A geometry that implements "drawPaint" like behavior by covering the entire render pass area. More...

#include <cover_geometry.h>

Inheritance diagram for impeller::CoverGeometry:

Public Member Functions
	CoverGeometry ()

	~CoverGeometry ()=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	CanApplyMaskFilter () const override

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

virtual bool	IsAxisAlignedRect () 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

A geometry that implements "drawPaint" like behavior by covering the entire render pass area.

Definition at line 14 of file cover_geometry.h.

Constructor & Destructor Documentation

◆ CoverGeometry()

impeller::CoverGeometry::CoverGeometry ( )

default

◆ ~CoverGeometry()

impeller::CoverGeometry::~CoverGeometry ( )

default

Member Function Documentation

◆ CanApplyMaskFilter()

bool impeller::CoverGeometry::CanApplyMaskFilter ( ) const

overridevirtual

Reimplemented from impeller::Geometry.

Definition at line 45 of file cover_geometry.cc.

                                             {
  return false;
}

◆ CoversArea()

bool impeller::CoverGeometry::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 40 of file cover_geometry.cc.

                                                       {
  return true;
}

◆ GetCoverage()

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

overrideprivatevirtual

Implements impeller::Geometry.

Definition at line 36 of file cover_geometry.cc.

                                                                          {
  return Rect::MakeMaximum();
}

◆ GetPositionBuffer()

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

overrideprivatevirtual

Implements impeller::Geometry.

Definition at line 13 of file cover_geometry.cc.

                                                                        {
  auto rect = Rect::MakeSize(pass.GetRenderTargetSize());
  constexpr uint16_t kRectIndicies[4] = {0, 1, 2, 3};
  auto& host_buffer = renderer.GetTransientsBuffer();
  return GeometryResult{
      .type = PrimitiveType::kTriangleStrip,
      .vertex_buffer =
          {
              .vertex_buffer = host_buffer.Emplace(
                  rect.GetTransformedPoints(entity.GetTransform().Invert())
                      .data(),
                  8 * sizeof(float), alignof(float)),
              .index_buffer = host_buffer.Emplace(
                  kRectIndicies, 4 * sizeof(uint16_t), alignof(uint16_t)),
              .vertex_count = 4,
              .index_type = IndexType::k16bit,
          },
      .transform = entity.GetShaderTransform(pass),
  };
}

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

impeller/entity/geometry/cover_geometry.h
impeller/entity/geometry/cover_geometry.cc

Public Member Functions

Private Member Functions

Additional Inherited Members