boost performance for opencv camera

PortaitCameraBridgeViewBase.java

// Around line 435, replace the block with this code

if (bmpValid && mCacheBitmap != null) {
   Canvas canvas = getHolder().lockCanvas();
   if (canvas != null)
   {
       canvas.rotate(90f, canvas.getWidth()/2, canvas.getHeight()/2);
       canvas.drawColor(0, android.graphics.PorterDuff.Mode.CLEAR);
 
       //Log.d(TAG, String.format("scale: %f, canvas width x height: %d x %d, bitmap width x height:%d x %d ", mScale, canvas.getWidth(), canvas.getHeight(), mCacheBitmap.getWidth(), mCacheBitmap.getHeight()));
 
       Rect dstRect = new Rect();
       canvas.getClipBounds(dstRect);
       canvas.drawBitmap(mCacheBitmap,
               new Rect(0, 0, mCacheBitmap.getWidth(), mCacheBitmap.getHeight()),
               dstRect,
               null);
 
       if (mFpsMeter != null)
       {
           mFpsMeter.measure();
           mFpsMeter.draw(canvas, 20, 30);
       }
       getHolder().unlockCanvasAndPost(canvas);
   }