Adding ability to set a custom blur mask filter and alphas in shadow generator. am: 665971c0

    private final Canvas mCanvas;

    private final Paint mBlurPaint;

    private final Paint mDrawPaint;

    private final BlurMaskFilter mDefaultBlurMaskFilter;

    private ShadowGenerator(Context context) {

        mIconSize = LauncherAppState.getIDP(context).iconBitmapSize;

        mCanvas = new Canvas();

        mBlurPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);

        mBlurPaint.setMaskFilter(new BlurMaskFilter(mIconSize * BLUR_FACTOR, Blur.NORMAL));

        mDrawPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);

        mDefaultBlurMaskFilter = new BlurMaskFilter(mIconSize * BLUR_FACTOR, Blur.NORMAL);

    }

    public synchronized Bitmap recreateIcon(Bitmap icon) {

        return recreateIcon(icon, true);

        return recreateIcon(icon, true, mDefaultBlurMaskFilter, AMBIENT_SHADOW_ALPHA,

                KEY_SHADOW_ALPHA);

    }

    public synchronized Bitmap recreateIcon(Bitmap icon, boolean resize) {

    public synchronized Bitmap recreateIcon(Bitmap icon, boolean resize,

            BlurMaskFilter blurMaskFilter, int ambientAlpha, int keyAlpha) {

        int width = resize ? mIconSize : icon.getWidth();

        int height = resize ? mIconSize : icon.getHeight();

        int[] offset = new int[2];

        mBlurPaint.setMaskFilter(blurMaskFilter);

        Bitmap shadow = icon.extractAlpha(mBlurPaint, offset);

        Bitmap result = Bitmap.createBitmap(width, height, Config.ARGB_8888);

        mCanvas.setBitmap(result);

        // Draw ambient shadow

        mDrawPaint.setAlpha(AMBIENT_SHADOW_ALPHA);

        mDrawPaint.setAlpha(ambientAlpha);

        mCanvas.drawBitmap(shadow, offset[0], offset[1], mDrawPaint);

        // Draw key shadow

        mDrawPaint.setAlpha(KEY_SHADOW_ALPHA);

        mDrawPaint.setAlpha(keyAlpha);

        mCanvas.drawBitmap(shadow, offset[0], offset[1] + KEY_SHADOW_DISTANCE * mIconSize, mDrawPaint);

        // Draw the icon