Fix NPE while using mLayerPaint

            } else {

                // use layer paint to draw the bitmap, merging the two alphas, but also restore

                int layerPaintAlpha = mLayerPaint != null ? mLayerPaint.getAlpha() : 255;

                if (mLayerPaint == null && alpha < 1) {

                    mLayerPaint = new Paint();

                    mLayerPaint.setAlpha((int) (alpha * layerPaintAlpha));

                }

                canvas.drawBitmap(cache, 0.0f, 0.0f, mLayerPaint);

                if (mLayerPaint != null) {

                    mLayerPaint.setAlpha(layerPaintAlpha);

                }

            }

        }

        if (restoreTo >= 0) {

            canvas.restoreToCount(restoreTo);