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A picasso circle image transformation. Optimized version of: https://gist.github.com/julianshen/5829333. Use shader.setLocalMatrix() method to draw circle bitmap not from source bitmap left-top. So, we no need to create square bitmap!
/**
* Created by codezjx on 2016/5/4.
*/
public class CircleImageTransformation implements Transformation {
/**
* A unique key for the transformation, used for caching purposes.
*/
private static final String KEY = "circleImageTransformation";
@Override
public Bitmap transform(Bitmap source) {
int minEdge = Math.min(source.getWidth(), source.getHeight());
int dx = (source.getWidth() - minEdge) / 2;
int dy = (source.getHeight() - minEdge) / 2;
// Init shader
Shader shader = new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
Matrix matrix = new Matrix();
matrix.setTranslate(-dx, -dy); // Move the target area to center of the source bitmap
shader.setLocalMatrix(matrix);
// Init paint
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setShader(shader);
// Create and draw circle bitmap
Bitmap output = Bitmap.createBitmap(minEdge, minEdge, source.getConfig());
Canvas canvas = new Canvas(output);
canvas.drawOval(new RectF(0, 0, minEdge, minEdge), paint);
// Recycle the source bitmap, because we already generate a new one
source.recycle();
return output;
}
@Override
public String key() {
return KEY;
}
}
@fbencosme

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commented Jul 14, 2016

Awesome!

@pladaria

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commented Nov 27, 2016

Thank you!

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