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(); 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(java.util.List, double)} 53 * method for the camera1 api. 54 */ getOptimalPreviewSize(Size[] sizes,double targetRatio)55 public static Size getOptimalPreviewSize(Size[] sizes,double targetRatio) { 56 return getOptimalPreviewSize(sizes, targetRatio, null); 57 } 58 59 /** 60 * Returns the best preview size based on the current display resolution, 61 * the available preview sizes, the target aspect ratio (typically the 62 * aspect ratio of the picture to be taken) as well as a maximum allowed 63 * tolerance. If tolerance is 'null', a default tolerance will be used. 64 */ getOptimalPreviewSize(Size[] sizes, double targetRatio, Double aspectRatioTolerance)65 public static Size getOptimalPreviewSize(Size[] sizes, 66 double targetRatio, Double aspectRatioTolerance) { 67 // TODO(andyhuibers): Don't hardcode this but use device's measurements. 68 final int MAX_ASPECT_HEIGHT = 1080; 69 70 // Count sizes with height <= 1080p to mimic camera1 api behavior. 71 int count = 0; 72 for (Size s : sizes) { 73 if (s.getHeight() <= MAX_ASPECT_HEIGHT) { 74 count++; 75 } 76 } 77 ArrayList<Size> camera1Sizes = new ArrayList<Size>(count); 78 79 // Set array of all sizes with height <= 1080p 80 for (Size s : sizes) { 81 if (s.getHeight() <= MAX_ASPECT_HEIGHT) { 82 camera1Sizes.add(new Size(s.getWidth(), s.getHeight())); 83 } 84 } 85 86 int optimalIndex = CameraUtil 87 .getOptimalPreviewSizeIndex(camera1Sizes, targetRatio, 88 aspectRatioTolerance); 89 90 if (optimalIndex == -1) { 91 return null; 92 } 93 94 Size optimal = camera1Sizes.get(optimalIndex); 95 for (Size s : sizes) { 96 if (s.getWidth() == optimal.getWidth() && s.getHeight() == optimal.getHeight()) { 97 return s; 98 } 99 } 100 return null; 101 } 102 103 /** 104 * Selects the preview buffer dimensions that are closest in size to the 105 * size of the view containing the preview. 106 */ pickBufferDimensions(Size[] supportedPreviewSizes, double bestPreviewAspectRatio, Context context)107 public static Size pickBufferDimensions(Size[] supportedPreviewSizes, 108 double bestPreviewAspectRatio, 109 Context context) { 110 // Swap dimensions if the device is not in its natural orientation. 111 boolean swapDimens = (CameraUtil.getDisplayRotation() % 180) == 90; 112 // Swap dimensions if the device's natural orientation doesn't match 113 // the sensor orientation. 114 if (CaptureModuleUtil.getDeviceNaturalOrientation(context) 115 == Configuration.ORIENTATION_PORTRAIT) { 116 swapDimens = !swapDimens; 117 } 118 double bestAspect = bestPreviewAspectRatio; 119 if (swapDimens) { 120 bestAspect = 1 / bestAspect; 121 } 122 123 Size pick = CaptureModuleUtil.getOptimalPreviewSize(supportedPreviewSizes, 124 bestPreviewAspectRatio, null); 125 Log.d(TAG, "Picked buffer size: " + pick.toString()); 126 return pick; 127 } 128 } 129