| Flutter Impeller |

Classes | Public Member Functions | Protected Member Functions | Static Protected Member Functions | List of all members
impeller::SolidRRectLikeBlurContents Class Referenceabstract

A base class for SolidRRectBlurContents and SolidRSuperellipseBlurContents. More...

`#include <solid_rrect_like_blur_contents.h>`

Inheritance diagram for impeller::SolidRRectLikeBlurContents:

## Classes
struct | PassContext

## Public Member Functions
| ~SolidRRectLikeBlurContents () override
void | SetShape (Rect rect, Scalar corner_radius)
void | SetSigma (Sigma sigma)
void | SetColor (Color color)
Color | GetColor () const
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. More...
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. More...
Public Member Functions inherited from impeller::Contents
| Contents ()
virtual | ~Contents ()
void | SetCoverageHint (std::optional< Rect > coverage_hint)
| Hint that specifies the coverage area of this Contents that will actually be used during rendering. This is for optimization purposes only and can not be relied on as a clip. May optionally affect the result of `GetCoverage()`. More...
const std::optional< Rect > & | GetCoverageHint () const
virtual bool | IsOpaque (const Matrix &transform) const
| Whether this Contents only emits opaque source colors from the fragment stage. This value does not account for any entity properties (e.g. the blend mode), clips/visibility culling, or inherited opacity. More...
virtual std::optional< Snapshot > | RenderToSnapshot (const ContentContext &renderer, const Entity &entity, std::optional< Rect > coverage_limit=std::nullopt, const std::optional< SamplerDescriptor > &sampler_descriptor=std::nullopt, bool msaa_enabled=true, int32_t mip_count=1, std::string_view label="Snapshot") const
| Render this contents to a snapshot, respecting the entity's transform, path, clip depth, and blend mode. The result texture size is always the size of `GetCoverage(entity)`. More...
std::optional< Size > | GetColorSourceSize () const
| Return the color source's intrinsic size, if available. More...
void | SetColorSourceSize (Size size)
virtual void | SetInheritedOpacity (Scalar opacity)
| Inherit the provided opacity. More...
virtual std::optional< Color > | AsBackgroundColor (const Entity &entity, ISize target_size) const
| Returns a color if this Contents will flood the given `target_size` with a color. This output color is the "Source" color that will be used for the Entity's blend operation. More...

## Protected Member Functions
| SolidRRectLikeBlurContents ()
virtual bool | SetPassInfo (RenderPass &pass, const ContentContext &renderer, PassContext &pass_context) const =0
Rect | GetRect () const
Scalar | GetCornerRadius () const
Sigma | GetSigma () const

## Static Protected Member Functions
static Vector4 | Concat (Vector2 &a, Vector2 &b)

## Additional Inherited Members
Public Types inherited from impeller::Contents
using | ColorFilterProc = std::function< Color(Color)>
using | RenderProc = std::function< bool(const ContentContext &renderer, const Entity &entity, RenderPass &pass)>
using | CoverageProc = std::function< std::optional< Rect >(const Entity &entity)>
Static Public Member Functions inherited from impeller::Contents
static std::shared_ptr< Contents > | MakeAnonymous (RenderProc render_proc, CoverageProc coverage_proc)

## Detailed Description

A base class for SolidRRectBlurContents and SolidRSuperellipseBlurContents.

Definition at line 20 of file solid_rrect_like_blur_contents.h.

## Constructor & Destructor Documentation

## ◆ ~SolidRRectLikeBlurContents()

impeller::SolidRRectLikeBlurContents::~SolidRRectLikeBlurContents | ( |  | ) |
| override default

## ◆ SolidRRectLikeBlurContents()

impeller::SolidRRectLikeBlurContents::SolidRRectLikeBlurContents | ( |  | ) |
| protected default

## Member Function Documentation

## ◆ ApplyColorFilter()

bool impeller::SolidRRectLikeBlurContents::ApplyColorFilter | ( | const ColorFilterProc & | color_filter_proc | ) |
| override virtual

If possible, applies a color filter to this contents inputs on the CPU.

This method will either fully apply the color filter or perform no action. Partial/incorrect application of the color filter will never occur.

Parameters

  [in] | color_filter_proc | A function that filters a given unpremultiplied color to produce a new unpremultiplied color.

Returns
  True if the color filter was able to be fully applied to all all relevant inputs. Otherwise, this operation is a no-op and false is returned.

Reimplemented from impeller::Contents.

Definition at line 187 of file solid_rrect_like_blur_contents.cc.

188 {
189 color_ = color_filter_proc(color_);
190 return true;
191 }

## ◆ Concat()

Vector4 impeller::SolidRRectLikeBlurContents::Concat | ( | Vector2 & | a,
|  | Vector2 & | b
| ) |  |
| static protected

Definition at line 193 of file solid_rrect_like_blur_contents.cc.

193 {
194 return {a.x, a.y, b.x, b.y};
195 }
impeller::saturated::b
SI b
Definition: saturated_math.h:87

References impeller::saturated::b, impeller::TPoint< T >::x, and impeller::TPoint< T >::y.

Referenced by impeller::SolidRRectBlurContents::SetPassInfo().

## ◆ GetColor()

Color impeller::SolidRRectLikeBlurContents::GetColor | ( |  | ) | const

Definition at line 46 of file solid_rrect_like_blur_contents.cc.

46 {
47 return color_;
48 }

Referenced by impeller::SolidRRectBlurContents::SetPassInfo().

## ◆ GetCornerRadius()

Scalar impeller::SolidRRectLikeBlurContents::GetCornerRadius | ( |  | ) | const
| inline protected

Definition at line 66 of file solid_rrect_like_blur_contents.h.

66 { return corner_radius_; }

## ◆ GetCoverage()

std::optional< Rect > impeller::SolidRRectLikeBlurContents::GetCoverage | ( | const Entity & | entity | ) | const
| override virtual

Get the area of the render pass that will be affected when this contents is rendered.

During rendering, coverage coordinates count pixels from the top left corner of the framebuffer.

Returns
  The coverage rectangle. An `std::nullopt` result means that rendering this contents has no effect on the output color.

Implements impeller::Contents.

Definition at line 108 of file solid_rrect_like_blur_contents.cc.

109 {
110 Scalar radius = PadForSigma(sigma_.sigma);
111
112 return rect_.Expand(radius).TransformBounds(entity.GetTransform());
113 }
impeller::Scalar
float Scalar
Definition: scalar.h:19
impeller::Sigma::sigma
Scalar sigma
Definition: sigma.h:33
impeller::TRect::Expand
constexpr TRect< T > Expand(T left, T top, T right, T bottom) const
Returns a rectangle with expanded edges. Negative expansion results in shrinking.
Definition: rect.h:622
impeller::TRect::TransformBounds
constexpr TRect TransformBounds(const Matrix &transform) const
Creates a new bounding box that contains this transformed rectangle.
Definition: rect.h:476

References impeller::TRect< T >::Expand(), impeller::Entity::GetTransform(), impeller::Sigma::sigma, and impeller::TRect< T >::TransformBounds().

## ◆ GetRect()

Rect impeller::SolidRRectLikeBlurContents::GetRect | ( |  | ) | const
| inline protected

Definition at line 65 of file solid_rrect_like_blur_contents.h.

65 { return rect_; }

## ◆ GetSigma()

Sigma impeller::SolidRRectLikeBlurContents::GetSigma | ( |  | ) | const
| inline protected

Definition at line 67 of file solid_rrect_like_blur_contents.h.

67 { return sigma_; }

## ◆ Render()

bool impeller::SolidRRectLikeBlurContents::Render | ( | const ContentContext & | renderer,
|  | const Entity & | entity,
|  | RenderPass & | pass
| ) |  | const
| override virtual

Implements impeller::Contents.

Definition at line 115 of file solid_rrect_like_blur_contents.cc.

117 {
118 using VS = RrectLikeBlurVertexShader;
119
120 Matrix basis_invert = entity.GetTransform().Basis().Invert();
121 Vector2 max_sigmas =
122 Vector2((basis_invert * Vector2(500.f, 0.f)).GetLength(),
123 (basis_invert * Vector2(0.f, 500.f)).GetLength());
124 Scalar max_sigma = std::min(max_sigmas.x, max_sigmas.y);
125 // Clamp the max kernel width/height to 1000 (@ 2x) to limit the extent
126 // of the blur and to kEhCloseEnough to prevent NaN calculations
127 // trying to evaluate a Gaussian distribution with a sigma of 0.
128 auto blur_sigma = std::clamp(sigma_.sigma, kEhCloseEnough, max_sigma);
129 // Increase quality by making the radius a bit bigger than the typical
130 // sigma->radius conversion we use for slower blurs.
131 Scalar blur_radius = PadForSigma(blur_sigma);
132 Rect positive_rect = rect_.GetPositive();
133 Scalar left = -blur_radius;
134 Scalar top = -blur_radius;
135 Scalar right = positive_rect.GetWidth() + blur_radius;
136 Scalar bottom = positive_rect.GetHeight() + blur_radius;
137
138 ContentContextOptions opts = OptionsFromPassAndEntity(pass, entity);
139 opts.primitive_type = PrimitiveType::kTriangleStrip;
140 Color color = color_;
141 if (entity.GetBlendMode() == BlendMode::kClear) {
142 opts.is_for_rrect_blur_clear = true;
143 color = Color::White();
144 }
145
146 std::array<VS::PerVertexData, 4> vertices = {
147 VS::PerVertexData{Point(left, top)},
148 VS::PerVertexData{Point(right, top)},
149 VS::PerVertexData{Point(left, bottom)},
150 VS::PerVertexData{Point(right, bottom)},
151 };
152
153 PassContext pass_context = {
154 .opts = opts,
155 };
156
157 Scalar radius = std::min(std::clamp(corner_radius_, kEhCloseEnough,
158 positive_rect.GetWidth() * 0.5f),
159 std::clamp(corner_radius_, kEhCloseEnough,
160 positive_rect.GetHeight() * 0.5f));
161 if (!PopulateFragContext(pass_context, blur_sigma, positive_rect.GetCenter(),
162 Point(positive_rect.GetSize()), radius)) {
163 return true;
164 }
165
166 if (!SetPassInfo(pass, renderer, pass_context)) {
167 return true;
168 }
169
170 VS::FrameInfo frame_info;
171 frame_info.mvp = Entity::GetShaderTransform(
172 entity.GetShaderClipDepth(), pass,
173 entity.GetTransform() *
174 Matrix::MakeTranslation(positive_rect.GetOrigin()));
175
176 auto& host_buffer = renderer.GetTransientsBuffer();
177 pass.SetVertexBuffer(CreateVertexBuffer(vertices, host_buffer));
178 VS::BindFrameInfo(pass, host_buffer.EmplaceUniform(frame_info));
179
180 if (!pass.Draw().ok()) {
181 return false;
182 }
183
184 return true;
185 }
impeller::Entity::GetShaderTransform
Matrix GetShaderTransform(const RenderPass &pass) const
Definition: entity.cc:48
impeller::SolidRRectLikeBlurContents::SetPassInfo
virtual bool SetPassInfo(RenderPass &pass, const ContentContext &renderer, PassContext &pass_context) const =0
blur_radius
Vector2 blur_radius
Blur radius in source pixels based on scaled_sigma.
Definition: gaussian_blur_filter_contents.cc:84
impeller::PrimitiveType::kTriangleStrip
@ kTriangleStrip
impeller::Vector2
Point Vector2
Definition: point.h:331
impeller::kEhCloseEnough
constexpr float kEhCloseEnough
Definition: constants.h:57
impeller::Rect
TRect< Scalar > Rect
Definition: rect.h:792
impeller::Point
TPoint< Scalar > Point
Definition: point.h:327
impeller::CreateVertexBuffer
VertexBuffer CreateVertexBuffer(std::array< VertexType, size > input, HostBuffer &host_buffer)
Create an index-less vertex buffer from a fixed size array.
Definition: vertex_buffer_builder.h:24
impeller::BlendMode::kClear
@ kClear
impeller::VS
LinePipeline::VertexShader VS
Definition: line_contents.cc:13
impeller::OptionsFromPassAndEntity
ContentContextOptions OptionsFromPassAndEntity(const RenderPass &pass, const Entity &entity)
Definition: contents.cc:34
impeller::Color::White
static constexpr Color White()
Definition: color.h:264
impeller::Matrix::MakeTranslation
static constexpr Matrix MakeTranslation(const Vector3 &t)
Definition: matrix.h:95
impeller::TRect::GetPositive
constexpr TRect GetPositive() const
Get a version of this rectangle that has a non-negative size.
Definition: rect.h:402

References impeller::Matrix::Basis(), blur_radius, impeller::CreateVertexBuffer(), impeller::RenderPass::Draw(), impeller::Entity::GetBlendMode(), impeller::TRect< T >::GetCenter(), impeller::TRect< T >::GetHeight(), impeller::TRect< T >::GetOrigin(), impeller::TRect< T >::GetPositive(), impeller::Entity::GetShaderClipDepth(), impeller::Entity::GetShaderTransform(), impeller::TRect< T >::GetSize(), impeller::Entity::GetTransform(), impeller::ContentContext::GetTransientsBuffer(), impeller::TRect< T >::GetWidth(), impeller::Matrix::Invert(), impeller::ContentContextOptions::is_for_rrect_blur_clear, impeller::kClear, impeller::kEhCloseEnough, impeller::kTriangleStrip, impeller::Matrix::MakeTranslation(), impeller::OptionsFromPassAndEntity(), impeller::SolidRRectLikeBlurContents::PassContext::opts, impeller::ContentContextOptions::primitive_type, SetPassInfo(), impeller::RenderPass::SetVertexBuffer(), impeller::Sigma::sigma, impeller::Color::White(), impeller::TPoint< T >::x, and impeller::TPoint< T >::y.

## ◆ SetColor()

void impeller::SolidRRectLikeBlurContents::SetColor | ( | Color | color | ) |

Definition at line 42 of file solid_rrect_like_blur_contents.cc.

42 {
43 color_ = color.Premultiply();
44 }
impeller::Color::Premultiply
constexpr Color Premultiply() const
Definition: color.h:212

References impeller::Color::Premultiply().

## ◆ SetPassInfo()

virtual bool impeller::SolidRRectLikeBlurContents::SetPassInfo | ( | RenderPass & | pass,
|  | const ContentContext & | renderer,
|  | PassContext & | pass_context
| ) |  | const
| protected pure virtual

Implemented in impeller::SolidRRectBlurContents.

Referenced by Render().

## ◆ SetShape()

void impeller::SolidRRectLikeBlurContents::SetShape | ( | Rect | rect,
|  | Scalar | corner_radius
| ) |  |

Definition at line 33 of file solid_rrect_like_blur_contents.cc.

33 {
34 rect_ = rect;
35 corner_radius_ = corner_radius;
36 }

## ◆ SetSigma()

void impeller::SolidRRectLikeBlurContents::SetSigma | ( | Sigma | sigma | ) |

Definition at line 38 of file solid_rrect_like_blur_contents.cc.

38 {
39 sigma_ = sigma;
40 }

The documentation for this class was generated from the following files:

- impeller/entity/contents/solid_rrect_like_blur_contents.h
- impeller/entity/contents/solid_rrect_like_blur_contents.cc