[Xen-changelog] [qemu-xen master] ui: introduce enum to track VNC client framebuffer update request state

[patchbot@xxxxxxx]

commit 126617e6f8d395aa6d432527c28ff98cdf50a4c0
Author:     Daniel P. Berrange <berrange@xxxxxxxxxx>
AuthorDate: Mon Dec 18 19:12:21 2017 +0000
Commit:     Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon Feb 12 18:33:55 2018 -0600

    ui: introduce enum to track VNC client framebuffer update request state
    
    Currently the VNC servers tracks whether a client has requested an 
incremental
    or forced update with two boolean flags. There are only really 3 distinct
    states to track, so create an enum to more accurately reflect permitted 
states.
    
    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: 20171218191228.31018-7-berrange@xxxxxxxxxx
    Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
    (cherry picked from commit fef1bbadfb2c3027208eb3d14b43e1bdb51166ca)
    Signed-off-by: Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
---
 ui/vnc.c | 21 +++++++++++----------
 ui/vnc.h |  9 +++++++--
 2 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/ui/vnc.c b/ui/vnc.c
index f53eddb..d3b04f1 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -975,16 +975,17 @@ static int vnc_update_client(VncState *vs, int has_dirty)
     }
 
     vs->has_dirty += has_dirty;
-    if (!vs->need_update) {
+    if (vs->update == VNC_STATE_UPDATE_NONE) {
         return 0;
     }
 
-    if (vs->output.offset && !vs->audio_cap && !vs->force_update) {
+    if (vs->output.offset && !vs->audio_cap &&
+        vs->update != VNC_STATE_UPDATE_FORCE) {
         /* kernel send buffers are full -> drop frames to throttle */
         return 0;
     }
 
-    if (!vs->has_dirty && !vs->force_update) {
+    if (!vs->has_dirty && vs->update != VNC_STATE_UPDATE_FORCE) {
         return 0;
     }
 
@@ -1030,7 +1031,7 @@ static int vnc_update_client(VncState *vs, int has_dirty)
     }
 
     vnc_job_push(job);
-    vs->force_update = 0;
+    vs->update = VNC_STATE_UPDATE_INCREMENTAL;
     vs->has_dirty = 0;
     return n;
 }
@@ -1869,14 +1870,14 @@ static void ext_key_event(VncState *vs, int down,
 static void framebuffer_update_request(VncState *vs, int incremental,
                                        int x, int y, int w, int h)
 {
-    vs->need_update = 1;
-
     if (incremental) {
-        return;
+        if (vs->update != VNC_STATE_UPDATE_FORCE) {
+            vs->update = VNC_STATE_UPDATE_INCREMENTAL;
+        }
+    } else {
+        vs->update = VNC_STATE_UPDATE_FORCE;
+        vnc_set_area_dirty(vs->dirty, vs->vd, x, y, w, h);
     }
-
-    vs->force_update = 1;
-    vnc_set_area_dirty(vs->dirty, vs->vd, x, y, w, h);
 }
 
 static void send_ext_key_event_ack(VncState *vs)
diff --git a/ui/vnc.h b/ui/vnc.h
index 694cf32..b9d310e 100644
--- a/ui/vnc.h
+++ b/ui/vnc.h
@@ -252,6 +252,12 @@ struct VncJob
     QTAILQ_ENTRY(VncJob) next;
 };
 
+typedef enum {
+    VNC_STATE_UPDATE_NONE,
+    VNC_STATE_UPDATE_INCREMENTAL,
+    VNC_STATE_UPDATE_FORCE,
+} VncStateUpdate;
+
 struct VncState
 {
     QIOChannelSocket *sioc; /* The underlying socket */
@@ -264,8 +270,7 @@ struct VncState
                            * vnc-jobs-async.c */
 
     VncDisplay *vd;
-    int need_update;
-    int force_update;
+    VncStateUpdate update; /* Most recent pending request from client */
     int has_dirty;
     uint32_t features;
     int absolute;
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#master

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