impeller::RectGeometry Class Reference

#include <rect_geometry.h>

Inheritance diagram for impeller::RectGeometry:

Public Member Functions
	RectGeometry (Rect rect)
	~RectGeometry ()=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. More...
bool	IsAxisAlignedRect () const override
GeometryResult	GetPositionBuffer (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
std::optional< Rect >	GetCoverage (const Matrix &transform) const override
Public Member Functions inherited from impeller::Geometry
virtual GeometryResult::Mode	GetResultMode () const
virtual bool	CanApplyMaskFilter () const
virtual Scalar	ComputeAlphaCoverage (const Entity &entitys) const

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 12 of file rect_geometry.h.

Constructor & Destructor Documentation

RectGeometry()

impeller::RectGeometry::RectGeometry ( Rect  rect )

explicit

Definition at line 9 of file rect_geometry.cc.

: rect_(rect) {}

~RectGeometry()

impeller::RectGeometry::~RectGeometry ( )

default

Member Function Documentation

CoversArea()

bool impeller::RectGeometry::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 32 of file rect_geometry.cc.

                                                                             {
  if (!transform.IsTranslationScaleOnly()) {
    return false;
  }
  Rect coverage = rect_.TransformBounds(transform);
  return coverage.Contains(rect);
}

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

GetCoverage()

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

overridevirtual

Implements impeller::Geometry.

Definition at line 28 of file rect_geometry.cc.

                                                                         {
  return rect_.TransformBounds(transform);
}

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

GetPositionBuffer()

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

overridevirtual

Implements impeller::Geometry.

Definition at line 11 of file rect_geometry.cc.

                                                                       {
  auto& host_buffer = renderer.GetTransientsBuffer();
  return GeometryResult{
      .type = PrimitiveType::kTriangleStrip,
      .vertex_buffer =
          {
              .vertex_buffer = host_buffer.Emplace(
                  rect_.GetPoints().data(), 8 * sizeof(float), alignof(float)),
              .vertex_count = 4,
              .index_type = IndexType::kNone,
          },
      .transform = entity.GetShaderTransform(pass),
  };
}

References impeller::TRect< T >::GetPoints(), impeller::Entity::GetShaderTransform(), impeller::ContentContext::GetTransientsBuffer(), impeller::kNone, impeller::kTriangleStrip, and impeller::GeometryResult::type.

IsAxisAlignedRect()

bool impeller::RectGeometry::IsAxisAlignedRect ( ) const

overridevirtual

Reimplemented from impeller::Geometry.

Definition at line 40 of file rect_geometry.cc.

                                           {
  return true;
}

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

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