1 /* 2 * Copyright (C) 2017 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 package com.example.android.system.runtimepermissions.extensions 17 18 import android.hardware.Camera 19 import android.view.Surface 20 21 /** 22 * Calculate the correct orientation for a [Camera] preview that is displayed on screen. 23 * 24 * 25 * Implementation is based on the sample code provided in 26 * [Camera.setDisplayOrientation]. 27 */ 28 fun Camera.CameraInfo.calculatePreviewOrientation(rotation: Int): Int { 29 30 val degrees = when (rotation) { 31 Surface.ROTATION_0 -> 0 32 Surface.ROTATION_90 -> 90 33 Surface.ROTATION_180 -> 180 34 Surface.ROTATION_270 -> 270 35 else -> 0 36 } 37 38 return when (facing) { 39 Camera.CameraInfo.CAMERA_FACING_FRONT -> (360 - ((orientation + degrees) % 360)) % 360 40 Camera.CameraInfo.CAMERA_FACING_BACK -> (orientation - degrees + 360) % 360 41 else -> orientation 42 } 43 }
