It sends a full update of the screen, in high quality JPEG format, after a
programmable idle time.
This is disabled by default.
---
common/rfb/ServerCore.cxx | 8 ++++++++
common/rfb/ServerCore.h | 3 ++-
common/rfb/VNCSConnectionST.cxx | 29 ++++++++++++++++++++++++++++-
common/rfb/VNCSConnectionST.h | 3 +++
4 files changed, 41 insertions(+), 2 deletions(-)
diff --git a/common/rfb/ServerCore.cxx b/common/rfb/ServerCore.cxx
index ae2fd24..583648e 100644
--- a/common/rfb/ServerCore.cxx
+++ b/common/rfb/ServerCore.cxx
@@ -93,4 +93,12 @@ rfb::BoolParameter rfb::Server::queryConnect
("QueryConnect",
"Prompt the local user to accept or reject incoming connections.",
false);
+rfb::BoolParameter rfb::Server::automaticLosslessRefresh
+("AutomaticLosslessRefresh",
+ "Automatically refresh the framebuffer with lossless compression.",
+ false);
+rfb::IntParameter rfb::Server::automaticLosslessRefreshDelay
+("AutomaticLosslessRefreshDelay",
+ "Delay (in milliseconds) of inactivity after which to refresh framebuffer.",
+ 3000);
diff --git a/common/rfb/ServerCore.h b/common/rfb/ServerCore.h
index e12a8bc..745cdb5 100644
--- a/common/rfb/ServerCore.h
+++ b/common/rfb/ServerCore.h
@@ -38,6 +38,7 @@ namespace rfb {
static IntParameter maxIdleTime;
static IntParameter clientWaitTimeMillis;
static IntParameter compareFB;
+ static IntParameter automaticLosslessRefreshDelay;
static BoolParameter protocol3_3;
static BoolParameter alwaysShared;
static BoolParameter neverShared;
@@ -47,7 +48,7 @@ namespace rfb {
static BoolParameter acceptCutText;
static BoolParameter sendCutText;
static BoolParameter queryConnect;
-
+ static BoolParameter automaticLosslessRefresh;
};
};
diff --git a/common/rfb/VNCSConnectionST.cxx b/common/rfb/VNCSConnectionST.cxx
index deec186..ec2e35e 100644
--- a/common/rfb/VNCSConnectionST.cxx
+++ b/common/rfb/VNCSConnectionST.cxx
@@ -74,7 +74,7 @@ VNCSConnectionST::VNCSConnectionST(VNCServerST* server_,
network::Socket *s,
drawRenderedCursor(false), removeRenderedCursor(false),
continuousUpdates(false),
updateTimer(this), pointerEventTime(0),
- accessRights(AccessDefault), startTime(time(0))
+ accessRights(AccessDefault), startTime(time(0)), alrTimer(this)
{
setStreams(&sock->inStream(), &sock->outStream());
peerEndpoint.buf = sock->getPeerEndpoint();
@@ -758,6 +758,10 @@ bool VNCSConnectionST::handleTimeout(Timer* t)
writeFramebufferUpdate();
else if (t == &congestionTimer)
updateCongestion();
+ else if (t == &alrTimer) {
+ fprintf(stderr, "Doing ALR\n");
+ automaticLosslessRefresh();
+ }
} catch (rdr::Exception& e) {
close(e.str());
}
@@ -971,6 +975,7 @@ void VNCSConnectionST::writeFramebufferUpdate()
// bit if things are congested.
if (isCongested()) {
updateTimer.start(50);
+ alrTimer.stop();
return;
}
@@ -1070,6 +1075,7 @@ void VNCSConnectionST::writeFramebufferUpdate()
}
if (!ui.is_empty() || writer()->needFakeUpdate() || drawRenderedCursor) {
+ alrTimer.stop();
// Compute the number of rectangles. Tight encoder makes the things more
// complicated as compared to the original VNC4.
writer()->setupCurrentEncoder();
@@ -1108,6 +1114,8 @@ void VNCSConnectionST::writeFramebufferUpdate()
requested.clear();
}
+ if (rfb::Server::automaticLosslessRefresh)
+ alrTimer.start(rfb::Server::automaticLosslessRefreshDelay);
out:
network::TcpSocket::cork(sock->getFd(), false);
}
@@ -1234,3 +1242,22 @@ int VNCSConnectionST::getStatus()
return 4;
}
+void VNCSConnectionST::automaticLosslessRefresh(void)
+{
+ // Automatic lossless refresh using JPEG Q95, 1X chroma sampling
+ int q = cp.qualityLevel, fq = cp.fineQualityLevel;
+ JPEG_SUBSAMP subsampling = cp.subsampling;
+ cp.qualityLevel = 9;
+ cp.fineQualityLevel = 95;
+ cp.subsampling = SUBSAMP_NONE;
+
+ // Update all the screen (TODO: be smarter)
+ framebufferUpdateRequest(Rect(0, 0, cp.width, cp.height), false);
+ writeFramebufferUpdate();
+ alrTimer.stop();
+
+ // Reset to previous compression settings
+ cp.qualityLevel = q;
+ cp.fineQualityLevel = fq;
+ cp.subsampling = subsampling;
+}
diff --git a/common/rfb/VNCSConnectionST.h b/common/rfb/VNCSConnectionST.h
index 72dc59c..9b6b112 100644
--- a/common/rfb/VNCSConnectionST.h
+++ b/common/rfb/VNCSConnectionST.h
@@ -178,6 +178,8 @@ namespace rfb {
void setDesktopName(const char *name);
void setSocketTimeouts();
+ void automaticLosslessRefresh(void);
+
network::Socket* sock;
CharArray peerEndpoint;
@@ -207,6 +209,7 @@ namespace rfb {
Region cuRegion;
Timer updateTimer;
+ Timer alrTimer;
std::set<rdr::U32> pressedKeys;
--
1.7.9.2
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