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[Qemu-commits] [COMMIT 3e28c9a] vnc: fix copyrect screen corruption


From: Anthony Liguori
Subject: [Qemu-commits] [COMMIT 3e28c9a] vnc: fix copyrect screen corruption
Date: Mon, 10 Aug 2009 21:47:59 -0000

From: Gerd Hoffmann <address@hidden>

When sending a copyrect command to the vnc client, we must also update
the local server surface.  Otherwise the server's and the client's idea
of the screen content run out of sync and screen updates don't work
correctly.

Signed-off-by: Anthony Liguori <address@hidden>

diff --git a/vnc.c b/vnc.c
index dfcf34c..903dd95 100644
--- a/vnc.c
+++ b/vnc.c
@@ -654,6 +654,11 @@ static void send_framebuffer_update(VncState *vs, int x, 
int y, int w, int h)
 
 static void vnc_copy(VncState *vs, int src_x, int src_y, int dst_x, int dst_y, 
int w, int h)
 {
+    uint8_t *src_row;
+    uint8_t *dst_row;
+    int y,pitch,depth;
+
+    /* send bitblit op to the vnc client */
     vnc_write_u8(vs, 0);  /* msg id */
     vnc_write_u8(vs, 0);
     vnc_write_u16(vs, 1); /* number of rects */
@@ -661,6 +666,23 @@ static void vnc_copy(VncState *vs, int src_x, int src_y, 
int dst_x, int dst_y, i
     vnc_write_u16(vs, src_x);
     vnc_write_u16(vs, src_y);
     vnc_flush(vs);
+
+    /* do bitblit op on the local surface too */
+    pitch = ds_get_linesize(vs->ds);
+    depth = ds_get_bytes_per_pixel(vs->ds);
+    src_row = vs->server.ds->data + pitch * src_y + depth * src_x;
+    dst_row = vs->server.ds->data + pitch * dst_y + depth * dst_x;
+    if (dst_y > src_y) {
+        /* copy backwards */
+        src_row += pitch * (h-1);
+        dst_row += pitch * (h-1);
+        pitch = -pitch;
+    }
+    for (y = 0; y < h; y++) {
+        memmove(dst_row, src_row, w * depth);
+        src_row += pitch;
+        dst_row += pitch;
+    }
 }
 
 static void vnc_dpy_copy(DisplayState *ds, int src_x, int src_y, int dst_x, 
int dst_y, int w, int h)




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