Flutter Impeller
ellipse_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_ELLIPSE_GEOMETRY_H_
6 #define FLUTTER_IMPELLER_ENTITY_GEOMETRY_ELLIPSE_GEOMETRY_H_
7 
9 
10 namespace impeller {
11 
12 // Geometry class that can generate vertices (with or without texture
13 // coordinates) for filled ellipses. Generating vertices for a stroked
14 // ellipse would require a lot more work since the line width must be
15 // applied perpendicular to the distorted ellipse shape.
16 class EllipseGeometry final : public Geometry {
17  public:
18  explicit EllipseGeometry(Rect bounds);
19 
20  ~EllipseGeometry() = default;
21 
22  // |Geometry|
23  bool CoversArea(const Matrix& transform, const Rect& rect) const override;
24 
25  // |Geometry|
26  bool IsAxisAlignedRect() const override;
27 
28  private:
29  // |Geometry|
30  GeometryResult GetPositionBuffer(const ContentContext& renderer,
31  const Entity& entity,
32  RenderPass& pass) const override;
33 
34  // |Geometry|
35  GeometryVertexType GetVertexType() const override;
36 
37  // |Geometry|
38  std::optional<Rect> GetCoverage(const Matrix& transform) const override;
39 
40  // |Geometry|
41  GeometryResult GetPositionUVBuffer(Rect texture_coverage,
42  Matrix effect_transform,
43  const ContentContext& renderer,
44  const Entity& entity,
45  RenderPass& pass) const override;
46 
47  Rect bounds_;
48 
49  EllipseGeometry(const EllipseGeometry&) = delete;
50 
51  EllipseGeometry& operator=(const EllipseGeometry&) = delete;
52 };
53 
54 } // namespace impeller
55 
56 #endif // FLUTTER_IMPELLER_ENTITY_GEOMETRY_ELLIPSE_GEOMETRY_H_
impeller::EllipseGeometry::EllipseGeometry
EllipseGeometry(Rect bounds)
Definition: ellipse_geometry.cc:13
impeller::GeometryVertexType
GeometryVertexType
Definition: geometry.h:49
impeller::Entity
Definition: entity.h:21
geometry.h
impeller::GeometryResult
Definition: geometry.h:20
impeller::EllipseGeometry::~EllipseGeometry
~EllipseGeometry()=default
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::EllipseGeometry
Definition: ellipse_geometry.h:16
impeller::EllipseGeometry::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: ellipse_geometry.cc:48
impeller::EllipseGeometry::IsAxisAlignedRect
bool IsAxisAlignedRect() const override
Definition: ellipse_geometry.cc:53
impeller
Definition: aiks_blur_unittests.cc:20
impeller::ContentContext
Definition: content_context.h:392
impeller::TRect< Scalar >
impeller::Matrix
A 4x4 matrix using column-major storage.
Definition: matrix.h:37