CircleTransformation.java

/*
 * Copyright (C) 2015 Simon Vig Therkildsen
 *
 * 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.
 */

package net.simonvt.cathode.widget;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import com.squareup.picasso.Transformation;

public class CircleTransformation implements Transformation {

  @Override public Bitmap transform(Bitmap source) {
    final int sourceWidth = source.getWidth();
    final int sourceHeight = source.getHeight();
    final int radius = Math.min(sourceWidth, sourceHeight) / 2;

    final Paint paint = new Paint();
    paint.setAntiAlias(true);
    paint.setShader(new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));

    Bitmap output = Bitmap.createBitmap(sourceWidth, sourceHeight, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(output);
    canvas.drawRoundRect(new RectF(0, 0, sourceWidth, sourceHeight), radius, radius, paint);

    if (source != output) {
      source.recycle();
    }

    return output;
  }

  @Override public String key() {
    return "circular=true";
  }
}