| /* |
| * Copyright 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "DisplayManagerGlobal-JNI" |
| |
| #include <nativehelper/JNIHelp.h> |
| #include <nativehelper/ScopedUtfChars.h> |
| #include <private/android/choreographer.h> |
| |
| #include <vector> |
| |
| #include "core_jni_helpers.h" |
| |
| using namespace android; |
| |
| namespace android { |
| |
| // Dispatches the current refresh rate for the default display to all |
| // choreographer instances |
| void android_hardware_display_DisplayManagerGlobal_signalNativeCallbacks(JNIEnv* env, jobject, |
| jfloat refreshRate) { |
| const constexpr int64_t kNanosPerSecond = 1000 * 1000 * 1000; |
| const nsecs_t vsyncPeriod = kNanosPerSecond / refreshRate; |
| |
| AChoreographer_signalRefreshRateCallbacks(vsyncPeriod); |
| } |
| |
| } // namespace android |
| |
| // ---------------------------------------------------------------------------- |
| |
| const char* const kClassPathName = "android/hardware/display/DisplayManagerGlobal"; |
| |
| static const JNINativeMethod gMethods[] = { |
| {"nSignalNativeCallbacks", "(F)V", |
| (void*)android_hardware_display_DisplayManagerGlobal_signalNativeCallbacks}, |
| }; |
| |
| int register_android_hardware_display_DisplayManagerGlobal(JNIEnv* env) { |
| AChoreographer_initJVM(env); |
| return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods)); |
| } |