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ui: refactor code for determining if an update should be sent to the client 

The logic for determining if it is possible to send an update to the client
will become more complicated shortly, so pull it out into a separate method
for easier extension later.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20171218191228.31018-9-berrange@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Daniel P. Berrange 2017-12-18 19:12:23 +00:00 committed by Gerd Hoffmann
parent 728a7ac954
commit 0bad834228
1 changed files with 20 additions and 7 deletions
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27
ui/vnc.c
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@ -961,6 +961,25 @@ static int find_and_clear_dirty_height(VncState *vs,
return h;
}
static bool vnc_should_update(VncState *vs)
{
switch (vs->update) {
case VNC_STATE_UPDATE_NONE:
break;
case VNC_STATE_UPDATE_INCREMENTAL:
/* Only allow incremental updates if the output buffer
* is empty, or if audio capture is enabled.
*/
if (!vs->output.offset || vs->audio_cap) {
return true;
}
break;
case VNC_STATE_UPDATE_FORCE:
return true;
}
return false;
}
static int vnc_update_client(VncState *vs, int has_dirty)
{
VncDisplay *vd = vs->vd;
@ -975,13 +994,7 @@ static int vnc_update_client(VncState *vs, int has_dirty)
}
vs->has_dirty += has_dirty;
if (vs->update == VNC_STATE_UPDATE_NONE) {
return 0;
}
if (vs->output.offset && !vs->audio_cap &&
vs->update != VNC_STATE_UPDATE_FORCE) {
/* kernel send buffers are full -> drop frames to throttle */
if (!vnc_should_update(vs)) {
return 0;
}