aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/core/SkAutoPixmapStorage.h
blob: 379bf420b0ba9a37fa789d8808f72bd807fd325b (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
/*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkAutoPixmapStorage_DEFINED
#define SkAutoPixmapStorage_DEFINED

#include "SkPixmap.h"

class SK_API SkAutoPixmapStorage : public SkPixmap {
public:
    SkAutoPixmapStorage();
    ~SkAutoPixmapStorage();

    /**
    *  Try to allocate memory for the pixels needed to match the specified Info. On success
    *  return true and fill out the pixmap to point to that memory. The storage will be freed
    *  when this object is destroyed, or if another call to tryAlloc() or alloc() is made.
    *
    *  On failure, return false and reset() the pixmap to empty.
    */
    bool tryAlloc(const SkImageInfo&);

    /**
    *  Allocate memory for the pixels needed to match the specified Info and fill out the pixmap
    *  to point to that memory. The storage will be freed when this object is destroyed,
    *  or if another call to tryAlloc() or alloc() is made.
    *
    *  If the memory cannot be allocated, calls sk_throw().
    */
    void alloc(const SkImageInfo&);

    /**
    * Gets the size and optionally the rowBytes that would be allocated by SkAutoPixmapStorage if
    * alloc/tryAlloc was called.
    */
    static size_t AllocSize(const SkImageInfo& info, size_t* rowBytes);

    /**
    *  Returns an SkData object wrapping the allocated pixels memory, and resets the pixmap.
    *  If the storage hasn't been allocated, the result is NULL.
    */
    const SkData* SK_WARN_UNUSED_RESULT detachPixelsAsData();

    // We wrap these so we can clear our internal storage

    void reset() {
        this->freeStorage();
        this->INHERITED::reset();
    }
    void reset(const SkImageInfo& info, const void* addr, size_t rb, SkColorTable* ctable = NULL) {
        this->freeStorage();
        this->INHERITED::reset(info, addr, rb, ctable);
    }
    void reset(const SkImageInfo& info) {
        this->freeStorage();
        this->INHERITED::reset(info);
    }
    bool SK_WARN_UNUSED_RESULT reset(const SkMask& mask) {
        this->freeStorage();
        return this->INHERITED::reset(mask);
    }

private:
    void*   fStorage;

    void freeStorage() {
        sk_free(fStorage);
        fStorage = nullptr;
    }

    typedef SkPixmap INHERITED;
};

#endif