1/* 2 * Copyright (C) 2018 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 17package com.android.server.wm.utils; 18 19import static android.view.Surface.ROTATION_0; 20import static android.view.Surface.ROTATION_180; 21import static android.view.Surface.ROTATION_270; 22import static android.view.Surface.ROTATION_90; 23 24import android.annotation.Dimension; 25import android.graphics.Matrix; 26import android.view.Surface.Rotation; 27 28public class CoordinateTransforms { 29 30 private CoordinateTransforms() { 31 } 32 33 /** 34 * Sets a matrix such that given a rotation, it transforms physical display 35 * coordinates to that rotation's logical coordinates. 36 * 37 * @param rotation the rotation to which the matrix should transform 38 * @param out the matrix to be set 39 */ 40 public static void transformPhysicalToLogicalCoordinates(@Rotation int rotation, 41 @Dimension int physicalWidth, @Dimension int physicalHeight, Matrix out) { 42 switch (rotation) { 43 case ROTATION_0: 44 out.reset(); 45 break; 46 case ROTATION_90: 47 out.setRotate(270); 48 out.postTranslate(0, physicalWidth); 49 break; 50 case ROTATION_180: 51 out.setRotate(180); 52 out.postTranslate(physicalWidth, physicalHeight); 53 break; 54 case ROTATION_270: 55 out.setRotate(90); 56 out.postTranslate(physicalHeight, 0); 57 break; 58 default: 59 throw new IllegalArgumentException("Unknown rotation: " + rotation); 60 } 61 } 62} 63