android bitmap slicer

ImageUtil.java

package abdularis.github.com.slidingpuzzle;

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

/**
 * Created by abdularis on 29/12/17.
 */

public final class ImageUtil {

    public static Bitmap[] sliceBitmap(Bitmap original, int rowCount, int colCount) {
        Bitmap pieces[] = new Bitmap[rowCount * colCount];
        Canvas canvas = new Canvas();
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

        int pieceWidth = original.getWidth() / colCount;
        int pieceHeight = original.getHeight() / rowCount;
        int currPieceIndex = 0;

        Rect srcRect = new Rect();
        Rect dstRect = new Rect(0, 0, pieceWidth, pieceHeight);
        for (int row = 0; row < rowCount; row++) {
            for (int col = 0; col < colCount; col++) {
                Bitmap currPiece = Bitmap.createBitmap(pieceWidth, pieceHeight, Bitmap.Config.ARGB_8888);

                srcRect.left = pieceWidth * col;
                srcRect.top = pieceHeight * row;
                srcRect.right = srcRect.left + pieceWidth;
                srcRect.bottom = srcRect.top + pieceHeight;

                canvas.setBitmap(currPiece);
                canvas.drawBitmap(original, srcRect, dstRect, paint);

                pieces[currPieceIndex++] = currPiece;
            }
        }

        return pieces;
    }

}