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      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 
     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      */
     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      */
     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      */
    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