Flutter Impeller
circle_geometry.h
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef FLUTTER_IMPELLER_ENTITY_GEOMETRY_CIRCLE_GEOMETRY_H_
6 #define FLUTTER_IMPELLER_ENTITY_GEOMETRY_CIRCLE_GEOMETRY_H_
7 
9 
10 namespace impeller {
11 
12 // Geometry class that can generate vertices (with or without texture
13 // coordinates) for either filled or stroked circles
14 class CircleGeometry final : public Geometry {
15  public:
16  explicit CircleGeometry(const Point& center, Scalar radius);
17 
18  explicit CircleGeometry(const Point& center,
19  Scalar radius,
20  Scalar stroke_width);
21 
22  ~CircleGeometry() override;
23 
24  // |Geometry|
25  bool CoversArea(const Matrix& transform, const Rect& rect) const override;
26 
27  // |Geometry|
28  bool IsAxisAlignedRect() const override;
29 
30  // |Geometry|
31  Scalar ComputeAlphaCoverage(const Matrix& transform) const override;
32 
33  private:
34  // |Geometry|
35  GeometryResult GetPositionBuffer(const ContentContext& renderer,
36  const Entity& entity,
37  RenderPass& pass) const override;
38 
39  // |Geometry|
40  std::optional<Rect> GetCoverage(const Matrix& transform) const override;
41 
42  Point center_;
43  Scalar radius_;
44  Scalar stroke_width_;
45 
46  CircleGeometry(const CircleGeometry&) = delete;
47 
48  CircleGeometry& operator=(const CircleGeometry&) = delete;
49 };
50 
51 } // namespace impeller
52 
53 #endif // FLUTTER_IMPELLER_ENTITY_GEOMETRY_CIRCLE_GEOMETRY_H_
Scalar ComputeAlphaCoverage(const Matrix &transform) const override
bool CoversArea(const Matrix &transform, const Rect &rect) const override
Determines if this geometry, transformed by the given transform, will completely cover all surface ar...
bool IsAxisAlignedRect() const override
CircleGeometry(const Point &center, Scalar radius)
Render passes encode render commands directed as one specific render target into an underlying comman...
Definition: render_pass.h:30
float Scalar
Definition: scalar.h:19
A 4x4 matrix using column-major storage.
Definition: matrix.h:37