impeller::ArcGeometry Class Reference

#include <arc_geometry.h>

Inheritance diagram for impeller::ArcGeometry:

Public Member Functions
	ArcGeometry (const Arc &arc)
	ArcGeometry (const Arc &arc, const StrokeParameters &stroke)
	~ArcGeometry () 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.
bool	IsAxisAlignedRect () const override
Scalar	ComputeAlphaCoverage (const Matrix &transform) const override
Public Member Functions inherited from impeller::Geometry
virtual	~Geometry ()
virtual GeometryResult::Mode	GetResultMode () const
virtual bool	CanApplyMaskFilter () const

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

Definition at line 17 of file arc_geometry.h.

Constructor & Destructor Documentation

ArcGeometry() [1/2]

impeller::ArcGeometry::ArcGeometry ( const Arc &  arc )

explicit

Definition at line 12 of file arc_geometry.cc.

    : arc_(arc), stroke_width_(-1.0f), cap_(Cap::kButt) {}

ArcGeometry() [2/2]

impeller::ArcGeometry::ArcGeometry ( const Arc &  arc, const StrokeParameters &  stroke  )

explicit

Definition at line 15 of file arc_geometry.cc.

    : arc_(arc), stroke_width_(stroke.width), cap_(stroke.cap) {
  FML_DCHECK(arc.IsPerfectCircle());
  FML_DCHECK(!arc.IncludeCenter());
}

References FML_DCHECK, impeller::Arc::IncludeCenter(), and impeller::Arc::IsPerfectCircle().

~ArcGeometry()

impeller::ArcGeometry::~ArcGeometry ( )

overridedefault

Member Function Documentation

ComputeAlphaCoverage()

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

overridevirtual

Reimplemented from impeller::Geometry.

Definition at line 24 of file arc_geometry.cc.

                                                                      {
  if (stroke_width_ < 0) {
    return 1;
  }
  return Geometry::ComputeStrokeAlphaCoverage(transform, stroke_width_);
}

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

CoversArea()

bool impeller::ArcGeometry::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.

Definition at line 80 of file arc_geometry.cc.

                                                                             {
  return false;
}

IsAxisAlignedRect()

bool impeller::ArcGeometry::IsAxisAlignedRect ( ) const

overridevirtual

Reimplemented from impeller::Geometry.

Definition at line 84 of file arc_geometry.cc.

                                          {
  return false;
}

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

• impeller/entity/geometry/arc_geometry.h
• impeller/entity/geometry/arc_geometry.cc