PollexorRequestTransformer.java 文件源码

@Override public Request transformRequest(Request request) {
  if (request.resourceId != 0) {
    return request; // Don't transform resource requests.
  }
  Uri uri = request.uri;
  String scheme = uri.getScheme();
  if (!"https".equals(scheme) && !"http".equals(scheme)) {
    return request; // Thumbor only supports remote images.
  }
  if (!request.hasSize()) {
    return request; // Thumbor only works with resizing images.
  }

  // Start building a new request for us to mutate.
  Request.Builder newRequest = request.buildUpon();

  // Create the url builder to use.
  ThumborUrlBuilder urlBuilder = thumbor.buildImage(uri.toString());

  // Resize the image to the target size.
  urlBuilder.resize(request.targetWidth, request.targetHeight);
  newRequest.clearResize();

  // If the center inside flag is set, perform that with Thumbor as well.
  if (request.centerInside) {
    urlBuilder.fitIn();
    newRequest.clearCenterInside();
  }

  // If the Android version is modern enough use WebP for downloading.
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
    urlBuilder.filter(format(ImageFormat.WEBP));
  }

  // Update the request with the completed Thumbor URL.
  newRequest.setUri(Uri.parse(urlBuilder.toUrl()));

  return newRequest.build();
}