@@ -828,6 +828,13 @@ empty, with a @code{deny} policy. Thus no one will be allowed to
use the VNC server until the ACLs have been loaded. This can be
achieved using the @code{acl} monitor command.
+@item lossy
+
+Enable lossy compression methods (gradient, JPEG, ...). If this
+option is set, VNC client may receive lossy framebuffer updates
+depending on its encoding settings. Enabling this option can save
+a lot of bandwidth at the expense of quality.
+
@end table
ETEXI
@@ -230,6 +230,10 @@ tight_detect_smooth_image(VncState *vs, int w, int h)
int compression = vs->tight_compression;
int quality = vs->tight_quality;
+ if (!vs->vd->lossy) {
+ return 0;
+ }
+
if (ds_get_bytes_per_pixel(vs->ds) == 1 ||
vs->clientds.pf.bytes_per_pixel == 1 ||
w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) {
@@ -2482,6 +2482,8 @@ int vnc_display_open(DisplayState *ds, const char *display)
#endif
} else if (strncmp(options, "acl", 3) == 0) {
acl = 1;
+ } else if (strncmp(options, "lossy", 5) == 0) {
+ vs->lossy = true;
}
}
@@ -33,6 +33,7 @@
#include "monitor.h"
#include "audio/audio.h"
#include <zlib.h>
+#include <stdbool.h>
#include "keymaps.h"
@@ -111,6 +112,7 @@ struct VncDisplay
char *display;
char *password;
int auth;
+ bool lossy;
#ifdef CONFIG_VNC_TLS
int subauth; /* Used by VeNCrypt */
VncDisplayTLS tls;
The lossy option can be used to enable lossy compression methods like gradient or jpeg. This patch disable them by default. Signed-off-by: Corentin Chary <corentincj@iksaif.net> --- qemu-options.hx | 7 +++++++ vnc-encoding-tight.c | 4 ++++ vnc.c | 2 ++ vnc.h | 2 ++ 4 files changed, 15 insertions(+), 0 deletions(-)