1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SRC_TRACE_PROCESSOR_DB_COLUMN_OVERLAY_LAYER_H_ 18 #define SRC_TRACE_PROCESSOR_DB_COLUMN_OVERLAY_LAYER_H_ 19 20 #include <cstdint> 21 22 #include "src/trace_processor/db/column/data_layer.h" 23 24 namespace perfetto::trace_processor::column { 25 26 class OverlayLayer : public DataLayer { 27 public: 28 ~OverlayLayer() override; 29 30 // Translates the indices separtated by |stride| between |start| and |end| 31 // through this overlay. 32 // 33 // Implementations should do something like this: 34 // for (auto* it = start; it < end; it += stride) { 35 // *it = (...translate the index at *it); 36 // } 37 virtual void Flatten(uint32_t* start, 38 const uint32_t* end, 39 uint32_t stride) = 0; 40 41 protected: 42 explicit OverlayLayer(Impl impl); 43 }; 44 45 } // namespace perfetto::trace_processor::column 46 47 #endif // SRC_TRACE_PROCESSOR_DB_COLUMN_OVERLAY_LAYER_H_ 48