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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(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      */
     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      */
     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