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
|
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.gallery3d.common;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.net.Uri;
import android.os.Build;
import android.util.Log;
import android.view.WindowManager;
import com.android.gallery3d.exif.ExifInterface;
import com.android.launcher3.WallpaperCropActivity;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
public class BitmapUtils {
private static final String TAG = "BitmapUtils";
// Find the min x that 1 / x >= scale
public static int computeSampleSizeLarger(float scale) {
int initialSize = (int) Math.floor(1f / scale);
if (initialSize <= 1) return 1;
return initialSize <= 8
? Utils.prevPowerOf2(initialSize)
: initialSize / 8 * 8;
}
public static Bitmap resizeBitmapByScale(
Bitmap bitmap, float scale, boolean recycle) {
int width = Math.round(bitmap.getWidth() * scale);
int height = Math.round(bitmap.getHeight() * scale);
if (width == bitmap.getWidth()
&& height == bitmap.getHeight()) return bitmap;
Bitmap target = Bitmap.createBitmap(width, height, getConfig(bitmap));
Canvas canvas = new Canvas(target);
canvas.scale(scale, scale);
Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG | Paint.DITHER_FLAG);
canvas.drawBitmap(bitmap, 0, 0, paint);
if (recycle) bitmap.recycle();
return target;
}
private static Bitmap.Config getConfig(Bitmap bitmap) {
Bitmap.Config config = bitmap.getConfig();
if (config == null) {
config = Bitmap.Config.ARGB_8888;
}
return config;
}
/**
* As a ratio of screen height, the total distance we want the parallax effect to span
* horizontally
*/
public static float wallpaperTravelToScreenWidthRatio(int width, int height) {
float aspectRatio = width / (float) height;
// At an aspect ratio of 16/10, the wallpaper parallax effect should span 1.5 * screen width
// At an aspect ratio of 10/16, the wallpaper parallax effect should span 1.2 * screen width
// We will use these two data points to extrapolate how much the wallpaper parallax effect
// to span (ie travel) at any aspect ratio:
final float ASPECT_RATIO_LANDSCAPE = 16/10f;
final float ASPECT_RATIO_PORTRAIT = 10/16f;
final float WALLPAPER_WIDTH_TO_SCREEN_RATIO_LANDSCAPE = 1.5f;
final float WALLPAPER_WIDTH_TO_SCREEN_RATIO_PORTRAIT = 1.2f;
// To find out the desired width at different aspect ratios, we use the following two
// formulas, where the coefficient on x is the aspect ratio (width/height):
// (16/10)x + y = 1.5
// (10/16)x + y = 1.2
// We solve for x and y and end up with a final formula:
final float x =
(WALLPAPER_WIDTH_TO_SCREEN_RATIO_LANDSCAPE - WALLPAPER_WIDTH_TO_SCREEN_RATIO_PORTRAIT) /
(ASPECT_RATIO_LANDSCAPE - ASPECT_RATIO_PORTRAIT);
final float y = WALLPAPER_WIDTH_TO_SCREEN_RATIO_PORTRAIT - x * ASPECT_RATIO_PORTRAIT;
return x * aspectRatio + y;
}
private static Point sDefaultWallpaperSize;
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
public static Point getDefaultWallpaperSize(Resources res, WindowManager windowManager) {
if (sDefaultWallpaperSize == null) {
Point minDims = new Point();
Point maxDims = new Point();
windowManager.getDefaultDisplay().getCurrentSizeRange(minDims, maxDims);
int maxDim = Math.max(maxDims.x, maxDims.y);
int minDim = Math.max(minDims.x, minDims.y);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1) {
Point realSize = new Point();
windowManager.getDefaultDisplay().getRealSize(realSize);
maxDim = Math.max(realSize.x, realSize.y);
minDim = Math.min(realSize.x, realSize.y);
}
// We need to ensure that there is enough extra space in the wallpaper
// for the intended parallax effects
final int defaultWidth, defaultHeight;
if (res.getConfiguration().smallestScreenWidthDp >= 720) {
defaultWidth = (int) (maxDim * wallpaperTravelToScreenWidthRatio(maxDim, minDim));
defaultHeight = maxDim;
} else {
defaultWidth = Math.max((int) (minDim * WallpaperCropActivity.WALLPAPER_SCREENS_SPAN), maxDim);
defaultHeight = maxDim;
}
sDefaultWallpaperSize = new Point(defaultWidth, defaultHeight);
}
return sDefaultWallpaperSize;
}
public static int getRotationFromExif(Context context, Uri uri) {
return BitmapUtils.getRotationFromExifHelper(null, 0, context, uri);
}
public static int getRotationFromExif(Resources res, int resId) {
return BitmapUtils.getRotationFromExifHelper(res, resId, null, null);
}
private static int getRotationFromExifHelper(Resources res, int resId, Context context, Uri uri) {
ExifInterface ei = new ExifInterface();
InputStream is = null;
BufferedInputStream bis = null;
try {
if (uri != null) {
is = context.getContentResolver().openInputStream(uri);
bis = new BufferedInputStream(is);
ei.readExif(bis);
} else {
is = res.openRawResource(resId);
bis = new BufferedInputStream(is);
ei.readExif(bis);
}
Integer ori = ei.getTagIntValue(ExifInterface.TAG_ORIENTATION);
if (ori != null) {
return ExifInterface.getRotationForOrientationValue(ori.shortValue());
}
} catch (IOException e) {
Log.w(TAG, "Getting exif data failed", e);
} catch (NullPointerException e) {
// Sometimes the ExifInterface has an internal NPE if Exif data isn't valid
Log.w(TAG, "Getting exif data failed", e);
} finally {
Utils.closeSilently(bis);
Utils.closeSilently(is);
}
return 0;
}
}
|
