#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 ( )

overridedefault

Member Function Documentation

◆ GetFilterCoverage()

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

overridevirtual

Reimplemented from impeller::FilterContents.

Definition at line 159 of file morphology_filter_contents.cc.

                                           {
   if (inputs.empty()) {
     return std::nullopt;
   }
  
   auto coverage = inputs[0]->GetCoverage(entity);
   if (!coverage.has_value()) {
     return std::nullopt;
   }
   auto transform = inputs[0]->GetTransform(entity) * effect_transform.Basis();
   auto transformed_vector =
       transform.TransformDirection(direction_ * radius_.radius).Abs();
  
   auto origin = coverage->origin;
   auto size = Vector2(coverage->size);
   switch (morph_type_) {
     case FilterContents::MorphType::kDilate:
       origin -= transformed_vector;
       size += transformed_vector * 2;
       break;
     case FilterContents::MorphType::kErode:
       origin += transformed_vector;
       size -= transformed_vector * 2;
       break;
   }
   if (size.x < 0 || size.y < 0) {
     return Rect::MakeSize(Size(0, 0));
   }
   return Rect(origin, Size(size.x, size.y));
 }

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.

                                                                         {
   direction_ = direction.Normalize();
   if (direction_.IsZero()) {
     direction_ = Vector2(0, 1);
   }
 }

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.

                                                                            {
   morph_type_ = morph_type;
 }

◆ SetRadius()

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

Definition at line 22 of file morphology_filter_contents.cc.

                                                                  {
   radius_ = radius;
 }

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

Public Member Functions

Additional Inherited Members