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Refactor DisplayEventReceiver read loop.

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Change-Id: I98ef802ec0ca48f768e3b0920e1b4b4f7f141050
This commit is contained in:
Jeff Brown
2012-03-29 12:42:31 -07:00
parent ebb2d8d708
commit bec0a8682c
1 changed files with 29 additions and 28 deletions
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57
core/jni/android_view_DisplayEventReceiver.cpp
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@@ -49,7 +49,6 @@ public:
status_t initialize();
status_t scheduleVsync();
static int handleReceiveCallback(int receiveFd, int events, void* data);
protected:
virtual ~NativeDisplayEventReceiver();
@@ -59,6 +58,9 @@ private:
sp<Looper> mLooper;
DisplayEventReceiver mReceiver;
bool mWaitingForVsync;
static int handleReceiveCallback(int receiveFd, int events, void* data);
bool readLastVsyncMessage(nsecs_t* outTimestamp, uint32_t* outCount);
};
@@ -100,16 +102,9 @@ status_t NativeDisplayEventReceiver::scheduleVsync() {
ALOGV("receiver %p ~ Scheduling vsync.", this);
// Drain all pending events.
DisplayEventReceiver::Event buf[EVENT_BUFFER_SIZE];
ssize_t n;
while ((n = mReceiver.getEvents(buf, EVENT_BUFFER_SIZE)) > 0) {
ALOGV("receiver %p ~ Drained %d events.", this, int(n));
}
if (n < 0) {
ALOGW("Failed to drain events from display event receiver, status=%d", status_t(n));
return status_t(n);
}
nsecs_t vsyncTimestamp;
uint32_t vsyncCount;
readLastVsyncMessage(&vsyncTimestamp, &vsyncCount);
status_t status = mReceiver.requestNextVsync();
if (status) {
@@ -138,23 +133,9 @@ int NativeDisplayEventReceiver::handleReceiveCallback(int receiveFd, int events,
}
// Drain all pending events, keep the last vsync.
nsecs_t vsyncTimestamp = -1;
uint32_t vsyncCount = 0;
DisplayEventReceiver::Event buf[EVENT_BUFFER_SIZE];
ssize_t n;
while ((n = r->mReceiver.getEvents(buf, EVENT_BUFFER_SIZE)) > 0) {
ALOGV("receiver %p ~ Read %d events.", data, int(n));
while (n-- > 0) {
if (buf[n].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
vsyncTimestamp = buf[n].header.timestamp;
vsyncCount = buf[n].vsync.count;
break; // stop at last vsync in the buffer
}
}
}
if (vsyncTimestamp < 0) {
nsecs_t vsyncTimestamp;
uint32_t vsyncCount;
if (!r->readLastVsyncMessage(&vsyncTimestamp, &vsyncCount)) {
ALOGV("receiver %p ~ Woke up but there was no vsync pulse!", data);
return 1; // keep the callback, did not obtain a vsync pulse
}
@@ -179,6 +160,26 @@ int NativeDisplayEventReceiver::handleReceiveCallback(int receiveFd, int events,
return 1; // keep the callback
}
bool NativeDisplayEventReceiver::readLastVsyncMessage(
nsecs_t* outTimestamp, uint32_t* outCount) {
DisplayEventReceiver::Event buf[EVENT_BUFFER_SIZE];
ssize_t n;
while ((n = mReceiver.getEvents(buf, EVENT_BUFFER_SIZE)) > 0) {
ALOGV("receiver %p ~ Read %d events.", this, int(n));
while (n-- > 0) {
if (buf[n].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
*outTimestamp = buf[n].header.timestamp;
*outCount = buf[n].vsync.count;
return true; // stop at last vsync in the buffer
}
}
}
if (n < 0) {
ALOGW("Failed to get events from display event receiver, status=%d", status_t(n));
}
return false;
}
static jint nativeInit(JNIEnv* env, jclass clazz, jobject receiverObj,
jobject messageQueueObj) {