Adrian Roos | 1cf58505 | 2018-01-03 18:43:27 +0100 | [diff] [blame] | 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 | |
| 17 | package com.android.server.wm.utils; |
| 18 | |
| 19 | import static android.view.Surface.ROTATION_0; |
| 20 | import static android.view.Surface.ROTATION_180; |
| 21 | import static android.view.Surface.ROTATION_270; |
| 22 | import static android.view.Surface.ROTATION_90; |
| 23 | |
| 24 | import android.annotation.Dimension; |
| 25 | import android.graphics.Matrix; |
| 26 | import android.view.Surface.Rotation; |
| 27 | |
| 28 | public 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 | } |