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 package com.android.internal.accessibility.common;
18 
19 import android.os.SystemProperties;
20 
21 /**
22  * Collection of common constants for accessibility magnification.
23  */
24 public final class MagnificationConstants {
MagnificationConstants()25     private MagnificationConstants() {}
26 
27     /**
28      * The min value for the magnification persisted scale. We assume if the scale is lower than
29      * the min value, there will be no obvious magnification effect.
30      */
31     public static final float PERSISTED_SCALE_MIN_VALUE = 1.3f;
32 
33     /** Minimum supported value for magnification scale. */
34     public static final float SCALE_MIN_VALUE = 1.0f;
35 
36     /** Maximum supported value for magnification scale. Default of 8.0. */
37     public static final float SCALE_MAX_VALUE =
38             Float.parseFloat(SystemProperties.get("ro.config.max_magnification_scale", "8.0"));
39 }
40