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1 /* | |
2 * Copyright 2016 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 | |
9 #ifndef GrStencilSettings_DEFINED | |
10 #define GrStencilSettings_DEFINED | |
11 | |
12 #include "GrUserStencilSettings.h" | |
13 #include "SkRegion.h" | |
14 | |
15 class GrProcessorKeyBuilder; | |
16 | |
17 enum class GrStencilTest : uint16_t { | |
18 kAlways, | |
19 kNever, | |
20 kGreater, | |
21 kGEqual, | |
22 kLess, | |
23 kLEqual, | |
24 kEqual, | |
25 kNotEqual | |
26 }; | |
27 static constexpr int kGrStencilTestCount = 1 + (int)GrStencilTest::kNotEqual; | |
28 | |
29 enum class GrStencilOp : uint8_t { | |
30 kKeep, | |
31 kZero, | |
32 kReplace, // Replace stencil value with fRef (only the bits enabled in fWrit
eMask). | |
33 kInvert, | |
34 kIncWrap, | |
35 kDecWrap, | |
36 // NOTE: clamping occurs before the write mask. So if the MSB is zero and ma
sked out, stencil | |
37 // values will still wrap when using clamping ops. | |
38 kIncClamp, | |
39 kDecClamp | |
40 }; | |
41 static constexpr int kGrStencilOpCount = 1 + (int)GrStencilOp::kDecClamp; | |
42 | |
43 /** | |
44 * This class defines concrete stencil settings that map directly to the underly
ing hardware. It | |
45 * is deduced from user stencil settings, stencil clip status, and the number of
bits in the | |
46 * target stencil buffer. | |
47 */ | |
48 class GrStencilSettings { | |
49 public: | |
50 GrStencilSettings() { this->setDisabled(); } | |
51 GrStencilSettings(const GrUserStencilSettings& user, bool hasStencilClip, in
t numStencilBits) { | |
52 this->reset(user, hasStencilClip, numStencilBits); | |
53 } | |
54 GrStencilSettings(const GrStencilSettings& that) { this->reset(that); } | |
55 GrStencilSettings& operator=(const GrStencilSettings& that) { this->reset(th
at); return *this; } | |
56 | |
57 void invalidate() { fFlags |= kInvalid_PrivateFlag; } | |
58 void setDisabled() { fFlags = kAll_StencilFlags; } | |
59 void reset(const GrUserStencilSettings&, bool hasStencilClip, int numStencil
Bits); | |
60 void reset(const GrStencilSettings&); | |
61 | |
62 bool isValid() const { return !(fFlags & kInvalid_PrivateFlag); } | |
63 bool isDisabled() const { SkASSERT(this->isValid()); return fFlags & kDisabl
ed_StencilFlag; } | |
64 bool doesWrite() const { SkASSERT(this->isValid()); | |
65 return !(fFlags & kNoModifyStencil_StencilFlag); } | |
66 bool isTwoSided() const { SkASSERT(this->isValid()); | |
67 return !(fFlags & kSingleSided_StencilFlag); } | |
68 bool usesWrapOp() const { SkASSERT(this->isValid()); | |
69 return !(fFlags & kNoWrapOps_StencilFlag); } | |
70 | |
71 void genKey(GrProcessorKeyBuilder* b) const; | |
72 | |
73 bool operator!=(const GrStencilSettings& that) const { return !(*this == tha
t); } | |
74 bool operator==(const GrStencilSettings&) const; | |
75 | |
76 struct Face : public GrTStencilFaceSettings<GrStencilTest, GrStencilOp> { | |
77 void reset(const GrUserStencilSettings::Face&, bool useStencilClip, int
numStencilBits); | |
78 void setDisabled(); | |
79 }; | |
80 | |
81 const Face& front() const { SkASSERT(!this->isDisabled()); return fFront; } | |
82 const Face& back() const { SkASSERT(this->isTwoSided()); return fBack; } | |
83 | |
84 /** | |
85 * Given a thing to draw into the stencil clip, a fill type, and a set op | |
86 * this function determines: | |
87 * 1. Whether the thing can be draw directly to the stencil clip or | |
88 * needs to be drawn to the client portion of the stencil first. | |
89 * 2. How many passes are needed. | |
90 * 3. What those passes are. | |
91 * | |
92 * @param op the set op to combine this element with the exis
ting clip | |
93 * @param canBeDirect can the caller draw this element directly (witho
ut using stencil)? | |
94 * @param invertedFill is this path inverted | |
95 * @param drawDirectToClip out: true if caller should draw the element dire
ctly, false if it | |
96 * should draw it into the user stencil bits first. | |
97 * | |
98 * @return a null-terminated array of settings for stencil passes. | |
99 * | |
100 * If drawDirectToClip is false, the caller must first draw the elem
ent into the user | |
101 * stencil bits, and then cover the clip area with multiple passes u
sing the returned | |
102 * stencil settings. | |
103 * | |
104 * If drawDirectToClip is true, the returned array will only have on
e pass and the | |
105 * caller should use those stencil settings while drawing the elemen
t directly. | |
106 */ | |
107 static GrUserStencilSettings const* const* GetClipPasses(SkRegion::Op op, | |
108 bool canBeDirect, | |
109 bool invertedFill, | |
110 bool* drawDirectToC
lip); | |
111 | |
112 private: | |
113 // Internal flag for backends to optionally mark their tracked stencil state
as invalid. | |
114 enum { kInvalid_PrivateFlag = (kLast_StencilFlag << 1) }; | |
115 | |
116 uint32_t fFlags; | |
117 Face fFront; | |
118 Face fBack; | |
119 }; | |
120 | |
121 #endif | |
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