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 (squaredBitmap != source) {
            source.recycle();
        }

        Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());

        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";
    }
}

I've incorporated alxscms suggested change so that the script works with gif and other palletted bitmaps: https://gist.github.com/dtygel/71b77481ff9ddec26646

thnx!

I get a Null pointer @julianshen. This is the stack Trace. Thanks for the help.
java.lang.NullPointerException: Transformation circle returned null after 0 previous transformation(s).

Finally after 3 hours of wasting my time on stackoverflow, I found this! Thanks a ton!

Thank you!!!!!!

We can use shader.setLocalMatrix() method to draw circle bitmap not from source bitmap left-top. So, there is no need to create square bitmap! You can find the optimized version here: https://gist.github.com/codezjx/b8a99374385a0210edb9192bced516a3

Thank you

Thank you that's perfect !

Nice.

I'll star it

Excellent .........

how used it in main ?

Thanks @alxscms for gif config help.

Thanks @alexcms for GIF config
Exception: Attempt to read from field 'int android.graphics.Bitmap$Config.nativeInt' on a null object reference
Solution (As suggested by @alexcms) : Replace line 42 with

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

You saved my job, Thanks a lot man 👍

I need your help ! How can I custom Rounded ImageView depend radius !

Thanke you.

thanks, hero

Good stuff here, 👍

imageview has black backgound how change it to transparent

Nice!

Why it crop the image?

Try this for picasso 3: https://gist.github.com/G00fY2/f3fbc468570024930c1fd9eb4cec85a1

Thank you!!!

Cool!!!

Thanks!

On a huawei P10 Mate, applying this transformation is 5ms on average (in our case, ofc)

Thank you