1 /*
2 * Copyright 2020 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 "DisplayManagerGlobal-JNI"
18
19 #include <nativehelper/JNIHelp.h>
20 #include <nativehelper/ScopedUtfChars.h>
21 #include <private/android/choreographer.h>
22
23 #include <vector>
24
25 #include "core_jni_helpers.h"
26
27 using namespace android;
28
29 namespace android {
30
31 // Dispatches the current refresh rate for the default display to all
32 // choreographer instances
android_hardware_display_DisplayManagerGlobal_signalNativeCallbacks(JNIEnv * env,jobject,jfloat refreshRate)33 void android_hardware_display_DisplayManagerGlobal_signalNativeCallbacks(JNIEnv* env, jobject,
34 jfloat refreshRate) {
35 const constexpr int64_t kNanosPerSecond = 1000 * 1000 * 1000;
36 const nsecs_t vsyncPeriod = kNanosPerSecond / refreshRate;
37
38 AChoreographer_signalRefreshRateCallbacks(vsyncPeriod);
39 }
40
41 } // namespace android
42
43 // ----------------------------------------------------------------------------
44
45 const char* const kClassPathName = "android/hardware/display/DisplayManagerGlobal";
46
47 static const JNINativeMethod gMethods[] = {
48 {"nSignalNativeCallbacks", "(F)V",
49 (void*)android_hardware_display_DisplayManagerGlobal_signalNativeCallbacks},
50 };
51
register_android_hardware_display_DisplayManagerGlobal(JNIEnv * env)52 int register_android_hardware_display_DisplayManagerGlobal(JNIEnv* env) {
53 AChoreographer_initJVM(env);
54 return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods));
55 }
56