1 | /* |
2 | * Copyright 2018 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 | #ifndef SkSGGradient_DEFINED |
9 | #define SkSGGradient_DEFINED |
10 | |
11 | #include "modules/sksg/include/SkSGRenderEffect.h" |
12 | |
13 | #include "include/core/SkColor.h" |
14 | #include "include/core/SkPoint.h" |
15 | #include "include/core/SkScalar.h" |
16 | #include "include/core/SkShader.h" |
17 | |
18 | #include <vector> |
19 | |
20 | namespace sksg { |
21 | |
22 | /** |
23 | * Gradient base class. |
24 | */ |
25 | class Gradient : public Shader { |
26 | public: |
27 | struct ColorStop { |
28 | SkScalar fPosition; |
29 | SkColor4f fColor; |
30 | |
31 | bool operator==(const ColorStop& other) const { |
32 | return fPosition == other.fPosition && fColor == other.fColor; |
33 | } |
34 | }; |
35 | |
36 | SG_ATTRIBUTE(ColorStops, std::vector<ColorStop>, fColorStops) |
37 | SG_ATTRIBUTE(TileMode , SkTileMode , fTileMode ) |
38 | |
39 | protected: |
40 | sk_sp<SkShader> onRevalidateShader() final; |
41 | |
42 | virtual sk_sp<SkShader> onMakeShader(const std::vector<SkColor4f>& colors, |
43 | const std::vector<SkScalar >& positions) const = 0; |
44 | |
45 | protected: |
46 | Gradient() = default; |
47 | |
48 | private: |
49 | std::vector<ColorStop> fColorStops; |
50 | SkTileMode fTileMode = SkTileMode::kClamp; |
51 | |
52 | using INHERITED = Shader; |
53 | }; |
54 | |
55 | class LinearGradient final : public Gradient { |
56 | public: |
57 | static sk_sp<LinearGradient> Make() { |
58 | return sk_sp<LinearGradient>(new LinearGradient()); |
59 | } |
60 | |
61 | SG_ATTRIBUTE(StartPoint, SkPoint, fStartPoint) |
62 | SG_ATTRIBUTE(EndPoint , SkPoint, fEndPoint ) |
63 | |
64 | protected: |
65 | sk_sp<SkShader> onMakeShader(const std::vector<SkColor4f>&, |
66 | const std::vector<SkScalar >&) const override; |
67 | |
68 | private: |
69 | LinearGradient() = default; |
70 | |
71 | SkPoint fStartPoint = SkPoint::Make(0, 0), |
72 | fEndPoint = SkPoint::Make(0, 0); |
73 | |
74 | using INHERITED = Gradient; |
75 | }; |
76 | |
77 | class RadialGradient final : public Gradient { |
78 | public: |
79 | static sk_sp<RadialGradient> Make() { |
80 | return sk_sp<RadialGradient>(new RadialGradient()); |
81 | } |
82 | |
83 | SG_ATTRIBUTE(StartCenter, SkPoint , fStartCenter) |
84 | SG_ATTRIBUTE(EndCenter , SkPoint , fEndCenter ) |
85 | SG_ATTRIBUTE(StartRadius, SkScalar, fStartRadius) |
86 | SG_ATTRIBUTE(EndRadius , SkScalar, fEndRadius ) |
87 | |
88 | protected: |
89 | sk_sp<SkShader> onMakeShader(const std::vector<SkColor4f>&, |
90 | const std::vector<SkScalar >&) const override; |
91 | |
92 | private: |
93 | RadialGradient() = default; |
94 | |
95 | SkPoint fStartCenter = SkPoint::Make(0, 0), |
96 | fEndCenter = SkPoint::Make(0, 0); |
97 | SkScalar fStartRadius = 0, |
98 | fEndRadius = 0; |
99 | |
100 | using INHERITED = Gradient; |
101 | }; |
102 | |
103 | } // namespace sksg |
104 | |
105 | #endif // SkSGGradient_DEFINED |
106 | |