Add ChromeOS palm rejection model

This model will be used to block palm presses. It takes in a stream of
evdev events, and reports back the pointers which should be considered
palm.

Bug: 198472780
Test: atest libpalmrejection_test inputflinger_tests
Test: "adb shell device_config put input_native_boot
palm_rejection_enabled 0" and make sure that "adb shell dumpsys input"
shows that there aren't any palm rejectors inside
UnwantedInteractionBlocker

Change-Id: If979d335af29cf5e93b26336fea56a3a895cc562

1 files changed, 11 insertions, 1 deletions

diff --git a/services/inputflinger/InputManager.cpp b/services/inputflinger/InputManager.cpp
index 221e193136..7a9862d065 100644
--- a/services/inputflinger/InputManager.cpp
+++ b/services/inputflinger/InputManager.cpp
@@ -21,6 +21,7 @@
 #include "InputManager.h"
 #include "InputDispatcherFactory.h"
 #include "InputReaderFactory.h"
+#include "UnwantedInteractionBlocker.h"
 
 #include <binder/IPCThreadState.h>
 
@@ -54,12 +55,17 @@ static int32_t exceptionCodeFromStatusT(status_t status) {
     }
 }
 
+/**
+ * The event flow is via the "InputListener" interface, as follows:
+ * InputReader -> UnwantedInteractionBlocker -> InputClassifier -> InputDispatcher
+ */
 InputManager::InputManager(
         const sp<InputReaderPolicyInterface>& readerPolicy,
         const sp<InputDispatcherPolicyInterface>& dispatcherPolicy) {
     mDispatcher = createInputDispatcher(dispatcherPolicy);
     mClassifier = std::make_unique<InputClassifier>(*mDispatcher);
-    mReader = createInputReader(readerPolicy, *mClassifier);
+    mUnwantedInteractionBlocker = std::make_unique<UnwantedInteractionBlocker>(*mClassifier);
+    mReader = createInputReader(readerPolicy, *mUnwantedInteractionBlocker);
 }
 
 InputManager::~InputManager() {
@@ -106,6 +112,10 @@ InputReaderInterface& InputManager::getReader() {
     return *mReader;
 }
 
+UnwantedInteractionBlockerInterface& InputManager::getUnwantedInteractionBlocker() {
+    return *mUnwantedInteractionBlocker;
+}
+
 InputClassifierInterface& InputManager::getClassifier() {
     return *mClassifier;
 }