1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
package cgeo.geocaching.utils;
import cgeo.geocaching.CgeoApplication;
import cgeo.geocaching.compatibility.Compatibility;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
public final class ImageUtils {
private ImageUtils() {
// Do not let this class be instantiated, this is a utility class.
}
/**
* Scales a bitmap to the device display size.
*
* @param image
* The image Bitmap representation to scale
* @return BitmapDrawable The scaled image
*/
public static BitmapDrawable scaleBitmapToFitDisplay(@NonNull final Bitmap image) {
Point displaySize = Compatibility.getDisplaySize();
final int maxWidth = displaySize.x - 25;
final int maxHeight = displaySize.y - 25;
return scaleBitmapTo(image, maxWidth, maxHeight);
}
/**
* Reads and scales an image file to the device display size.
*
* @param filename
* The image file to read and scale
* @return Bitmap The scaled image or Null if source image can't be read
*/
@Nullable
public static Bitmap readAndScaleImageToFitDisplay(@NonNull final String filename) {
Point displaySize = Compatibility.getDisplaySize();
final int maxWidth = displaySize.x - 25;
final int maxHeight = displaySize.y - 25;
final Bitmap image = readDownsampledImage(filename, maxWidth, maxHeight);
if (image == null) {
return null;
}
final BitmapDrawable scaledImage = scaleBitmapTo(image, maxWidth, maxHeight);
return scaledImage.getBitmap();
}
/**
* Scales a bitmap to the given bounds if it is larger, otherwise returns the original bitmap.
*
* @param image
* The bitmap to scale
* @return BitmapDrawable The scaled image
*/
@NonNull
private static BitmapDrawable scaleBitmapTo(@NonNull final Bitmap image, final int maxWidth, final int maxHeight) {
final CgeoApplication app = CgeoApplication.getInstance();
Bitmap result = image;
int width = image.getWidth();
int height = image.getHeight();
if (width > maxWidth || height > maxHeight) {
final double ratio = Math.min((double) maxHeight / (double) height, (double) maxWidth / (double) width);
width = (int) Math.ceil(width * ratio);
height = (int) Math.ceil(height * ratio);
result = Bitmap.createScaledBitmap(image, width, height, true);
}
final BitmapDrawable resultDrawable = new BitmapDrawable(app.getResources(), result);
resultDrawable.setBounds(new Rect(0, 0, width, height));
return resultDrawable;
}
/**
* Store a bitmap to file.
*
* @param bitmap
* The bitmap to store
* @param format
* The image format
* @param quality
* The image quality
* @param pathOfOutputImage
* Path to store to
*/
public static void storeBitmap(final Bitmap bitmap, final Bitmap.CompressFormat format, final int quality, final String pathOfOutputImage) {
try {
FileOutputStream out = new FileOutputStream(pathOfOutputImage);
BufferedOutputStream bos = new BufferedOutputStream(out);
bitmap.compress(format, quality, bos);
bos.flush();
bos.close();
} catch (IOException e) {
Log.e("ImageHelper.storeBitmap", e);
}
}
/**
* Scales an image to the desired bounds and encodes to file.
*
* @param filePath
* Image to read
* @param maxXY
* bounds
* @return filename and path, <tt>null</tt> if something fails
*/
@Nullable
public static String readScaleAndWriteImage(@NonNull final String filePath, final int maxXY) {
if (maxXY <= 0) {
return filePath;
}
Bitmap image = readDownsampledImage(filePath, maxXY, maxXY);
if (image == null) {
return null;
}
final BitmapDrawable scaledImage = scaleBitmapTo(image, maxXY, maxXY);
final File tempImageFile = ImageUtils.getOutputImageFile();
if (tempImageFile == null) {
Log.e("ImageUtils.readScaleAndWriteImage: unable to write scaled image");
return null;
}
final String uploadFilename = tempImageFile.getPath();
storeBitmap(scaledImage.getBitmap(), Bitmap.CompressFormat.JPEG, 75, uploadFilename);
return uploadFilename;
}
/**
* Reads and scales an image file with downsampling in one step to prevent memory consumption.
*
* @param filePath
* The file to read
* @param maxX
* The desired width
* @param maxY
* The desired height
* @return Bitmap the image or null if file can't be read
*/
@Nullable
public static Bitmap readDownsampledImage(@NonNull final String filePath, final int maxX, final int maxY) {
BitmapFactory.Options sizeOnlyOptions = new BitmapFactory.Options();
sizeOnlyOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, sizeOnlyOptions);
final int myMaxXY = Math.max(sizeOnlyOptions.outHeight, sizeOnlyOptions.outWidth);
final int maxXY = Math.max(maxX, maxY);
final int sampleSize = myMaxXY / maxXY;
if (sampleSize > 1) {
BitmapFactory.Options sampleOptions = new BitmapFactory.Options();
sampleOptions.inSampleSize = sampleSize;
return BitmapFactory.decodeFile(filePath, sampleOptions);
}
return BitmapFactory.decodeFile(filePath);
}
/** Create a File for saving an image or video
*
* @return the temporary image file to use, or <tt>null</tt> if the media directory could
* not be created.
* */
@Nullable
public static File getOutputImageFile() {
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.
File mediaStorageDir = new File(Compatibility.getExternalPictureDir(), "cgeo");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()) {
if (!FileUtils.mkdirs(mediaStorageDir)) {
Log.e("ImageUtils.getOutputImageFile: cannot create media storage directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(new Date());
return new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
}
@Nullable
public static Uri getOutputImageFileUri() {
final File file = getOutputImageFile();
if (file == null) {
return null;
}
return Uri.fromFile(file);
}
}
|
