// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module gfx.mojom;

import "ui/gfx/mojom/delegated_ink_point.mojom";

// This interface is used to connect the browser process to viz to support
// delegated ink trails. A delegated ink point will be produced in the
// browser process and sent to viz to be held until DrawAndSwap occurs, at
// which point any delegated ink points that arrived may be used to draw the
// ink trail. When the browser detects the end of the trail, it will call
// ResetPrediction() so that viz does not predict any points further than what
// the user is expecting.
[DirectReceiver]
interface DelegatedInkPointRenderer {
  // Used to send the DelegatedInkPoint that was created in the browser process
  // to viz in order to be drawn as part of the delegated ink trail.
  StoreDelegatedInkPoint(DelegatedInkPoint point);

  // Used to reset prediction and prediction metrics that have been generated
  // by previously received points. Used by the browser process when a delegated
  // ink trail should end.
  ResetPrediction();
};