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1 /*
2  * Copyright (C) 2019 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package com.android.wallpaper.util;
17 
18 import android.content.Context;
19 import android.graphics.Bitmap;
20 import android.graphics.Rect;
21 import android.renderscript.Allocation;
22 import android.renderscript.Element;
23 import android.renderscript.RenderScript;
24 import android.renderscript.ScriptIntrinsicBlur;
25 import android.util.Log;
26 
27 /**
28  * Class with different bitmap processors to apply to bitmaps
29  */
30 public final class BitmapProcessor {
31 
32     private static final String TAG = "BitmapProcessor";
33     private static final float BLUR_RADIUS = 20f;
34     private static final int DOWNSAMPLE = 5;
35 
BitmapProcessor()36     private BitmapProcessor() {
37     }
38 
39     /**
40      * Function that blurs the content of a bitmap.
41      *
42      * @param context   the Application Context
43      * @param bitmap    the bitmap we want to blur.
44      * @param outWidth  the end width of the blurred bitmap.
45      * @param outHeight the end height of the blurred bitmap.
46      * @return the blurred bitmap.
47      */
blur(Context context, Bitmap bitmap, int outWidth, int outHeight)48     public static Bitmap blur(Context context, Bitmap bitmap, int outWidth,
49             int outHeight) {
50         RenderScript renderScript = RenderScript.create(context);
51         ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(renderScript,
52                 Element.U8_4(renderScript));
53         Allocation input = null;
54         Allocation output = null;
55         Bitmap inBitmap = null;
56 
57         try {
58             Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
59             WallpaperCropUtils.fitToSize(rect, outWidth / DOWNSAMPLE, outHeight / DOWNSAMPLE);
60 
61             inBitmap = Bitmap.createScaledBitmap(bitmap, rect.width(), rect.height(),
62                     true /* filter */);
63 
64             // Render script blurs only support ARGB_8888, we need a conversion if we got a
65             // different bitmap config.
66             if (inBitmap.getConfig() != Bitmap.Config.ARGB_8888) {
67                 Bitmap oldIn = inBitmap;
68                 inBitmap = oldIn.copy(Bitmap.Config.ARGB_8888, false /* isMutable */);
69                 oldIn.recycle();
70             }
71             Bitmap outBitmap = Bitmap.createBitmap(inBitmap.getWidth(), inBitmap.getHeight(),
72                     Bitmap.Config.ARGB_8888);
73 
74             input = Allocation.createFromBitmap(renderScript, inBitmap,
75                     Allocation.MipmapControl.MIPMAP_NONE, Allocation.USAGE_GRAPHICS_TEXTURE);
76             output = Allocation.createFromBitmap(renderScript, outBitmap);
77 
78             blur.setRadius(BLUR_RADIUS);
79             blur.setInput(input);
80             blur.forEach(output);
81             output.copyTo(outBitmap);
82 
83             return outBitmap;
84 
85         } catch (IllegalArgumentException ex) {
86             Log.e(TAG, "error while blurring bitmap", ex);
87         } finally {
88             if (input != null) {
89                 input.destroy();
90             }
91 
92             if (output != null) {
93                 output.destroy();
94             }
95 
96             blur.destroy();
97             if (inBitmap != null) {
98                 inBitmap.recycle();
99             }
100         }
101 
102         return null;
103     }
104 }
105