content: package com.allyn.lives.utils.blur;
  
  import android.content.Context;
  import android.graphics.Bitmap;
  import android.graphics.Canvas;
  import android.graphics.Paint;
  import android.os.Build;
  import android.renderscript.RSRuntimeException;
  
  import com.bumptech.glide.Glide;
  import com.bumptech.glide.load.Transformation;
  import com.bumptech.glide.load.engine.Resource;
  import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
  import com.bumptech.glide.load.resource.bitmap.BitmapResource;
  
  /**
   * Copyright (C) 2015 Wasabeef
   *
   * 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.
   */
  public class BlurTransformation implements Transformation<Bitmap> {
  
      private static int MAX_RADIUS = 25;
      private static int DEFAULT_DOWN_SAMPLING = 1;
  
      private Context mContext;
      private BitmapPool mBitmapPool;
  
      private int mRadius;
      private int mSampling;
  
      public BlurTransformation(Context context) {
          this(context, Glide.get(context).getBitmapPool(), MAX_RADIUS, DEFAULT_DOWN_SAMPLING);
      }
  
      public BlurTransformation(Context context, BitmapPool pool) {
          this(context, pool, MAX_RADIUS, DEFAULT_DOWN_SAMPLING);
      }
  
      public BlurTransformation(Context context, BitmapPool pool, int radius) {
          this(context, pool, radius, DEFAULT_DOWN_SAMPLING);
      }
  
      public BlurTransformation(Context context, int radius) {
          this(context, Glide.get(context).getBitmapPool(), radius, DEFAULT_DOWN_SAMPLING);
      }
  
      public BlurTransformation(Context context, int radius, int sampling) {
          this(context, Glide.get(context).getBitmapPool(), radius, sampling);
      }
  
      public BlurTransformation(Context context, BitmapPool pool, int radius, int sampling) {
          mContext = context.getApplicationContext();
          mBitmapPool = pool;
          mRadius = radius;
          mSampling = sampling;
      }
  
      @Override
      public Resource<Bitmap> transform(Resource<Bitmap> resource, int outWidth, int outHeight) {
          Bitmap source = resource.get();
  
          int width = source.getWidth();
          int height = source.getHeight();
          int scaledWidth = width / mSampling;
          int scaledHeight = height / mSampling;
  
          Bitmap bitmap = mBitmapPool.get(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);
          if (bitmap == null) {
              bitmap = Bitmap.createBitmap(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);
          }
  
          Canvas canvas = new Canvas(bitmap);
          canvas.scale(1 / (float) mSampling, 1 / (float) mSampling);
          Paint paint = new Paint();
          paint.setFlags(Paint.FILTER_BITMAP_FLAG);
          canvas.drawBitmap(source, 0, 0, paint);
  
          if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
              try {
                  bitmap = RSBlur.blur(mContext, bitmap, mRadius);
              } catch (RSRuntimeException e) {
                  bitmap = FastBlur.blur(bitmap, mRadius, true);
              }
          } else {
              bitmap = FastBlur.blur(bitmap, mRadius, true);
          }
  
          return BitmapResource.obtain(bitmap, mBitmapPool);
      }
  
      @Override public String getId() {
          return "BlurTransformation(radius=" + mRadius + ", sampling=" + mSampling + ")";
      }
  }
  