content: package com.aishang5wpj.juhenews.glide;
  
  import android.content.Context;
  import android.content.res.Resources;
  import android.graphics.Bitmap;
  import android.graphics.BitmapShader;
  import android.graphics.Canvas;
  import android.graphics.Paint;
  import android.graphics.RectF;
  
  import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
  import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
  
  /**
   * 图片转圆角
   */
  public class GlideRoundTransform extends BitmapTransformation {
  
      private static float radius = 0f;
  
      public GlideRoundTransform(Context context) {
          this(context, 4);
      }
  
      public GlideRoundTransform(Context context, int dp) {
          super(context);
          this.radius = Resources.getSystem().getDisplayMetrics().density * dp;
      }
  
      private static Bitmap roundCrop(BitmapPool pool, Bitmap source) {
          if (source == null) return null;
  
          Bitmap result = pool.get(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
          if (result == null) {
              result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
          }
  
          Canvas canvas = new Canvas(result);
          Paint paint = new Paint();
          paint.setShader(new BitmapShader(source, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
          paint.setAntiAlias(true);
          RectF rectF = new RectF(0f, 0f, source.getWidth(), source.getHeight());
          canvas.drawRoundRect(rectF, radius, radius, paint);
          return result;
      }
  
      @Override
      protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
          return roundCrop(pool, toTransform);
      }
  
      @Override
      public String getId() {
          return getClass().getName() + Math.round(radius);
      }
  }