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,
21 
22  ~CircleGeometry() = default;
23 
24  // |Geometry|
25  bool CoversArea(const Matrix& transform, const Rect& rect) const override;
26 
27  // |Geometry|
28  bool IsAxisAlignedRect() const override;
29 
30  private:
31  // |Geometry|
32  GeometryResult GetPositionBuffer(const ContentContext& renderer,
33  const Entity& entity,
34  RenderPass& pass) const override;
35 
36  // |Geometry|
37  GeometryVertexType GetVertexType() const override;
38 
39  // |Geometry|
40  std::optional<Rect> GetCoverage(const Matrix& transform) const override;
41 
42  // |Geometry|
43  GeometryResult GetPositionUVBuffer(Rect texture_coverage,
44  Matrix effect_transform,
45  const ContentContext& renderer,
46  const Entity& entity,
47  RenderPass& pass) const override;
48 
49  Point center_;
50  Scalar radius_;
51  Scalar stroke_width_;
52 
53  CircleGeometry(const CircleGeometry&) = delete;
54 
55  CircleGeometry& operator=(const CircleGeometry&) = delete;
56 };
57 
58 } // namespace impeller
59 
60 #endif // FLUTTER_IMPELLER_ENTITY_GEOMETRY_CIRCLE_GEOMETRY_H_
impeller::Scalar
float Scalar
Definition: scalar.h:18
impeller::CircleGeometry::CoversArea
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...
Definition: circle_geometry.cc:90
stroke_width
const Scalar stroke_width
Definition: stroke_path_geometry.cc:293
impeller::GeometryVertexType
GeometryVertexType
Definition: geometry.h:49
impeller::Entity
Definition: entity.h:21
geometry.h
impeller::GeometryResult
Definition: geometry.h:20
impeller::CircleGeometry::IsAxisAlignedRect
bool IsAxisAlignedRect() const override
Definition: circle_geometry.cc:95
impeller::RenderPass
Render passes encode render commands directed as one specific render target into an underlying comman...
Definition: render_pass.h:33
impeller::Geometry
Definition: geometry.h:83
impeller::TPoint< Scalar >
impeller::CircleGeometry::CircleGeometry
CircleGeometry(const Point &center, Scalar radius)
Definition: circle_geometry.cc:13
impeller
Definition: aiks_blur_unittests.cc:20
impeller::CircleGeometry
Definition: circle_geometry.h:14
impeller::CircleGeometry::~CircleGeometry
~CircleGeometry()=default
impeller::ContentContext
Definition: content_context.h:392
impeller::TRect< Scalar >
impeller::Matrix
A 4x4 matrix using column-major storage.
Definition: matrix.h:37