mirror of https://github.com/axmolengine/axmol.git
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
/*
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* Copyright (C) 2006 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 SkChunkAlloc_DEFINED
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#define SkChunkAlloc_DEFINED
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#include "SkTypes.h"
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class SkChunkAlloc : SkNoncopyable {
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public:
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SkChunkAlloc(size_t minSize);
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~SkChunkAlloc();
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/** Free up all allocated blocks. This invalidates all returned
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pointers.
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*/
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void reset();
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/** Reuse all allocated blocks. This invalidates all returned
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pointers (like reset) but doesn't necessarily free up all
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of the privately allocated blocks. This is more efficient
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if you plan to reuse the allocator multiple times.
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*/
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void reuse();
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enum AllocFailType {
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kReturnNil_AllocFailType,
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kThrow_AllocFailType
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};
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void* alloc(size_t bytes, AllocFailType);
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void* allocThrow(size_t bytes) {
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return this->alloc(bytes, kThrow_AllocFailType);
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}
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/** Call this to unalloc the most-recently allocated ptr by alloc(). On
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success, the number of bytes freed is returned, or 0 if the block could
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not be unallocated. This is a hint to the underlying allocator that
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the previous allocation may be reused, but the implementation is free
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to ignore this call (and return 0).
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*/
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size_t unalloc(void* ptr);
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size_t totalCapacity() const { return fTotalCapacity; }
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/**
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* Returns true if the specified address is within one of the chunks, and
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* has at least 1-byte following the address (i.e. if addr points to the
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* end of a chunk, then contains() will return false).
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*/
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bool contains(const void* addr) const;
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private:
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struct Block;
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Block* fBlock;
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size_t fMinSize;
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Block* fPool;
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size_t fTotalCapacity;
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Block* newBlock(size_t bytes, AllocFailType ftype);
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};
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#endif
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