From 0bad834228b9ee63e4239108d02dcb94568254d0 Mon Sep 17 00:00:00 2001 From: "Daniel P. Berrange" Date: Mon, 18 Dec 2017 19:12:23 +0000 Subject: ui: refactor code for determining if an update should be sent to the client MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Darren Kenny Reviewed-by: Marc-André Lureau Message-id: 20171218191228.31018-9-berrange@redhat.com Signed-off-by: Gerd Hoffmann --- ui/vnc.c | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) (limited to 'ui/vnc.c') diff --git a/ui/vnc.c b/ui/vnc.c index 243c72be13..4ba7fc076a 100644 --- a/ui/vnc.c +++ b/ui/vnc.c @@ -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; } -- cgit v1.2.3