fresco 加载本地路径图片，并修改图片尺寸

只是为了记下来，怕以后忘了。

int width =100;//目标宽度
Postprocessor postprocessor = new Postprocessor() {
    @Override    public CloseableReference<Bitmap> process(Bitmap sourceBitmap, PlatformBitmapFactory bitmapFactory) {    

    int sw = sourceBitmap.getWidth();     

   int sh = sourceBitmap.getHeight();     

   float scale = (float) width / (float) sw;    

    int mscale = sw / width;       

 float heigh = scale * (float) sh;      

  int nscale = sh / (int) heigh;     

   CloseableReference<Bitmap> bitmapRef = bitmapFactory.createBitmap(                width,                (int) heigh);