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1 #ifndef SkVarAlloc_DEFINED | 1 #ifndef SkVarAlloc_DEFINED |
2 #define SkVarAlloc_DEFINED | 2 #define SkVarAlloc_DEFINED |
3 | 3 |
4 #include "SkTypes.h" | 4 #include "SkTypes.h" |
5 | 5 |
6 class SkVarAlloc : SkNoncopyable { | 6 class SkVarAlloc : SkNoncopyable { |
7 public: | 7 public: |
8 // SkVarAlloc will never allocate less than smallest bytes at a time. | 8 SkVarAlloc(); |
9 // When it allocates a new block, it will be at least growth times bigger th
an the last. | |
10 SkVarAlloc(size_t smallest, float growth); | |
11 ~SkVarAlloc(); | 9 ~SkVarAlloc(); |
12 | 10 |
13 // Returns contiguous bytes aligned at least for pointers. You may pass SK_
MALLOC_THROW, etc. | 11 // Returns contiguous bytes aligned at least for pointers. You may pass SK_
MALLOC_THROW, etc. |
14 char* alloc(size_t bytes, unsigned sk_malloc_flags) { | 12 char* alloc(size_t bytes, unsigned sk_malloc_flags) { |
15 bytes = SkAlignPtr(bytes); | 13 bytes = SkAlignPtr(bytes); |
16 | 14 |
17 if (fByte + bytes > fLimit) { | 15 if (bytes > fRemaining) { |
18 this->makeSpace(bytes, sk_malloc_flags); | 16 this->makeSpace(bytes, sk_malloc_flags); |
19 } | 17 } |
20 SkASSERT(fByte + bytes <= fLimit); | 18 SkASSERT(bytes <= fRemaining); |
21 | 19 |
22 char* ptr = fByte; | 20 char* ptr = fByte; |
23 fByte += bytes; | 21 fByte += bytes; |
| 22 fRemaining -= bytes; |
24 return ptr; | 23 return ptr; |
25 } | 24 } |
26 | 25 |
27 private: | 26 private: |
28 void makeSpace(size_t bytes, unsigned flags); | 27 void makeSpace(size_t bytes, unsigned flags); |
29 | 28 |
30 char* fByte; | 29 char* fByte; |
31 const char* fLimit; | 30 unsigned fRemaining; |
32 | 31 unsigned fLgMinSize; |
33 unsigned fSmallest; | |
34 const float fGrowth; | |
35 | 32 |
36 struct Block; | 33 struct Block; |
37 Block* fBlock; | 34 Block* fBlock; |
38 }; | 35 }; |
39 | 36 |
40 #endif//SkVarAlloc_DEFINED | 37 #endif//SkVarAlloc_DEFINED |
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