
--- a/vnc.c
+++ b/vnc.c
@@ -258,6 +258,13 @@ static void vnc_dpy_update(DisplayState *ds, int x, int y, int w, int h)
 
     h += y;
 
+    /* round x down to ensure the loop only spans one 16-pixel block per,
+       iteration.  otherwise, if (x % 16) != 0, the last iteration may span
+       two 16-pixel blocks but we only mark the first as dirty
+    */
+    w += (x % 16);
+    x -= (x % 16);
+
     for (; y < h; y++)
 	for (i = 0; i < w; i += 16)
 	    vnc_set_bit(vs->dirty_row[y], (x + i) / 16);
-- 
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