1 /*
2 * Copyright (C) 2023 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "MotionPredictor-JNI"
18
19 #include <input/Input.h>
20 #include <input/MotionPredictor.h>
21
22 #include "android_view_MotionEvent.h"
23 #include "core_jni_helpers.h"
24
25 /**
26 * This file is a bridge from Java to native for MotionPredictor class.
27 * It should be pass-through only. Do not store any state or put any business logic into this file.
28 */
29
30 namespace android {
31
release(void * ptr)32 static void release(void* ptr) {
33 delete reinterpret_cast<MotionPredictor*>(ptr);
34 }
35
android_view_MotionPredictor_nativeGetNativeMotionPredictorFinalizer(JNIEnv * env,jclass clazz)36 static jlong android_view_MotionPredictor_nativeGetNativeMotionPredictorFinalizer(JNIEnv* env,
37 jclass clazz) {
38 return reinterpret_cast<jlong>(release);
39 }
40
android_view_MotionPredictor_nativeInitialize(JNIEnv * env,jclass clazz,jint offsetNanos)41 static jlong android_view_MotionPredictor_nativeInitialize(JNIEnv* env, jclass clazz,
42 jint offsetNanos) {
43 const nsecs_t offset = static_cast<nsecs_t>(offsetNanos);
44 return reinterpret_cast<jlong>(new MotionPredictor(offset));
45 }
46
android_view_MotionPredictor_nativeRecord(JNIEnv * env,jclass clazz,jlong ptr,jobject event)47 static void android_view_MotionPredictor_nativeRecord(JNIEnv* env, jclass clazz, jlong ptr,
48 jobject event) {
49 MotionPredictor* predictor = reinterpret_cast<MotionPredictor*>(ptr);
50 MotionEvent* motionEvent = android_view_MotionEvent_getNativePtr(env, event);
51
52 android::base::Result<void> result = predictor->record(*motionEvent);
53 if (!result.ok()) {
54 jniThrowException(env, "java/lang/IllegalArgumentException",
55 result.error().message().c_str());
56 }
57 }
58
android_view_MotionPredictor_nativePredict(JNIEnv * env,jclass clazz,jlong ptr,jlong predictionTimeNanos)59 static jobject android_view_MotionPredictor_nativePredict(JNIEnv* env, jclass clazz, jlong ptr,
60 jlong predictionTimeNanos) {
61 MotionPredictor* predictor = reinterpret_cast<MotionPredictor*>(ptr);
62 return android_view_MotionEvent_obtainFromNative(env,
63 predictor->predict(static_cast<nsecs_t>(
64 predictionTimeNanos)));
65 }
66
android_view_MotionPredictor_nativeIsPredictionAvailable(JNIEnv * env,jclass clazz,jlong ptr,jint deviceId,jint source)67 static jboolean android_view_MotionPredictor_nativeIsPredictionAvailable(JNIEnv* env, jclass clazz,
68 jlong ptr, jint deviceId,
69 jint source) {
70 MotionPredictor* predictor = reinterpret_cast<MotionPredictor*>(ptr);
71 return predictor->isPredictionAvailable(static_cast<int32_t>(deviceId),
72 static_cast<int32_t>(source));
73 }
74
75 // ----------------------------------------------------------------------------
76
77 static const std::array<JNINativeMethod, 5> gMotionPredictorMethods{{
78 /* name, signature, funcPtr */
79 {"nativeInitialize", "(I)J", (void*)android_view_MotionPredictor_nativeInitialize},
80 {"nativeGetNativeMotionPredictorFinalizer", "()J",
81 (void*)android_view_MotionPredictor_nativeGetNativeMotionPredictorFinalizer},
82 {"nativeRecord", "(JLandroid/view/MotionEvent;)V",
83 (void*)android_view_MotionPredictor_nativeRecord},
84 {"nativePredict", "(JJ)Landroid/view/MotionEvent;",
85 (void*)android_view_MotionPredictor_nativePredict},
86 {"nativeIsPredictionAvailable", "(JII)Z",
87 (void*)android_view_MotionPredictor_nativeIsPredictionAvailable},
88 }};
89
register_android_view_MotionPredictor(JNIEnv * env)90 int register_android_view_MotionPredictor(JNIEnv* env) {
91 return RegisterMethodsOrDie(env, "android/view/MotionPredictor", gMotionPredictorMethods.data(),
92 gMotionPredictorMethods.size());
93 }
94
95 } // namespace android
96