1 /* 2 * Copyright (C) 2012 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 android.view; 18 19 import android.os.Parcel; 20 import android.os.Parcelable; 21 import android.util.Pools.SynchronizedPool; 22 23 /** 24 * This class represents spec for performing screen magnification. 25 * 26 * @hide 27 */ 28 public class MagnificationSpec implements Parcelable { 29 private static final int MAX_POOL_SIZE = 20; 30 private static final SynchronizedPool<MagnificationSpec> sPool = 31 new SynchronizedPool<>(MAX_POOL_SIZE); 32 33 /** The magnification scaling factor. */ 34 public float scale = 1.0f; 35 36 /** 37 * The X coordinate, in unscaled screen-relative pixels, around which 38 * magnification is focused. 39 */ 40 public float offsetX; 41 42 /** 43 * The Y coordinate, in unscaled screen-relative pixels, around which 44 * magnification is focused. 45 */ 46 public float offsetY; 47 MagnificationSpec()48 private MagnificationSpec() { 49 /* do nothing - reducing visibility */ 50 } 51 initialize(float scale, float offsetX, float offsetY)52 public void initialize(float scale, float offsetX, float offsetY) { 53 if (scale < 1) { 54 throw new IllegalArgumentException("Scale must be greater than or equal to one!"); 55 } 56 this.scale = scale; 57 this.offsetX = offsetX; 58 this.offsetY = offsetY; 59 } 60 isNop()61 public boolean isNop() { 62 return scale == 1.0f && offsetX == 0 && offsetY == 0; 63 } 64 obtain(MagnificationSpec other)65 public static MagnificationSpec obtain(MagnificationSpec other) { 66 MagnificationSpec info = obtain(); 67 info.scale = other.scale; 68 info.offsetX = other.offsetX; 69 info.offsetY = other.offsetY; 70 return info; 71 } 72 obtain()73 public static MagnificationSpec obtain() { 74 MagnificationSpec spec = sPool.acquire(); 75 return (spec != null) ? spec : new MagnificationSpec(); 76 } 77 recycle()78 public void recycle() { 79 clear(); 80 sPool.release(this); 81 } 82 clear()83 public void clear() { 84 scale = 1.0f; 85 offsetX = 0.0f; 86 offsetY = 0.0f; 87 } 88 setTo(MagnificationSpec other)89 public void setTo(MagnificationSpec other) { 90 scale = other.scale; 91 offsetX = other.offsetX; 92 offsetY = other.offsetY; 93 } 94 95 @Override describeContents()96 public int describeContents() { 97 return 0; 98 } 99 100 @Override writeToParcel(Parcel parcel, int flags)101 public void writeToParcel(Parcel parcel, int flags) { 102 parcel.writeFloat(scale); 103 parcel.writeFloat(offsetX); 104 parcel.writeFloat(offsetY); 105 recycle(); 106 } 107 108 @Override equals(Object other)109 public boolean equals(Object other) { 110 if (this == other) { 111 return true; 112 } 113 114 if (other == null || getClass() != other.getClass()) { 115 return false; 116 } 117 118 final MagnificationSpec s = (MagnificationSpec) other; 119 return scale == s.scale && offsetX == s.offsetX && offsetY == s.offsetY; 120 } 121 122 @Override hashCode()123 public int hashCode() { 124 int result = (scale != +0.0f ? Float.floatToIntBits(scale) : 0); 125 result = 31 * result + (offsetX != +0.0f ? Float.floatToIntBits(offsetX) : 0); 126 result = 31 * result + (offsetY != +0.0f ? Float.floatToIntBits(offsetY) : 0); 127 return result; 128 } 129 130 @Override toString()131 public String toString() { 132 StringBuilder builder = new StringBuilder(); 133 builder.append("<scale:"); 134 builder.append(Float.toString(scale)); 135 builder.append(",offsetX:"); 136 builder.append(Float.toString(offsetX)); 137 builder.append(",offsetY:"); 138 builder.append(Float.toString(offsetY)); 139 builder.append(">"); 140 return builder.toString(); 141 } 142 initFromParcel(Parcel parcel)143 private void initFromParcel(Parcel parcel) { 144 scale = parcel.readFloat(); 145 offsetX = parcel.readFloat(); 146 offsetY = parcel.readFloat(); 147 } 148 149 public static final Creator<MagnificationSpec> CREATOR = new Creator<MagnificationSpec>() { 150 @Override 151 public MagnificationSpec[] newArray(int size) { 152 return new MagnificationSpec[size]; 153 } 154 155 @Override 156 public MagnificationSpec createFromParcel(Parcel parcel) { 157 MagnificationSpec spec = MagnificationSpec.obtain(); 158 spec.initFromParcel(parcel); 159 return spec; 160 } 161 }; 162 } 163