JNI wrapper for FpsListener. (644553d0) · Commits · e / os / android_frameworks_base

core/java/android/view/SurfaceControlFpsListener.java

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		/*
		* Copyright 2021 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.
		*/

		package android.view;

		import android.annotation.NonNull;

		/**
		* Listener for sampling the frames per second for a SurfaceControl and its children.
		* This should only be used by a system component that needs to listen to a SurfaceControl's
		* tree's FPS when it is not actively submitting transactions for that SurfaceControl.
		* Otherwise, ASurfaceTransaction_OnComplete callbacks should be used.
		*
		* @hide
		*/
		public abstract class SurfaceControlFpsListener {
		private long mNativeListener;

		public SurfaceControlFpsListener() {
		mNativeListener = nativeCreate(this);
		}

		protected void destroy() {
		if (mNativeListener == 0) {
		return;
		}
		unregister();
		nativeDestroy(mNativeListener);
		mNativeListener = 0;
		}

		@Override
		protected void finalize() throws Throwable {
		try {
		destroy();
		} finally {
		super.finalize();
		}
		}

		/**
		* Reports the fps from the registered SurfaceControl
		*/
		public abstract void onFpsReported(float fps);

		/**
		* Registers the sampling listener.
		*/
		public void register(@NonNull SurfaceControl layer) {
		if (mNativeListener == 0) {
		return;
		}

		nativeRegister(mNativeListener, layer.mNativeObject);
		}

		/**
		* Unregisters the sampling listener.
		*/
		public void unregister() {
		if (mNativeListener == 0) {
		return;
		}
		nativeUnregister(mNativeListener);
		}

		/**
		* Dispatch the collected sample.
		*
		* Called from native code on a binder thread.
		*/
		private static void dispatchOnFpsReported(SurfaceControlFpsListener listener, float fps) {
		listener.onFpsReported(fps);
		}

		private static native long nativeCreate(SurfaceControlFpsListener thiz);
		private static native void nativeDestroy(long ptr);
		private static native void nativeRegister(long ptr, long layerObject);
		private static native void nativeUnregister(long ptr);
		}

core/jni/Android.bp

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		@@ -102,6 +102,7 @@ cc_library_shared {
		"android_view_PointerIcon.cpp",
		"android_view_Surface.cpp",
		"android_view_SurfaceControl.cpp",
		"android_view_SurfaceControlFpsListener.cpp",
		"android_graphics_BLASTBufferQueue.cpp",
		"android_view_SurfaceSession.cpp",
		"android_view_TextureView.cpp",

core/jni/AndroidRuntime.cpp

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		@@ -119,6 +119,7 @@ extern int register_android_view_InputApplicationHandle(JNIEnv* env);
		extern int register_android_view_InputWindowHandle(JNIEnv* env);
		extern int register_android_view_Surface(JNIEnv* env);
		extern int register_android_view_SurfaceControl(JNIEnv* env);
		extern int register_android_view_SurfaceControlFpsListener(JNIEnv* env);
		extern int register_android_view_SurfaceSession(JNIEnv* env);
		extern int register_android_view_CompositionSamplingListener(JNIEnv* env);
		extern int register_android_view_TextureView(JNIEnv* env);
		@@ -1486,6 +1487,7 @@ static const RegJNIRec gRegJNI[] = {
		REG_JNI(register_android_view_InputWindowHandle),
		REG_JNI(register_android_view_Surface),
		REG_JNI(register_android_view_SurfaceControl),
		REG_JNI(register_android_view_SurfaceControlFpsListener),
		REG_JNI(register_android_view_SurfaceSession),
		REG_JNI(register_android_view_CompositionSamplingListener),
		REG_JNI(register_android_view_TextureView),

core/jni/android_view_SurfaceControlFpsListener.cpp

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		/*
		* Copyright 2021 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 "SurfaceControlFpsListener"

		#include <android/gui/BnFpsListener.h>
		#include <android_runtime/AndroidRuntime.h>
		#include <android_runtime/Log.h>
		#include <gui/ISurfaceComposer.h>
		#include <gui/SurfaceComposerClient.h>
		#include <nativehelper/JNIHelp.h>
		#include <utils/Log.h>
		#include <utils/RefBase.h>

		#include "android_util_Binder.h"
		#include "core_jni_helpers.h"

		namespace android {

		namespace {

		struct {
		jclass mClass;
		jmethodID mDispatchOnFpsReported;
		} gListenerClassInfo;

		struct SurfaceControlFpsListener : public gui::BnFpsListener {
		SurfaceControlFpsListener(JNIEnv* env, jobject listener)
		: mListener(env->NewWeakGlobalRef(listener)) {}

		binder::Status onFpsReported(float fps) override {
		JNIEnv* env = AndroidRuntime::getJNIEnv();
		LOG_ALWAYS_FATAL_IF(env == nullptr, "Unable to retrieve JNIEnv in onFpsReported.");

		jobject listener = env->NewGlobalRef(mListener);
		if (listener == NULL) {
		// Weak reference went out of scope
		return binder::Status::ok();
		}
		env->CallStaticVoidMethod(gListenerClassInfo.mClass,
		gListenerClassInfo.mDispatchOnFpsReported, listener,
		static_cast<jfloat>(fps));
		env->DeleteGlobalRef(listener);

		if (env->ExceptionCheck()) {
		ALOGE("SurfaceControlFpsListener.onFpsReported() failed.");
		LOGE_EX(env);
		env->ExceptionClear();
		}
		return binder::Status::ok();
		}

		protected:
		virtual ~SurfaceControlFpsListener() {
		JNIEnv* env = AndroidRuntime::getJNIEnv();
		env->DeleteWeakGlobalRef(mListener);
		}

		private:
		jweak mListener;
		};

		jlong nativeCreate(JNIEnv* env, jclass clazz, jobject obj) {
		SurfaceControlFpsListener* listener = new SurfaceControlFpsListener(env, obj);
		listener->incStrong((void*)nativeCreate);
		return reinterpret_cast<jlong>(listener);
		}

		void nativeDestroy(JNIEnv* env, jclass clazz, jlong ptr) {
		SurfaceControlFpsListener* listener = reinterpret_cast<SurfaceControlFpsListener*>(ptr);
		listener->decStrong((void*)nativeCreate);
		}

		void nativeRegister(JNIEnv* env, jclass clazz, jlong ptr, jlong layerObj) {
		sp<SurfaceControlFpsListener> listener = reinterpret_cast<SurfaceControlFpsListener*>(ptr);
		auto layer = reinterpret_cast<SurfaceControl*>(layerObj);
		sp<IBinder> layerHandle = layer != nullptr ? layer->getHandle() : nullptr;
		if (SurfaceComposerClient::addFpsListener(layerHandle, listener) != OK) {
		constexpr auto error_msg = "Couldn't addFpsListener";
		ALOGE(error_msg);
		jniThrowRuntimeException(env, error_msg);
		}
		}

		void nativeUnregister(JNIEnv* env, jclass clazz, jlong ptr) {
		sp<SurfaceControlFpsListener> listener = reinterpret_cast<SurfaceControlFpsListener*>(ptr);

		if (SurfaceComposerClient::removeFpsListener(listener) != OK) {
		constexpr auto error_msg = "Couldn't removeFpsListener";
		ALOGE(error_msg);
		jniThrowRuntimeException(env, error_msg);
		}
		}

		const JNINativeMethod gMethods[] = {
		/* name, signature, funcPtr */
		{"nativeCreate", "(Landroid/view/SurfaceControlFpsListener;)J", (void*)nativeCreate},
		{"nativeDestroy", "(J)V", (void*)nativeDestroy},
		{"nativeRegister", "(JJ)V", (void*)nativeRegister},
		{"nativeUnregister", "(J)V", (void*)nativeUnregister}};

		} // namespace

		int register_android_view_SurfaceControlFpsListener(JNIEnv* env) {
		int res = jniRegisterNativeMethods(env, "android/view/SurfaceControlFpsListener", gMethods,
		NELEM(gMethods));
		LOG_ALWAYS_FATAL_IF(res < 0, "Unable to register native methods.");

		jclass clazz = env->FindClass("android/view/SurfaceControlFpsListener");
		gListenerClassInfo.mClass = MakeGlobalRefOrDie(env, clazz);
		gListenerClassInfo.mDispatchOnFpsReported =
		env->GetStaticMethodID(clazz, "dispatchOnFpsReported",
		"(Landroid/view/SurfaceControlFpsListener;F)V");
		return 0;
		}

		} // namespace android

core/tests/coretests/src/android/view/SurfaceControlFpsListenerTest.java

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		/*
		* Copyright 2021 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.
		*/

		package android.view;

		import android.platform.test.annotations.Presubmit;

		import androidx.test.filters.SmallTest;
		import androidx.test.runner.AndroidJUnit4;

		import org.junit.Test;
		import org.junit.runner.RunWith;

		@RunWith(AndroidJUnit4.class)
		@SmallTest
		@Presubmit
		public class SurfaceControlFpsListenerTest {

		@Test
		public void registersAndUnregisters() {

		SurfaceControlFpsListener listener = new SurfaceControlFpsListener() {
		@Override
		public void onFpsReported(float fps) {
		// Ignore
		}
		};

		listener.register(new SurfaceControl());

		listener.unregister();
		}
		}