[Xen-changelog] [qemu-xen master] ui: refactor code for determining if an update should be sent to the client

[patchbot@xxxxxxx]

commit 5af9f2504fa2bc393b5b2d49ff1a85e5e11016bc
Author:     Daniel P. Berrange <berrange@xxxxxxxxxx>
AuthorDate: Mon Dec 18 19:12:23 2017 +0000
Commit:     Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon Feb 12 18:34:09 2018 -0600

    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@xxxxxxxxxx>
    Reviewed-by: Darren Kenny <darren.kenny@xxxxxxxxxx>
    Reviewed-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
    Message-id: 20171218191228.31018-9-berrange@xxxxxxxxxx
    Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
    (cherry picked from commit 0bad834228b9ee63e4239108d02dcb94568254d0)
    Signed-off-by: Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
---
 ui/vnc.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/ui/vnc.c b/ui/vnc.c
index 51fbf04..6ae002c 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;
     }
 
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#master

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