#include <circle_geometry.h>

Inheritance diagram for impeller::CircleGeometry:

Public Member Functions
	CircleGeometry (const Point &center, Scalar radius)

	CircleGeometry (const Point &center, Scalar radius, Scalar stroke_width)

	~CircleGeometry ()=default

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

bool	IsAxisAlignedRect () const override

Public Member Functions inherited from impeller::Geometry
virtual GeometryResult::Mode	GetResultMode () const

virtual bool	CanApplyMaskFilter () const

Private Member Functions
GeometryResult	GetPositionBuffer (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override

std::optional< Rect >	GetCoverage (const Matrix &transform) const override

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

static std::shared_ptr< Geometry >	MakeStrokePath (const Path &path, Scalar stroke_width=0.0, Scalar miter_limit=4.0, Cap stroke_cap=Cap::kButt, Join stroke_join=Join::kMiter)

static std::shared_ptr< Geometry >	MakeCover ()

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

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

static std::shared_ptr< Geometry >	MakeLine (const Point &p0, const Point &p1, Scalar width, Cap cap)

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

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

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

static std::shared_ptr< Geometry >	MakePointField (std::vector< Point > points, Scalar radius, bool round)

Static Protected Member Functions inherited from impeller::Geometry
static GeometryResult	ComputePositionGeometry (const ContentContext &renderer, const Tessellator::VertexGenerator &generator, const Entity &entity, RenderPass &pass)

Detailed Description

Definition at line 14 of file circle_geometry.h.

Constructor & Destructor Documentation

◆ CircleGeometry() [1/2]

impeller::CircleGeometry::CircleGeometry	(	const Point &	center,
		Scalar	radius
	)

explicit

Definition at line 13 of file circle_geometry.cc.

    : center_(center), radius_(radius), stroke_width_(-1.0f) {
  FML_DCHECK(radius >= 0);
}

◆ CircleGeometry() [2/2]

impeller::CircleGeometry::CircleGeometry	(	const Point &	center,
		Scalar	radius,
		Scalar	stroke_width
	)

explicit

Definition at line 18 of file circle_geometry.cc.

    : center_(center),
      radius_(radius),
      stroke_width_(std::max(stroke_width, 0.0f)) {
  FML_DCHECK(radius >= 0);
  FML_DCHECK(stroke_width >= 0);
}

◆ ~CircleGeometry()

impeller::CircleGeometry::~CircleGeometry ( )

default

Member Function Documentation

◆ CoversArea()

bool impeller::CircleGeometry::CoversArea	(	const Matrix &	transform,
		const Rect &	rect
	)		const

overridevirtual

Determines if this geometry, transformed by the given transform, will completely cover all surface area of the given rect.

This is a conservative estimate useful for certain optimizations.

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

Reimplemented from impeller::Geometry.

Definition at line 61 of file circle_geometry.cc.

                                                        {
  return false;
}

◆ GetCoverage()

std::optional< Rect > impeller::CircleGeometry::GetCoverage ( const Matrix & transform ) const

overrideprivatevirtual

Implements impeller::Geometry.

Definition at line 47 of file circle_geometry.cc.

                                                                           {
  Point corners[4]{
      {center_.x, center_.y - radius_},
      {center_.x + radius_, center_.y},
      {center_.x, center_.y + radius_},
      {center_.x - radius_, center_.y},
  };
 
  for (int i = 0; i < 4; i++) {
    corners[i] = transform * corners[i];
  }
  return Rect::MakePointBounds(std::begin(corners), std::end(corners));
}

◆ GetPositionBuffer()

GeometryResult impeller::CircleGeometry::GetPositionBuffer	(	const ContentContext &	renderer,
		const Entity &	entity,
		RenderPass &	pass
	)		const

overrideprivatevirtual

Implements impeller::Geometry.

Definition at line 28 of file circle_geometry.cc.

                                                                         {
  auto& transform = entity.GetTransform();
 
  Scalar half_width = stroke_width_ < 0 ? 0.0
                                        : LineGeometry::ComputePixelHalfWidth(
                                              transform, stroke_width_);
 
  std::shared_ptr<Tessellator> tessellator = renderer.GetTessellator();
 
  // We call the StrokedCircle method which will simplify to a
  // FilledCircleGenerator if the inner_radius is <= 0.
  auto generator =
      tessellator->StrokedCircle(transform, center_, radius_, half_width);
 
  return ComputePositionGeometry(renderer, generator, entity, pass);
}

◆ IsAxisAlignedRect()

bool impeller::CircleGeometry::IsAxisAlignedRect ( ) const