commit 478ae5eb5a0047e1b2988c896cff6363b455ee50
author Mathias Agopian <mathias@google.com> Tue Dec 06 17:22:19 2011 -0800
committer Mathias Agopian <mathias@google.com> Tue Dec 06 22:43:10 2011 -0800
tree bb3e26939a6b6a0c0b0b5ab4b12fe4f0dc5d7bf3
parent 9bbbcf8c65771e581a8bdbe5d1cc70e3faf310ab

Improve the VSYNC api a bit.

- add the ability to set the vsync delivery rate, when the rate is
set to N>1 (ie: receive every N vsync), SF process' is woken up for
all of vsync, but clients only see the every N events.

- add the concept of one-shot vsync events, with a call-back
to request the next one. currently the call-back is a binder IPC.

Change-Id: I09f71df0b0ba0d88ed997645e2e2497d553c9a1b

services/surfaceflinger/DisplayEventConnection.cpp

diff --git a/services/surfaceflinger/DisplayEventConnection.cpp b/services/surfaceflinger/DisplayEventConnection.cpp
index a0aa9c0..77ecbd2 100644
--- a/services/surfaceflinger/DisplayEventConnection.cpp
+++ b/services/surfaceflinger/DisplayEventConnection.cpp
@@ -25,6 +25,7 @@
 
 #include "SurfaceFlinger.h"
 #include "DisplayEventConnection.h"
+#include "EventThread.h"
 
 // ---------------------------------------------------------------------------
 
@@ -33,30 +34,38 @@
 // ---------------------------------------------------------------------------
 
 DisplayEventConnection::DisplayEventConnection(
-        const sp<SurfaceFlinger>& flinger)
-    : mFlinger(flinger), mChannel(new BitTube())
+        const sp<EventThread>& eventThread)
+    : mEventThread(eventThread), mChannel(new BitTube())
 {
 }
 
 DisplayEventConnection::~DisplayEventConnection() {
-    mFlinger->cleanupDisplayEventConnection(this);
+    mEventThread->unregisterDisplayEventConnection(this);
 }
 
 void DisplayEventConnection::onFirstRef() {
-    // nothing to do here for now.
+    // NOTE: mEventThread doesn't hold a strong reference on us
+    mEventThread->registerDisplayEventConnection(this);
 }
 
 sp<BitTube> DisplayEventConnection::getDataChannel() const {
     return mChannel;
 }
 
+void DisplayEventConnection::setVsyncRate(uint32_t count) {
+    mEventThread->setVsyncRate(count, this);
+}
+
+void DisplayEventConnection::requestNextVsync() {
+    mEventThread->requestNextVsync(this);
+}
+
 status_t DisplayEventConnection::postEvent(const DisplayEventReceiver::Event& event)
 {
     ssize_t size = mChannel->write(&event, sizeof(DisplayEventReceiver::Event));
     return size < 0 ? status_t(size) : status_t(NO_ERROR);
 }
 
-
 // ---------------------------------------------------------------------------
 
 }; // namespace android