a9061de9ff
Split off from https://codereview.chromium.org/940533003/ (Decrease GrInOrderDrawBuffer::Cmd's reliance on GrInOrderDrawBuffer) Review URL: https://codereview.chromium.org/967553003
79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
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/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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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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/**
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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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/**
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* Reset to 0 used bytes preserving as much memory as possible.
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* This invalidates all returned pointers.
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*/
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void rewind();
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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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size_t totalUsed() const { return fTotalUsed; }
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SkDEBUGCODE(int blockCount() const { return fBlockCount; })
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SkDEBUGCODE(size_t totalLost() const { return fTotalLost; })
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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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size_t fChunkSize;
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size_t fTotalCapacity;
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size_t fTotalUsed; // will be <= fTotalCapacity
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SkDEBUGCODE(int fBlockCount;)
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SkDEBUGCODE(size_t fTotalLost;) // will be <= fTotalCapacity
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Block* newBlock(size_t bytes, AllocFailType ftype);
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Block* addBlockIfNecessary(size_t bytes, AllocFailType ftype);
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SkDEBUGCODE(void validate();)
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};
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#endif
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