1 /* 2 * Copyright (C) 2014 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.camera; 18 19 import android.content.Context; 20 import android.content.res.Configuration; 21 import android.view.Surface; 22 23 import com.android.camera.debug.Log; 24 import com.android.camera.debug.Log.Tag; 25 import com.android.camera.util.CameraUtil; 26 import com.android.camera.util.Size; 27 28 import java.util.ArrayList; 29 30 /** 31 * Common utility methods used in capture modules. 32 */ 33 public class CaptureModuleUtil { 34 private static final Tag TAG = new Tag("CaptureModuleUtil"); 35 getDeviceNaturalOrientation(Context context)36 public static int getDeviceNaturalOrientation(Context context) { 37 Configuration config = context.getResources().getConfiguration(); 38 int rotation = CameraUtil.getDisplayRotation(context); 39 40 if (((rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_180) && 41 config.orientation == Configuration.ORIENTATION_LANDSCAPE) || 42 ((rotation == Surface.ROTATION_90 || rotation == Surface.ROTATION_270) && 43 config.orientation == Configuration.ORIENTATION_PORTRAIT)) { 44 return Configuration.ORIENTATION_LANDSCAPE; 45 } else { 46 return Configuration.ORIENTATION_PORTRAIT; 47 } 48 } 49 50 /** 51 * Equivalent to the 52 * {@link CameraUtil#getOptimalPreviewSize(android.content.Context, java.util.List, double)} 53 * method for the camera1 api. 54 */ getOptimalPreviewSize(Context context, Size[] sizes, double targetRatio)55 public static Size getOptimalPreviewSize(Context context, Size[] sizes, 56 double targetRatio) { 57 // TODO(andyhuibers): Don't hardcode this but use device's measurements. 58 final int MAX_ASPECT_HEIGHT = 1080; 59 60 // Count sizes with height <= 1080p to mimic camera1 api behavior. 61 int count = 0; 62 for (Size s : sizes) { 63 if (s.getHeight() <= MAX_ASPECT_HEIGHT) { 64 count++; 65 } 66 } 67 ArrayList<Size> camera1Sizes = new ArrayList<Size>(count); 68 69 // Set array of all sizes with height <= 1080p 70 for (Size s : sizes) { 71 if (s.getHeight() <= MAX_ASPECT_HEIGHT) { 72 camera1Sizes.add(new Size(s.getWidth(), s.getHeight())); 73 } 74 } 75 76 int optimalIndex = CameraUtil 77 .getOptimalPreviewSizeIndex(context, camera1Sizes, targetRatio); 78 79 if (optimalIndex == -1) { 80 return null; 81 } 82 83 Size optimal = camera1Sizes.get(optimalIndex); 84 for (Size s : sizes) { 85 if (s.getWidth() == optimal.getWidth() && s.getHeight() == optimal.getHeight()) { 86 return s; 87 } 88 } 89 return null; 90 } 91 92 /** 93 * Selects the preview buffer dimensions that are closest in size to the 94 * size of the view containing the preview. 95 */ pickBufferDimensions(Size[] supportedPreviewSizes, double bestPreviewAspectRatio, Context context)96 public static Size pickBufferDimensions(Size[] supportedPreviewSizes, 97 double bestPreviewAspectRatio, 98 Context context) { 99 // Swap dimensions if the device is not in its natural orientation. 100 boolean swapDimens = (CameraUtil.getDisplayRotation(context) % 180) == 90; 101 // Swap dimensions if the device's natural orientation doesn't match 102 // the sensor orientation. 103 if (CaptureModuleUtil.getDeviceNaturalOrientation(context) 104 == Configuration.ORIENTATION_PORTRAIT) { 105 swapDimens = !swapDimens; 106 } 107 double bestAspect = bestPreviewAspectRatio; 108 if (swapDimens) { 109 bestAspect = 1 / bestAspect; 110 } 111 112 Size pick = CaptureModuleUtil.getOptimalPreviewSize(context, supportedPreviewSizes, 113 bestPreviewAspectRatio); 114 Log.d(TAG, "Picked buffer size: " + pick.toString()); 115 return pick; 116 } 117 } 118