Adjusting rotation and scale of the camera

CameraBridgeViewBase.java

    protected void deliverAndDrawFrame(CvCameraViewFrame frame) {
        Mat modified;

        if (mListener != null) {
            modified = mListener.onCameraFrame(frame);
        } else {
            modified = frame.rgba();
        }

        boolean bmpValid = true;
        if (modified != null) {
            try {
                Utils.matToBitmap(modified, mCacheBitmap);
            } catch(Exception e) {
                Log.e(TAG, "Mat type: " + modified);
                Log.e(TAG, "Bitmap type: " + mCacheBitmap.getWidth() + "*" + mCacheBitmap.getHeight());
                Log.e(TAG, "Utils.matToBitmap() throws an exception: " + e.getMessage());
                bmpValid = false;
            }
        }

        if (bmpValid && mCacheBitmap != null) {
            Canvas canvas = getHolder().lockCanvas();
            if (canvas != null) {
                canvas.drawColor(0, android.graphics.PorterDuff.Mode.CLEAR);
                if (BuildConfig.DEBUG)
                    Log.d(TAG, "mStretch value: " + mScale);
// rotation part
                canvas.save();
                canvas.rotate(90,  (canvas.getWidth()/2),(canvas.getHeight()/2));
                mScale = 1.7f;
// rotation part ended

                if (mScale != 0) {
                    canvas.drawBitmap(mCacheBitmap, new Rect(0,0,mCacheBitmap.getWidth(), mCacheBitmap.getHeight()),
                         new Rect((int)((canvas.getWidth() - mScale*mCacheBitmap.getWidth()) / 2),
                         (int)((canvas.getHeight() - mScale*mCacheBitmap.getHeight()) / 2),
                         (int)((canvas.getWidth() - mScale*mCacheBitmap.getWidth()) / 2 + mScale*mCacheBitmap.getWidth()),
                         (int)((canvas.getHeight() - mScale*mCacheBitmap.getHeight()) / 2 + mScale*mCacheBitmap.getHeight())), null);
                } else {
                     canvas.drawBitmap(mCacheBitmap, new Rect(0,0,mCacheBitmap.getWidth(), mCacheBitmap.getHeight()),
                         new Rect((canvas.getWidth() - mCacheBitmap.getWidth()) / 2,
                         (canvas.getHeight() - mCacheBitmap.getHeight()) / 2,
                         (canvas.getWidth() - mCacheBitmap.getWidth()) / 2 + mCacheBitmap.getWidth(),
                         (canvas.getHeight() - mCacheBitmap.getHeight()) / 2 + mCacheBitmap.getHeight()), null);
                }

                if (mFpsMeter != null) {
                    mFpsMeter.measure();
                    mFpsMeter.draw(canvas, 20, 30);
                }

// for the rotation part
                canvas.restore();
// for the rotation part ended

                getHolder().unlockCanvasAndPost(canvas);
            }
        }
    }