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, 238 insertions, 0 deletions

diff --git a/libs/ui/Input.cpp b/libs/ui/Input.cpp
new file mode 100644
index 0000000..d367708
--- /dev/null
+++ b/libs/ui/Input.cpp
@@ -0,0 +1,238 @@
+//
+// Copyright 2010 The Android Open Source Project
+//
+// Provides a pipe-based transport for native events in the NDK.
+//
+#define LOG_TAG "Input"
+
+//#define LOG_NDEBUG 0
+
+#include <ui/Input.h>
+
+namespace android {
+
+// class InputEvent
+
+void InputEvent::initialize(int32_t deviceId, int32_t nature) {
+    mDeviceId = deviceId;
+    mNature = nature;
+}
+
+// class KeyEvent
+
+void KeyEvent::initialize(
+        int32_t deviceId,
+        int32_t nature,
+        int32_t action,
+        int32_t flags,
+        int32_t keyCode,
+        int32_t scanCode,
+        int32_t metaState,
+        int32_t repeatCount,
+        nsecs_t downTime,
+        nsecs_t eventTime) {
+    InputEvent::initialize(deviceId, nature);
+    mAction = action;
+    mFlags = flags;
+    mKeyCode = keyCode;
+    mScanCode = scanCode;
+    mMetaState = metaState;
+    mRepeatCount = repeatCount;
+    mDownTime = downTime;
+    mEventTime = eventTime;
+}
+
+// class MotionEvent
+
+void MotionEvent::initialize(
+        int32_t deviceId,
+        int32_t nature,
+        int32_t action,
+        int32_t edgeFlags,
+        int32_t metaState,
+        float rawX,
+        float rawY,
+        float xPrecision,
+        float yPrecision,
+        nsecs_t downTime,
+        nsecs_t eventTime,
+        size_t pointerCount,
+        const int32_t* pointerIds,
+        const PointerCoords* pointerCoords) {
+    InputEvent::initialize(deviceId, nature);
+    mAction = action;
+    mEdgeFlags = edgeFlags;
+    mMetaState = metaState;
+    mRawX = rawX;
+    mRawY = rawY;
+    mXPrecision = xPrecision;
+    mYPrecision = yPrecision;
+    mDownTime = downTime;
+    mPointerIds.clear();
+    mPointerIds.appendArray(pointerIds, pointerCount);
+    mSampleEventTimes.clear();
+    mSamplePointerCoords.clear();
+    addSample(eventTime, pointerCoords);
+}
+
+void MotionEvent::addSample(
+        int64_t eventTime,
+        const PointerCoords* pointerCoords) {
+    mSampleEventTimes.push(eventTime);
+    mSamplePointerCoords.appendArray(pointerCoords, getPointerCount());
+}
+
+void MotionEvent::offsetLocation(float xOffset, float yOffset) {
+    if (xOffset != 0 || yOffset != 0) {
+        for (size_t i = 0; i < mSamplePointerCoords.size(); i++) {
+            PointerCoords& pointerCoords = mSamplePointerCoords.editItemAt(i);
+            pointerCoords.x += xOffset;
+            pointerCoords.y += yOffset;
+        }
+    }
+}
+
+} // namespace android
+
+// NDK APIs
+
+using android::InputEvent;
+using android::KeyEvent;
+using android::MotionEvent;
+
+int32_t input_event_get_type(const input_event_t* event) {
+    return reinterpret_cast<const InputEvent*>(event)->getType();
+}
+
+int32_t input_event_get_device_id(const input_event_t* event) {
+    return reinterpret_cast<const InputEvent*>(event)->getDeviceId();
+}
+
+int32_t input_event_get_nature(const input_event_t* event) {
+    return reinterpret_cast<const InputEvent*>(event)->getNature();
+}
+
+int32_t key_event_get_action(const input_event_t* key_event) {
+    return reinterpret_cast<const KeyEvent*>(key_event)->getAction();
+}
+
+int32_t key_event_get_flags(const input_event_t* key_event) {
+    return reinterpret_cast<const KeyEvent*>(key_event)->getFlags();
+}
+
+int32_t key_event_get_key_code(const input_event_t* key_event) {
+    return reinterpret_cast<const KeyEvent*>(key_event)->getKeyCode();
+}
+
+int32_t key_event_get_scan_code(const input_event_t* key_event) {
+    return reinterpret_cast<const KeyEvent*>(key_event)->getScanCode();
+}
+
+int32_t key_event_get_meta_state(const input_event_t* key_event) {
+    return reinterpret_cast<const KeyEvent*>(key_event)->getMetaState();
+}
+int32_t key_event_get_repeat_count(const input_event_t* key_event) {
+    return reinterpret_cast<const KeyEvent*>(key_event)->getRepeatCount();
+}
+
+int64_t key_event_get_down_time(const input_event_t* key_event) {
+    return reinterpret_cast<const KeyEvent*>(key_event)->getDownTime();
+}
+
+int64_t key_event_get_event_time(const input_event_t* key_event) {
+    return reinterpret_cast<const KeyEvent*>(key_event)->getEventTime();
+}
+
+int32_t motion_event_get_action(const input_event_t* motion_event) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getAction();
+}
+
+int32_t motion_event_get_meta_state(const input_event_t* motion_event) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getMetaState();
+}
+
+int32_t motion_event_get_edge_flags(const input_event_t* motion_event) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getEdgeFlags();
+}
+
+int64_t motion_event_get_down_time(const input_event_t* motion_event) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getDownTime();
+}
+
+int64_t motion_event_get_event_time(const input_event_t* motion_event) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getEventTime();
+}
+
+float motion_event_get_x_precision(const input_event_t* motion_event) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getXPrecision();
+}
+
+float motion_event_get_y_precision(const input_event_t* motion_event) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getYPrecision();
+}
+
+size_t motion_event_get_pointer_count(const input_event_t* motion_event) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getPointerCount();
+}
+
+int32_t motion_event_get_pointer_id(const input_event_t* motion_event, size_t pointer_index) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getPointerId(pointer_index);
+}
+
+float motion_event_get_raw_x(const input_event_t* motion_event) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getRawX();
+}
+
+float motion_event_get_raw_y(const input_event_t* motion_event) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getRawY();
+}
+
+float motion_event_get_x(const input_event_t* motion_event, size_t pointer_index) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getX(pointer_index);
+}
+
+float motion_event_get_y(const input_event_t* motion_event, size_t pointer_index) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getY(pointer_index);
+}
+
+float motion_event_get_pressure(const input_event_t* motion_event, size_t pointer_index) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getPressure(pointer_index);
+}
+
+float motion_event_get_size(const input_event_t* motion_event, size_t pointer_index) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getSize(pointer_index);
+}
+
+size_t motion_event_get_history_size(const input_event_t* motion_event) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getHistorySize();
+}
+
+int64_t motion_event_get_historical_event_time(input_event_t* motion_event,
+        size_t history_index) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getHistoricalEventTime(
+            history_index);
+}
+
+float motion_event_get_historical_x(input_event_t* motion_event, size_t pointer_index,
+        size_t history_index) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getHistoricalX(
+            pointer_index, history_index);
+}
+
+float motion_event_get_historical_y(input_event_t* motion_event, size_t pointer_index,
+        size_t history_index) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getHistoricalY(
+            pointer_index, history_index);
+}
+
+float motion_event_get_historical_pressure(input_event_t* motion_event, size_t pointer_index,
+        size_t history_index) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getHistoricalPressure(
+            pointer_index, history_index);
+}
+
+float motion_event_get_historical_size(input_event_t* motion_event, size_t pointer_index,
+        size_t history_index) {
+    return reinterpret_cast<const MotionEvent*>(motion_event)->getHistoricalSize(
+            pointer_index, history_index);
+}