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vnc: add configurable keyboard delay

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Limits the rate kbd events from the vnc server are forwarded to the
guest, so input devices which are typically low-bandwidth can keep
up even on bulky input.

v2: update documentation too.
v3: spell fixes.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Yang Hongyang <hongyang.yang@easystack.cn>
Message-id: 1464762150-25817-1-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2016-06-01 08:22:30 +02:00
parent 8efa5f29f8
commit c5ce833344
3 changed files with 20 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

13
ui/vnc.c
View file

@ -1629,6 +1629,7 @@ static void reset_keys(VncState *vs)
for(i = 0; i < 256; i++) {
if (vs->modifiers_state[i]) {
qemu_input_event_send_key_number(vs->vd->dcl.con, i, false);
qemu_input_event_send_key_delay(vs->vd->key_delay_ms);
vs->modifiers_state[i] = 0;
}
}
@ -1638,9 +1639,9 @@ static void press_key(VncState *vs, int keysym)
{
int keycode = keysym2scancode(vs->vd->kbd_layout, keysym) & SCANCODE_KEYMASK;
qemu_input_event_send_key_number(vs->vd->dcl.con, keycode, true);
qemu_input_event_send_key_delay(0);
qemu_input_event_send_key_delay(vs->vd->key_delay_ms);
qemu_input_event_send_key_number(vs->vd->dcl.con, keycode, false);
qemu_input_event_send_key_delay(0);
qemu_input_event_send_key_delay(vs->vd->key_delay_ms);
}
static int current_led_state(VncState *vs)
@ -1792,6 +1793,7 @@ static void do_key_event(VncState *vs, int down, int keycode, int sym)
if (qemu_console_is_graphic(NULL)) {
qemu_input_event_send_key_number(vs->vd->dcl.con, keycode, down);
qemu_input_event_send_key_delay(vs->vd->key_delay_ms);
} else {
bool numlock = vs->modifiers_state[0x45];
bool control = (vs->modifiers_state[0x1d] ||
@ -1913,6 +1915,7 @@ static void vnc_release_modifiers(VncState *vs)
continue;
}
qemu_input_event_send_key_number(vs->vd->dcl.con, keycode, false);
qemu_input_event_send_key_delay(vs->vd->key_delay_ms);
}
}
@ -3277,6 +3280,9 @@ static QemuOptsList qemu_vnc_opts = {
},{
.name = "lock-key-sync",
.type = QEMU_OPT_BOOL,
},{
.name = "key-delay-ms",
.type = QEMU_OPT_NUMBER,
},{
.name = "sasl",
.type = QEMU_OPT_BOOL,
@ -3515,6 +3521,7 @@ void vnc_display_open(const char *id, Error **errp)
#endif
int acl = 0;
int lock_key_sync = 1;
int key_delay_ms;
if (!vs) {
error_setg(errp, "VNC display not active");
@ -3633,6 +3640,7 @@ void vnc_display_open(const char *id, Error **errp)
reverse = qemu_opt_get_bool(opts, "reverse", false);
lock_key_sync = qemu_opt_get_bool(opts, "lock-key-sync", true);
key_delay_ms = qemu_opt_get_number(opts, "key-delay-ms", 1);
sasl = qemu_opt_get_bool(opts, "sasl", false);
#ifndef CONFIG_VNC_SASL
if (sasl) {
@ -3764,6 +3772,7 @@ void vnc_display_open(const char *id, Error **errp)
}
#endif
vs->lock_key_sync = lock_key_sync;
vs->key_delay_ms = key_delay_ms;
device_id = qemu_opt_get(opts, "display");
if (device_id) {

1
ui/vnc.h
View file

@ -155,6 +155,7 @@ struct VncDisplay
DisplayChangeListener dcl;
kbd_layout_t *kbd_layout;
int lock_key_sync;
int key_delay_ms;
QemuMutex mutex;
QEMUCursor *cursor;