894f132ba0
Revert "libui: rewrite Region with FatVector" Revert submission 10248126-fatvector-region Reason for revert: b/149254345 Reverted Changes: I09dc2fddd:hwui: remove FatVector I265c6c831:libui: rewrite Region with FatVector also fix wrong license in FatVector.h Test: boots Bug: 149254345 Change-Id: I8ac66acb8b635324051edd41c5d4092c223157ff
97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
/*
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* Copyright 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 ANDROID_FAT_VECTOR_H
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#define ANDROID_FAT_VECTOR_H
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#include "utils/Macros.h"
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#include <stddef.h>
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#include <stdlib.h>
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#include <utils/Log.h>
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#include <type_traits>
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#include <vector>
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namespace android {
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namespace uirenderer {
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template <typename T, size_t SIZE>
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class InlineStdAllocator {
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public:
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struct Allocation {
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PREVENT_COPY_AND_ASSIGN(Allocation);
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public:
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Allocation(){};
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// char array instead of T array, so memory is uninitialized, with no destructors run
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char array[sizeof(T) * SIZE];
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bool inUse = false;
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};
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typedef T value_type; // needed to implement std::allocator
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typedef T* pointer; // needed to implement std::allocator
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explicit InlineStdAllocator(Allocation& allocation) : mAllocation(allocation) {}
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InlineStdAllocator(const InlineStdAllocator& other) : mAllocation(other.mAllocation) {}
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~InlineStdAllocator() {}
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T* allocate(size_t num, const void* = 0) {
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if (!mAllocation.inUse && num <= SIZE) {
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mAllocation.inUse = true;
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return (T*)mAllocation.array;
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} else {
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return (T*)malloc(num * sizeof(T));
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}
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}
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void deallocate(pointer p, size_t num) {
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if (p == (T*)mAllocation.array) {
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mAllocation.inUse = false;
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} else {
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// 'free' instead of delete here - destruction handled separately
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free(p);
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}
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}
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Allocation& mAllocation;
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};
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/**
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* std::vector with SIZE elements preallocated into an internal buffer.
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*
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* Useful for avoiding the cost of malloc in cases where only SIZE or
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* fewer elements are needed in the common case.
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*/
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template <typename T, size_t SIZE>
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class FatVector : public std::vector<T, InlineStdAllocator<T, SIZE>> {
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public:
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FatVector()
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: std::vector<T, InlineStdAllocator<T, SIZE>>(
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InlineStdAllocator<T, SIZE>(mAllocation)) {
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this->reserve(SIZE);
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}
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explicit FatVector(size_t capacity) : FatVector() { this->resize(capacity); }
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private:
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typename InlineStdAllocator<T, SIZE>::Allocation mAllocation;
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};
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} // namespace uirenderer
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} // namespace android
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#endif // ANDROID_FAT_VECTOR_H
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