blob: 1750ad9d6cd59029aca960dcb92282c9f7ae8393 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPurgeableMemoryBlock_DEFINED
#define SkPurgeableMemoryBlock_DEFINED
#include "SkTypes.h"
class SkPurgeableMemoryBlock : public SkNoncopyable {
public:
/**
* Whether or not this platform has an implementation for purgeable memory.
*/
static bool IsSupported();
/**
* Create a new purgeable memory block of 'size' bytes. Returns NULL if not supported on this
* platform or on failure.
* @param size Number of bytes requested.
* @return A new block, or NULL on failure.
*/
static SkPurgeableMemoryBlock* Create(size_t size);
#ifdef SK_DEBUG
/**
* Whether the platform supports one shot purge of all unpinned blocks. If so,
* PurgeAllUnpinnedBlocks will be used to test a purge. Otherwise, purge will be called on
* individual blocks.
*/
static bool PlatformSupportsPurgingAllUnpinnedBlocks();
/**
* Purge all unpinned blocks at once, if the platform supports it.
*/
static bool PurgeAllUnpinnedBlocks();
// If PlatformSupportsPurgingAllUnpinnedBlocks returns true, this will not be called, so it can
// simply return false.
bool purge();
bool isPinned() const { return fPinned; }
#endif
~SkPurgeableMemoryBlock();
/**
* Output parameter for pin(), stating whether the data has been retained.
*/
enum PinResult {
/**
* The data has been purged, or this is the first call to pin.
*/
kUninitialized_PinResult,
/**
* The data has been retained. The memory contains the same data it held when unpin() was
* called.
*/
kRetained_PinResult,
};
/**
* Pin the memory for use. Must not be called while already pinned.
* @param PinResult Whether the data was retained. Ignored on failure.
* @return Pointer to the pinned data on success. NULL on failure.
*/
void* pin(PinResult*);
/**
* Unpin the data so it can be purged if necessary.
*/
void unpin();
private:
void* fAddr;
size_t fSize;
bool fPinned;
#ifdef SK_BUILD_FOR_ANDROID
int fFD;
#endif
// Unimplemented default constructor is private, to prevent manual creation.
SkPurgeableMemoryBlock();
// The correct way to create a new one is from the static Create.
SkPurgeableMemoryBlock(size_t);
};
#endif // SkPurgeableMemoryBlock_DEFINED
|
