Native input dispatch rewrite work in progress.

The old dispatch mechanism has been left in place and continues to
be used by default for now.  To enable native input dispatch,
edit the ENABLE_NATIVE_DISPATCH constant in WindowManagerPolicy.

Includes part of the new input event NDK API.  Some details TBD.

To wire up input dispatch, as the ViewRoot adds a window to the
window session it receives an InputChannel object as an output
argument.  The InputChannel encapsulates the file descriptors for a
shared memory region and two pipe end-points.  The ViewRoot then
provides the InputChannel to the InputQueue.  Behind the
scenes, InputQueue simply attaches handlers to the native PollLoop object
that underlies the MessageQueue.  This way MessageQueue doesn't need
to know anything about input dispatch per-se, it just exposes (in native
code) a PollLoop that other components can use to monitor file descriptor
state changes.

There can be zero or more targets for any given input event.  Each
input target is specified by its input channel and some parameters
including flags, an X/Y coordinate offset, and the dispatch timeout.
An input target can request either synchronous dispatch (for foreground apps)
or asynchronous dispatch (fire-and-forget for wallpapers and "outside"
targets).  Currently, finding the appropriate input targets for an event
requires a call back into the WindowManagerServer from native code.
In the future this will be refactored to avoid most of these callbacks
except as required to handle pending focus transitions.

End-to-end event dispatch mostly works!

To do: event injection, rate limiting, ANRs, testing, optimization, etc.

Change-Id: I8c36b2b9e0a2d27392040ecda0f51b636456de25

1 files changed, 114 insertions, 0 deletions

diff --git a/libs/ui/InputManager.cpp b/libs/ui/InputManager.cpp
new file mode 100644
index 0000000000..ab354a5da1
--- /dev/null
+++ b/libs/ui/InputManager.cpp
@@ -0,0 +1,114 @@
+//
+// Copyright 2010 The Android Open Source Project
+//
+// The input manager.
+//
+#define LOG_TAG "InputManager"
+
+//#define LOG_NDEBUG 0
+
+#include <cutils/log.h>
+#include <ui/InputManager.h>
+#include <ui/InputReader.h>
+#include <ui/InputDispatcher.h>
+
+namespace android {
+
+InputManager::InputManager(const sp<EventHubInterface>& eventHub,
+        const sp<InputDispatchPolicyInterface>& policy) :
+        mEventHub(eventHub), mPolicy(policy) {
+    mDispatcher = new InputDispatcher(policy);
+    mReader = new InputReader(eventHub, policy, mDispatcher);
+
+    mDispatcherThread = new InputDispatcherThread(mDispatcher);
+    mReaderThread = new InputReaderThread(mReader);
+
+    configureExcludedDevices();
+}
+
+InputManager::~InputManager() {
+    stop();
+}
+
+void InputManager::configureExcludedDevices() {
+    Vector<String8> excludedDeviceNames;
+    mPolicy->getExcludedDeviceNames(excludedDeviceNames);
+
+    for (size_t i = 0; i < excludedDeviceNames.size(); i++) {
+        mEventHub->addExcludedDevice(excludedDeviceNames[i]);
+    }
+}
+
+status_t InputManager::start() {
+    status_t result = mDispatcherThread->run("InputDispatcher", PRIORITY_URGENT_DISPLAY);
+    if (result) {
+        LOGE("Could not start InputDispatcher thread due to error %d.", result);
+        return result;
+    }
+
+    result = mReaderThread->run("InputReader", PRIORITY_URGENT_DISPLAY);
+    if (result) {
+        LOGE("Could not start InputReader thread due to error %d.", result);
+
+        mDispatcherThread->requestExit();
+        return result;
+    }
+
+    return OK;
+}
+
+status_t InputManager::stop() {
+    status_t result = mReaderThread->requestExitAndWait();
+    if (result) {
+        LOGW("Could not stop InputReader thread due to error %d.", result);
+    }
+
+    result = mDispatcherThread->requestExitAndWait();
+    if (result) {
+        LOGW("Could not stop InputDispatcher thread due to error %d.", result);
+    }
+
+    return OK;
+}
+
+status_t InputManager::registerInputChannel(const sp<InputChannel>& inputChannel) {
+    return mDispatcher->registerInputChannel(inputChannel);
+}
+
+status_t InputManager::unregisterInputChannel(const sp<InputChannel>& inputChannel) {
+    return mDispatcher->unregisterInputChannel(inputChannel);
+}
+
+int32_t InputManager::getScanCodeState(int32_t deviceId, int32_t deviceClasses, int32_t scanCode)
+    const {
+    int32_t vkKeyCode, vkScanCode;
+    if (mReader->getCurrentVirtualKey(& vkKeyCode, & vkScanCode)) {
+        if (vkScanCode == scanCode) {
+            return KEY_STATE_VIRTUAL;
+        }
+    }
+
+    return mEventHub->getScanCodeState(deviceId, deviceClasses, scanCode);
+}
+
+int32_t InputManager::getKeyCodeState(int32_t deviceId, int32_t deviceClasses, int32_t keyCode)
+    const {
+    int32_t vkKeyCode, vkScanCode;
+    if (mReader->getCurrentVirtualKey(& vkKeyCode, & vkScanCode)) {
+        if (vkKeyCode == keyCode) {
+            return KEY_STATE_VIRTUAL;
+        }
+    }
+
+    return mEventHub->getKeyCodeState(deviceId, deviceClasses, keyCode);
+}
+
+int32_t InputManager::getSwitchState(int32_t deviceId, int32_t deviceClasses, int32_t sw) const {
+    return mEventHub->getSwitchState(deviceId, deviceClasses, sw);
+}
+
+bool InputManager::hasKeys(size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags) const {
+    return mEventHub->hasKeys(numCodes, keyCodes, outFlags);
+}
+
+} // namespace android