Android RenderScript高斯模糊

public static Bitmap blurBitmap(Bitmap bitmap, float radius, Context context) {     //创建渲染脚本上下文     RenderScript rs = RenderScript.create(context);      //为位图分配内存     Allocation allocation = Allocation.createFromBitmap(rs, bitmap);      Type t = allocation.getType();      //用同样的类型创建内存，一般用这两种方式创建 <span style="font-family: Arial, Helvetica, sans-serif;">Allocation</span>     Allocation blurredAllocation = Allocation.createTyped(rs, t);      //创建高斯渲染脚本      ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));     //设置模糊半径 (maximum 25.0)     blurScript.setRadius(radius);     //为脚本设置输入参数      blurScript.setInput(allocation);     //调用脚本 结果存入 <span style="font-family: Arial, Helvetica, sans-serif;">blurredAllocation中</span>     blurScript.forEach(blurredAllocation);      //把脚本结果存入位图中 因为为native层渲染，所以结果需要复制到上层     blurredAllocation.copyTo(bitmap);      //Destroy everything to free memory     allocation.destroy();     blurredAllocation.destroy();     blurScript.destroy();     t.destroy();      return bitmap;   }