Flutter Impeller
solid_rrect_like_blur_contents.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_CONTENTS_SOLID_RRECT_LIKE_BLUR_CONTENTS_H_
6 #define FLUTTER_IMPELLER_ENTITY_CONTENTS_SOLID_RRECT_LIKE_BLUR_CONTENTS_H_
7 
8 #include <functional>
9 #include <memory>
10 #include <vector>
11 
15 
16 namespace impeller {
17 
18 /// @brief A base class for SolidRRectBlurContents and
19 /// SolidRSuperellipseBlurContents.
21  public:
23 
24  void SetShape(Rect rect, Scalar corner_radius);
25 
26  void SetSigma(Sigma sigma);
27 
28  void SetColor(Color color);
29 
30  Color GetColor() const;
31 
32  // |Contents|
33  std::optional<Rect> GetCoverage(const Entity& entity) const override;
34 
35  // |Contents|
36  bool Render(const ContentContext& renderer,
37  const Entity& entity,
38  RenderPass& pass) const override;
39 
40  // |Contents|
41  [[nodiscard]] bool ApplyColorFilter(
42  const ColorFilterProc& color_filter_proc) override;
43 
44  protected:
45  struct PassContext {
46  // General info
48  // Frag info
57  };
58 
60 
61  virtual bool SetPassInfo(RenderPass& pass,
62  const ContentContext& renderer,
63  PassContext& pass_context) const = 0;
64 
65  Rect GetRect() const { return rect_; }
66  Scalar GetCornerRadius() const { return corner_radius_; }
67  Sigma GetSigma() const { return sigma_; }
68 
69  static Vector4 Concat(Vector2& a, Vector2& b);
70 
71  private:
72  static bool PopulateFragContext(PassContext& pass_context,
73  Scalar blurSigma,
74  Point center,
75  Point rSize,
76  Scalar radius);
77 
78  Rect rect_;
79  Scalar corner_radius_;
80  Sigma sigma_;
81  Color color_;
82 
84 
86  delete;
87 };
88 
89 } // namespace impeller
90 
91 #endif // FLUTTER_IMPELLER_ENTITY_CONTENTS_SOLID_RRECT_LIKE_BLUR_CONTENTS_H_
std::function< Color(Color)> ColorFilterProc
Definition: contents.h:35
Render passes encode render commands directed as one specific render target into an underlying comman...
Definition: render_pass.h:30
A base class for SolidRRectBlurContents and SolidRSuperellipseBlurContents.
void SetShape(Rect rect, Scalar corner_radius)
std::optional< Rect > GetCoverage(const Entity &entity) const override
Get the area of the render pass that will be affected when this contents is rendered.
virtual bool SetPassInfo(RenderPass &pass, const ContentContext &renderer, PassContext &pass_context) const =0
bool Render(const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
bool ApplyColorFilter(const ColorFilterProc &color_filter_proc) override
If possible, applies a color filter to this contents inputs on the CPU.
static Vector4 Concat(Vector2 &a, Vector2 &b)
float Scalar
Definition: scalar.h:19
In filters that use Gaussian distributions, "sigma" is a size of one standard deviation in terms of t...
Definition: sigma.h:32