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135 changes: 135 additions & 0 deletions
135
...ntation/src/main/java/com/myscript/iink/uireferenceimplementation/FrameTimeEstimator.java
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| /* | ||
| * Copyright 2023 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. | ||
| */ | ||
|
|
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| // Adapted from: | ||
| // https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:input/input-motionprediction/ | ||
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| package com.myscript.iink.uireferenceimplementation; | ||
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| import android.content.Context; | ||
| import android.os.Build; | ||
| import android.view.Display; | ||
| import android.view.WindowManager; | ||
|
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| import androidx.annotation.DoNotInline; | ||
| import androidx.annotation.NonNull; | ||
| import androidx.annotation.RequiresApi; | ||
|
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| /** | ||
| * Get screen fastest refresh rate (in ms) | ||
| */ | ||
| @SuppressWarnings("deprecation") | ||
| public class FrameTimeEstimator { | ||
| private static final float LEGACY_FRAME_TIME_MS = 16f; | ||
| private static final float MS_IN_A_SECOND = 1000f; | ||
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| static public float getFrameTime(@NonNull Context context) | ||
| { | ||
| return getFastestFrameTimeMs(context); | ||
| } | ||
|
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| private static Display getDisplayForContext(Context context) | ||
| { | ||
| if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) | ||
| { | ||
| return Api30Impl.getDisplayForContext(context); | ||
| } | ||
| return ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay(); | ||
| } | ||
|
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| private static float getFastestFrameTimeMs(Context context) | ||
| { | ||
| Display defaultDisplay = getDisplayForContext(context); | ||
|
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| if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) | ||
| { | ||
| return Api23Impl.getFastestFrameTimeMs(defaultDisplay); | ||
| } | ||
| else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) | ||
| { | ||
| return Api21Impl.getFastestFrameTimeMs(defaultDisplay); | ||
| } | ||
| else | ||
| { | ||
| return LEGACY_FRAME_TIME_MS; | ||
| } | ||
| } | ||
|
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| @SuppressWarnings("deprecation") | ||
| @RequiresApi(Build.VERSION_CODES.LOLLIPOP) | ||
| static class Api21Impl | ||
| { | ||
| private Api21Impl() | ||
| { | ||
| // Not instantiable | ||
| } | ||
|
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| @DoNotInline | ||
| static float getFastestFrameTimeMs(Display display) | ||
| { | ||
| float[] refreshRates = display.getSupportedRefreshRates(); | ||
| float largestRefreshRate = refreshRates[0]; | ||
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| for (int c = 1; c < refreshRates.length; c++) | ||
| { | ||
| if (refreshRates[c] > largestRefreshRate) | ||
| largestRefreshRate = refreshRates[c]; | ||
| } | ||
|
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| return MS_IN_A_SECOND / largestRefreshRate; | ||
| } | ||
| } | ||
|
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| @RequiresApi(Build.VERSION_CODES.M) | ||
| static class Api23Impl | ||
| { | ||
| private Api23Impl() | ||
| { | ||
| // Not instantiable | ||
| } | ||
|
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| @DoNotInline | ||
| static float getFastestFrameTimeMs(Display display) | ||
| { | ||
| Display.Mode[] displayModes = display.getSupportedModes(); | ||
| float largestRefreshRate = displayModes[0].getRefreshRate(); | ||
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| for (int c = 1; c < displayModes.length; c++) | ||
| { | ||
| float currentRefreshRate = displayModes[c].getRefreshRate(); | ||
| if (currentRefreshRate > largestRefreshRate) | ||
| largestRefreshRate = currentRefreshRate; | ||
| } | ||
|
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| return MS_IN_A_SECOND / largestRefreshRate; | ||
| } | ||
| } | ||
|
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| @RequiresApi(Build.VERSION_CODES.R) | ||
| static class Api30Impl | ||
| { | ||
| private Api30Impl() | ||
| { | ||
| // Not instantiable | ||
| } | ||
|
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| @DoNotInline | ||
| static Display getDisplayForContext(Context context) | ||
| { | ||
| return context.getDisplay(); | ||
| } | ||
| } | ||
| } |
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