impeller::ShadowPathGeometry Class Reference

#include <shadow_path_geometry.h>

Public Member Functions
	ShadowPathGeometry (Tessellator &tessellator, const Matrix &matrix, const PathSource &source, Scalar occluder_height)
bool	CanRender () const
bool	IsEmpty () const
	Returns true if this shadow has no effect, is not visible.
const std::shared_ptr< ShadowVertices > &	GetShadowVertices () const
const std::shared_ptr< ShadowVertices >	TakeShadowVertices ()

Static Public Member Functions
static std::shared_ptr< ShadowVertices >	MakeAmbientShadowVertices (Tessellator &tessellator, const PathSource &source, Scalar occluder_height, const Matrix &matrix)

Detailed Description

A class to compute and return the |ShadowVertices| for a path source viewed under a given transform. The |occluder_height| is measured in device pixels. The geometry of the |PathSource| is transformed by the indicated matrix to produce a device space set of vertices, and the shadow mesh is inset and outset by the indicated |occluder_height| without any adjustment for the matrix. The results are un-transformed and returned back iin the |ShadowVertices| in the original coordinate system.

Definition at line 80 of file shadow_path_geometry.h.

Constructor & Destructor Documentation

ShadowPathGeometry()

impeller::ShadowPathGeometry::ShadowPathGeometry	(	Tessellator &	tessellator,
		const Matrix &	matrix,
		const PathSource &	source,
		Scalar	occluder_height
	)

Definition at line 1389 of file shadow_path_geometry.cc.

    : shadow_vertices_(MakeAmbientShadowVertices(tessellator,
                                                 source,
                                                 occluder_height,
                                                 matrix)) {}

Member Function Documentation

CanRender()

bool impeller::ShadowPathGeometry::CanRender

(

)

const

Definition at line 1398 of file shadow_path_geometry.cc.

                                         {
  return shadow_vertices_ != nullptr;
}

GetShadowVertices()

const std::shared_ptr< ShadowVertices > & impeller::ShadowPathGeometry::GetShadowVertices

(

)

const

Returns a reference to the generated vertices, or null if the algorithm failed to produce a mesh.

Definition at line 1406 of file shadow_path_geometry.cc.

          {
  return shadow_vertices_;
}

IsEmpty()

bool impeller::ShadowPathGeometry::IsEmpty

(

)

const

Returns true if this shadow has no effect, is not visible.

Definition at line 1402 of file shadow_path_geometry.cc.

                                       {
  return shadow_vertices_ != nullptr && shadow_vertices_->IsEmpty();
}

MakeAmbientShadowVertices()

std::shared_ptr< ShadowVertices > impeller::ShadowPathGeometry::MakeAmbientShadowVertices ( Tessellator &  tessellator, const PathSource &  source, Scalar  occluder_height, const Matrix &  matrix  )

static

Constructs a shadow mesh for the given |PathSource| at the given |matrix| and with the indicated device-space |occluder_height|. The tessellator is used to get a cached set of |Trigs| for the radii associated with the mesh around various corners in the path.

Definition at line 1454 of file shadow_path_geometry.cc.

                          {
  Scalar trig_radius = PolygonInfo::GetTrigRadiusForHeight(occluder_height);
  Tessellator::Trigs trigs = tessellator.GetTrigsForDeviceRadius(trig_radius);
 
  PolygonInfo polygon(occluder_height);
 
  return polygon.CalculateConvexShadowMesh(source, matrix, trigs);
}

References impeller::Tessellator::GetTrigsForDeviceRadius().

Referenced by impeller::BM_ShadowPathVerticesImpeller(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), impeller::testing::TEST(), and impeller::testing::TEST().

TakeShadowVertices()

const std::shared_ptr< ShadowVertices > impeller::ShadowPathGeometry::TakeShadowVertices

(

)

Takes (returns the only copy of via std::move) the shadow vertices or null if the algorithm failed to produce a mesh.

Definition at line 1411 of file shadow_path_geometry.cc.

                                                                           {
  return std::move(shadow_vertices_);
}

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

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