android blur

blur.java

    private Bitmap blur(Bitmap sentBitmap, Context context) {
        Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);

        final RenderScript rs = RenderScript.create(context);
        final Allocation input = Allocation.createFromBitmap(rs, sentBitmap, Allocation.MipmapControl.MIPMAP_NONE,
                Allocation.USAGE_SCRIPT);
        final Allocation output = Allocation.createTyped(rs, input.getType());
        final ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
        script.setRadius(10.f /* e.g. 3.f */);
        script.setInput(input);
        script.forEach(output);
        output.copyTo(bitmap);
        sentBitmap.recycle();
        return bitmap;
    }

    // called from PanelView when self-expanding, too
    public void startOpeningPanel(PanelView panel) {
        if (DEBUG) LOG("startOpeningPanel: " + panel);
        mTouchingPanel = panel;
        mPanelHolder.setSelectedPanel(mTouchingPanel);
        for (PanelView pv : mPanels) {
            if (pv != panel) {
                pv.collapse();
            }
        }

        WindowManager wm = (WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE);
        Display display = wm.getDefaultDisplay();

        Bitmap screenBitmap = SurfaceControl.screenshot(1920 /10, 1080 /10);

        Matrix matrix = new Matrix();
        int rDegree = 0;
        switch (display.getRotation()) {
            case Surface.ROTATION_0:
                rDegree = 0;
                break;
            case Surface.ROTATION_90:
                rDegree = 270;
                break;
            case Surface.ROTATION_180:
                rDegree = 180;
                break;
            case Surface.ROTATION_270:
                rDegree = 90;
                break;
        }
        matrix.postRotate(rDegree);

        Bitmap rotate = Bitmap.createBitmap(screenBitmap , 0, 0,
                screenBitmap.getWidth(), screenBitmap.getHeight(), matrix, true);
        
        mTouchingPanel.setBackgroundBitmap(blur(rotate, mContext));
    }