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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkLayerDrawLooper_DEFINED
#define SkLayerDrawLooper_DEFINED
#include "SkDrawLooper.h"
#include "SkPaint.h"
#include "SkPoint.h"
#include "SkBlendMode.h"
class SK_API SkLayerDrawLooper : public SkDrawLooper {
public:
~SkLayerDrawLooper() override;
/**
* Bits specifies which aspects of the layer's paint should replace the
* corresponding aspects on the draw's paint.
* kEntirePaint_Bits means use the layer's paint completely.
* 0 means ignore the layer's paint... except for fColorMode, which is
* always applied.
*/
enum Bits {
kStyle_Bit = 1 << 0, //!< use this layer's Style/stroke settings
kTextSkewX_Bit = 1 << 1, //!< use this layer's textskewx
kPathEffect_Bit = 1 << 2, //!< use this layer's patheffect
kMaskFilter_Bit = 1 << 3, //!< use this layer's maskfilter
kShader_Bit = 1 << 4, //!< use this layer's shader
kColorFilter_Bit = 1 << 5, //!< use this layer's colorfilter
kXfermode_Bit = 1 << 6, //!< use this layer's xfermode
/**
* Use the layer's paint entirely, with these exceptions:
* - We never override the draw's paint's text_encoding, since that is
* used to interpret the text/len parameters in draw[Pos]Text.
* - Color is always computed using the LayerInfo's fColorMode.
*/
kEntirePaint_Bits = -1
};
typedef int32_t BitFlags;
/**
* Info for how to apply the layer's paint and offset.
*
* fColorMode controls how we compute the final color for the layer:
* The layer's paint's color is treated as the SRC
* The draw's paint's color is treated as the DST
* final-color = Mode(layers-color, draws-color);
* Any SkBlendMode will work. Two common choices are:
* kSrc: to use the layer's color, ignoring the draw's
* kDst: to just keep the draw's color, ignoring the layer's
*/
struct SK_API LayerInfo {
BitFlags fPaintBits;
SkBlendMode fColorMode;
SkVector fOffset;
bool fPostTranslate; //!< applies to fOffset
/**
* Initial the LayerInfo. Defaults to settings that will draw the
* layer with no changes: e.g.
* fPaintBits == 0
* fColorMode == kDst_Mode
* fOffset == (0, 0)
*/
LayerInfo();
};
SkDrawLooper::Context* makeContext(SkCanvas*, SkArenaAlloc*) const override;
bool asABlurShadow(BlurShadowRec* rec) const override;
Factory getFactory() const override { return CreateProc; }
static sk_sp<SkFlattenable> CreateProc(SkReadBuffer& buffer);
protected:
sk_sp<SkDrawLooper> onMakeColorSpace(SkColorSpaceXformer*) const override;
SkLayerDrawLooper();
void flatten(SkWriteBuffer&) const override;
private:
struct Rec {
Rec* fNext;
SkPaint fPaint;
LayerInfo fInfo;
};
Rec* fRecs;
int fCount;
// state-machine during the init/next cycle
class LayerDrawLooperContext : public SkDrawLooper::Context {
public:
explicit LayerDrawLooperContext(const SkLayerDrawLooper* looper);
protected:
bool next(SkCanvas*, SkPaint* paint) override;
private:
Rec* fCurrRec;
static void ApplyInfo(SkPaint* dst, const SkPaint& src, const LayerInfo&);
};
typedef SkDrawLooper INHERITED;
public:
class SK_API Builder {
public:
Builder();
~Builder();
/**
* Call for each layer you want to add (from top to bottom).
* This returns a paint you can modify, but that ptr is only valid until
* the next call made to addLayer().
*/
SkPaint* addLayer(const LayerInfo&);
/**
* This layer will draw with the original paint, at the specified offset
*/
void addLayer(SkScalar dx, SkScalar dy);
/**
* This layer will with the original paint and no offset.
*/
void addLayer() { this->addLayer(0, 0); }
/// Similar to addLayer, but adds a layer to the top.
SkPaint* addLayerOnTop(const LayerInfo&);
/**
* Pass list of layers on to newly built looper and return it. This will
* also reset the builder, so it can be used to build another looper.
*/
sk_sp<SkDrawLooper> detach();
private:
Rec* fRecs;
Rec* fTopRec;
int fCount;
};
};
#endif
|
