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Dispatch multiple touch events in parallel.

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This change enables the input dispatcher to send multiple touch
events to an application without waiting for them to be acknowledged.
Essentially this is a variation on the old streaming optimization
but it is much more comprehensive.  Event dispatch will stall as
soon as 0.5sec of unacknowledged events are accumulated or a
focused event (such as a key event) needs to be delivered.

Streaming input events makes a tremendous difference in application
performance.  The next step will be to enable batching of input
events on the client side once again.

This is part of a series of changes to improve input system pipelining.

Bug: 5963420
Change-Id: I025df90c06165d719fcca7f63eed322a5cce4a78
This commit is contained in:
Jeff Brown 2012-02-06 19:12:47 -08:00
parent 6cdee9831d
commit cd50850d48
1 changed files with 13 additions and 0 deletions
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13
libs/ui/InputTransport.cpp
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@ -28,6 +28,13 @@
namespace android {
// Socket buffer size. The default is typically about 128KB, which is much larger than
// we really need. So we make it smaller. It just needs to be big enough to hold
// a few dozen large multi-finger motion events in the case where an application gets
// behind processing touches.
static const size_t SOCKET_BUFFER_SIZE = 32 * 1024;
// --- InputMessage ---
bool InputMessage::isValid(size_t actualSize) const {
@ -93,6 +100,12 @@ status_t InputChannel::openInputChannelPair(const String8& name,
return result;
}
int bufferSize = SOCKET_BUFFER_SIZE;
setsockopt(sockets[0], SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize));
setsockopt(sockets[0], SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize));
setsockopt(sockets[1], SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize));
setsockopt(sockets[1], SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize));
String8 serverChannelName = name;
serverChannelName.append(" (server)");
outServerChannel = new InputChannel(serverChannelName, sockets[0]);