blob: 028706bc9400bfb7028ba75699029d2454277484 (
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
|
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkScaledCodec_DEFINED
#define SkScaledCodec_DEFINED
#include "SkCodec.h"
class SkStream;
/**
* This class implements scaling, by sampling scanlines in the y direction.
* x-wise sampling is implemented in the swizzler, when getScanlines() is called.
*/
class SkScaledCodec : public SkCodec {
public:
static SkCodec* NewFromStream(SkStream*);
static SkCodec* NewFromData(SkData*);
virtual ~SkScaledCodec();
static void ComputeSampleSize(const SkISize& dstDim, const SkISize& srcDim,
int* sampleSizeX, int* sampleSizeY);
protected:
bool onRewind() override;
/**
* Recommend a set of destination dimensions given a requested scale
*/
SkISize onGetScaledDimensions(float desiredScale) const override;
bool onDimensionsSupported(const SkISize&) override;
Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMColor*, int*, int*)
override;
SkEncodedFormat onGetEncodedFormat() const override {
return fCodec->getEncodedFormat();
}
bool onReallyHasAlpha() const override {
return fCodec->reallyHasAlpha();
}
uint32_t onGetFillValue(SkColorType colorType, SkAlphaType alphaType) const override;
SkScanlineOrder onGetScanlineOrder() const override;
private:
SkAutoTDelete<SkCodec> fCodec;
explicit SkScaledCodec(SkCodec*);
typedef SkCodec INHERITED;
};
#endif // SkScaledCodec_DEFINED
|
