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avoid turning vsync off/on at each frame 

always keep vsync active for an extra frame before
deciding if it should be turned off.

Change-Id: I55b03265b7851b33a595e46a013f2ab55e66c964
This commit is contained in:
Mathias Agopian 2012-04-08 15:01:31 -07:00
parent c522a6a5bf
commit d94d3b890a
1 changed files with 24 additions and 10 deletions
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34
services/surfaceflinger/EventThread.cpp
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@ -123,13 +123,9 @@ bool EventThread::threadLoop() {
Mutex::Autolock _l(mLock);
do {
// check if we have received a VSYNC event
if (mVSyncTimestamp) {
// we have a VSYNC event pending
timestamp = mVSyncTimestamp;
mVSyncTimestamp = 0;
break;
}
// latch VSYNC event if any
timestamp = mVSyncTimestamp;
mVSyncTimestamp = 0;
// check if we should be waiting for VSYNC events
bool waitForNextVsync = false;
@ -144,9 +140,27 @@ bool EventThread::threadLoop() {
}
}
// enable or disable VSYNC events
mHw.getHwComposer().eventControl(
HWComposer::EVENT_VSYNC, waitForNextVsync);
if (timestamp) {
if (!waitForNextVsync) {
// we received a VSYNC but we have no clients
// don't report it, and disable VSYNC events
mHw.getHwComposer().eventControl(
HWComposer::EVENT_VSYNC, false);
} else {
// report VSYNC event
break;
}
} else {
// never disable VSYNC events immediately, instead
// we'll wait to receive the event and we'll
// reevaluate whether we need to dispatch it and/or
// disable VSYNC events then.
if (waitForNextVsync) {
// enable
mHw.getHwComposer().eventControl(
HWComposer::EVENT_VSYNC, true);
}
}
// wait for something to happen
mCondition.wait(mLock);