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
|
/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkBlurMaskFilter_DEFINED
#define SkBlurMaskFilter_DEFINED
// we include this since our callers will need to at least be able to ref/unref
#include "SkMaskFilter.h"
#include "SkScalar.h"
#include "SkBlurTypes.h"
class SK_API SkBlurMaskFilter {
public:
/**
* If radius > 0, return the corresponding sigma, else return 0. Use this to convert from the
* (legacy) idea of specify the blur "radius" to the standard notion of specifying its sigma.
*/
static SkScalar ConvertRadiusToSigma(SkScalar radius);
enum BlurFlags {
kNone_BlurFlag = 0x00,
/** The blur layer's radius is not affected by transforms */
kIgnoreTransform_BlurFlag = 0x01,
/** Use a smother, higher qulity blur algorithm */
kHighQuality_BlurFlag = 0x02,
/** mask for all blur flags */
kAll_BlurFlag = 0x03
};
/** Create a blur maskfilter.
* @param style The SkBlurStyle to use
* @param sigma Standard deviation of the Gaussian blur to apply. Must be > 0.
* @param occluder The rect for which no pixels need be drawn (b.c. it will be overdrawn
* with some opaque object. This is just a hint which backends are free to
* ignore.
* @param flags Flags to use - defaults to none
* @return The new blur maskfilter
*/
static sk_sp<SkMaskFilter> Make(SkBlurStyle style, SkScalar sigma,
const SkRect& occluder, uint32_t flags = kNone_BlurFlag);
static sk_sp<SkMaskFilter> Make(SkBlurStyle style, SkScalar sigma,
uint32_t flags = kNone_BlurFlag) {
return Make(style, sigma, SkRect::MakeEmpty(), flags);
}
static const int kMaxDivisions = 6;
// This method computes all the parameters for drawing a partially occluded nine-patched
// blurred rrect mask:
// rrectToDraw - the integerized rrect to draw in the mask
// widthHeight - how large to make the mask (rrectToDraw will be centered in this coord sys)
// rectXs, rectYs - the x & y coordinates of the covering geometry lattice
// texXs, texYs - the texture coordinate at each point in rectXs & rectYs
// numXs, numYs - number of coordinates in the x & y directions
// skipMask - bit mask that contains a 1-bit whenever one of the cells is occluded
// It returns true if 'devRRect' is nine-patchable
static bool ComputeBlurredRRectParams(const SkRRect& srcRRect, const SkRRect& devRRect,
const SkRect& occluder,
SkScalar sigma, SkScalar xformedSigma,
SkRRect* rrectToDraw,
SkISize* widthHeight,
SkScalar rectXs[kMaxDivisions],
SkScalar rectYs[kMaxDivisions],
SkScalar texXs[kMaxDivisions],
SkScalar texYs[kMaxDivisions],
int* numXs, int* numYs, uint32_t* skipMask);
SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
private:
SkBlurMaskFilter(); // can't be instantiated
};
#endif
|
