android 绘制在路径（Path）剪切中的平铺图像

public static Bitmap TileClipPath(Bitmap src,Path path,int w,int h)
    {
        BitmapDrawable drawable = new BitmapDrawable(src);
        drawable.setTileModeXY(TileMode.REPEAT , TileMode.REPEAT );
        drawable.setDither(true);
        
        Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
                : Bitmap.Config.RGB_565;
        Bitmap bitmap = Bitmap.createBitmap(w, h, config);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, w, h);
        drawable.draw(canvas);
        
        Bitmap outbitmap = Bitmap.createBitmap(w, h, config);
        Canvas outcanvas = new Canvas(outbitmap);
        
        outcanvas.drawARGB(0, 0, 0, 0);
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setColor(0xff424242);
        outcanvas.drawPath(path, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        outcanvas.drawBitmap(bitmap, 0, 0, paint);
        
        return outbitmap;
    }