/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

syntax = "proto2";

package perfetto.protos;

message ChromeFrameReporter {
  enum State {
    // The frame did not have any updates to present.
    STATE_NO_UPDATE_DESIRED = 0;

    // The frame presented all the desired updates (i.e. any updates requested
    // from both the compositor thread and main-threads were handled).
    STATE_PRESENTED_ALL = 1;

    // The frame was presented with some updates, but also missed some updates
    // (e.g. missed updates from the main-thread, but included updates from the
    // compositor thread).
    STATE_PRESENTED_PARTIAL = 2;

    // The frame was dropped, i.e. some updates were desired for the frame, but
    // was not presented.
    STATE_DROPPED = 3;
  };

  optional State state = 1;

  enum FrameDropReason {
    REASON_UNSPECIFIED = 0;

    // Frame was dropped by the display-compositor.
    // The display-compositor may drop a frame some times (e.g. the frame missed
    // the deadline, or was blocked on surface-sync, etc.)
    REASON_DISPLAY_COMPOSITOR = 1;

    // Frame was dropped because of the main-thread.
    // The main-thread may cause a frame to be dropped, e.g. if the main-thread
    // is running expensive javascript, or doing a lot of layout updates, etc.
    REASON_MAIN_THREAD = 2;

    // Frame was dropped by the client compositor.
    // The client compositor can drop some frames too (e.g. attempting to
    // recover latency, missing the deadline, etc.).
    REASON_CLIENT_COMPOSITOR = 3;
  };

  // The reason is set only if |state| is not |STATE_UPDATED_ALL|.
  optional FrameDropReason reason = 2;

  optional uint64 frame_source = 3;
  optional uint64 frame_sequence = 4;

  // If this is a droped frame (i.e. if |state| is set to |STATE_DROPPED| or
  // |STATE_PRESENTED_PARTIAL|), then indicates whether this frame impacts
  // smoothness.
  optional bool affects_smoothness = 5;

  enum ScrollState {
    SCROLL_NONE = 0;
    SCROLL_MAIN_THREAD = 1;
    SCROLL_COMPOSITOR_THREAD = 2;

    // Used when it can't be determined whether a scroll is in progress or not.
    SCROLL_UNKNOWN = 3;
  }

  // The type of active scroll.
  optional ScrollState scroll_state = 6;

  // If any main thread animation is active during this frame.
  optional bool has_main_animation = 7;
  // If any compositor thread animation is active during this frame.
  optional bool has_compositor_animation = 8;
  // If any touch-driven UX (not scroll) is active during this frame.
  optional bool has_smooth_input_main = 9;

  // Whether the frame contained any missing content (i.e. whether there was
  // checkerboarding in the frame).
  optional bool has_missing_content = 10;

  // The id of layer_tree_host that the frame has been produced for.
  optional uint64 layer_tree_host_id = 11;

  // If total latency of PipelineReporter exceeds a certain limit.
  optional bool has_high_latency = 12;

  enum FrameType {
    FORKED = 0;
    BACKFILL = 1;
  }

  // Indicate if the frame is "FORKED" (i.e. a PipelineReporter event starts at
  // the same frame sequence as another PipelineReporter) or "BACKFILL"
  // (i.e. dropped frames when there are no partial compositor updates).
  optional FrameType frame_type = 13;

  // The breakdown stage of PipelineReporter that is most likely accountable for
  // high latency.
  repeated string high_latency_contribution_stage = 14;
}