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.RectF;
  
  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;
  
  public class CropTransformation implements Transformation<Bitmap> {
  
    public enum CropType {
      TOP,
      CENTER,
      BOTTOM
    }
  
    private BitmapPool mBitmapPool;
    private int mWidth;
    private int mHeight;
  
    private CropType mCropType = CropType.CENTER;
  
    public CropTransformation(Context context) {
      this(Glide.get(context).getBitmapPool());
    }
  
    public CropTransformation(BitmapPool pool) {
      this(pool, 0, 0);
    }
  
    public CropTransformation(Context context, int width, int height) {
      this(Glide.get(context).getBitmapPool(), width, height);
    }
  
    public CropTransformation(BitmapPool pool, int width, int height) {
      this(pool, width, height, CropType.CENTER);
    }
  
    public CropTransformation(Context context, int width, int height, CropType cropType) {
      this(Glide.get(context).getBitmapPool(), width, height, cropType);
    }
  
    public CropTransformation(BitmapPool pool, int width, int height, CropType cropType) {
      mBitmapPool = pool;
      mWidth = width;
      mHeight = height;
      mCropType = cropType;
    }
  
    @Override
    public Resource<Bitmap> transform(Resource<Bitmap> resource, int outWidth, int outHeight) {
      Bitmap source = resource.get();
      mWidth = mWidth == 0 ? source.getWidth() : mWidth;
      mHeight = mHeight == 0 ? source.getHeight() : mHeight;
  
      Bitmap.Config config =
          source.getConfig() != null ? source.getConfig() : Bitmap.Config.ARGB_8888;
      Bitmap bitmap = mBitmapPool.get(mWidth, mHeight, config);
      if (bitmap == null) {
        bitmap = Bitmap.createBitmap(mWidth, mHeight, config);
      }
  
      float scaleX = (float) mWidth / source.getWidth();
      float scaleY = (float) mHeight / source.getHeight();
      float scale = Math.max(scaleX, scaleY);
  
      float scaledWidth = scale * source.getWidth();
      float scaledHeight = scale * source.getHeight();
      float left = (mWidth - scaledWidth) / 2;
      float top = getTop(scaledHeight);
      RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);
  
      Canvas canvas = new Canvas(bitmap);
      canvas.drawBitmap(source, null, targetRect, null);
  
      return BitmapResource.obtain(bitmap, mBitmapPool);
    }
  
    @Override public String getId() {
      return "CropTransformation(width=" + mWidth + ", height=" + mHeight + ", cropType=" + mCropType
          + ")";
    }
  
    private float getTop(float scaledHeight) {
      switch (mCropType) {
        case TOP:
          return 0;
        case CENTER:
          return (mHeight - scaledHeight) / 2;
        case BOTTOM:
          return mHeight - scaledHeight;
        default:
          return 0;
      }
    }
  }
  