c8f71aa67e
Benchmarks on bullhead-userdebug show that there is a negligent performance impact when using sparse entries on a 30% loaded sparse type of 1000 resources. Benchmark Time CPU Iterations ----------------------------------------------------------------------------------- BM_SparseEntryGetResourceSparseLarge 255 ns 254 ns 2751408 BM_SparseEntryGetResourceNotSparseLarge 254 ns 254 ns 2756534 Bug: 27381711 Test: make libandroidfw_tests aapt2_tests Change-Id: I051ea22f2f6b2bc3696e446adc9e2a34be18009f
57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef AAPT_FLATTEN_TABLEFLATTENER_H
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#define AAPT_FLATTEN_TABLEFLATTENER_H
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#include "android-base/macros.h"
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#include "ResourceTable.h"
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#include "process/IResourceTableConsumer.h"
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#include "util/BigBuffer.h"
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namespace aapt {
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// The percentage of used entries for a type for which using a sparse encoding is
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// preferred.
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constexpr const size_t kSparseEncodingThreshold = 60;
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struct TableFlattenerOptions {
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// When true, types for configurations with a sparse set of entries are encoded
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// as a sparse map of entry ID and offset to actual data.
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// This is only available on platforms O+ and will only be respected when
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// minSdk is O+.
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bool use_sparse_entries = false;
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};
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class TableFlattener : public IResourceTableConsumer {
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public:
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explicit TableFlattener(const TableFlattenerOptions& options, BigBuffer* buffer)
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: options_(options), buffer_(buffer) {}
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bool Consume(IAaptContext* context, ResourceTable* table) override;
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private:
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DISALLOW_COPY_AND_ASSIGN(TableFlattener);
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TableFlattenerOptions options_;
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BigBuffer* buffer_;
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};
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} // namespace aapt
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#endif /* AAPT_FLATTEN_TABLEFLATTENER_H */
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