vnc: add a non-adaptive option

This option allow to disable adaptive behaviors in some encodings.

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

3 files changed, 11 insertions, 5 deletions

diff --git a/ui/vnc-enc-tight.c b/ui/vnc-enc-tight.c
index 82c1e96..5933394 100644
--- a/ui/vnc-enc-tight.c
+++ b/ui/vnc-enc-tight.c
@@ -1546,7 +1546,7 @@ static int send_sub_rect(VncState *vs, int x, int y, int w, int h)
     vnc_tight_stop(vs);
 
 #ifdef CONFIG_VNC_JPEG
-    if (vs->tight.quality != (uint8_t)-1) {
+    if (!vs->vd->non_adaptive && vs->tight.quality != (uint8_t)-1) {
         double freq = vnc_update_freq(vs, x, y, w, h);
 
         if (freq < tight_jpeg_conf[vs->tight.quality].jpeg_freq_min) {
diff --git a/ui/vnc.c b/ui/vnc.c
index 86c23207..626b430 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -2387,10 +2387,12 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
     VncState *vs;
     int has_dirty = 0;
 
-    struct timeval tv;
+    struct timeval tv = { 0, 0 };
 
-    gettimeofday(&tv, NULL);
-    has_dirty = vnc_update_stats(vd, &tv);
+    if (!vd->non_adaptive) {
+        gettimeofday(&tv, NULL);
+        has_dirty = vnc_update_stats(vd, &tv);
+    }
 
     /*
      * Walk through the guest dirty map.
@@ -2419,7 +2421,8 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
                 if (memcmp(server_ptr, guest_ptr, cmp_bytes) == 0)
                     continue;
                 memcpy(server_ptr, guest_ptr, cmp_bytes);
-                vnc_rect_updated(vd, x, y, &tv);
+                if (!vd->non_adaptive)
+                    vnc_rect_updated(vd, x, y, &tv);
                 QTAILQ_FOREACH(vs, &vd->clients, next) {
                     set_bit((x / 16), vs->dirty[y]);
                 }
@@ -2754,6 +2757,8 @@ int vnc_display_open(DisplayState *ds, const char *display)
 #endif
         } else if (strncmp(options, "lossy", 5) == 0) {
             vs->lossy = true;
+        } else if (strncmp(options, "non-adapative", 13) == 0) {
+            vs->non_adaptive = true;
         }
     }
 
diff --git a/ui/vnc.h b/ui/vnc.h
index 98a1885..8a1e7b9 100644
--- a/ui/vnc.h
+++ b/ui/vnc.h
@@ -144,6 +144,7 @@ struct VncDisplay
     time_t expires;
     int auth;
     bool lossy;
+    bool non_adaptive;
 #ifdef CONFIG_VNC_TLS
     int subauth; /* Used by VeNCrypt */
     VncDisplayTLS tls;