An abstract Geometry base class that produces fillable vertices representing the stroked outline of the segments provided by the subclass in the virtual |Dispatch| method. More...

#include <stroke_path_geometry.h>

Inheritance diagram for impeller::StrokeSegmentsGeometry:

Public Member Functions
	~StrokeSegmentsGeometry () override

Scalar	GetStrokeWidth () const

Scalar	GetMiterLimit () const

Cap	GetStrokeCap () const

Join	GetStrokeJoin () const

Scalar	ComputeAlphaCoverage (const Matrix &transform) const override

Public Member Functions inherited from impeller::Geometry
virtual	~Geometry ()

virtual std::optional< Rect >	GetCoverage (const Matrix &transform) const =0

virtual bool	CoversArea (const Matrix &transform, const Rect &rect) const
	Determines if this geometry, transformed by the given `transform`, will completely cover all surface area of the given `rect`.

virtual bool	IsAxisAlignedRect () const

virtual bool	CanApplyMaskFilter () const

Protected Member Functions
	StrokeSegmentsGeometry (const StrokeParameters &parameters)

virtual void	Dispatch (PathAndArcSegmentReceiver &receiver, Tessellator &tessellator, Scalar scale) const =0

std::optional< Rect >	GetStrokeCoverage (const Matrix &transform, const Rect &segment_bounds) const

Friends
class	ImpellerBenchmarkAccessor

class	ImpellerEntityUnitTestAccessor

Additional Inherited Members
Static Public Member Functions inherited from impeller::Geometry
static std::unique_ptr< Geometry >	MakeFillPath (const flutter::DlPath &path, std::optional< Rect > inner_rect=std::nullopt)

static std::unique_ptr< Geometry >	MakeStrokePath (const flutter::DlPath &path, const StrokeParameters &stroke={})

static std::unique_ptr< Geometry >	MakeCover ()

static std::unique_ptr< Geometry >	MakeRect (const Rect &rect)

static std::unique_ptr< Geometry >	MakeOval (const Rect &rect)

static std::unique_ptr< Geometry >	MakeLine (const Point &p0, const Point &p1, const StrokeParameters &stroke)

static std::unique_ptr< Geometry >	MakeCircle (const Point &center, Scalar radius)

static std::unique_ptr< Geometry >	MakeStrokedCircle (const Point &center, Scalar radius, Scalar stroke_width)

static std::unique_ptr< Geometry >	MakeFilledArc (const Rect &oval_bounds, Degrees start, Degrees sweep, bool include_center)

static std::unique_ptr< Geometry >	MakeStrokedArc (const Rect &oval_bounds, Degrees start, Degrees sweep, const StrokeParameters &stroke)

static std::unique_ptr< Geometry >	MakeRoundRect (const Rect &rect, const Size &radii)

static std::unique_ptr< Geometry >	MakeRoundSuperellipse (const Rect &rect, Scalar corner_radius)

static Scalar	ComputeStrokeAlphaCoverage (const Matrix &entity, Scalar stroke_width)
	Compute an alpha value to simulate lower coverage of fractional pixel strokes.

static GeometryResult	ComputePositionGeometry (const ContentContext &renderer, const Tessellator::VertexGenerator &generator, const Entity &entity, RenderPass &pass)

Detailed Description

An abstract Geometry base class that produces fillable vertices representing the stroked outline of the segments provided by the subclass in the virtual |Dispatch| method.

Definition at line 35 of file stroke_path_geometry.h.

Constructor & Destructor Documentation

◆ ~StrokeSegmentsGeometry()

impeller::StrokeSegmentsGeometry::~StrokeSegmentsGeometry ( )

overridedefault

◆ StrokeSegmentsGeometry()

impeller::StrokeSegmentsGeometry::StrokeSegmentsGeometry ( const StrokeParameters & parameters )

explicitprotected

Definition at line 727 of file stroke_path_geometry.cc.

728 : stroke_(stroke) {}

Member Function Documentation

◆ ComputeAlphaCoverage()

Scalar impeller::StrokeSegmentsGeometry::ComputeAlphaCoverage ( const Matrix & transform ) const

overridevirtual

Reimplemented from impeller::Geometry.

Definition at line 748 of file stroke_path_geometry.cc.

                                   {
  return Geometry::ComputeStrokeAlphaCoverage(transform, stroke_.width);
}

References impeller::Geometry::ComputeStrokeAlphaCoverage(), transform, and impeller::StrokeParameters::width.

◆ Dispatch()

virtual void impeller::StrokeSegmentsGeometry::Dispatch	(	PathAndArcSegmentReceiver &	receiver,
		Tessellator &	tessellator,
		Scalar	scale
	)		const

protectedpure virtual

Dispatch the path segments to the StrokePathSegmentReceiver for the provided transform scale.

Implemented in impeller::StrokePathSourceGeometry, and impeller::ArcStrokeGeometry.

◆ GetMiterLimit()

Scalar impeller::StrokeSegmentsGeometry::GetMiterLimit ( ) const

Definition at line 736 of file stroke_path_geometry.cc.

                                                   {
  return stroke_.miter_limit;
}

References impeller::StrokeParameters::miter_limit.

◆ GetStrokeCap()

Cap impeller::StrokeSegmentsGeometry::GetStrokeCap ( ) const

Definition at line 740 of file stroke_path_geometry.cc.

                                               {
  return stroke_.cap;
}

References impeller::StrokeParameters::cap.

◆ GetStrokeCoverage()

std::optional< Rect > impeller::StrokeSegmentsGeometry::GetStrokeCoverage	(	const Matrix &	transform,
		const Rect &	segment_bounds
	)		const

protected

Provide the stroke-padded bounds for the provided bounds of the segments themselves.

Definition at line 828 of file stroke_path_geometry.cc.

                                   {
  if (path_bounds.IsEmpty()) {
    return std::nullopt;
  }
 
  Scalar max_radius = 0.5;
  if (stroke_.cap == Cap::kSquare) {
    max_radius = max_radius * kSqrt2;
  }
  if (stroke_.join == Join::kMiter) {
    max_radius = std::max(max_radius, stroke_.miter_limit * 0.5f);
  }
  Scalar max_basis = transform.GetMaxBasisLengthXY();
  if (max_basis == 0) {
    return {};
  }
  // Use the most conervative coverage setting.
  Scalar min_size = kMinStrokeSize / max_basis;
  max_radius *= std::max(stroke_.width, min_size);
  return path_bounds.Expand(max_radius).TransformBounds(transform);
}

References impeller::StrokeParameters::cap, impeller::TRect< T >::Expand(), impeller::TRect< T >::IsEmpty(), impeller::StrokeParameters::join, impeller::kMinStrokeSize, impeller::kMiter, impeller::kSqrt2, impeller::kSquare, impeller::StrokeParameters::miter_limit, transform, impeller::TRect< T >::TransformBounds(), and impeller::StrokeParameters::width.

Referenced by impeller::StrokePathSourceGeometry::GetCoverage(), and impeller::ArcStrokeGeometry::GetCoverage().

◆ GetStrokeJoin()

Join impeller::StrokeSegmentsGeometry::GetStrokeJoin ( ) const

Definition at line 744 of file stroke_path_geometry.cc.

                                                 {
  return stroke_.join;
}

References impeller::StrokeParameters::join.

◆ GetStrokeWidth()

Scalar impeller::StrokeSegmentsGeometry::GetStrokeWidth ( ) const

Definition at line 732 of file stroke_path_geometry.cc.

                                                    {
  return stroke_.width;
}

References impeller::StrokeParameters::width.

Friends And Related Symbol Documentation

◆ ImpellerBenchmarkAccessor

friend class ImpellerBenchmarkAccessor

friend

Definition at line 79 of file stroke_path_geometry.h.

◆ ImpellerEntityUnitTestAccessor

friend class ImpellerEntityUnitTestAccessor