1 | /* |
---|---|
2 | * Copyright 2020 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 SkSGDashEffect_DEFINED |
9 | #define SkSGDashEffect_DEFINED |
10 | |
11 | #include "include/core/SkPath.h" |
12 | #include "modules/sksg/include/SkSGGeometryNode.h" |
13 | |
14 | #include <vector> |
15 | |
16 | namespace sksg { |
17 | |
18 | /** |
19 | * Apply a dash effect to the child geometry. |
20 | * |
21 | * Follows the same semantics as SkDashPathEffect, with one minor tweak: when the number of |
22 | * intervals is odd, they are repeated once more to attain an even sequence (same as SVG |
23 | * stroke-dasharray: https://www.w3.org/TR/SVG11/painting.html#StrokeDasharrayProperty). |
24 | */ |
25 | class DashEffect final : public GeometryNode { |
26 | public: |
27 | static sk_sp<DashEffect> Make(sk_sp<GeometryNode> child) { |
28 | return child ? sk_sp<DashEffect>(new DashEffect(std::move(child))) : nullptr; |
29 | } |
30 | |
31 | ~DashEffect() override; |
32 | |
33 | SG_ATTRIBUTE(Intervals, std::vector<float>, fIntervals) |
34 | SG_ATTRIBUTE(Phase, float , fPhase ) |
35 | |
36 | protected: |
37 | void onClip(SkCanvas*, bool antiAlias) const override; |
38 | void onDraw(SkCanvas*, const SkPaint&) const override; |
39 | bool onContains(const SkPoint&) const override; |
40 | |
41 | SkRect onRevalidate(InvalidationController*, const SkMatrix&) override; |
42 | SkPath onAsPath() const override; |
43 | |
44 | private: |
45 | explicit DashEffect(sk_sp<GeometryNode>); |
46 | |
47 | const sk_sp<GeometryNode> fChild; |
48 | |
49 | SkPath fDashedPath; // cache |
50 | |
51 | std::vector<float> fIntervals; |
52 | float fPhase; |
53 | }; |
54 | |
55 | } // namespace sksg |
56 | |
57 | #endif // SkSGDashEffect_DEFINED |
58 |