OLD | NEW |
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(); | 8 // Smallest block we'll allocate is 2**N bytes. |
| 9 explicit SkVarAlloc(size_t minLgSize); |
9 ~SkVarAlloc(); | 10 ~SkVarAlloc(); |
10 | 11 |
11 // Returns contiguous bytes aligned at least for pointers. You may pass SK_
MALLOC_THROW, etc. | 12 // Returns contiguous bytes aligned at least for pointers. You may pass SK_
MALLOC_THROW, etc. |
12 char* alloc(size_t bytes, unsigned sk_malloc_flags) { | 13 char* alloc(size_t bytes, unsigned sk_malloc_flags) { |
13 bytes = SkAlignPtr(bytes); | 14 bytes = SkAlignPtr(bytes); |
14 | 15 |
15 if (bytes > fRemaining) { | 16 if (bytes > fRemaining) { |
16 this->makeSpace(bytes, sk_malloc_flags); | 17 this->makeSpace(bytes, sk_malloc_flags); |
17 } | 18 } |
18 SkASSERT(bytes <= fRemaining); | 19 SkASSERT(bytes <= fRemaining); |
19 | 20 |
20 char* ptr = fByte; | 21 char* ptr = fByte; |
21 fByte += bytes; | 22 fByte += bytes; |
22 fRemaining -= bytes; | 23 fRemaining -= bytes; |
23 return ptr; | 24 return ptr; |
24 } | 25 } |
25 | 26 |
26 // Returns our best estimate of the number of bytes we've allocated. | 27 // Returns our best estimate of the number of bytes we've allocated. |
27 // (We intentionally do not track this precisely to save space.) | 28 // (We intentionally do not track this precisely to save space.) |
28 size_t approxBytesAllocated() const; | 29 size_t approxBytesAllocated() const; |
29 | 30 |
30 private: | 31 private: |
31 void makeSpace(size_t bytes, unsigned flags); | 32 void makeSpace(size_t bytes, unsigned flags); |
32 | 33 |
33 char* fByte; | 34 char* fByte; |
34 unsigned fRemaining; | 35 unsigned fRemaining; |
35 unsigned fLgSize; // This is always in the range [4, 16], so it really only
needs 4 bits. | 36 unsigned fLgSize; |
36 | 37 |
37 struct Block; | 38 struct Block; |
38 Block* fBlock; | 39 Block* fBlock; |
39 }; | 40 }; |
40 SK_COMPILE_ASSERT(sizeof(SkVarAlloc) <= 24, SkVarAllocSize); | 41 SK_COMPILE_ASSERT(sizeof(SkVarAlloc) <= 24, SkVarAllocSize); |
41 | 42 |
42 #endif//SkVarAlloc_DEFINED | 43 #endif//SkVarAlloc_DEFINED |
OLD | NEW |