| Flutter Impeller |

Public Member Functions | List of all members
impeller::DirectionalMorphologyFilterContents Class Referencefinal

`#include <morphology_filter_contents.h>`

Inheritance diagram for impeller::DirectionalMorphologyFilterContents:

## Public Member Functions
| DirectionalMorphologyFilterContents ()
| ~DirectionalMorphologyFilterContents () override
void | SetRadius (Radius radius)
void | SetDirection (Vector2 direction)
void | SetMorphType (MorphType morph_type)
std::optional< Rect > | GetFilterCoverage (const FilterInput::Vector &inputs, const Entity &entity, const Matrix &effect_transform) const override
Public Member Functions inherited from impeller::FilterContents
| FilterContents ()
| ~FilterContents () override
void | SetInputs (FilterInput::Vector inputs)
| The input texture sources for this filter. Each input's emitted texture is expected to have premultiplied alpha colors. More...
void | SetEffectTransform (const Matrix &effect_transform)
| Sets the transform which gets appended to the effect of this filter. Note that this is in addition to the entity's transform. More...
std::optional< Entity > | GetEntity (const ContentContext &renderer, const Entity &entity, const std::optional< Rect > &coverage_hint) const
| Create an Entity that renders this filter's output. More...
bool | Render (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
std::optional< Rect > | GetCoverage (const Entity &entity) const override
| Get the screen space bounding rectangle that this contents affects. More...
void | PopulateGlyphAtlas (const std::shared_ptr< LazyGlyphAtlas > &lazy_glyph_atlas, Scalar scale) override
| Add any text data to the specified lazy atlas. The scale parameter must be used again later when drawing the text. More...
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, const std::string &label="Filter Snapshot") const override
| Render this contents to a snapshot, respecting the entity's transform, path, stencil depth, and blend mode. The result texture size is always the size of `GetCoverage(entity)`. More...
const FilterContents * | AsFilter () const override
| Cast to a filter. Returns `nullptr` if this Contents is not a filter. More...
virtual Matrix | GetLocalTransform (const Matrix &parent_transform) const
Matrix | GetTransform (const Matrix &parent_transform) const
virtual bool | IsTranslationOnly () const
| Returns true if this filter graph doesn't perform any basis transformations to the filtered content. For example: Rotating, scaling, and skewing are all basis transformations, but translating is not. More...
bool | IsLeaf () const
| Returns `true` if this filter does not have any `FilterInput` children. More...
void | SetLeafInputs (const FilterInput::Vector &inputs)
| Replaces the set of all leaf `FilterContents` with a new set of `FilterInput`s. More...
virtual void | SetRenderingMode (Entity::RenderingMode rendering_mode)
| Marks this filter chain as applying in a subpass scenario. 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
| 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 StencilCoverage | GetStencilCoverage (const Entity &entity, const std::optional< Rect > &current_stencil_coverage) const
| Given the current screen space bounding rectangle of the stencil, return the expected stencil coverage after this draw call. This should only be implemented for contents that may write to the stencil buffer. More...
virtual bool | ShouldRender (const Entity &entity, const std::optional< Rect > &stencil_coverage) const
std::optional< Size > | GetColorSourceSize () const
| Return the color source's intrinsic size, if available. More...
void | SetColorSourceSize (Size size)
virtual bool | CanInheritOpacity (const Entity &entity) const
| Whether or not this contents can accept the opacity peephole optimization. More...
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...
virtual bool | ApplyColorFilter (const ColorFilterProc &color_filter_proc)
| If possible, applies a color filter to this contents inputs on the CPU. More...

## Additional Inherited Members
Public Types inherited from impeller::FilterContents
enum | BlurStyle { BlurStyle::kNormal, BlurStyle::kSolid, BlurStyle::kOuter, BlurStyle::kInner }
enum | MorphType { MorphType::kDilate, MorphType::kErode }
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::FilterContents
static std::shared_ptr< FilterContents > | MakeDirectionalGaussianBlur (FilterInput::Ref input, Sigma sigma, Vector2 direction, BlurStyle blur_style=BlurStyle::kNormal, Entity::TileMode tile_mode=Entity::TileMode::kDecal, bool is_second_pass=false, Sigma secondary_sigma={})
static std::shared_ptr< FilterContents > | MakeGaussianBlur (const FilterInput::Ref &input, Sigma sigma_x, Sigma sigma_y, BlurStyle blur_style=BlurStyle::kNormal, Entity::TileMode tile_mode=Entity::TileMode::kDecal)
static std::shared_ptr< FilterContents > | MakeBorderMaskBlur (FilterInput::Ref input, Sigma sigma_x, Sigma sigma_y, BlurStyle blur_style=BlurStyle::kNormal)
static std::shared_ptr< FilterContents > | MakeDirectionalMorphology (FilterInput::Ref input, Radius radius, Vector2 direction, MorphType morph_type)
static std::shared_ptr< FilterContents > | MakeMorphology (FilterInput::Ref input, Radius radius_x, Radius radius_y, MorphType morph_type)
static std::shared_ptr< FilterContents > | MakeMatrixFilter (FilterInput::Ref input, const Matrix &matrix, const SamplerDescriptor &desc)
static std::shared_ptr< FilterContents > | MakeLocalMatrixFilter (FilterInput::Ref input, const Matrix &matrix)
static std::shared_ptr< FilterContents > | MakeYUVToRGBFilter (std::shared_ptr< Texture > y_texture, std::shared_ptr< Texture > uv_texture, YUVColorSpace yuv_color_space)
Static Public Member Functions inherited from impeller::Contents
static std::shared_ptr< Contents > | MakeAnonymous (RenderProc render_proc, CoverageProc coverage_proc)

## Detailed Description

Definition at line 14 of file morphology_filter_contents.h.

## Constructor & Destructor Documentation

## ◆ DirectionalMorphologyFilterContents()

impeller::DirectionalMorphologyFilterContents::DirectionalMorphologyFilterContents | ( |  | ) |
| default

## ◆ ~DirectionalMorphologyFilterContents()

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

## Member Function Documentation

## ◆ GetFilterCoverage()

std::optional< Rect > impeller::DirectionalMorphologyFilterContents::GetFilterCoverage | ( | const FilterInput::Vector & | inputs,
|  | const Entity & | entity,
|  | const Matrix & | effect_transform
| ) |  | const
| override virtual

Reimplemented from impeller::FilterContents.

Definition at line 159 of file morphology_filter_contents.cc.

162 {
163 if (inputs.empty()) {
164 return std::nullopt;
165 }
166
167 auto coverage = inputs[0]->GetCoverage(entity);
168 if (!coverage.has_value()) {
169 return std::nullopt;
170 }
171 auto transform = inputs[0]->GetTransform(entity) * effect_transform.Basis();
172 auto transformed_vector =
173 transform.TransformDirection(direction_ * radius_.radius).Abs();
174
175 auto origin = coverage->origin;
176 auto size = Vector2(coverage->size);
177 switch (morph_type_) {
178 case FilterContents::MorphType::kDilate:
179 origin -= transformed_vector;
180 size += transformed_vector * 2;
181 break;
182 case FilterContents::MorphType::kErode:
183 origin += transformed_vector;
184 size -= transformed_vector * 2;
185 break;
186 }
187 if (size.x < 0 || size.y < 0) {
188 return Rect::MakeSize(Size(0, 0));
189 }
190 return Rect(origin, Size(size.x, size.y));
191 }

References impeller::Matrix::Basis(), impeller::FilterContents::kDilate, impeller::FilterContents::kErode, impeller::TRect< Scalar >::MakeSize(), impeller::TRect< T >::origin, impeller::Radius::radius, impeller::TRect< T >::size, and impeller::Matrix::TransformDirection().

## ◆ SetDirection()

void impeller::DirectionalMorphologyFilterContents::SetDirection | ( | Vector2 | direction | ) |

Definition at line 26 of file morphology_filter_contents.cc.

26 {
27 direction_ = direction.Normalize();
28 if (direction_.IsZero()) {
29 direction_ = Vector2(0, 1);
30 }
31 }

References impeller::TPoint< T >::IsZero(), and impeller::TPoint< T >::Normalize().

## ◆ SetMorphType()

void impeller::DirectionalMorphologyFilterContents::SetMorphType | ( | MorphType | morph_type | ) |

Definition at line 33 of file morphology_filter_contents.cc.

33 {
34 morph_type_ = morph_type;
35 }

## ◆ SetRadius()

void impeller::DirectionalMorphologyFilterContents::SetRadius | ( | Radius | radius | ) |

Definition at line 22 of file morphology_filter_contents.cc.

22 {
23 radius_ = radius;
24 }

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

- impeller/entity/contents/filters/morphology_filter_contents.h
- impeller/entity/contents/filters/morphology_filter_contents.cc

impeller::Radius::radius
Scalar radius
Definition: sigma.h:48
impeller::FilterContents::MorphType::kErode
@ kErode
impeller::Vector2
Point Vector2
Definition: point.h:310
impeller::Size
TSize< Scalar > Size
Definition: size.h:135
impeller::TPoint::IsZero
constexpr bool IsZero() const
Definition: point.h:227
impeller::Rect
TRect< Scalar > Rect
Definition: rect.h:306
impeller::TRect< Scalar >::MakeSize
constexpr static TRect MakeSize(const TSize< U > &size)
Definition: rect.h:52
impeller::FilterContents::MorphType::kDilate
@ kDilate
impeller::TPoint::Normalize
constexpr TPoint Normalize() const
Definition: point.h:201