An abstract Geometry base class that produces fillable vertices for the interior of any |PathSource| provided by the type-specific subclass. More...

#include <fill_path_geometry.h>

Inheritance diagram for impeller::FillPathSourceGeometry:

Public Member Functions
	~FillPathSourceGeometry () override

bool	CoversArea (const Matrix &transform, const IRect &rect) const override
	Determines if this geometry, transformed by the given `transform`, will completely cover all of the pixels within the given integer `rect`.

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

virtual bool	IsAxisAlignedRect () const

virtual bool	CanApplyMaskFilter () const

virtual Scalar	ComputeAlphaCoverage (const Matrix &transform) const

Protected Member Functions
	FillPathSourceGeometry (std::optional< Rect > inner_rect)

virtual const PathSource &	GetSource () const =0

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 for the interior of any |PathSource| provided by the type-specific subclass.

Definition at line 19 of file fill_path_geometry.h.

Constructor & Destructor Documentation

◆ ~FillPathSourceGeometry()

impeller::FillPathSourceGeometry::~FillPathSourceGeometry ( )

override

Definition at line 18 of file fill_path_geometry.cc.

18{}

◆ FillPathSourceGeometry()

impeller::FillPathSourceGeometry::FillPathSourceGeometry ( std::optional< Rect > inner_rect )

explicitprotected

Definition at line 15 of file fill_path_geometry.cc.

16 : inner_rect_(inner_rect) {}

Member Function Documentation

◆ CoversArea()

bool impeller::FillPathSourceGeometry::CoversArea	(	const Matrix &	transform,
		const IRect &	rect
	)		const

overridevirtual

Determines if this geometry, transformed by the given transform, will completely cover all of the pixels within the given integer rect.

The integer rect, by definition, will contain all of the area covered by any pixel within its boundary.

The return value can be a conservative estimate which will still be useful for certain optimizations. It may return false for obscure cases that might actually contain all of the pixels if it is too computationally costly to prove containment, but it should never return 'true' unless the implementation can prove that all pixels are fully covered (rendered) by the geometry.

Returns: true if the transformed geometry is guaranteed to cover the given rect. May return false in some cases where the transformed geometry does in fact cover the rect.

Reimplemented from impeller::Geometry.

Reimplemented in impeller::FillRoundRectGeometry.

Definition at line 83 of file fill_path_geometry.cc.

                                                                 {
  if (!inner_rect_.has_value()) {
    return false;
  }
  if (!transform.IsTranslationScaleOnly()) {
    return false;
  }
  Rect coverage = inner_rect_->TransformBounds(transform);
  return coverage.Contains(rect);
}

References impeller::TRect< T >::Contains(), and transform.

◆ GetSource()

virtual const PathSource & impeller::FillPathSourceGeometry::GetSource ( ) const

protectedpure virtual

The PathSource object that will be iterated to produce the filled vertices.

Implemented in impeller::FillPathFromSourceGeometry, impeller::FillPathGeometry, impeller::FillDiffRoundRectGeometry, and impeller::FillRoundRectGeometry.

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

impeller/entity/geometry/fill_path_geometry.h
impeller/entity/geometry/fill_path_geometry.cc

Public Member Functions

Protected Member Functions