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      1 /*
      2  * Copyright (C) 2010 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.gallery3d.data;
     18 
     19 import android.graphics.Bitmap;
     20 import android.graphics.BitmapRegionDecoder;
     21 
     22 import com.android.gallery3d.common.ApiHelper;
     23 import com.android.gallery3d.ui.ScreenNail;
     24 import com.android.gallery3d.util.ThreadPool.Job;
     25 
     26 // MediaItem represents an image or a video item.
     27 public abstract class MediaItem extends MediaObject {
     28     // NOTE: These type numbers are stored in the image cache, so it should not
     29     // not be changed without resetting the cache.
     30     public static final int TYPE_THUMBNAIL = 1;
     31     public static final int TYPE_MICROTHUMBNAIL = 2;
     32 
     33     public static final int CACHED_IMAGE_QUALITY = 95;
     34 
     35     public static final int IMAGE_READY = 0;
     36     public static final int IMAGE_WAIT = 1;
     37     public static final int IMAGE_ERROR = -1;
     38 
     39     public static final String MIME_TYPE_JPEG = "image/jpeg";
     40 
     41     private static final int BYTESBUFFE_POOL_SIZE = 4;
     42     private static final int BYTESBUFFER_SIZE = 200 * 1024;
     43 
     44     private static int sMicrothumbnailTargetSize = 200;
     45     private static BitmapPool sMicroThumbPool;
     46     private static final BytesBufferPool sMicroThumbBufferPool =
     47             new BytesBufferPool(BYTESBUFFE_POOL_SIZE, BYTESBUFFER_SIZE);
     48 
     49     private static int sThumbnailTargetSize = 640;
     50     private static final BitmapPool sThumbPool =
     51             ApiHelper.HAS_REUSING_BITMAP_IN_BITMAP_FACTORY
     52             ? new BitmapPool(4)
     53             : null;
     54 
     55     // TODO: fix default value for latlng and change this.
     56     public static final double INVALID_LATLNG = 0f;
     57 
     58     public abstract Job<Bitmap> requestImage(int type);
     59     public abstract Job<BitmapRegionDecoder> requestLargeImage();
     60 
     61     public MediaItem(Path path, long version) {
     62         super(path, version);
     63     }
     64 
     65     public long getDateInMs() {
     66         return 0;
     67     }
     68 
     69     public String getName() {
     70         return null;
     71     }
     72 
     73     public void getLatLong(double[] latLong) {
     74         latLong[0] = INVALID_LATLNG;
     75         latLong[1] = INVALID_LATLNG;
     76     }
     77 
     78     public String[] getTags() {
     79         return null;
     80     }
     81 
     82     public Face[] getFaces() {
     83         return null;
     84     }
     85 
     86     // The rotation of the full-resolution image. By default, it returns the value of
     87     // getRotation().
     88     public int getFullImageRotation() {
     89         return getRotation();
     90     }
     91 
     92     public int getRotation() {
     93         return 0;
     94     }
     95 
     96     public long getSize() {
     97         return 0;
     98     }
     99 
    100     public abstract String getMimeType();
    101 
    102     public String getFilePath() {
    103         return "";
    104     }
    105 
    106     // Returns width and height of the media item.
    107     // Returns 0, 0 if the information is not available.
    108     public abstract int getWidth();
    109     public abstract int getHeight();
    110 
    111     // This is an alternative for requestImage() in PhotoPage. If this
    112     // is implemented, you don't need to implement requestImage().
    113     public ScreenNail getScreenNail() {
    114         return null;
    115     }
    116 
    117     public static int getTargetSize(int type) {
    118         switch (type) {
    119             case TYPE_THUMBNAIL:
    120                 return sThumbnailTargetSize;
    121             case TYPE_MICROTHUMBNAIL:
    122                 return sMicrothumbnailTargetSize;
    123             default:
    124                 throw new RuntimeException(
    125                     "should only request thumb/microthumb from cache");
    126         }
    127     }
    128 
    129     public static BitmapPool getMicroThumbPool() {
    130         if (ApiHelper.HAS_REUSING_BITMAP_IN_BITMAP_FACTORY && sMicroThumbPool == null) {
    131             initializeMicroThumbPool();
    132         }
    133         return sMicroThumbPool;
    134     }
    135 
    136     public static BitmapPool getThumbPool() {
    137         return sThumbPool;
    138     }
    139 
    140     public static BytesBufferPool getBytesBufferPool() {
    141         return sMicroThumbBufferPool;
    142     }
    143 
    144     private static void initializeMicroThumbPool() {
    145         sMicroThumbPool =
    146                 ApiHelper.HAS_REUSING_BITMAP_IN_BITMAP_FACTORY
    147                 ? new BitmapPool(sMicrothumbnailTargetSize, sMicrothumbnailTargetSize, 16)
    148                 : null;
    149     }
    150 
    151     public static void setThumbnailSizes(int size, int microSize) {
    152         sThumbnailTargetSize = size;
    153         if (sMicrothumbnailTargetSize != microSize) {
    154             sMicrothumbnailTargetSize = microSize;
    155             initializeMicroThumbPool();
    156         }
    157     }
    158 }
    159