open-keychain/libraries/AndroidBootstrap/src/com/beardedhen/androidbootstrap/utils/ImageUtils.java

package com.beardedhen.androidbootstrap.utils;


import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;

public class ImageUtils
{

    public static Bitmap getCircleBitmap(Bitmap bitmap)
    {
        return getCircleBitmap(bitmap, bitmap.getWidth(), bitmap.getHeight());
    }

    public static Bitmap getCircleBitmap(Bitmap bitmap, int width, int height)
    {
        Bitmap croppedBitmap = scaleCenterCrop(bitmap, width, height);
        Bitmap output = Bitmap.createBitmap(width, height, Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        final int color = 0xff424242;
        final Paint paint = new Paint();

        final Rect rect = new Rect(0, 0, width, height);
        final RectF rectF = new RectF(rect);

        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);

        int radius = 0;
        if(width > height)
        {
            radius = height / 2;
        }
        else
        {
            radius = width / 2;
        }

        canvas.drawCircle(width / 2, height / 2, radius, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(croppedBitmap, rect, rect, paint);

        return output;
    }

    public static Bitmap scaleCenterCrop(Bitmap source, int newHeight, int newWidth)
    {
        int sourceWidth = source.getWidth();
        int sourceHeight = source.getHeight();

        float xScale = (float) newWidth / sourceWidth;
        float yScale = (float) newHeight / sourceHeight;
        float scale = Math.max(xScale, yScale);

        float scaledWidth = scale * sourceWidth;
        float scaledHeight = scale * sourceHeight;

        float left = (newWidth - scaledWidth) / 2;
        float top = (newHeight - scaledHeight) / 2;

        RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);

        Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, source.getConfig());
        Canvas canvas = new Canvas(dest);
        canvas.drawBitmap(source, null, targetRect, null);

        return dest;
    }
}