chromium/third_party/perfetto/src/trace_processor/perfetto_sql/intrinsics/operators/slice_mipmap_operator.h

/*
 * Copyright (C) 2024 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
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#ifndef SRC_TRACE_PROCESSOR_PERFETTO_SQL_INTRINSICS_OPERATORS_SLICE_MIPMAP_OPERATOR_H_
#define SRC_TRACE_PROCESSOR_PERFETTO_SQL_INTRINSICS_OPERATORS_SLICE_MIPMAP_OPERATOR_H_

#include <sqlite3.h>
#include <cstdint>
#include <vector>

#include "src/trace_processor/containers/implicit_segment_forest.h"
#include "src/trace_processor/perfetto_sql/engine/perfetto_sql_engine.h"
#include "src/trace_processor/sqlite/bindings/sqlite_module.h"
#include "src/trace_processor/sqlite/module_lifecycle_manager.h"

namespace perfetto::trace_processor {

// Operator for building "mipmaps"  [1] over the slices in the trace.
//
// In this context mipmap really means aggregating the slices in a given
// time period by max(dur) for that period, allowing UIs to efficiently display
// the contents of slice tracks when very zoomed out.
//
// Specifically, we are computing the query:
// ```
//   select
//     depth,
//     max(dur) as dur,
//     id,
//     ts
//   from $input in
//   where in.ts_end >= $window_start and in.ts <= $window_end
//   group by depth, ts / $window_resolution
//   order by ts
// ```
// but in O(logn) time by using a segment-tree like data structure (see
// ImplicitSegmentForest).
//
// [1] https://en.wikipedia.org/wiki/Mipmap
struct SliceMipmapOperator : sqlite::Module<SliceMipmapOperator> { … };

}  // namespace perfetto::trace_processor

#endif  // SRC_TRACE_PROCESSOR_PERFETTO_SQL_INTRINSICS_OPERATORS_SLICE_MIPMAP_OPERATOR_H_