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1 // Copyright 2012 The Chromium Authors. All rights reserved. | 1 // Copyright 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 package org.chromium.ui.gfx; | 5 package org.chromium.ui.gfx; |
6 | 6 |
7 import android.content.res.Resources; | 7 import android.content.res.Resources; |
8 import android.graphics.Bitmap; | 8 import android.graphics.Bitmap; |
9 import android.graphics.BitmapFactory; | 9 import android.graphics.BitmapFactory; |
10 | 10 |
11 import org.chromium.base.CalledByNative; | 11 import org.chromium.base.CalledByNative; |
12 import org.chromium.base.JNINamespace; | 12 import org.chromium.base.JNINamespace; |
13 | 13 |
14 /** | 14 /** |
15 * Helper class to decode and sample down bitmap resources. | 15 * Helper class to decode and sample down bitmap resources. |
16 */ | 16 */ |
17 @JNINamespace("gfx") | 17 @JNINamespace("gfx") |
18 public class BitmapHelper { | 18 public class BitmapHelper { |
19 private static final int BITMAP_CONFIG_NO_CONFIG = 0; | |
bulach
2014/02/17 10:33:58
please, use the "shared enum" mechanism, it's much
sivag
2014/02/18 16:06:22
Done.
| |
20 private static final int BITMAP_CONFIG_ALPHA_8 = 1; | |
21 private static final int BITMAP_CONFIG_ARGB_4444 = 2; | |
22 private static final int BITMAP_CONFIG_ARGB_8888 = 3; | |
23 private static final int BITMAP_CONFIG_RGB_565 = 4; | |
24 | |
19 @CalledByNative | 25 @CalledByNative |
20 private static Bitmap createBitmap(int width, | 26 private static Bitmap createBitmap(int width, |
21 int height, | 27 int height, |
22 boolean is565Config) { | 28 boolean is565Config) { |
23 if (is565Config) { | 29 if (is565Config) { |
24 return Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); | 30 return Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); |
25 } | 31 } |
26 return Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); | 32 return Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); |
27 } | 33 } |
28 | 34 |
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68 final int widthRatio = Math.round((float) width / (float) reqWidth); | 74 final int widthRatio = Math.round((float) width / (float) reqWidth); |
69 | 75 |
70 // Choose the smallest ratio as inSampleSize value, this will guaran tee | 76 // Choose the smallest ratio as inSampleSize value, this will guaran tee |
71 // a final image with both dimensions larger than or equal to the | 77 // a final image with both dimensions larger than or equal to the |
72 // requested height and width. | 78 // requested height and width. |
73 inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio; | 79 inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio; |
74 } | 80 } |
75 | 81 |
76 return inSampleSize; | 82 return inSampleSize; |
77 } | 83 } |
84 | |
85 /** | |
86 * Provides a matching integer constant for the Bitmap.Config value passed. | |
87 * | |
88 * @param Bitmap Configuration value. | |
89 * @return Matching integer constant for the Bitmap.Config value passed. | |
90 */ | |
91 @CalledByNative | |
92 private static int bitmapConfig(Bitmap.Config bitmap_config) { | |
93 switch (bitmap_config) { | |
94 case ALPHA_8: | |
95 return BITMAP_CONFIG_ALPHA_8; | |
96 case ARGB_4444: | |
97 return BITMAP_CONFIG_ARGB_4444; | |
98 case ARGB_8888: | |
99 return BITMAP_CONFIG_ARGB_8888; | |
100 case RGB_565: | |
101 return BITMAP_CONFIG_RGB_565; | |
102 default: | |
103 return BITMAP_CONFIG_NO_CONFIG; | |
104 } | |
105 } | |
78 } | 106 } |
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