af0ba653bf
Necessary for crrev.com/1812273003 in Chromium. Also remove trailing whitespace. GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1856033002 Review URL: https://codereview.chromium.org/1856033002
98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
/*
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* Copyright 2015 Google Inc.
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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 SkRWBuffer_DEFINED
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#define SkRWBuffer_DEFINED
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#include "SkRefCnt.h"
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struct SkBufferBlock;
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struct SkBufferHead;
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class SkRWBuffer;
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class SkStreamAsset;
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/**
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* Contains a read-only, thread-sharable block of memory. To access the memory, the caller must
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* instantiate a local iterator, as the memory is stored in 1 or more contiguous blocks.
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*/
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class SK_API SkROBuffer : public SkRefCnt {
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public:
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/**
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* Return the logical length of the data owned/shared by this buffer. It may be stored in
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* multiple contiguous blocks, accessible via the iterator.
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*/
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size_t size() const { return fUsed; }
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class SK_API Iter {
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public:
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Iter(const SkROBuffer*);
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void reset(const SkROBuffer*);
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/**
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* Return the current continuous block of memory, or nullptr if the iterator is exhausted
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*/
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const void* data() const;
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/**
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* Returns the number of bytes in the current continguous block of memory, or 0 if the
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* iterator is exhausted.
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*/
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size_t size() const;
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/**
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* Advance to the next contiguous block of memory, returning true if there is another
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* block, or false if the iterator is exhausted.
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*/
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bool next();
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private:
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const SkBufferBlock* fBlock;
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size_t fRemaining;
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};
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private:
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SkROBuffer(const SkBufferHead* head, size_t used);
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virtual ~SkROBuffer();
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const SkBufferHead* fHead;
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const size_t fUsed;
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friend class SkRWBuffer;
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};
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/**
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* Accumulates bytes of memory that are "appended" to it, growing internal storage as needed.
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* The growth is done such that at any time, a RBuffer or StreamAsset can be snapped off, which
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* can see the previously stored bytes, but which will be unaware of any future writes.
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*/
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class SK_API SkRWBuffer {
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public:
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SkRWBuffer(size_t initialCapacity = 0);
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~SkRWBuffer();
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size_t size() const { return fTotalUsed; }
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void append(const void* buffer, size_t length);
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void* append(size_t length);
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SkROBuffer* newRBufferSnapshot() const;
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SkStreamAsset* newStreamSnapshot() const;
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#ifdef SK_DEBUG
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void validate() const;
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#else
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void validate() const {}
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#endif
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private:
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SkBufferHead* fHead;
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SkBufferBlock* fTail;
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size_t fTotalUsed;
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};
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#endif
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