CircleTransform for Picasso

CircleTransform.java

/*
 * Copyright 2014 Julian Shen
 *
 * 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 com.example.picassodemo;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;

import com.squareup.picasso.Transformation;

/**
 * Created by julian on 13/6/21.
 */
public class CircleTransform implements Transformation {
  @Override
  public Bitmap transform(Bitmap source) {
    int size = Math.min(source.getWidth(), source.getHeight());

    int x = (source.getWidth() - size) / 2;
    int y = (source.getHeight() - size) / 2;

    Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
    if (!Objects.equals(squaredBitmap, source)) {
      source.recycle();
    }

    Bitmap.Config config =
        source.getConfig() == null ? Bitmap.Config.ARGB_8888 : source.getConfig();
    Bitmap bitmap = Bitmap.createBitmap(size, size, config);

    Canvas canvas = new Canvas(bitmap);
    Paint paint = new Paint();
    BitmapShader shader =
        new BitmapShader(squaredBitmap, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
    paint.setShader(shader);
    paint.setAntiAlias(true);

    float r = size / 2f;
    canvas.drawCircle(r, r, r, paint);

    squaredBitmap.recycle();
    return bitmap;
  }

  @Override
  public String key() {
    return "circle";
  }
}

CircleTransform.kt

/*
 * Copyright 2016 Daniel Gomez Rico
 *
 * 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.
 */
 
class CircleTransform : Transformation {
    override fun key(): String? {
        return "circle";
    }

    override fun transform(source: Bitmap): Bitmap {
        val size = Math.min(source.width, source.height);

        val x = (source.width - size) / 2;
        val y = (source.height - size) / 2;

        val squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
        if (!Objects.equals(squaredBitmap, source)) {
            source.recycle();
        }

        val config = source.config ?: Bitmap.Config.ARGB_8888
        val bitmap = Bitmap.createBitmap(size, size, config);

        val canvas = Canvas(bitmap);
        val paint = Paint();
        val shader = BitmapShader(squaredBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

        paint.setShader(shader);
        paint.setAntiAlias(true);

        val r = size / 2f;
        canvas.drawCircle(r, r, r, paint);

        squaredBitmap.recycle();
        return bitmap;
    }

}