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| 1 /* |
| 2 * Copyright 2015 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #ifndef SkRWBuffer_DEFINED |
| 9 #define SkRWBuffer_DEFINED |
| 10 |
| 11 #include "SkRefCnt.h" |
| 12 |
| 13 struct SkBufferBlock; |
| 14 struct SkBufferHead; |
| 15 class SkRWBuffer; |
| 16 class SkStreamAsset; |
| 17 |
| 18 /** |
| 19 * Contains a read-only, thread-sharable block of memory. To access the memory,
the caller must |
| 20 * instantiate a local iterator, as the memory is stored in 1 or more contiguou
s blocks. |
| 21 */ |
| 22 class SkROBuffer : public SkRefCnt { |
| 23 public: |
| 24 /** |
| 25 * Return the logical length of the data owned/shared by this buffer. It ma
y be stored in |
| 26 * multiple contiguous blocks, accessible via the iterator. |
| 27 */ |
| 28 size_t size() const { return fUsed; } |
| 29 |
| 30 class Iter { |
| 31 public: |
| 32 Iter(const SkROBuffer*); |
| 33 |
| 34 void reset(const SkROBuffer*); |
| 35 |
| 36 /** |
| 37 * Return the current continuous block of memory, or NULL if the iterat
or is exhausted |
| 38 */ |
| 39 const void* data() const; |
| 40 |
| 41 /** |
| 42 * Returns the number of bytes in the current continguous block of memo
ry, or 0 if the |
| 43 * iterator is exhausted. |
| 44 */ |
| 45 size_t size() const; |
| 46 |
| 47 /** |
| 48 * Advance to the next contiguous block of memory, returning true if th
ere is another |
| 49 * block, or false if the iterator is exhausted. |
| 50 */ |
| 51 bool next(); |
| 52 |
| 53 private: |
| 54 const SkBufferBlock* fBlock; |
| 55 size_t fRemaining; |
| 56 }; |
| 57 |
| 58 private: |
| 59 SkROBuffer(const SkBufferHead* head, size_t used); |
| 60 virtual ~SkROBuffer(); |
| 61 |
| 62 const SkBufferHead* fHead; |
| 63 const size_t fUsed; |
| 64 |
| 65 friend class SkRWBuffer; |
| 66 }; |
| 67 |
| 68 /** |
| 69 * Accumulates bytes of memory that are "appended" to it, growing internal stor
age as needed. |
| 70 * The growth is done such that at any time, a RBuffer or StreamAsset can be sn
apped off, which |
| 71 * can see the previously stored bytes, but which will be unaware of any future
writes. |
| 72 */ |
| 73 class SkRWBuffer { |
| 74 public: |
| 75 SkRWBuffer(size_t initialCapacity = 0); |
| 76 ~SkRWBuffer(); |
| 77 |
| 78 size_t size() const { return fTotalUsed; } |
| 79 void append(const void* buffer, size_t length); |
| 80 void* append(size_t length); |
| 81 |
| 82 SkROBuffer* newRBufferSnapshot() const; |
| 83 SkStreamAsset* newStreamSnapshot() const; |
| 84 |
| 85 #ifdef SK_DEBUG |
| 86 void validate() const; |
| 87 #else |
| 88 void validate() const {} |
| 89 #endif |
| 90 |
| 91 private: |
| 92 SkBufferHead* fHead; |
| 93 SkBufferBlock* fTail; |
| 94 size_t fTotalUsed; |
| 95 }; |
| 96 |
| 97 #endif |
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