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vnc: add lossy option
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> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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@ -835,6 +835,13 @@ empty, with a @code{deny} policy. Thus no one will be allowed to
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use the VNC server until the ACLs have been loaded. This can be
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achieved using the @code{acl} monitor command.
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@item lossy
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Enable lossy compression methods (gradient, JPEG, ...). If this
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option is set, VNC client may receive lossy framebuffer updates
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depending on its encoding settings. Enabling this option can save
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a lot of bandwidth at the expense of quality.
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@end table
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ETEXI
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@ -228,6 +228,10 @@ tight_detect_smooth_image(VncState *vs, int w, int h)
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int compression = vs->tight_compression;
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int quality = vs->tight_quality;
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if (!vs->vd->lossy) {
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return 0;
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}
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if (ds_get_bytes_per_pixel(vs->ds) == 1 ||
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vs->clientds.pf.bytes_per_pixel == 1 ||
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w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) {
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2
vnc.c
2
vnc.c
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@ -2482,6 +2482,8 @@ int vnc_display_open(DisplayState *ds, const char *display)
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#endif
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} else if (strncmp(options, "acl", 3) == 0) {
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acl = 1;
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} else if (strncmp(options, "lossy", 5) == 0) {
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vs->lossy = true;
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}
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}
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2
vnc.h
2
vnc.h
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@ -33,6 +33,7 @@
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#include "monitor.h"
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#include "audio/audio.h"
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#include <zlib.h>
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#include <stdbool.h>
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#include "keymaps.h"
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@ -111,6 +112,7 @@ struct VncDisplay
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char *display;
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char *password;
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int auth;
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bool lossy;
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#ifdef CONFIG_VNC_TLS
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int subauth; /* Used by VeNCrypt */
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VncDisplayTLS tls;
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