blob: 1057441d5e4b1d7d5053c25f2696238687d33ee7 (
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
|
/*
* 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 SkCachingPixelRef_DEFINED
#define SkCachingPixelRef_DEFINED
#include "SkBitmapCache.h"
#include "SkImageInfo.h"
#include "SkImageGenerator.h"
#include "SkPixelRef.h"
class SkColorTable;
/**
* PixelRef which defers decoding until SkBitmap::lockPixels() is
* called. Caches the decoded images in the global
* SkScaledImageCache. When the pixels are unlocked, this cache may
* or be destroyed before the next lock. If so, onLockPixels will
* attempt to re-decode.
*
* Decoding is handled by the SkImageGenerator
*/
class SkCachingPixelRef : public SkPixelRef {
public:
/**
* Takes ownership of SkImageGenerator. If this method fails for
* whatever reason, it will return false and immediatetely delete
* the generator. If it succeeds, it will modify destination
* bitmap.
*
* If Install fails or when the SkCachingPixelRef that is
* installed into destination is destroyed, it will call
* `delete` on the generator. Therefore, generator should be
* allocated with `new`.
*/
static bool Install(SkImageGenerator* gen, SkBitmap* dst);
protected:
virtual ~SkCachingPixelRef();
bool onNewLockPixels(LockRec*) override;
void onUnlockPixels() override;
bool onLockPixelsAreWritable() const override { return false; }
SkData* onRefEncodedData() override {
return fImageGenerator->refEncodedData();
}
bool onIsLazyGenerated() const override { return true; }
private:
SkImageGenerator* const fImageGenerator;
bool fErrorInDecoding;
const size_t fRowBytes;
SkBitmap fLockedBitmap;
SkCachingPixelRef(const SkImageInfo&, SkImageGenerator*, size_t rowBytes);
typedef SkPixelRef INHERITED;
};
#endif // SkCachingPixelRef_DEFINED
|
