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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>
This commit is contained in:
Corentin Chary 2011-02-04 09:06:08 +01:00 committed by Anthony Liguori
parent 8cb4a6b755
commit 80e0c8c39b
4 changed files with 20 additions and 5 deletions
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9
qemu-options.hx
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@ -913,6 +913,15 @@ 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.
@item non-adaptive
Disable adaptive encodings. Adaptive encodings are enabled by default.
An adaptive encoding will try to detect frequently updated screen regions,
and send updates in these regions using a lossy encoding (like JPEG).
This can be really helpfull to save bandwidth when playing videos. Disabling
adaptive encodings allow to restore the original static behavior of encodings
like Tight.
@end table
ETEXI

2
ui/vnc-enc-tight.c
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@ -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) {

13
ui/vnc.c
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@ -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;
}
}

1
ui/vnc.h
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@ -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;