Flutter Impeller
impeller::ArcGeometry Class Referencefinal

#include <arc_geometry.h>

Inheritance diagram for impeller::ArcGeometry:
impeller::Geometry

Public Member Functions

 ArcGeometry (const Arc &arc)
 
 ArcGeometry (const Arc &arc, const StrokeParameters &stroke)
 
 ~ArcGeometry () override
 
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. More...
 
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< GeometryMakeFillPath (const flutter::DlPath &path, std::optional< Rect > inner_rect=std::nullopt)
 
static std::unique_ptr< GeometryMakeStrokePath (const flutter::DlPath &path, const StrokeParameters &stroke={})
 
static std::unique_ptr< GeometryMakeCover ()
 
static std::unique_ptr< GeometryMakeRect (const Rect &rect)
 
static std::unique_ptr< GeometryMakeOval (const Rect &rect)
 
static std::unique_ptr< GeometryMakeLine (const Point &p0, const Point &p1, const StrokeParameters &stroke)
 
static std::unique_ptr< GeometryMakeCircle (const Point &center, Scalar radius)
 
static std::unique_ptr< GeometryMakeStrokedCircle (const Point &center, Scalar radius, Scalar stroke_width)
 
static std::unique_ptr< GeometryMakeFilledArc (const Rect &oval_bounds, Degrees start, Degrees sweep, bool include_center)
 
static std::unique_ptr< GeometryMakeStrokedArc (const Rect &oval_bounds, Degrees start, Degrees sweep, const StrokeParameters &stroke)
 
static std::unique_ptr< GeometryMakeRoundRect (const Rect &rect, const Size &radii)
 
static std::unique_ptr< GeometryMakeRoundSuperellipse (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. More...
 
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 11 of file arc_geometry.cc.

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

References impeller::kButt.

◆ ArcGeometry() [2/2]

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

Definition at line 14 of file arc_geometry.cc.

15  : arc_(arc), stroke_width_(stroke.width), cap_(stroke.cap) {
16  FML_DCHECK(arc.IsPerfectCircle());
17  FML_DCHECK(!arc.IncludeCenter());
18 }

References 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 23 of file arc_geometry.cc.

23  {
24  if (stroke_width_ < 0) {
25  return 1;
26  }
27  return Geometry::ComputeStrokeAlphaCoverage(transform, stroke_width_);
28 }
static Scalar ComputeStrokeAlphaCoverage(const Matrix &entity, Scalar stroke_width)
Compute an alpha value to simulate lower coverage of fractional pixel strokes.
Definition: geometry.cc:149

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

◆ CoversArea()

bool impeller::ArcGeometry::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 75 of file arc_geometry.cc.

75  {
76  return false;
77 }

◆ IsAxisAlignedRect()

bool impeller::ArcGeometry::IsAxisAlignedRect ( ) const
overridevirtual

Reimplemented from impeller::Geometry.

Definition at line 79 of file arc_geometry.cc.

79  {
80  return false;
81 }

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