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1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
Theresa
2017/03/28 20:40:27
s/2016/2017
Finnur
2017/03/31 14:26:49
Done.
| |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 package org.chromium.chrome.browser.photo_picker; | |
6 | |
7 import android.graphics.Bitmap; | |
8 import android.graphics.BitmapFactory; | |
9 | |
10 import java.io.FileDescriptor; | |
11 | |
12 class BitmapUtils { | |
13 /** | |
14 * Takes a |bitmap| and returns a square thumbnail of |width| from the cente r of the bitmap | |
15 * specified. | |
16 * @param bitmap The bitmap to adjust. | |
17 * @param width The desired width. | |
18 * @return The new bitmap thumbnail. | |
19 */ | |
20 public static Bitmap sizeBitmap(Bitmap bitmap, int width) { | |
21 bitmap = ensureMinSize(bitmap, width); | |
22 bitmap = cropToSquare(bitmap, width); | |
23 return bitmap; | |
24 } | |
25 | |
26 /** | |
27 * Given a FileDescriptor, decodes the contents and returns a bitmap of size |width|x|width|. | |
28 * @param descriptor The FileDescriptor for the file to read. | |
29 * @param width The width of the bitmap to return. | |
30 * @return The resulting bitmap. | |
31 */ | |
32 public static Bitmap decodeBitmapFromFileDescriptor(FileDescriptor descripto r, int width) { | |
33 BitmapFactory.Options options = new BitmapFactory.Options(); | |
34 options.inJustDecodeBounds = true; | |
35 BitmapFactory.decodeFileDescriptor(descriptor, null, options); | |
36 options.inSampleSize = calculateInSampleSize(options, width, width); | |
37 options.inJustDecodeBounds = false; | |
38 Bitmap bitmap = BitmapFactory.decodeFileDescriptor(descriptor, null, opt ions); | |
39 if (bitmap == null) { | |
40 return null; | |
Theresa
2017/03/28 20:40:27
nit: in line "return null" and add blank space:
Finnur
2017/03/31 14:26:49
Done.
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41 } | |
42 return sizeBitmap(bitmap, width); | |
43 } | |
44 | |
45 /** | |
46 * Given a file path, decodes the contents of the file and returns a bitmap of size | |
47 * |width|x|width|. | |
48 * @param filePath The path to the file to read. | |
49 * @param width The width of the bitmap to return. | |
50 * @return The resulting bitmap. | |
51 */ | |
52 public static Bitmap decodeBitmapFromDisk(String filePath, int width) { | |
53 BitmapFactory.Options options = new BitmapFactory.Options(); | |
54 options.inJustDecodeBounds = true; | |
55 BitmapFactory.decodeFile(filePath, options); | |
56 options.inSampleSize = calculateInSampleSize(options, width, width); | |
57 options.inJustDecodeBounds = false; | |
Theresa
2017/03/28 20:40:28
nit: Maybe there should be a helper method that cr
Finnur
2017/03/31 14:26:49
Done (I think).
| |
58 Bitmap bitmap = BitmapFactory.decodeFile(filePath, options); | |
59 if (bitmap == null) { | |
60 return null; | |
61 } | |
62 return sizeBitmap(bitmap, width); | |
63 } | |
64 | |
65 /** | |
66 * Calculates the sub-sampling factor (inSampleSize option from the BitmapFa ctory) for a given | |
Theresa
2017/03/28 20:40:27
nit: {@link BitmapFactory#inSampleSize}?
Finnur
2017/03/31 14:26:49
Done.
| |
67 * bitmap option, which will be used to create a bitmap of a pre-determined size (no larger than | |
68 * |width| and |height|). | |
69 * @param options The bitmap options to consider. | |
70 * @param width The requested width. | |
71 * @param height The requested height. | |
72 * @return The sub-sampling factor (1 = no change, 2 = half-size, etc). | |
73 */ | |
74 private static int calculateInSampleSize(BitmapFactory.Options options, int width, int height) { | |
75 int inSampleSize = 1; | |
76 | |
77 if (options.outHeight > height || options.outWidth > width) { | |
78 final int halfHeight = options.outHeight / 2; | |
79 final int halfWidth = options.outWidth / 2; | |
80 | |
81 while ((halfHeight / inSampleSize) >= height || (halfWidth / inSampl eSize) >= width) { | |
82 inSampleSize *= 2; | |
83 } | |
84 } | |
85 | |
86 return inSampleSize; | |
87 } | |
88 | |
89 /** | |
90 * Scales a |bitmap| to a certain size. | |
91 * @param bitmap The bitmap to scale. | |
92 * @param scaleMaxSize What to scale it to. | |
93 * @param filter true if the source should be filtered. | |
Theresa
2017/03/28 20:40:27
nit: s/true/True
Finnur
2017/03/31 14:26:49
Done.
| |
94 * @return The resulting scaled bitmap. | |
95 */ | |
96 public static Bitmap scale(Bitmap bitmap, float scaleMaxSize, boolean filter ) { | |
97 float ratio = Math.min((float) scaleMaxSize / bitmap.getWidth(), | |
98 (float) scaleMaxSize / bitmap.getHeight()); | |
99 int height = Math.round(ratio * bitmap.getHeight()); | |
100 int width = Math.round(ratio * bitmap.getWidth()); | |
101 | |
102 return Bitmap.createScaledBitmap(bitmap, width, height, filter); | |
103 } | |
104 | |
105 /** | |
106 * Ensures a |bitmap| is at least |size| in both width and height. | |
107 * @param bitmap The bitmap to modify. | |
108 * @param size The minimum size (width and height). | |
109 * @return The resulting (scaled) bitmap. | |
110 */ | |
111 private static Bitmap ensureMinSize(Bitmap bitmap, int size) { | |
112 int width = bitmap.getWidth(); | |
113 int height = bitmap.getHeight(); | |
114 if (width < size) { | |
115 float scale = (float) size / width; | |
116 width = size; | |
117 height *= scale; | |
118 } | |
119 | |
120 if (height < size) { | |
121 float scale = (float) size / height; | |
122 height = size; | |
123 width *= scale; | |
124 } | |
125 | |
126 return Bitmap.createScaledBitmap(bitmap, width, height, true); | |
127 } | |
128 | |
129 /** | |
130 * Crops a |bitmap| to a certain square |size| | |
131 * @param bitmap The bitmap to crop. | |
132 * @param size The size desired (width and height). | |
133 * @return The resulting (square) bitmap. | |
134 */ | |
135 private static Bitmap cropToSquare(Bitmap bitmap, int size) { | |
136 int x = 0; | |
137 int y = 0; | |
138 int width = bitmap.getWidth(); | |
139 int height = bitmap.getHeight(); | |
140 | |
141 if (width > size) x = (width - size) / 2; | |
142 if (height > size) y = (height - size) / 2; | |
143 return Bitmap.createBitmap(bitmap, x, y, size, size); | |
144 } | |
145 } | |
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