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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
* Copyright (C) 2012 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.mail.utils;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
/**
* Provides static functions to decode bitmaps at the optimal size
*/
public class BitmapUtil {
private static final String TAG = LogTag.getLogTag();
private static final boolean DEBUG = false;
private BitmapUtil() {
}
/**
* Decode an image into a Bitmap, using sub-sampling if the hinted dimensions call for it.
* Does not crop to fit the hinted dimensions.
*
* @param src an encoded image
* @param w hint width in px
* @param h hint height in px
* @return a decoded Bitmap that is not exactly sized to the hinted dimensions.
*/
public static Bitmap decodeByteArray(byte[] src, int w, int h) {
try {
// calculate sample size based on w/h
final BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inJustDecodeBounds = true;
BitmapFactory.decodeByteArray(src, 0, src.length, opts);
if (opts.mCancel || opts.outWidth == -1 || opts.outHeight == -1) {
return null;
}
opts.inSampleSize = Math.min(opts.outWidth / w, opts.outHeight / h);
opts.inJustDecodeBounds = false;
return BitmapFactory.decodeByteArray(src, 0, src.length, opts);
} catch (Throwable t) {
LogUtils.w(TAG, t, "BitmapUtils unable to decode image");
return null;
}
}
/**
* Decode an image into a Bitmap, using sub-sampling if the desired dimensions call for it.
* Also applies a center-crop a la {@link android.widget.ImageView.ScaleType#CENTER_CROP}.
*
* @param src an encoded image
* @param w desired width in px
* @param h desired height in px
* @return an exactly-sized decoded Bitmap that is center-cropped.
*/
public static Bitmap decodeByteArrayWithCenterCrop(byte[] src, int w, int h) {
try {
final Bitmap decoded = decodeByteArray(src, w, h);
return centerCrop(decoded, w, h);
} catch (Throwable t) {
LogUtils.w(TAG, t, "BitmapUtils unable to crop image");
return null;
}
}
/**
* Returns a new Bitmap copy with a center-crop effect a la
* {@link android.widget.ImageView.ScaleType#CENTER_CROP}. May return the input bitmap if no
* scaling is necessary.
*
* @param src original bitmap of any size
* @param w desired width in px
* @param h desired height in px
* @return a copy of src conforming to the given width and height, or src itself if it already
* matches the given width and height
*/
public static Bitmap centerCrop(final Bitmap src, final int w, final int h) {
return crop(src, w, h, 0.5f, 0.5f);
}
/**
* Returns a new Bitmap copy with a crop effect depending on the crop anchor given. 0.5f is like
* {@link android.widget.ImageView.ScaleType#CENTER_CROP}. The crop anchor will be be nudged
* so the entire cropped bitmap will fit inside the src. May return the input bitmap if no
* scaling is necessary.
*
*
* Example of changing verticalCenterPercent:
* _________ _________
* | | | |
* | | |_________|
* | | | |/___0.3f
* |---------| |_________|\
* | |<---0.5f | |
* |---------| | |
* | | | |
* | | | |
* |_________| |_________|
*
* @param src original bitmap of any size
* @param w desired width in px
* @param h desired height in px
* @param horizontalCenterPercent determines which part of the src to crop from. Range from 0
* .0f to 1.0f. The value determines which part of the src
* maps to the horizontal center of the resulting bitmap.
* @param verticalCenterPercent determines which part of the src to crop from. Range from 0
* .0f to 1.0f. The value determines which part of the src maps
* to the vertical center of the resulting bitmap.
* @return a copy of src conforming to the given width and height, or src itself if it already
* matches the given width and height
*/
public static Bitmap crop(final Bitmap src, final int w, final int h,
final float horizontalCenterPercent, final float verticalCenterPercent) {
if (horizontalCenterPercent < 0 || horizontalCenterPercent > 1 || verticalCenterPercent < 0
|| verticalCenterPercent > 1) {
throw new IllegalArgumentException(
"horizontalCenterPercent and verticalCenterPercent must be between 0.0f and "
+ "1.0f, inclusive.");
}
final int srcWidth = src.getWidth();
final int srcHeight = src.getHeight();
// exit early if no resize/crop needed
if (w == srcWidth && h == srcHeight) {
return src;
}
final Matrix m = new Matrix();
final float scale = Math.max(
(float) w / srcWidth,
(float) h / srcHeight);
m.setScale(scale, scale);
final int srcCroppedW, srcCroppedH;
int srcX, srcY;
srcCroppedW = Math.round(w / scale);
srcCroppedH = Math.round(h / scale);
srcX = (int) (srcWidth * horizontalCenterPercent - srcCroppedW / 2);
srcY = (int) (srcHeight * verticalCenterPercent - srcCroppedH / 2);
// Nudge srcX and srcY to be within the bounds of src
srcX = Math.max(Math.min(srcX, srcWidth - srcCroppedW), 0);
srcY = Math.max(Math.min(srcY, srcHeight - srcCroppedH), 0);
final Bitmap cropped = Bitmap.createBitmap(src, srcX, srcY, srcCroppedW, srcCroppedH, m,
true /* filter */);
if (DEBUG) LogUtils.i(TAG,
"BitmapUtils IN centerCrop, srcW/H=%s/%s desiredW/H=%s/%s srcX/Y=%s/%s" +
" innerW/H=%s/%s scale=%s resultW/H=%s/%s",
srcWidth, srcHeight, w, h, srcX, srcY, srcCroppedW, srcCroppedH, scale,
cropped.getWidth(), cropped.getHeight());
if (DEBUG && (w != cropped.getWidth() || h != cropped.getHeight())) {
LogUtils.e(TAG, new Error(), "BitmapUtils last center crop violated assumptions.");
}
return cropped;
}
/**
* Frames the input bitmap in a circle.
*/
public static Bitmap frameBitmapInCircle(Bitmap input) {
if (input == null) {
return null;
}
// Crop the image if not squared.
int inputWidth = input.getWidth();
int inputHeight = input.getHeight();
int targetX, targetY, targetSize;
if (inputWidth >= inputHeight) {
targetX = inputWidth / 2 - inputHeight / 2;
targetY = 0;
targetSize = inputHeight;
} else {
targetX = 0;
targetY = inputHeight / 2 - inputWidth / 2;
targetSize = inputWidth;
}
// Create an output bitmap and a canvas to draw on it.
Bitmap output = Bitmap.createBitmap(targetSize, targetSize, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
// Create a black paint to draw the mask.
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.BLACK);
// Draw a circle.
canvas.drawCircle(targetSize / 2, targetSize / 2, targetSize / 2, paint);
// Replace the black parts of the mask with the input image.
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(input, targetX /* left */, targetY /* top */, paint);
return output;
}
}
|
