content: package com.github.airsaid.accountbook.widget.transform;
  
  /**
   * 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.
   */
  
  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;
  import com.github.airsaid.accountbook.widget.transform.internal.FastBlur;
  import com.github.airsaid.accountbook.widget.transform.internal.RSBlur;
  
  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_MR2) {
        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 + ")";
    }
  }
  