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From 3b0e5204ae4a681ed9f6bedd3cd18ecad877546c Mon Sep 17 00:00:00 2001
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From: "Daniel P. Berrange" <berrange@redhat.com>
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Date: Thu, 8 Feb 2018 17:50:35 +0100
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Subject: [PATCH 21/27] ui: refactor code for determining if an update should
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be sent to the client
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Daniel P. Berrange <berrange@redhat.com>
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Message-id: <20180208175041.5634-22-berrange@redhat.com>
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Patchwork-id: 78954
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O-Subject: [RHEL-7.5 qemu-kvm PATCH v1 21/27] ui: refactor code for determining if an update should be sent to the client
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Bugzilla: 1527405
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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From: "Daniel P. Berrange" <berrange@redhat.com>
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The logic for determining if it is possible to send an update to the client
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will become more complicated shortly, so pull it out into a separate method
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for easier extension later.
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Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
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Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-id: 20171218191228.31018-9-berrange@redhat.com
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit 0bad834228b9ee63e4239108d02dcb94568254d0)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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ui/vnc.c | 27 ++++++++++++++++++++-------
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1 file changed, 20 insertions(+), 7 deletions(-)
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diff --git a/ui/vnc.c b/ui/vnc.c
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index 075def1..a7ec8cc 100644
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--- a/ui/vnc.c
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+++ b/ui/vnc.c
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@@ -846,6 +846,25 @@ static int find_and_clear_dirty_height(struct VncState *vs,
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return h;
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}
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+static bool vnc_should_update(VncState *vs)
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+{
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+ switch (vs->update) {
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+ case VNC_STATE_UPDATE_NONE:
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+ break;
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+ case VNC_STATE_UPDATE_INCREMENTAL:
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+ /* Only allow incremental updates if the output buffer
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+ * is empty, or if audio capture is enabled.
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+ */
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+ if (!vs->output.offset || vs->audio_cap) {
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+ return true;
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+ }
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+ break;
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+ case VNC_STATE_UPDATE_FORCE:
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+ return true;
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+ }
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+ return false;
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+}
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+
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static int vnc_update_client(VncState *vs, int has_dirty)
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{
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VncDisplay *vd = vs->vd;
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@@ -860,13 +879,7 @@ static int vnc_update_client(VncState *vs, int has_dirty)
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}
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vs->has_dirty += has_dirty;
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- if (vs->update == VNC_STATE_UPDATE_NONE) {
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- return 0;
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- }
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-
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- if (vs->output.offset && !vs->audio_cap &&
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- vs->update != VNC_STATE_UPDATE_FORCE) {
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- /* kernel send buffers are full -> drop frames to throttle */
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+ if (!vnc_should_update(vs)) {
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return 0;
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}
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--
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1.8.3.1
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