#include <blend_filter_contents.h>

Inheritance diagram for impeller::BlendFilterContents:

Public Types
using	AdvancedBlendProc = std::function< std::optional< Entity >(const FilterInput::Vector &inputs, const ContentContext &renderer, const Entity &entity, const Rect &coverage, BlendMode blend_mode, std::optional< Color > foreground_color, ColorFilterContents::AbsorbOpacity absorb_opacity, std::optional< Scalar > alpha)>

Public Types inherited from impeller::ColorFilterContents
enum class	AbsorbOpacity { kYes , kNo }

Public Types inherited from impeller::FilterContents
enum class	BlurStyle { kNormal , kSolid , kOuter , kInner }

enum class	MorphType { kDilate , 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)>

Public Member Functions
	BlendFilterContents ()

	~BlendFilterContents () override

void	SetBlendMode (BlendMode blend_mode)

void	SetForegroundColor (std::optional< Color > color)
	Sets a source color which is blended after all of the inputs have been blended.

Public Member Functions inherited from impeller::ColorFilterContents
	ColorFilterContents ()

	~ColorFilterContents () override

void	SetAbsorbOpacity (AbsorbOpacity absorb_opacity)

AbsorbOpacity	GetAbsorbOpacity () const

void	SetAlpha (Scalar alpha)
	Sets an alpha that is applied to the final blended result.

std::optional< Scalar >	GetAlpha () const

std::optional< Rect >	GetFilterSourceCoverage (const Matrix &effect_transform, const Rect &output_limit) const override
	Internal utility method for \|GetSourceCoverage\| that computes the inverse effect of this transform on the specified output coverage, ignoring the inputs which will be accommodated by the caller.

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.

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.

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.

bool	Render (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override

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.

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.

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, const std::string &label="Filter Snapshot") const override
	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)`.

const FilterContents *	AsFilter () const override
	Cast to a filter. Returns `nullptr` if this Contents is not a filter.

std::optional< Rect >	GetSourceCoverage (const Matrix &effect_transform, const Rect &output_limit) const
	Determines the coverage of source pixels that will be needed to produce results for the specified \|output_limit\| under the specified \|effect_transform\|. This is essentially a reverse of the \|GetCoverage\| method computing a source coverage from an intended \|output_limit\| coverage.

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 transforms to the filtered content. For example: Rotating, scaling, and skewing are all basis transforms, but translating is not.

bool	IsLeaf () const
	Returns `true` if this filter does not have any `FilterInput` children.

void	SetLeafInputs (const FilterInput::Vector &inputs)
	Replaces the set of all leaf `FilterContents` with a new set of `FilterInput`s.

virtual void	SetRenderingMode (Entity::RenderingMode rendering_mode)
	Marks this filter chain as applying in a subpass scenario.

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()`.

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.

virtual ClipCoverage	GetClipCoverage (const Entity &entity, const std::optional< Rect > &current_clip_coverage) const
	Given the current pass space bounding rectangle of the clip buffer, return the expected clip coverage after this draw call. This should only be implemented for contents that may write to the clip buffer.

virtual bool	ShouldRender (const Entity &entity, const std::optional< Rect > clip_coverage) const

std::optional< Size >	GetColorSourceSize () const
	Return the color source's intrinsic size, if available.

void	SetColorSourceSize (Size size)

virtual bool	CanInheritOpacity (const Entity &entity) const
	Whether or not this contents can accept the opacity peephole optimization.

virtual void	SetInheritedOpacity (Scalar opacity)
	Inherit the provided opacity.

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.

virtual bool	ApplyColorFilter (const ColorFilterProc &color_filter_proc)
	If possible, applies a color filter to this contents inputs on the CPU.

Private Member Functions
std::optional< Entity >	RenderFilter (const FilterInput::Vector &inputs, const ContentContext &renderer, const Entity &entity, const Matrix &effect_transform, const Rect &coverage, const std::optional< Rect > &coverage_hint) const override
	Converts zero or more filter inputs into a render instruction.

Additional Inherited Members
Static Public Member Functions inherited from impeller::ColorFilterContents
static std::shared_ptr< ColorFilterContents >	MakeBlend (BlendMode blend_mode, FilterInput::Vector inputs, std::optional< Color > foreground_color=std::nullopt)
	the [inputs] are expected to be in the order of dst, src.

static std::shared_ptr< ColorFilterContents >	MakeColorMatrix (FilterInput::Ref input, const ColorMatrix &color_matrix)

static std::shared_ptr< ColorFilterContents >	MakeLinearToSrgbFilter (FilterInput::Ref input)

static std::shared_ptr< ColorFilterContents >	MakeSrgbToLinearFilter (FilterInput::Ref input)

Static Public Member Functions inherited from impeller::FilterContents
static std::shared_ptr< FilterContents >	MakeGaussianBlur (const FilterInput::Ref &input, Sigma sigma_x, Sigma sigma_y, Entity::TileMode tile_mode=Entity::TileMode::kDecal, BlurStyle mask_blur_style=BlurStyle::kNormal, const std::shared_ptr< Geometry > &mask_geometry=nullptr)

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)

Static Public Attributes inherited from impeller::FilterContents
static const int32_t	kBlurFilterRequiredMipCount

Detailed Description

Definition at line 35 of file blend_filter_contents.h.

Member Typedef Documentation

◆ AdvancedBlendProc

using impeller::BlendFilterContents::AdvancedBlendProc = std::function<std::optional<Entity>( const FilterInput::Vector& inputs, const ContentContext& renderer, const Entity& entity, const Rect& coverage, BlendMode blend_mode, std::optional<Color> foreground_color, ColorFilterContents::AbsorbOpacity absorb_opacity, std::optional<Scalar> alpha)>

Definition at line 37 of file blend_filter_contents.h.

Constructor & Destructor Documentation

◆ BlendFilterContents()

impeller::BlendFilterContents::BlendFilterContents ( )

Definition at line 66 of file blend_filter_contents.cc.

                                         {
  SetBlendMode(BlendMode::kSourceOver);
}

◆ ~BlendFilterContents()

impeller::BlendFilterContents::~BlendFilterContents ( )

overridedefault

Member Function Documentation

◆ RenderFilter()

std::optional< Entity > impeller::BlendFilterContents::RenderFilter	(	const FilterInput::Vector &	inputs,
		const ContentContext &	renderer,
		const Entity &	entity,
		const Matrix &	effect_transform,
		const Rect &	coverage,
		const std::optional< Rect > &	coverage_hint
	)		const

overrideprivatevirtual

Converts zero or more filter inputs into a render instruction.

Implements impeller::FilterContents.

Definition at line 947 of file blend_filter_contents.cc.

                                                  {
  if (inputs.empty()) {
    return std::nullopt;
  }
 
  if (inputs.size() == 1 && !foreground_color_.has_value()) {
    // Nothing to blend.
    return PipelineBlend(inputs, renderer, entity, coverage, BlendMode::kSource,
                         std::nullopt, GetAbsorbOpacity(), GetAlpha());
  }
 
  if (blend_mode_ <= Entity::kLastPipelineBlendMode) {
    if (inputs.size() == 1 && foreground_color_.has_value() &&
        GetAbsorbOpacity() == ColorFilterContents::AbsorbOpacity::kYes) {
      return CreateForegroundPorterDuffBlend(
          inputs[0], renderer, entity, coverage, foreground_color_.value(),
          blend_mode_, GetAlpha(), GetAbsorbOpacity());
    }
    return PipelineBlend(inputs, renderer, entity, coverage, blend_mode_,
                         foreground_color_, GetAbsorbOpacity(), GetAlpha());
  }
 
  if (blend_mode_ <= Entity::kLastAdvancedBlendMode) {
    if (renderer.GetDeviceCapabilities().SupportsFramebufferFetch()) {
      return CreateFramebufferAdvancedBlend(inputs, renderer, entity, coverage,
                                            foreground_color_, blend_mode_,
                                            GetAlpha(), GetAbsorbOpacity());
    }
    if (inputs.size() == 1 && foreground_color_.has_value() &&
        GetAbsorbOpacity() == ColorFilterContents::AbsorbOpacity::kYes) {
      return CreateForegroundAdvancedBlend(
          inputs[0], renderer, entity, coverage, foreground_color_.value(),
          blend_mode_, GetAlpha(), GetAbsorbOpacity());
    }
    return advanced_blend_proc_(inputs, renderer, entity, coverage, blend_mode_,
                                foreground_color_, GetAbsorbOpacity(),
                                GetAlpha());
  }
 
  FML_UNREACHABLE();
}

◆ SetBlendMode()

void impeller::BlendFilterContents::SetBlendMode ( BlendMode blend_mode )

Definition at line 912 of file blend_filter_contents.cc.

                                                           {
  if (blend_mode > Entity::kLastAdvancedBlendMode) {
    VALIDATION_LOG << "Invalid blend mode " << static_cast<int>(blend_mode)
                   << " assigned to BlendFilterContents.";
  }
 
  blend_mode_ = blend_mode;
 
  if (blend_mode > Entity::kLastPipelineBlendMode) {
    switch (blend_mode) {
      BLEND_CASE(Screen)
      BLEND_CASE(Overlay)
      BLEND_CASE(Darken)
      BLEND_CASE(Lighten)
      BLEND_CASE(ColorDodge)
      BLEND_CASE(ColorBurn)
      BLEND_CASE(HardLight)
      BLEND_CASE(SoftLight)
      BLEND_CASE(Difference)
      BLEND_CASE(Exclusion)
      BLEND_CASE(Multiply)
      BLEND_CASE(Hue)
      BLEND_CASE(Saturation)
      BLEND_CASE(Color)
      BLEND_CASE(Luminosity)
      default:
        FML_UNREACHABLE();
    }
  }
}

◆ SetForegroundColor()

void impeller::BlendFilterContents::SetForegroundColor ( std::optional< Color > color )

Sets a source color which is blended after all of the inputs have been blended.

Definition at line 943 of file blend_filter_contents.cc.

                                                                     {
  foreground_color_ = color;
}

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

impeller/entity/contents/filters/blend_filter_contents.h
impeller/entity/contents/filters/blend_filter_contents.cc

Public Types

Public Member Functions

Private Member Functions

Additional Inherited Members